JP7724700B2 - Valve equipment and parts replacement jigs - Google Patents

Description

The present invention relates to a valve device comprising a valve element and a housing that accommodates the valve element so that it can rotate around a predetermined axis, and to a part replacement jig for the valve device.

Valve devices for opening, closing, and switching flow paths through which a flow object passes have been known for some time (see Patent Document 1). As shown in Figure 21, this valve device 600 comprises a valve element 601 having a flow passage R11 formed therein that passes on an imaginary plane perpendicular or nearly perpendicular to an axis L extending in a predetermined direction; a housing 603 having a valve element accommodating chamber 602 that accommodates the valve element 601 and having two main passages R12, R13 that can communicate with each other via the flow passage R11 of the valve element 601 within the valve element accommodating chamber 602; and an annular seat member 604 arranged around the opening of the main passage R12 within the housing 603.

The valve device 600 also includes a first stem 605 that is connected to one end of the valve element 601 in the direction of the axis L while being inserted through the housing 603 so as to pass through the axis L, and rotates the valve element 601 around the axis L; and a second stem 606 that is inserted through the housing 603 from the opposite side to the first stem 605 so as to pass through the axis L, and engages with the other end of the valve element 601 in the direction of the axis L, and is capable of tilting the valve element 601 toward the seat member 604.

In this valve device 600, by rotating the first stem 605 around the axis L without tilting the valve body 601 toward the seat member 604, the valve body 601 rotates around the axis L without contacting the seat member 604.

Then, by rotating the second stem 606 around the axis L with the non-penetrating portion (valve main body) 601a of the valve element 601 facing the main passage R12, the valve element 601 tilts toward the seat member 604, with one end in the direction of the axis L (the connection portion with the first stem 605: the right end in Figure 21) as a fulcrum, causing the valve main body 601a to press against the seat member 604 and blocking the main passage R12.

With the above-described valve device 600, the valve disc 601 does not come into contact with the seat member 604 when it is rotated, minimizing wear on the seat member 604 and enabling proper sealing between the valve disc 601 and the housing 603 for a longer period of time than with a typical ball valve.

JP 2014-62625 A

In the above-described valve device 600, the valve element 601 has a recess 607 at its other end in the direction of axis L, into which the second stem 606 can be inserted. The inner surface of this recess 607 is provided with a pressing surface S10 that is pressed against the cam surface 608 of the second stem 606 when the second stem 606 rotates about the axis L with the valve main body 601a facing the main passage R12. When the second stem 606 rotates about the axis L with the valve main body 601a facing the main passage R12, the cam surface 608 presses against the pressing surface S10, causing the valve element 601 to tilt and press the valve main body 601a against the seat member 604.

At this time, the inner surface of the recess 607 (such as the pressing surface S10) wears due to sliding against the cam surface 608 of the second stem 606. Therefore, in order to ensure sufficient sealing between the valve body 601 and the seat member 604 when the valve body 601 tilts, the recess 607 must be replaced after each specified number of operations in the valve device 600 or at specified intervals.

However, since the recess 607 must be removed from the valve body 601 by moving it toward the second stem 606 in the direction of the axis L relative to the valve body 601, replacing the recess 607 in the above-mentioned valve device 600 requires removing the piping connected to the main passages R12 and R13, disassembling the housing 603 to remove the second stem 606 from the recess 607, and then removing the recess 607 from the valve body 601, which is extremely cumbersome.

The present invention aims to provide a valve device that is easy to maintain when the engagement portion between the valve disc and the stem that tilts the valve disc becomes worn, as well as a jig for replacing parts of the valve device.

The valve device of the present invention comprises:
a valve body that is rotatably disposed about a predetermined axis and has a flow passage that passes through an imaginary plane perpendicular or substantially perpendicular to the axis;
a housing having a valve element accommodating chamber for accommodating the valve element, and at least two main passages that can communicate with each other through the flow passage of the valve element in the valve element accommodating chamber;
an annular seat member disposed around an opening that opens toward the valve body accommodating chamber at a position corresponding to one of the at least two main passages in the housing;
a first stem that is engaged with a first portion that is one end of the valve body in the axial direction while being inserted through the housing so as to pass through the axis, and that rotates the valve body around the axis;
a second stem that is inserted through the housing from the opposite side to the first stem so as to pass through the axis and engages with a second portion that is the other end of the valve body in the axial direction, and is capable of tilting the valve body toward the seat member,
the valve element has the first portion, the second portion disposed at a position sandwiching the flow passage between the first portion and the second portion in the axial direction, and a valve main body portion connecting the first portion and the second portion and abutting against the seat member by the tilting of the valve element,
the second section includes a recess having an inner surface defining a space into which the end of the second stem is inserted, and a second section body to which the recess is removably fixed and which is connected to the valve body,
the second portion main body is configured so that the recess can be attached and detached from the flow path side,
The second stem tilts the valve body by sliding the end portion against the inner surface of the recess.

This configuration facilitates maintenance when the engagement portion between the valve disc and the second stem that tilts the valve disc becomes worn due to sliding of the second stem. In other words, because the second-part main body is configured so that the recess can be attached and detached from the flow passage side, as in the above configuration, the recess can be attached and detached from the second-part main body while the valve disc remains positioned in the valve disc accommodating chamber, making it possible to replace the recess without disassembling the housing and removing the valve disc.

In the valve device,
the housing has an opening that allows communication between the outside of the housing and the flow path, and a lid that releasably closes the opening,
The opening may be larger than the recess.

With this configuration, the opening can be opened to allow access to the flow passage from outside the housing, making it easier to replace the recess.

Further, the part replacement jig of the present invention is
a part replacement jig used when replacing the recessed portion in any of the valve devices described above, the axis of which is arranged so as to intersect with a vertical direction,
a base portion that can be removably placed in the valve body accommodating chamber at a position below the valve body;
The valve body further includes a support portion that extends upward from the base and supports the valve body when the base is disposed in the valve body accommodating chamber.

When the valve device is positioned so that its axis intersects the vertical direction, gravity places a vertical load (a direction intersecting the axial direction) on the engagement point between the second stem and the valve body. This increases friction between the end of the second stem and the inner surface of the recess, making it difficult to attach or detach the recess from the second part body. However, when the valve body is supported from below by the parts replacement jig, this load is eliminated or reduced, making it easier to attach or detach the recess from the second part body.

In the part replacement jig,
The support portion may have a receiving portion that abuts against the valve body from below the valve body, and a distance adjusting portion that can change the distance between the receiving portion and the base portion.

With this configuration, the distance between the receiving portion and the base can be changed using the distance adjustment portion. This makes it possible to more effectively reduce the load that occurs at the engagement portion between the end of the second stem and the recess in the valve body when the valve body is supported by a parts replacement jig in the valve body accommodating chamber, thereby making it easier to replace the recess.

Further, in the part replacement jig,
the receiving portion has a first receiving portion that abuts against the first portion of the valve body and a second receiving portion that abuts against the second portion of the valve body,
The gap adjustment portion may include a first gap adjustment portion capable of adjusting the gap between the first receiving portion and the base portion, and a second gap adjustment portion capable of adjusting the gap between the second receiving portion and the base portion.

With this configuration, the distance between the base and the first and second sections of the valve body, which are spaced apart in the axial direction, can be adjusted (changed) separately, which more effectively reduces the load that occurs at the engagement between the end of the second stem and the recess in the valve body, making it easier to replace the recess.

Further, in the part replacement jig,
The base may be disposed in the valve body accommodating chamber to divide the valve body accommodating chamber into an upper region in which the valve body is disposed and a lower region in which the valve body is not disposed.

With this configuration, the valve body accommodating chamber is divided into an upper region and a lower region by the base, preventing parts from falling into the lower region of the valve body accommodating chamber (the region below the base) when attaching or detaching the recess to the second part main body.

As described above, the present invention provides a valve device that is easy to maintain when the engagement portion between the valve disc and the stem that tilts the valve disc becomes worn, as well as a part replacement jig for the valve device.

FIG. 1 is a vertical cross-sectional view of a valve device according to this embodiment, in which a valve body portion of a valve element faces a first main passage. FIG. 2 is a vertical cross-sectional view of the valve device, showing a state in which the valve body portion of the valve element faces an opening. FIG. 3 is a partial cross-sectional view including a cross section of the housing as seen from the first main passage side, showing a state in which a lid portion is attached to close the opening portion. FIG. 4 is a partial cross-sectional view including a cross section of the housing as seen from the first main passage side, with the lid portion removed to expose the opening. FIG. 5 is a partially enlarged cross-sectional view of the valve body and its surroundings, in which a second portion of the valve body is disassembled. FIG. 6 is an enlarged view of the position VI in FIG. FIG. 7 is an enlarged view of the pressing member as viewed from the X-axis direction. FIG. 8 is an enlarged view of the second stem engaging portion as viewed from the second stem side in the X-axis direction. FIG. 9 is an enlarged view of the second stem engaging portion as viewed from the first main passage side in the Z-axis direction. FIG. 10 is an enlarged view of the second stem engaging portion as viewed from the flow passage side in the X-axis direction. FIG. 11 is a front view of the part replacement jig. FIG. 12 is a plan view of the part replacement jig. FIG. 13 is a plan view of a base portion of the component replacement jig. FIG. 14 is a cross-sectional view taken along line XIV-XIV in FIG. FIG. 15 is an exploded perspective view of a support portion provided in the component replacement jig, showing the cross-sectional shape of a portion of the configuration. FIG. 16 is a view showing a state in which the base portion is disposed in the valve body accommodating chamber. FIG. 17 is a view showing a state in which a support portion is attached to the base portion disposed in the valve body accommodating chamber. FIG. 18 is a view showing a state in which the part replacement jig placed in the valve body accommodating chamber supports the valve body. FIG. 19 is a view showing a state in which the connecting member and the pressing member are removed from the valve body supported by the part replacement shaft arranged in the valve body accommodating chamber. FIG. 20 is a diagram showing a state in which the second stem engagement portion, key plate, and dust seal have been removed from the valve body supported by the part replacement shaft arranged in the valve body accommodating chamber. FIG. 21 is a vertical cross-sectional view of a conventional valve device.

One embodiment of the present invention will be described below with reference to Figures 1 to 20.

As shown in Figures 1 to 4, the valve device 1 of this embodiment comprises a valve element 2 having a flow passage F, and a housing 3 having an internal valve element accommodating chamber VR that accommodates the valve element 2 rotatably about an axis L extending in a predetermined direction (the left-right direction in Figure 1). This valve device 1 is a so-called two-way valve, and the housing 3 is formed with a first main passage R1 and a second main passage R2 that connect the valve element accommodating chamber VR to the outside of the housing 3. In the housing 3 of this embodiment, the first main passage R1 and the second main passage R2 extend perpendicular to the axis L and away from each other (the up-down direction in Figure 1) on both sides of the valve element accommodating chamber VR. The valve device 1 also comprises an annular seat member 4 disposed within the housing 3, and first and second stems 8 and 9 that pass through the housing 3 so as to pass through the axis L and support the valve element 2 within the valve element accommodating chamber VR. In the following description, the direction in which the axis L extends is referred to as the X-axis direction, the direction in which the first main passage R1 and the second main passage R2 extend is referred to as the Z-axis direction, and the direction perpendicular to each of the X-axis direction and the Z-axis direction is referred to as the Y-axis direction.

The valve element 2 is disposed within the valve element housing chamber VR so that it can rotate about axis L and tilt around one end in the X-axis direction (the direction in which axis L extends). By rotating about axis L, the valve element 2 closes the first main passage R1 in an open state (a state in which the valve element housing chamber VR is connected to the outside) or opens the first main passage R1 in a closed state. In this embodiment, the valve element 2 is supported within the valve element housing chamber VR at one end in the X-axis direction (the right end in FIG. 1) by a first stem 8 so that it can tilt, and at the other end in the X-axis direction (the left end in FIG. 1) by a second stem 9. The valve element 2 rotates around axis L as the first stem 8 rotates.

The valve disc 2 also has a flow passage F that runs on an imaginary plane perpendicular or nearly perpendicular to the axis L. This flow passage F connects the first main passage R1 and the second main passage R2 when the valve disc 2 is in a predetermined position around the axis L (for example, the position shown in Figure 2). In this embodiment, the flow passage F extends inside the valve disc 2 in a direction perpendicular to the axis L, and is formed (defined) so as to open at least at both ends of the valve disc 2 in the direction perpendicular to the axis L.

Specifically, the valve element 2 has a first portion 21 that forms one end of the valve element 2 in the X-axis direction; a second portion 22 that is positioned at a distance from the first portion 21 in the X-axis direction and forms the other end of the valve element 2 in the X-axis direction; and a valve body portion 23 that connects the first portion 21 and the second portion 22 at a distance from the axis L and is capable of closing the first main passage R1. The valve element 2 is rotatable around the axis L within the valve element accommodating chamber VR. As the valve element 2 rotates, the valve body portion 23 moves on a circular orbit centered on the axis L, along the inner surface IS that defines the valve element accommodating chamber VR in the housing 3. When the valve element 2 is in a predetermined position around the axis L (i.e., a position where the valve body portion 23 faces the first main passage R1), it tilts, pressing the valve body portion 23 against the seat member 4, thereby closing the first main passage R1. More details are provided below.

The first portion 21 has a first stem engagement portion 211 that engages with the first stem 8, and extends in a direction perpendicular to the X-axis direction.

The first stem engagement portion 211 is a portion (concave surface) recessed toward the second portion 22 in the X-axis direction at a portion of the surface of the first portion 21 facing the inner surface IS of the housing 3 that intersects with the axis L, and into which the end of the first stem 8 is inserted. The inner circumferential surface 212 (surface surrounding the axis L) of this first stem engagement portion 211 is configured to transmit rotational torque about the axis L when the first stem 8 rotates about the axis L.

As shown in Figure 5, the second region 22 has a second stem engagement portion (recess) 5 that engages with the second stem 9, and is a region that extends in a direction perpendicular to the X-axis direction at a position spaced apart from the first region 21 in the X-axis direction. A flow passage F is formed between the first region 21 and the second region 22.

Specifically, the second part 22 has a second stem engagement portion (recess) 5 and a second part main body 220 to which the second stem engagement portion 5 is removably fixed and which is connected to the valve main body 23. The second part 22 also has a pressing member 6 that fixes the second stem engagement portion 5 to the second part main body 220, multiple connecting members B that connect the second stem engagement portion 5 and the pressing member 6, and a dust seal 7 that seals between the second stem engagement portion 5 and the second part main body 220. The second part 22 also has at least one key plate K that prevents relative rotation about the axis L between the second part main body 220 and the second stem engagement portion 5.

The second part body 220 holds the second stem engagement portion 5 so that it surrounds it when viewed from the X-axis direction. This second part body 220 is configured so that the second stem engagement portion 5 can be attached and detached from the flow passage F side. Specifically, the second part body 220 extends in a direction perpendicular to the X-axis direction, and has a holding portion 221 that extends through the second part body 220 in the X-axis direction and into which the second stem engagement portion 5 fits, at a position that intersects with the axis L.

As shown in FIG. 6 , the retaining portion 221 includes, in order from the outside of the valve body 2 in the X-axis direction (the surface side facing the inner surface IS of the housing 3; hereinafter also referred to as the "outside in the X-axis direction") to the inside of the valve body 2 in the X-axis direction (the flow passage F side; hereinafter also referred to as the "inside in the X-axis direction"), a restricting portion 224, a seal arrangement portion 223, a retaining portion main body 222, and a pressing member arrangement portion 225.

The retaining body 222 is the portion into which the second stem engagement portion 5 is inserted (fitted). This retaining body 222 has a cylindrical inner circumferential surface 222a that circumferentially surrounds the axis L and extends in the X-axis direction. The inner diameter and dimension in the X-axis direction of the retaining body 222 correspond to the outer diameter and dimension in the X-axis direction of the second stem engagement portion 5. In this embodiment, the retaining body 222 has multiple key grooves 222k on the inner circumferential surface 222a that are spaced apart circumferentially. Each of these multiple key grooves 222k is recessed radially outward of the retaining body 222 and extends from the inner end of the retaining body 222 in the X-axis direction toward the outside in the X-axis direction. In this embodiment, the retaining body 222 has four key grooves 222k that are equally spaced apart circumferentially.

The seal placement section 223 is the section where the dust seal 7 is placed, and is connected to the outer end of the holder main body 222 in the X-axis direction. This seal placement section 223 is concentric with the holder main body 222 and has a reduced diameter (small inner diameter).

The restricting portion 224 restricts the outward movement of the second stem engaging portion 5 in the X-axis direction, and is connected to the outside of the seal arrangement portion 223 in the X-axis direction. When the second stem engaging portion 5 is inserted into the holder main body 222 from the flow passage F side toward the outside in the X-axis direction, the second stem engaging portion 5 abuts against the restricting portion 224 via the dust seal 7, thereby preventing the second stem engaging portion 5 from further outward movement in the X-axis direction. Specifically, the restricting portion 224 is a portion that is concentric with the seal arrangement portion 223 and has a reduced diameter (small inner diameter).

The pressing member placement section 225 is the section where the pressing member 6 is placed, and is connected to the inner end of the holding section main body 222 in the X-axis direction. This pressing member placement section 225 is a section that is concentric with the holding section main body 222 and has an expanded diameter (large inner diameter).

The dimension of the pressing member arrangement portion 225 in the X-axis direction is set so that, with the pressing member 6 arranged, the surface of the second section main body 220 facing the flow path F and the surface of the pressing member 6 facing the flow path F are at the same or approximately the same position in the X-axis direction. This pressing member arrangement portion 225 has a female thread 225a on its inner circumferential surface (the surface surrounding the axis L).

The second stem engagement portion 5 has a concave surface (inner surface) 55 that defines a space into which the end of the second stem 9 is inserted. This second stem engagement portion 5 is removably fixed to the second part main body 220 while fitted into the retaining portion 221 (more specifically, the retaining portion main body 222). Specifically, as also shown in Figures 7 to 9, the second stem engagement portion 5 has a cylindrical engagement portion main body 50, a first convex portion 51 that protrudes outward in the X-axis direction from the engagement portion main body 50, and a second convex portion 52 that protrudes inward in the X-axis direction from the engagement portion main body 50.

The engagement body 50 is a cylindrical portion centered on the axis L, and the outer diameter of the engagement body 50 is the same as or slightly smaller than the inner diameter of the holding body 222. Furthermore, the dimension of the engagement body 50 in the X-axis direction is the same as the dimension of the holding body 222 in the X-axis direction.

This engagement body 50 has multiple key grooves 50k spaced apart circumferentially on the peripheral surface 50a. The engagement body 50 also has multiple screw holes 50n extending outward in the X-axis direction on the peripheral edge of the surface 50b facing inward in the X-axis direction.

Each of the multiple key grooves 50k extends from the inner end of the circumferential surface 50a in the X-axis direction toward the outer side in the X-axis direction, and is positioned opposite the multiple key grooves 222k of the retaining portion main body 222 in the second section main body 220. These opposing key grooves 50k of the engaging portion main body 50 and key grooves 222k of the retaining portion main body 222 form a hole extending in the X-axis direction.

The multiple screw holes 50n are spaced apart in the circumferential direction. In this embodiment, the multiple screw holes 50n are spaced apart in the circumferential direction, surrounding the second protrusion 52.

The first convex portion 51 is a portion that fits into the area surrounded by the restricting portion 224 of the holding portion 221. In this embodiment, the first convex portion 51 has a circular outline when viewed from the X-axis direction, and the outer diameter of the first convex portion 51 is the same as or slightly smaller than the inner diameter of the restricting portion 224.

The second protrusion 52 is a portion that fits into the pressing member 6. In this embodiment, the second protrusion 52 is a protrusion with a circular outline when viewed from the X-axis direction, and has a groove 521 extending circumferentially on its peripheral surface.

In the second stem engagement part 5 having the engagement part main body 50, first convex part 51, and second convex part 52 described above, the concave surface 55 is recessed inward in the X-axis direction from the surface 51a facing outward in the X-axis direction. The end of the second stem 9 is inserted into this concave surface 55. The concave surface 55 of the second stem engagement part 5 engages with the second stem 9 so that a force is applied from the second stem 9 in a direction intersecting the axis L when the second stem 9 rotates around the axis L.

Specifically, the concave surface 55 has an inner peripheral surface 551 that surrounds the axis L and a bottom surface 552 that is perpendicular to the axis L.

The inner peripheral surface 551 includes a first pressing surface S1 and a second pressing surface S2 that are pressed against a portion 90 of the peripheral surface of the second stem 9 when the second stem 9 rotates about the axis L with the valve body 23 facing the first main passage R1.

Specifically, the inner circumferential surface 551 has a rectangular shape with four corners that protrude in an arc shape when viewed from the X-axis direction. When the valve body 23 faces the first main passage R1, the first pressing surface S1 of this inner circumferential surface 551 is the surface facing the first main passage R1, and the second pressing surface S2 is the surface facing the second main passage R2. The bottom surface 552 extends in a direction perpendicular to the X-axis direction and has a cylindrical bottom surface protrusion 553 that protrudes from a position intersecting the axis L. This bottom surface 552 is located closer to the second protrusion 52 than the center of the engagement body 50 in the X-axis direction (in this embodiment, near the boundary between the engagement body 50 and the second protrusion 52).

The concave surface 55 configured in this manner is positioned such that, when viewed from the X-axis direction, the midpoint C between the first pressing surface S1 and the second pressing surface S2 is offset from the axis L. Specifically, on the inner peripheral surface 551 that is rectangular when viewed from the X-axis direction, the surface that forms the side closest to the axis L forms the first pressing surface S1, and the surface that forms the side farthest from the axis L forms the second pressing surface S2.

As shown in Figure 10, the pressing member 6 is an annular member that straddles the engagement portion main body 50 and the pressing member arrangement portion 225, engages with the second portion main body 220 (more specifically, the pressing member arrangement portion 225), and is connected to the engagement portion main body 50. In this embodiment, the pressing member 6 is plate-shaped with its thickness oriented in the X-axis direction.

The outer diameter of this pressing member 6 corresponds to the inner diameter of the pressing member arrangement portion 225 of the holding portion 221, and it has a male thread 6a on its outer surface. This male thread 6a screws into the female thread 225a on the inner surface of the pressing member arrangement portion 225. The inner diameter of the pressing member 6 corresponds to the outer diameter of the second convex portion 52 of the second stem engagement portion 5, and the second convex portion 52 fits into the area surrounded by the annular pressing member 6.

The retaining member 6 also has multiple through-holes 61 that penetrate in the X-axis direction at positions corresponding to the screw holes 50n of the engagement body 50. That is, the multiple through-holes 61 are spaced apart in the circumferential direction (equally spaced apart in this embodiment).

The connecting member B is a member that connects the retaining member 6 to the second stem engagement portion 5 (more specifically, the engagement portion main body 50), and in this embodiment, the connecting member B is a screw. Each connecting member B is inserted through the through hole 61 of the retaining member 6 and threadedly engages with the screw hole 50n of the engagement portion main body 50.

The dust seal 7 is a member that seals the gap between the retaining portion 221 of the second portion main body 220 and the second stem engagement portion 5. This dust seal 7 is annular and is disposed between the seal placement portion 223 of the retaining portion 221 and the engagement portion main body 50 and first protrusion 51 of the second stem engagement portion 5.

At least one key plate K is a thin plate-shaped member extending in the X-axis direction, and is inserted into a hole formed by the opposing key grooves 50k of the engagement portion body 50 and 222k of the holding portion body 222, thereby preventing relative rotation around the axis L between the second portion body 220 and the second stem engagement portion 5. In this embodiment, the second portion 22 has multiple key plates K.

The valve body 23 connects the first section 21 and the second section 22 at a position spaced apart from the axis L in a direction perpendicular to the axis L, and faces the first main passage R1 when the valve element 2 is in a predetermined position around the axis L (the position shown in FIG. 1). In this embodiment, the valve body 23 connects corresponding ends of the first section 21 and the second section 22 (specifically, those facing each other in the X-axis direction). That is, in the valve element 2, the first section 21, the second section 22, and the valve body 23 are arranged in a U-shape (see FIG. 1). In the valve element 2, the inner space of this U-shape (i.e., the area defined by the first section 21, the second section 22, and the valve body 23) forms the flow passage F.

When facing the first main passage R1, the valve body 23 is configured to face the area including the first main passage R1 and its surrounding area, and has a seal member 231 positioned opposite the surrounding area of the first main passage R1 (seat member 4).

The housing 3 has at least two main passages R that can communicate with each other through the flow passage F of the valve element 2. As described above, the valve device 1 according to this embodiment is a two-way valve, and the housing 3 has two main passages (a first main passage R1 and a second main passage R2) that can communicate with each other through the flow passage F of the valve element 2 accommodated in the valve element accommodating chamber VR. The housing 3 has a housing main body 30 that defines the valve element accommodating chamber VR, an opening 31 that communicates between the outside of the housing main body 30 and the valve element accommodating chamber VR, a lid portion 32 that releasably closes the opening 31, a first flow passage forming portion 33 that defines the first main passage R1, and a second flow passage forming portion 34 that defines the second main passage R2.

In this embodiment, the housing 3 has, for example, a main frame 35 and a sub-frame 36 connected to the main frame 35.

The main frame 35 has a main body 350 that has an internal space capable of accommodating the valve disc 2 and is open at one end in the Z-axis direction, and a main flange 351 that is connected to one end (open end) of the main body 350 in the Z-axis direction. The internal space of this main body 350 communicates with the outside through the opening and constitutes at least a part of the valve disc accommodating chamber VR of the housing 3.

The main frame 35 also has a second flow path forming portion 34 extending in the Z-axis direction from the other end of the main body portion 350 in the Z-axis direction, a first stem insertion portion 352 arranged at one end of the main body portion 350 in the X-axis direction, and a second stem insertion portion 353 arranged at the other end of the main body portion 350 in the X-axis direction. The main frame 35 of this embodiment has an opening 31 arranged in the main body portion 350 and a lid portion 32 that releasably closes the opening 31.

The main flange portion 351 is the portion to which the subframe 36 is connected, and extends from the open end of the main body portion 350 outward in a plane direction perpendicular to the Z-axis direction.

The second flow path forming portion 34 is cylindrical and extends from the main body portion 350 to the other side in the Z-axis direction, defining the second main passage R2. The second main passage R2 defined by the second flow path forming portion 34 is in communication with the internal space of the main body portion 350. The second flow path forming portion 34 also has a flange 34a that extends radially from its tip. This flange 34a is used to connect piping P1, etc., when installing the valve device 1.

The first stem insertion portion 352 is the portion of the housing 3 through which the first stem 8 is inserted, and the second stem insertion portion 353 is the portion of the housing 3 through which the second stem 9 is inserted. Each of the first stem insertion portion 352 and the second stem insertion portion 353 is fitted with a packing P to create a liquid-tight or airtight seal between the inserted stems 8, 9.

The opening 31 is a portion that connects the internal space of the main body 350 with the outside, and is positioned so that it opens in a direction (Y-axis direction) perpendicular to the direction (Z-axis direction) in which the second flow path forming portion 34 extends when viewed from the X-axis direction in the main body 350. The position of the opening 31 in the X-axis direction in the main body 350 is between the first portion 21 and the second portion 22 of the valve element 2 that is located in the internal space (valve element accommodating chamber VR) of the main body 350, i.e., a position corresponding to the flow passage F. In this embodiment, the opening 31 has a circular opening when viewed from the Y-axis direction, and has a flange portion 311 that extends radially outward from the opening end. Furthermore, this opening 31 is larger than the second stem engaging portion 5. Therefore, the second stem engaging portion 5 can be inserted and removed from the main body 350 (valve element accommodating chamber VR) through the opening 31.

The lid portion 32 is a member that extends in a direction perpendicular to the Y-axis direction and seals the opening 31 liquid-tightly or airtightly. In this embodiment, the lid portion 32 is removably fixed to the flange portion 311 of the opening 31 with connecting members such as bolts and nuts.

The subframe 36 has a connecting flange portion 361 that connects to the main flange portion 351 of the main frame 35, and a first flow path forming portion 33 that extends from the connecting flange portion 361. The subframe 36 also has a sheet member placement portion 362 in which the sheet member 4 is placed.

The connecting flange portion 361 is connected to the main flange portion 351 of the main frame 35 to close the internal space of the main body portion 350, thereby defining the valve element accommodating chamber VR in cooperation with the main body portion 350. That is, in the valve device 1 of this embodiment, the main body portion 350, the main flange portion 351, and the connecting flange portion 361 constitute the housing main body 30 that defines the valve element accommodating chamber VR.

The first flow path forming portion 33 is a cylindrical portion extending from the connecting flange portion 361 to the other side in the Z-axis direction and defines the first main passage R1. The first main passage R1 defined by the first flow path forming portion 33 communicates with the internal space (valve element accommodating chamber VR) of the main body portion 350. The first flow path forming portion 33 has a flange 331 extending radially from its tip. This flange 331 is used to connect piping P1, etc., when installing the valve device 1. In this embodiment, the first flow path forming portion 33 is positioned so that its central axis is aligned with the central axis of the second flow path forming portion 34.

The seat member arrangement portion 362 is formed inside the subframe 36 around an opening corresponding to the first main passage R1. This seat member arrangement portion 362 is an annular recess concentric with the first main passage R1, and accommodates the seat member 4 and the biasing member S that biases the seat member 4 toward the valve body 2.

The seat member 4 is arranged in the seat member arrangement portion 362 within the housing main body 30 (specifically, inside the subframe 36) so as to surround the opening corresponding to the first main passage R1. In this embodiment, the seat member 4 has an annular shape when viewed in the Z-axis direction and is arranged concentrically with the first main passage R1.

Specifically, the seat member 4 has a cylindrical tube portion 40 extending in the Z-axis direction, and a seat main body 41 connected to the other end of the tube portion 40 in the Z-axis direction and having a seat surface 42. The seat member 4 is arranged in the seat member arrangement portion 362 with the seat surface 42 facing the valve element accommodating chamber VR. Furthermore, at least the seat surface 42 of the seat member 4 is made of a non-deformable rigid material. In this embodiment, the seat member 4 is made entirely of metal, and the seat surface 42 is a rigid metal surface. The seat surface 42 is an arcuate surface centered on the central axis of the first main passage R1.

The first stem 8 is a shaft-shaped member extending in the X-axis direction. This first stem 8 is inserted into the first stem insertion portion 352 of the housing main body 30 (main body portion 350) so that one end is located outside the housing 3 and the other end is located inside the housing 3 (more specifically, within the valve body accommodating chamber VR) along the axis L. A handle or actuator (not shown) is disposed or connected to one end of this first stem 8, and it rotates around the axis L when the handle or actuator is operated. Furthermore, the first stem 8 supports the valve body 2 at its other end so that it can tilt.

The first stem 8 includes a torque transmission surface 80 on the circumferential surface of the other end thereof that extends in a direction perpendicular to the X-axis direction and is capable of surface contact with the inner circumferential surface 212 of the first stem engagement portion 211 of the valve disc 2. The other end of this first stem 8 is inserted into the first stem engagement portion (concave surface) 211 of the valve disc 2 disposed in the valve disc accommodation chamber VR, thereby engaging with the valve disc 2. When the first stem 8 rotates around the axis L, the torque transmission surface 80 transmits rotational torque to the valve disc 2, causing the valve disc 2 to rotate around the axis L. The torque transmission surface 80 of the first stem 8 is formed to extend in the direction in which the first section 21 extends from the valve main body portion 23 of the valve disc 2, allowing the valve disc 2 to tilt with the valve main body portion 23 leading.

The second stem 9 is an axial member extending in the X-axis direction. This second stem 9 is inserted into the second stem insertion portion 353 of the housing main body 30 (main body portion 350) so that one end is located outside the housing 3 and the other end is located inside the housing 3 (more specifically, within the valve body accommodating chamber VR) along the axis L. A handle or actuator (not shown) is disposed or connected to one end of this second stem 9, and it rotates about the axis L when the handle or actuator is operated.

The second stem 9 also includes a cam surface 90 on the circumferential surface of the other end, the cam surface 90 having a center of curvature at a position eccentric to the axis L. The other end of the second stem 9 is inserted into the second stem engagement portion 5 (more specifically, the concave surface 55) of the valve disc 2 disposed in the valve disc accommodating chamber VR, thereby engaging with the valve disc 2. As the second stem 9 rotates around the axis L, the cam surface 90 switches between a state in which it presses against a first pressing surface S1 included in the inner circumferential surface 551 of the second stem engagement portion 5, and a state in which it presses against a second pressing surface S2 included in the inner circumferential surface 551 of the second stem engagement portion 5.

Next, we will explain the operation of the valve device 1.

First, when a circulating object is to be circulated through the valve device 1 disposed between the pipes P1, the second stem 9 is rotated, causing the cam surface 90 to press against the second pressing surface S2 of the valve element 2 (specifically, the second stem engagement portion 5) (see FIG. 1). In this state, the valve element 2 stands along the axis L and is out of contact with the seat member 4 located around the opening of the first main passage R1 within the housing 3. In this state, the first stem 8 is rotated, causing the valve element 2 to rotate about the axis L, and the flow passage F of the valve element 2 connects the first main passage R1 and the second main passage R2 (see FIG. 2). During this rotation about the axis L, the valve element 2 rotates without contacting the inner surface of the housing 3. When the flow passage F connects the first main passage R1 and the second main passage R2, the circulating object can flow from the first main passage R1 to the second main passage R2 through the flow passage F.

In contrast, when blocking the flow of a flowable medium, the first stem 8 is rotated in the reverse direction, causing the valve element 2 to rotate in the reverse direction about the axis L, with the valve body 23 of the valve element 2 facing the first main passage R1 (see Figure 1). Even during this reverse rotation about the axis L, the valve element 2 rotates without contacting the inner surface of the housing 3. Once the valve body 23 faces the first main passage R1, the second stem 9 is rotated. This causes the cam surface 90 of the second stem 9 to press against the first pressing surface S1 of the valve element 2. This pressing of the first pressing surface S1 tilts the valve element 2 toward the first main passage R1, with the first stem 8 as the fulcrum, and the seal member 231 of the valve body 23 is pressed against the seat surface 42 of the seat member 4, bringing the seal member 231 of the valve body 23 into close contact with the seat surface 42. This blocks (seals) the first main passage R1, preventing the flow of items toward the second main passage R2.

During the opening and closing operation of the valve device 1 as described above, the valve body 2 tilts, i.e., the cam surface 90 of the second stem 9 repeatedly slides around the axis L against the inner surface 551 of the second stem engagement portion 5 (more specifically, the first pressing surface S1 and the second pressing surface S2), causing wear to the first pressing surface S1 and other surfaces.

If this wear exceeds a predetermined amount, the cam surface 90 will not press the first pressing surface S1 sufficiently when closing the valve device 1, preventing the valve body 23 from pressing sufficiently against the seat member 4, which will result in the first main passage R1 not being fully closed. For this reason, when using the valve device 1, the second stem engagement portion 5 will need to be replaced depending on the wear.

Below, the configuration of the part replacement jig used in the replacement of the second stem engaging portion 5 will be explained using Figures 11 to 19, followed by an explanation of the replacement of the second stem engaging portion 5. The valve device 1 in which the replacement of the second stem engaging portion 5 described below is performed is positioned with its axis L perpendicular to the vertical direction.

As shown in Figures 11 and 18, this part replacement jig (hereinafter simply referred to as the "jig") 10 comprises a base 11 that can be removably positioned within the valve disc accommodating chamber VR at a position below the valve disc 2, and a support portion 15 that extends upward from the base 11 and supports the valve disc 2 when the base 11 is positioned within the valve disc accommodating chamber VR.

As shown in Figures 12 to 14 and also Figure 16, the base 11 has a base main body 12 that extends in a direction perpendicular to the Z-axis direction when placed within the valve body accommodating chamber VR and whose peripheral edge, as viewed from the Z-axis direction, abuts against the inner surface of the housing main body 30 that defines the valve body accommodating chamber VR, and a grip portion 13 that is placed on the base main body 12.

The base body 12 is larger than the second main passage R2 when viewed in the Z-axis direction, and the outline of the base body 12 when viewed in the Z-axis direction corresponds to the shape of the inner surface of the housing body 30 below the valve disc 2. Specifically, the base body 12 is a disc-shaped member that, when placed within the valve disc accommodating chamber VR, divides the valve disc accommodating chamber VR into an upper area A1 where the valve disc 2 is placed and a lower area A2 where the valve disc 2 is not placed (see FIG. 16). The base body 12 has a pair of recesses 121 located on the periphery of the surface 12a that faces upward (toward the valve disc 2) when the base body 12 is placed within the valve disc accommodating chamber VR, and a plurality of through holes 122 located inside the recesses 121 in the radial direction of the base body 12.

In this embodiment, the thickness dimension (dimension in the Z-axis direction) of the peripheral portion of the base body 12 is greater than the thickness dimension of the other portion (the portion closer to the center), and a pair of recesses 121 are arranged in this peripheral portion, with multiple through-holes 122 arranged in the portion closer to the center (see Figure 14). The size (diameter) of the base body 12 is also set so that the peripheral portion is positioned below the first portion 21 and second portion 22 of the valve body 2 when the base body 12 is placed in the valve body accommodating chamber VR (see Figure 16).

A pair of recesses 121 are located at both ends of the base body 12 in a predetermined radial direction, and each recess 121 extends in a direction perpendicular to the predetermined radial direction.

Each of the multiple through holes 122 penetrates the base body 12 in the thickness direction and is arranged at intervals in the extension direction of each recess 121, at a position inside the recess 121 in the predetermined radial direction. In this embodiment, each through hole 122 is a threaded hole having a female thread on its inner circumferential surface.

The grip portion 13 is a portion that is gripped by an operator or the like when placing the base 11 in the valve body accommodating chamber VR, and is positioned so as to protrude from the surface 12a of the base body 12. In this embodiment, the grip portion 13 is positioned in the center of the base body 12.

The support portion 15 has a receiving portion 18 that abuts against the valve disc 2 from below, and a spacing adjustment portion 17 that can change the spacing between the receiving portion 18 and the base 11. In the jig 10 of this embodiment, the support portion 15 includes a first support portion 15A and a second support portion 15B. The first support portion 15A and the second support portion 15B are arranged in positions corresponding to one of a pair of recesses 121 on the base 11 and the other recess 121. This allows the first support portion 15A to support the first portion 21 of the valve disc 2 from below, and the second support portion 15B to support the second portion 22 of the valve disc 2 from below. The first support portion 15A and the second support portion 15B of this embodiment have the same configuration. Therefore, the following describes the first support portion 15A in detail.

The first support portion 15A has a base portion 16 that is fixed to the base 11, a spacing adjustment portion (first spacing adjustment portion) 17 that extends from the base portion 16 in the Z-axis direction, and a receiving portion (first receiving portion) 18 that supports the first portion 21 of the valve body 2. The first support portion 15A also has multiple connecting members 19 for removably connecting the base portion 16 to the base main body 12.

The base portion 16 is a member extending radially from the base body 12, and has a protrusion 161 that protrudes toward the base body 12 in the Z-axis direction, and multiple through holes 162 that are positioned corresponding to the through holes 122 in the base body 12. The base portion 16 also has multiple screw holes 163 that are recessed toward the base body 12 from the surface facing away from the base body 12 in the Z-axis direction.

The convex portion 161 has a shape corresponding to the concave portion 121 and fits into the concave portion 121. Furthermore, multiple (two in this embodiment) screw holes 163 are arranged at intervals in a direction perpendicular to the predetermined radial direction.

The spacing adjustment section 17 includes a plate-shaped member 171, multiple stud bolts 172 extending in the Z-axis direction from the base section 16, multiple bearing members 173 arranged on the stud bolts 172 to support the receiving section 18, and multiple nuts 174a, 174b that thread onto the stud bolts 172.

The plate-like member 171 is a rectangular plate-like member whose thickness direction is in the Z-axis direction, and has multiple holes 1711 that penetrate in the Z-axis direction at positions corresponding to the screw holes 163 of the base portion 16.

Each of the multiple stud bolts 172 is inserted through a hole 1711 in the plate-shaped member 171 and threaded into a threaded hole 163 in the base 16. A nut 174a is threaded onto each stud bolt 172, sandwiching the plate-shaped member 171 between the stud bolt and the base 16. In addition, a nut 174b is threaded onto the tip side of the nut 174a of the stud bolt 172 (the end opposite the base 16 side). This nut 174b is used to position the bearing member 173 in the Z-axis direction. The multiple stud bolts 172 are arranged at intervals in a direction perpendicular to the predetermined radial direction.

Each of the multiple bearing members 173 has a cylindrical portion 1731 through which the stud bolt 172 is inserted, and a flange portion 1732 extending radially outward from the open end of the cylindrical portion 1731. Each bearing member 173 is positioned adjacent to the nut 174b, which threads onto the tip of the stud bolt 172, on the distal side of the nut 174b.

With the spacing adjustment unit 17 configured as described above, the spacing in the Z-axis direction between the base body 12 and the flange portion 1732 of the bearing member 173 can be adjusted (changed) by changing the Z-axis position of the nut 174b on the tip side of the stud bolt 172.

The receiving portion 18 is a portion that supports the valve disc 2 by abutting against the valve disc 2 (first portion 21 in the first support portion 15A) from below the valve disc 2. Specifically, the receiving portion 18 is a rectangular plate-shaped member extending in a direction perpendicular to the predetermined radial direction, and has through holes 181 arranged at positions corresponding to the stud bolts 172. The inner diameter of each of these multiple through holes 181 corresponds to the outer diameter of the tubular portion 1731 of the bearing member 173 and is smaller than the outer diameter of the flange portion 1732. As a result, the receiving portion 18 is positioned with the tubular portion 1731 of the bearing member 173 inserted into the through hole 181 and the opening periphery of the through hole 181 resting on the flange portion 1732 (supported from below).

In this embodiment, the connecting member 19 is a bolt that is inserted through the through-hole 162 of the base portion 16 and then screwed into the through-hole 122 of the base body 12, thereby connecting the base portion 16 to the base body 12.

As described above, the second support portion 15B has the same configuration as the first support portion 15A. That is, the second support portion 15B has a base portion 16 that is fixed to the base 11, a spacing adjustment portion (second spacing adjustment portion) 17 that extends from the base portion 16 in the Z-axis direction, a receiving portion (second receiving portion) 18 that supports the second portion 22 of the valve body 2, and multiple connecting members 19 that connect the base portion 16 to the base main body 12.

Next, we will explain the replacement procedure for the second stem engagement portion 5 using the jig 10 configured as described above.

First, remove the lid 32 from the opening 31 to open the opening 31. If the valve body 23 of the valve element 2 is not facing the first main passage R1 at this time, rotate the first stem 8 around the axis L and rotate the valve element 2 so that the valve body 23 is positioned facing the first main passage R1 (so that it is positioned on the upper side).

Once the opening 31 is released, the base 11 of the jig 10 is carried into the valve element accommodating chamber VR through the opening 31 and positioned so as to block the second main passage R2 at the bottom of the valve element accommodating chamber VR (see Figure 16). This results in the valve element accommodating chamber VR being divided into an upper area A1 and a lower area A2 by the base 11.

Once the base 11 is placed in the valve body housing chamber VR, the first support portion 15A and the second support portion 15B are attached to the base 11 (see Figure 17). Specifically, the convex portions 161 of the base portions 16 of each support portion 15A, 15B are fitted into the concave portions 121 of the base body 12, thereby positioning each support portion 15A, 15B relative to the base body 12. Once each support portion 15A, 15B is positioned in this manner, a connecting member 19 is threaded into each through-hole (screw hole) 122 of the base body 12 through each through-hole 162 of the base portion 16, and the threaded connecting member 19 is tightened, thereby connecting (fixing) each support portion 15A, 15B to the base body 12.

At this time, the nut 174b supporting the bearing member 173 in each spacing adjustment portion 17 is moved to a position where it abuts the nut 174a that secures the stud bolt 172 to the base portion 16, or to a position close to it. This creates a gap between the receiving portion 18 of each support portion 15A, 15B and the valve body 2 when the first support portion 15A and the second support portion 15B are attached to the base body 12.

Next, rotate the nuts 174b of each spacing adjustment part 17 to move the receiving parts 18 upward until each receiving part 18 abuts against the valve body 2 (first part 21 or second part 22) and the weight of the valve body 2 is no longer applied to each stem 8, 9 (see Figure 18).

When the weight of the valve body 2 is no longer applied to each stem 8, 9, the second stem engagement portion 5 fixed to the valve body 2 (specifically, the second portion main body 220) is detached from the flow passage F side.

Specifically, the multiple connecting members B connecting the second stem engagement portion 5 and the pressing member 6 are each removed, and then the pressing member 6, which is threadedly engaged with the pressing member arrangement portion 225 of the second section main body 220, is rotated about the axis L to remove it from the pressing member arrangement portion 225 (see Figure 19). Once the pressing member 6 is removed, the key plates K, second stem engagement portions 5, and dust seals 7 are sequentially removed from the retaining section main body 222 and seal arrangement portion 223 of the second section main body 220 (see Figure 20).

In this way, the parts that have been removed from the flow passage F and require replacement (e.g., the second stem engagement portion 5 and dust seal 7) are carried out of the housing 3 through the opening 31. New parts (e.g., the second stem engagement portion 5 and dust seal 7) are then carried into the housing 3 (i.e., the valve body accommodating chamber VR) through the opening 31, and these new parts (e.g., the second stem engagement portion 5 and dust seal 7), the retaining member 6, each key plate K, and each connecting member B are attached to the second portion main body 220 in the reverse order of removal.

Once the new second stem engagement portion 5 is attached to the second part main body 220 in this manner, the receiving portion 18 is lowered and separated from the valve body 2 by the spacing adjustment portion 17 of each support portion 15A, 15B, and then each support portion 15A, 15B is removed from the base main body 12, and each support portion 15A, 15B and the base 11 are carried out of the housing 3 through the opening 31. The lid portion 32 is then attached to close the opening 31, completing the replacement of the second stem engagement portion 5.

The above-described valve device 1 facilitates maintenance when the engagement portion between the valve disc 2 and the second stem 9 for tilting the valve disc 2 becomes worn due to sliding of the second stem 9. In other words, as in the valve device 1 of this embodiment, the second part body 220 is configured so that the second stem engagement portion (recess) 5 can be attached and detached from the flow passage F side. This allows the second stem engagement portion 5 to be attached and detached to the second part body 220 while the valve disc 2 remains positioned within the valve disc accommodating chamber VR, making it possible to replace the second stem engagement portion 5 without disassembling the housing 3 and removing the valve disc 2.

In addition, in the valve device 1 of this embodiment, the housing 3 has an opening 31 that allows communication between the outside of the housing 3 and the flow passage F, and a lid 32 that releasably closes the opening 31, and the opening 31 is larger than the second stem engagement portion 5. Therefore, by opening the opening 31, the flow passage F can be accessed from outside the housing 3 through the opening 31, making it easier to replace the second stem engagement portion 5.

The jig 10 of this embodiment also includes a base 11 that can be removably positioned within the valve body accommodating chamber VR at a position below the valve body 2, and a support portion 15 that extends upward from the base 11 and supports the valve body 2 when the base 11 is positioned within the valve body accommodating chamber VR.

When the valve device 1 is positioned so that the axis L intersects the vertical direction, gravity generates a vertical load (a direction intersecting the axis L) on the engagement portion between the second stem 9 and the valve body 2, which increases friction between the end of the second stem 9 and the concave surface (inner surface) 55 of the second stem engagement portion 5, making it difficult to attach or detach the second stem engagement portion 5 to the second part body 220. However, by supporting the valve body 2 from below with the jig 10, this load is eliminated or reduced, making it easier to attach or detach the second stem engagement portion 5 to the second part body 220.

In addition, in the jig 10 of this embodiment, the support portion 15 has a receiving portion 18 that abuts against the valve disc 2 from below the valve disc 2, and a spacing adjustment portion 17 that can change the spacing between the receiving portion 18 and the base 11. This allows the spacing adjustment portion 17 to change the spacing between the receiving portion 18 and the base 11, so when the jig 10 supports the valve disc 2 in the valve disc storage chamber VR, it is possible to more effectively reduce the load (load due to the weight of the valve disc 2) that occurs at the engagement portion between the end of the second stem 9 and the concave surface 55 of the second stem engagement portion 5 of the valve disc 2. As a result, it becomes easier to replace the second stem engagement portion 5.

In addition, in the jig 10 of this embodiment, the receiving portion 18 has a receiving portion (first receiving portion) that abuts against the first portion 21 of the valve body 2 and a receiving portion (second receiving portion) that abuts against the second portion 22 of the valve body 2, and the spacing adjustment portion 17 has a spacing adjustment portion (first spacing adjustment portion) that can adjust the spacing between the first receiving portion and the base 11, and a spacing adjustment portion (second spacing adjustment portion) that can adjust the spacing between the second receiving portion and the base 11. In other words, the jig 10 has a first support portion 15A and a second support portion 15B. In this way, with the jig 10 of this embodiment, the distance between the first portion 21 and the second portion 22, which are spaced apart in the X-axis direction (axial direction) on the valve body 2, and the base 11 can be adjusted (changed) separately. This more effectively reduces the load (load caused by the weight of the valve body 2) that occurs at the engagement portion between the end of the second stem 9 and the concave surface 55 of the second stem engagement portion (concave) 5 of the valve body 2, making it easier to replace the second stem engagement portion 5.

In addition, in the jig 10 of this embodiment, when placed within the valve element accommodating chamber VR, the base 11 divides the valve element accommodating chamber VR into an upper area A1 where the valve element 2 is located, and a lower area A2 where the valve element 2 is not located. In other words, the base 11 blocks the second main passage R2 located below the valve element 2. In this way, when the jig 10 is placed within the valve element accommodating chamber VR, the valve element accommodating chamber VR is divided into the upper area A1 and the lower area A2 by the base 11. This prevents parts and the like from falling into the lower area A2 of the valve element accommodating chamber VR (the area below the base 11: in this embodiment, within the second main passage R2) when the second stem engaging portion 5 is attached to or detached from the second part main body 220.

The valve device and part replacement jig of the present invention are not limited to the above-described embodiments, and various modifications can of course be made without departing from the spirit of the present invention. For example, the configuration of one embodiment can be added to the configuration of another embodiment, or part of the configuration of one embodiment can be replaced with the configuration of another embodiment. Furthermore, part of the configuration of one embodiment can be deleted.

In the valve device 1 of the above embodiment, parts are carried in and out of the valve element accommodating chamber VR through the opening 31, and parts such as the second stem engagement portion 5 on the valve element 2 are removed and installed. However, this configuration is not limited to this. For example, the valve device 1 may be configured so that parts (such as the second stem engagement portion 5) are carried in and out of the valve element accommodating chamber VR and parts such as the second stem engagement portion 5 on the valve element 2 are removed and installed through the main passage R (in the above embodiment, the first main passage R1 or the second main passage R2). In other words, the housing 3 does not need to have the opening 31. With this configuration, the second stem engagement portion 5 and other parts can be replaced without disassembling the housing 3.

In addition, in the valve device 1 of the above embodiment, the retaining portion (penetrating portion) 221 of the second part main body 220 retains the second stem engaging portion 5 so that it surrounds the periphery of the second stem engaging portion 5 (i.e., surrounds it around the axis L), but this configuration is not limited to this. The second part main body 220 does not have to surround the second stem engaging portion 5. In other words, the specific configuration of the retaining portion 221 is not limited as long as it is configured to allow the second stem engaging portion 5 to be attached and detached from the flow passage F side of the valve body 2.

Furthermore, although the valve device 1 in the above embodiment is a two-way valve, it may also be a three-way valve, etc. In other words, the valve device 1 may have two or more main passages R that communicate with the valve body housing chamber VR.

In addition, in the valve device 1 of the above embodiment, only the second portion 22 of the valve body 2 is configured so that the concave surface 55 that engages with the second stem 9 can be attached and detached from the flow passage F side, but this configuration is not limited to this. The valve body 2 may also be configured so that in addition to the second portion 22, the first portion 21 also has a portion including the concave surface (first stem engagement portion) 211 that engages with the first stem 8 that can be attached and detached from the flow passage F side. In this case, the first portion 21 may have the same configuration as the second portion 22, or may have a different configuration from the second portion 22 so that the portion including the concave surface 211 can be attached and detached from the flow passage F side.

In addition, while the part replacement jig 10 in the above embodiment has two support portions 15A, 15B that support the valve body 2, this configuration is not limited. The part replacement jig 10 only needs to have a support portion 15B that supports at least the second portion 22 (the portion to which the portion 5 including the concave surface 55 is attached so that it can be replaced from the flow passage F side). Furthermore, the part replacement jig 10 may have three or more support portions 15A, 15B, etc.

In addition, in the part replacement jig 10 of the above embodiment, the gap between the base 11 and the receiving portion 18 in the Z-axis direction is adjusted by raising and lowering the nut 174b threaded onto the stud bolt 172, but this configuration is not limited to this. For example, the gap adjustment unit 17 may be configured to adjust the gap between the base 11 and the receiving portion 18 in the Z-axis direction using hydraulic pressure, etc. In other words, the specific configuration of the gap adjustment unit 17 is not limited as long as it is configured to support the valve body 2 by adjusting the gap between the base 11 and the receiving portion 18.

In addition, in the part replacement jig 10 of the above embodiment, the receiving portion 18 supports the valve disc 2 by abutting against the valve disc 2 from below, but this configuration is not limited to this. The receiving portion 18 may also be configured to be connected to the valve disc 2 by a connecting member and fixed by clamping, fitting, etc.

1...valve device, 2...valve body, 21...first portion, 211...first stem engagement portion (concave surface), 212...inner peripheral surface, 22...second portion, 220...second portion main body, 221...retaining portion, 222...retaining portion main body, 222a...inner peripheral surface, 222k...key groove, 223...seal arrangement portion, 224...regulating portion, 225...pressing member arrangement portion, 225a...female thread, 23...valve main body portion, 231...seal member, 3...housing, 30...housing main body, 31...opening, 311...flange portion, 32...lid portion, 33...first flow path forming portion, 331...flange, 34...second flow path forming portion, 34a...flange, 35...main frame, 350...main body portion, 351 ...main flange portion, 352...first stem insertion portion, 353...second stem insertion portion, 36...subframe, 361...connecting flange portion, 362...seat member arrangement portion, 4...seat member, 40...tubular portion, 41...seat main body, 42...seat surface, 5...second stem engagement portion (recessed portion), 50...engagement portion main body, 50a...circumferential surface, 50b...surface facing inward in the X-axis direction, 50k...key groove, 50n...screw hole, 51...first convex portion, 51a...surface facing outward in the X-axis direction, 52...second convex portion, 521...groove, 55...concave surface (inner surface), 551...inner peripheral surface, 552...bottom surface, 553...bottom convex portion, 6...holding member, 6a...male screw, 61...through hole, 7... Dust seal, 8...first stem, 80...torque transmission surface, 9...second stem, 90...cam surface, 10...part replacement jig, 11...base, 12...base main body, 12a...surface, 121...recess, 122...through hole, 13...gripping portion, 15...support portion, 15A...first support portion, 15B...second support portion, 16...base portion, 161...protrusion, 162...through hole, 163...screw hole, 17...gap adjustment portion (first gap adjustment portion, second gap adjustment portion), 171...plate-shaped member, 1711...hole, 172...stud bolt, 173...bearing member, 1731...tubular portion, 1732...flange portion, 174a, 174b...nut, 18...receiving portion (first receiving portion, second receiving portion) ), 181...through hole, 19...connecting member, 600...valve device, 601...valve element, 601a...valve body, 602...valve element chamber, 603...housing, 604...seat member, 605...first stem, 606...second stem, 607...recess, 608...cam surface, A1...upper region, A2...lower region, B...connecting member, F...flow passage, IS...inner surface of housing, K...key plate, L...axis, P...packing, P1...piping, R...main passage, R1...first main passage, R2...second main passage, R11...flow passage, R12, R13...main passage, S...biasing member, S1...first pressing surface, S2...second pressing surface, S10...pressing surface, VR...valve element chamber

Claims (6)

a valve body that is rotatably disposed about a predetermined axis and has a flow passage that passes through an imaginary plane perpendicular or substantially perpendicular to the axis;
a housing having a valve element accommodating chamber for accommodating the valve element, and at least two main passages that can communicate with each other through the flow passage of the valve element in the valve element accommodating chamber;
an annular seat member disposed around an opening that opens toward the valve body accommodating chamber at a position corresponding to one of the at least two main passages in the housing;
a first stem that is engaged with a first portion that is one end of the valve body in the axial direction while being inserted through the housing so as to pass through the axis, and that rotates the valve body around the axis;
a second stem that is inserted through the housing from the opposite side to the first stem so as to pass through the axis and engages with a second portion that is the other end of the valve body in the axial direction, and is capable of tilting the valve body toward the seat member,
the valve element has the first portion, the second portion disposed at a position sandwiching the flow passage between the first portion and the second portion in the axial direction, and a valve main body portion connecting the first portion and the second portion and abutting against the seat member by the tilting of the valve element,
the second section includes a recess having an inner surface defining a space into which the end of the second stem is inserted, and a second section body to which the recess is removably fixed and which is connected to the valve body,
the second portion main body is configured so that the recess can be attached and detached from the flow path side,
The second stem tilts the valve body by sliding the end portion against the inner surface of the recess. the housing has an opening that allows communication between the outside of the housing and the flow path, and a lid that releasably closes the opening,
The valve device of claim 1 , wherein the opening is larger than the recess. 3. A part replacement jig used when replacing the recess in the valve device according to claim 1 or 2, which is arranged so that the axis intersects with a vertical direction,
a base portion that can be removably placed in the valve body accommodating chamber at a position below the valve body;
a support portion that extends upward from the base and supports the valve body when the base is disposed in the valve body accommodating chamber. The part replacement jig described in claim 3, wherein the support portion has a receiving portion that abuts against the valve body from below the valve body, and a gap adjustment portion that can change the gap between the receiving portion and the base portion. the receiving portion has a first receiving portion that abuts against the first portion of the valve body and a second receiving portion that abuts against the second portion of the valve body,
5. The part replacement jig according to claim 4, wherein the spacing adjustment portion has a first spacing adjustment portion capable of adjusting the spacing between the first receiving portion and the base, and a second spacing adjustment portion capable of adjusting the spacing between the second receiving portion and the base. The part replacement jig described in any one of claims 3 to 5, wherein the base, when placed in the valve body accommodating chamber, divides the valve body accommodating chamber into an upper region in which the valve body is located and a lower region in which the valve body is not located.