JP6850833B2 - Shut valve - Google Patents

Description

The present invention relates to the technical field of valves, and particularly to closed valves.

The valve plays an important role in shutting off and regulating the medium in the pipeline in which it is located, but the closing valve is a crucial shutoff type valve, and the opening and closing member of the closing valve is the valve body. It is mainly applied to block the medium in an ultra-low temperature environment. Currently, the closed valve on the market has a complicated component structure, and the drive mechanism for driving the valve body is generally connected to the valve stem by adopting a hand wheel, but the production cost of the product is high. Moreover, the assembly is complicated.

Therefore, it is necessary to provide a closing valve having a simple component structure and a low production cost.

In the present invention, in a closed valve including a valve body and a valve body, a male screw rod extending the valve body is fixedly connected to the valve body, and a female screw bush screwed with the male screw rod rotates on the valve body. Connected, the female threaded bush provides a closure valve that drives and moves the valve body in an axially restricted and rotating state of the valve body.

Further, the inside of the valve body is provided with a fluid passage and a valve seat surrounding the fluid passage, and the valve body has a seal taper surface that abuts on the valve seat and closes the fluid passage.

Further, the valve body has a closed state in which the valve body is in contact with the valve seat to close the fluid passage, and an open state in which the fluid passage is opened away from the valve seat, and the valve body is in the closed state by driving the female screw bush. Switch the open state.

Further, the valve body has a first opening and a second opening communicating with the fluid passage, and a connecting pipe is attached to at least one opening.

Further, the valve seat and the valve body have an integral or separate structure.

Further, the valve seat is fixed to the inner wall of the second opening, the valve body is further provided with a third opening arranged to face the second opening, and the male screw rod of the valve body is a third. The valve body extends through the opening.

Further, a position limiting mechanism is provided between the valve body and the valve seat, which is fitted to each other to limit the relative position of the valve seat.

Further, the position limiting mechanism includes a reduced diameter structure provided on the valve body, and a position limiting step portion located on the outer periphery of the valve seat and fitted in contact with the reduced diameter structure.

Further, the valve seat is tubular, and the valve seat is provided with a sealing step portion that is fitted to the valve body toward one end of the third opening.

Further, one end of the valve seat facing the third opening is aligned with the edge of the second opening.

Further, a connecting pipe is inserted and fixed at one end of the valve seat facing the third opening.

Further, a mounting flange is fixed to the outer wall of the valve body.

Further, the mounting flange is located on the outer periphery of the second opening portion.

Further, the valve body and the male screw rod have an integral structure.

Further, an axial position limiting step portion is provided on the inner wall of the valve body, and one end of the female screw bush is inserted into the valve body and fitted into the axial position limiting step portion.

Further, an annular positioning seat is fixed in the valve body, the male screw rod extends from the valve body via the positioning seat, and the axial position limiting step portion is provided by the positioning seat.

Further, the positioning seat is fixed close to the third opening portion of the valve body and near the inner wall of the valve body.

Further, the axial position limiting step portion is located on the axial end surface of the positioning seat or is arranged in an annular shape on the inner wall of the positioning seat.

Further, one end of the female screw bush inserted into the valve body is provided with an outer jaw portion, and the step portion for axial position limiting presses the outer jaw portion to restrict the female screw bush from being separated from the valve body. ..

Further, an operating member is fixedly connected to a portion of the female screw bush located outside the valve body.

Further, the operating member and the positioning seat come into contact with each other along the axial direction of the female screw bush.

Further, the operating member is fixed so as to surround the outer circumference of the female screw bush.

Further, the valve body is provided with a first positioning step portion that is fitted with the female screw bush and limits the limit position of the valve body in the open state.

Further, the first positioning step portion is adjacent to the connecting portion between the valve body and the male screw rod.

Further, the first positioning step portion is fitted in contact with the axial end surface of the female screw bush, or is fitted in contact with the second positioning step portion provided on the inner wall of the female screw bush. To.

Further, a seal sleeve is further provided in the valve body to block the gap between the male thread rod and the female thread bush.

Further, an annular positioning seat is fixed in the valve body, the male screw rod extends to the valve body via the positioning seat, and the seal sleeve is fitted to the valve body in the axial direction of the seal sleeve. It has a first seal end and a second seal end that is fitted to the positioning seat.

In addition, the seal sleeve is a bellows tube.

Further, the first seal sleeve seals and covers the outer periphery of the valve body.

Further, an annular convex portion is provided on the outer periphery of the valve body, and the first seal end portion seals and covers the outer peripheral surface of the annular convex portion.

Further, the second seal end portion seals and covers the outer circumference of the positioning seat.

Further, the second seal end is fixed in the radial gap between the positioning seat and the valve body.

The present invention provides a shutoff valve that has a simple component structure, low production cost, is easy to assemble, and is used to shut off a refrigerant medium in a fluid passage at ultra-low temperatures. Further, one end of the bellows pipe is fixed to the positioning seat, the other end is fixed to the valve body, and one closed space is formed by sealing the positioning seat, the bellows pipe, and the valve body, and the valve body moves up and down. Therefore, a dynamic seal is formed to improve the sealability of the gap between the valve body and the positioning seat. The shutoff valve provided by the present invention has low cost, good sealing performance, is used in an air-conditioning region, can prevent refrigerant leakage at ultra-low temperatures, and is reliable in safety.

It is a structural schematic diagram which the valve of the closing valve by the Example of this invention is fully opened. It is a structural schematic view which the valve of the closing valve of FIG. 1 is fully closed. It is a schematic view of the perspective structure of the closing valve of FIG. It is a schematic diagram of the valve body structure of the closing valve of FIG. It is a schematic diagram of the valve seat structure of the closing valve of FIG. It is a structural schematic diagram of the valve body part of the closing valve of FIG. It is a structural schematic diagram of the valve body of FIG. It is a structural schematic diagram of the bellows tube of FIG. It is a structural schematic diagram of the positioning seat of FIG. It is a structural schematic view of the female screw bush and a rotary nut of FIG. FIG. 10 is a plan view of FIG.

In the embodiment for carrying out the following invention, the present invention will be further described with reference to the above drawings.

In the examples of the present invention, the terms upper, lower, left and right, which are terms indicating directions, are defined with reference to the illustration in the drawings attached to the specification, but are merely for facilitating understanding and description. However, it does not limit the scope of protection of the present application, and the following contents are the same, so the description will not be repeated.

Referring to FIGS. 1 to 11, in an embodiment of the present invention, in a closed valve including a valve body 6 and a valve body 1, a male screw rod 101 extending the valve body 6 is fixedly connected to the valve body 1. A female screw bush 4 screwed with the male screw rod 101 is rotationally connected to the valve body 6, and the female screw bush 4 drives the valve body 1 in a state where the position is restricted in the axial direction of the valve body 6 and the valve body 6 rotates. To provide a closing valve to exercise.

It is understood that the valve body 1 moves in the valve body 6, and the direction of movement of the valve body 1 may be up-down movement, left-right movement, or movement at a constant angle, depending on the arrangement position of the valve body 6. I will get it, so I will not explain it repeatedly. The valve body 1 and the male screw rod 101 may have a separate structure or an integral structure, but the valve body 1 may be driven by a drive mechanism. In this embodiment, the valve body 1 moves up and down along the valve body 6 as an example. However, the valve body 1 and the male screw rod 101 adopt an integral structure, and the male screw rod 101 is attached to the valve body 1. It is fixedly connected to form an integrated valve body and has a simple structure. The drive mechanism is a female screw bush 4, the female screw bush 4 and the valve body 6 are rotationally connected, the female screw bush 4 rotates with respect to the valve body 6, and the female screw bush 4 is axially restricted in the valve body 6. Therefore, the female screw bush 4 cannot generate movement along the axial direction of the valve body 6. The valve body 1 of the present embodiment moves up and down in the valve body 6 under the driving action of the female screw bush 4, thereby blocking the fluid passage 65 formed in the valve body 6, so that the overall structure is as follows. The fluid medium, which is simple, easy to assemble, and flows in the fluid passage 65, may be a liquid or a gas and is used in this embodiment for the flow of the refrigerant at ultra-low temperatures.

In this embodiment, the valve body 6 is provided with a fluid passage 65 and a valve seat 7 surrounding the fluid passage 65, and the valve body 1 has a seal taper surface 106 that abuts on the valve seat 7 and closes the fluid passage 65. Have. The valve seat 7 is located at the bottom end of the valve body 6, is provided so as to surround the fluid passage 65, the valve body 1 moves downward, and the seal taper surface 106 of the valve body 1 comes into contact with the valve seat 7. As a result, the fluid passage 65 formed in the valve body 6 was blocked, and the sealing effect was enhanced.

Specifically, the valve body 1 has a closed state in which the valve body 1 abuts on the valve seat 7 to close the fluid passage 65, and an open state in which the fluid passage 65 is opened away from the valve seat 7. , The closed state and the open state are switched by driving the female screw bush 4.

The position of the valve body 1 so that the valve body 1 moves up and down inside the valve body 6 by the drive of the female screw bush 4 and the fluid passage 65 is closed and the fluid passage 65 is open. It can be understood to switch from time to time. When the valve body 1 moves downward along the valve body 6, the valve body 1 abuts on the valve seat 7 to block the fluid passage 65, and a closed state is formed in which the fluid passage 65 is closed. On the other hand, when the valve body 1 moves upward along the valve body 6, the valve body 1 is separated from the valve seat 7 to open the fluid passage 65, and the fluid can flow in the fluid passage 65, so that the fluid can flow. An open state of the passage 65 is formed.

Specifically, the valve body 6 has a first opening 61 and a second opening 63 that communicate with the fluid passage 65, and a connecting pipe is attached to at least one opening. It can be understood that the valve body 6 changes the flow direction of the fluid through the passage of the fluid medium formed by the installation of the opening to achieve the flow of the fluid in the opening. A connecting pipe is connected to the opening, and a passage for a new fluid medium can be formed. Depending on the situation, whether or not to attach the connecting pipe, the connecting pipe is connected to the first opening 61, if necessary. A connecting pipe may be connected to the second opening 63, or a connecting pipe may be connected to both openings. When the valve body 1 moves downward, it blocks the passage of the fluid medium formed between the first opening 61 and the second opening 63.

Specifically, the first opening 61 is provided on the side wall of the valve body 6, the second opening 63 is the bottom of the valve body 6, and the first connecting pipe 8 is connected to the first opening 61. Alternatively, the second connecting pipe 9 may be connected to the second opening 63, and when the valve body 1 moves downward, the seal tapered surface 106 of the valve body 1 and the valve seat 7 are closed. , The passage through which the fluid medium flows between the second opening 63 and the valve body 6 is blocked, in other words, the passage of the second connecting pipe 9 and the first opening 61, the second connecting pipe 9 and the second. The passage of the fluid medium formed between the connecting pipe 8 of 1 is blocked.

Specifically, the valve seat 7 and the valve body 6 have an integral or separate structure. When the valve seat 7 and the valve body 6 are integrated, the parts of the closing valve are simple and can be fixed between the valve seat 7 and the valve body 6 without further installation of a fixing device. When the valve seat 7 and the valve body 6 are separate bodies, it is easy to replace the parts, and the position of the valve seat 7 can be set as needed.

Specifically, the valve seat 7 is fixed to the inner wall of the second opening 63, and the valve body 6 is further provided with a third opening 64 arranged to face the second opening 63, and the valve body 6 is provided. The male screw rod 101 of 1 extends the valve body 6 through the third opening 64.

The valve seat 7 may fix the valve seat 7 to the inner wall of the second opening 63 by conventional means such as welding, and the second opening 63 is located at the bottom end of the valve body 6 and is located on the valve body 6. It can be understood that a third opening 64 is arranged at the apex and the female thread bush 4 is provided in the third opening 64.

In this embodiment, a position limiting mechanism is provided between the valve body 6 and the valve seat 7 so as to be coupled to each other to limit the relative position of the valve seat 7. The position limiting mechanism limits the relative position of the valve seat 7, the valve seat 7 can easily enter the valve body 6, and when welding and fixing to the valve body 6, the position of the valve seat 7 is accurately determined, and the valve seat 7 is fixed. It prevents the valve body 6 of 7 from becoming difficult to fix in the valve body 6.

Specifically, the position limiting mechanism is a position limiting step that is located on the outer periphery of the reduced diameter portion 62 structure provided on the valve body 6 and the valve seat 7 and is fitted in contact with the reduced diameter portion 62 structure. Includes part 72. It can be understood that the position limiting mechanism may be other conventional means such as means with positioning pins.

Specifically, the valve seat 7 has a cylindrical shape, and the valve seat 7 includes a sealing step portion 71 that is fitted to the valve body 1 toward one end of the third opening 64. The sealing step portion 71 comes into contact with the sealing tapered surface 106 of the valve body 1 to enhance the sealing effect.

In this embodiment, a connecting pipe is inserted and fixed at one end of the valve seat 7 facing the third opening 64. That is, when the second connecting pipe 9 is inserted at the position of the second opening 63 to extend the fluid passage and the valve body 1 moves downward in the circulation passage, the second connecting pipe 9 and the second connecting pipe 9 are inserted. The fluid passage with the first opening 61 is blocked.

Specifically, one end of the valve seat 7 facing the third opening 64 is aligned with the edge of the second opening 63. The valve seat 7 is aligned with the second opening 63 so that the parts are flatly aligned and the connection of the second connecting pipe 9 is facilitated.

In this embodiment, the mounting flange 10 is fixed to the outer wall of the valve body 6 to facilitate the connection between the valve body 6 and other members.

Specifically, the mounting flange 10 is located on the outer periphery of the second opening 63 portion. The valve body 6 is fixed to the second connecting pipe 9 by the mounting flange 10, and the flange can improve the sealing property and the fastening property between the second connecting pipe 9 and the valve body 6.

Specifically, the valve body 1 and the male screw rod 101 have an integral structure. It can be understood that the male screw rod 101 is a portion of the valve body 1 where a screw is provided, the valve body 1 and the male screw rod 101 have an integral structure, the component structure is simple, and the attachment is easy.

In this embodiment, an axial position limiting step portion 31 is provided on the inner wall of the valve body 6, and one end of the female screw bush 4 is inserted into the valve body 6 and fitted into the axial position limiting step portion 31. Will be combined. The position of the female thread bush 4 is fixed in the axial direction by the step portion 31 for limiting the position in the axial direction so that the female thread bush 4 does not move up and down along the valve body 6. It can be understood that the axial position limiting step portion 31 may be provided on the valve body 6 or may be provided by another separately provided component on the valve body 6.

In this embodiment, an annular positioning seat 3 is fixed in the valve body 6, the male screw rod 101 extends from the valve body 6 via the positioning seat 3, and the stepped portion 31 for axial position limiting is formed. Provided by the positioning seat 3. The positioning seat 3 and the valve body 6 are fixedly connected, the positioning seat 3 includes a through hole, the female screw bush 4 is placed in the positioning seat 3, and the female screw bush 4 is a step portion 31 for limiting the axial position of the positioning seat 3. It can be understood that the male thread rod 101 is connected to the valve body 6 and driven to extend the valve body 6 via the positioning seat 3.

Specifically, the positioning seat 3 is fixed in close contact with the third opening 64 portion of the valve body 6 and in close contact with the inner wall of the valve body 6. The positioning seat 3 can be fixedly fixed to the inner wall of the valve body 6 by adopting a method such as welding, and the positioning seat 3 can be fixedly connected to the third opening 64 part of the valve body 6, that is, the valve. Close to the upper end portion of the body 6, the female screw bush 4 facilitates the driving and movement of the valve body 1 by fixing the positioning seat 3.

Specifically, the axial position limiting step portion 31 is located on the axial end surface of the positioning seat 3 or is arranged in an annular shape on the inner wall of the positioning seat 3 so that the female screw bush 4 can be connected. Since the step portion 31 for limiting the axial position is located on the axial end surface of the positioning seat 3, it is easy to assemble it integrally with the female screw bush 4. The position where the female screw bush 4 and the positioning seat 3 are rotationally connected may be the top end portion, the middle end portion, or the bottom end portion of the positioning seat 3, as long as the rotational connection can be achieved.

Specifically, an outer jaw portion 41 is provided at one end of the female screw bush 4 inserted into the valve body 6, and an axial position limiting step portion presses the outer jaw portion 41 into contact with the valve body of the female screw bush 4. Restrict withdrawal from 6.

In this embodiment, the operating member 5 is fixedly connected to a portion of the female screw bush 4 located outside the valve body 6. Since the operating member 5 provides one good force point to the outside, by applying an external force to the operating member 5, the female screw bush 4 is driven and rotated, and the valve body 1 is in the axial direction of the screw bush 4. It can be understood that the valve body 1 is driven so as to make a linear reciprocating motion along the line. The operating member 5 may be a rotary nut, a fixing plate, a fixing rod, or the like, and the operating member 5 is fixedly connected to the female screw bush 4.

Specifically, the operating member 5 and the positioning seat 3 come into contact with each other along the axial direction of the female screw bush 4. The operating member 5 abuts on the upper end of the positioning seat 3 and is rotatable with respect to the positioning seat 3.

Specifically, the operating member 5 is fixed so as to surround the outer circumference of the female screw bush 4. The operating member 5 employs a rotating nut, and the rotating nut is fixedly connected to the female screw bush 4. However, the operating member 5 may be a rotating nut, or may be another force plate or a force rod. .. For the fixed connection, welding or other fixed connection method conceivable by those skilled in the art can be adopted. The rotating nut may be a polygonal nut, such as a hexagonal nut or an octagonal nut, but it can be understood that a hexagonal nut, which is advantageous for operation and rotation, is preferred.

One end of the female screw bush 4 is connected to the rotary nut, and the other end is connected to the positioning seat 3. However, it is sufficient if this connection condition can be satisfied within the height range of the female screw bush 4, and in this embodiment, it is sufficient. The height of the female screw bush 4 is the same as the sum of the height of the positioning seat 3 and the height of the rotary nut, and the space can be distributed more rationally.

In this embodiment, the valve body 1 is provided with a first positioning step portion 105 that is fitted with the female screw bush 4 and limits the limit position of the valve body 1 in the open state. When the valve body 1 moves toward the third opening 64, the first positioning step portion 105 abuts on the female screw bush 4 to limit the limit position of the valve body 1 in the open state. The first positioning step portion 105 prevents the valve body 1 from rotating and detaching from the female screw bush 4.

Specifically, the first positioning step portion 105 is adjacent to a portion where the valve body 1 and the male screw rod 101 are connected.

Specifically, the first positioning step portion 105 is fitted in contact with the axial end surface of the female screw bush 4, or the second positioning step portion 42 provided on the inner wall of the female screw bush 4. It comes into contact with and is fitted. It can be understood that the first positioning step portion 105 is in contact with and fitted to the axial end surface of the female screw bush 4 to limit the limit position of the valve body 1 in the open state. In order to achieve a better fitting action, a second positioning step portion 42 is provided on the inner wall of the female screw bush 4, and the second positioning step portion 42 is the first positioning step portion 105. To limit the limit position of the valve body 1 in the open state.

In this embodiment, a seal sleeve 2 that blocks the gap between the male thread rod 101 and the female thread bush 4 is further provided in the valve body 6. The seal sleeve 2 can increase the sealing effect and prevent the fluid medium in the fluid passage 65 from flowing into the gap between the male thread rod 101 and the female thread bush 4. It can be understood that the seal sleeve 2 is an elastic sleeve and can change to the size of the space according to the movement of the valve body 1.

Specifically, an annular positioning seat 3 is fixed in the valve body 6, and the male screw rod 101 extends from the valve body 6 via the positioning seat 3 and is a seal sleeve in the axial direction of the seal sleeve 2. Reference numeral 2 denotes a first seal end portion 21 fitted with the valve body 1 and a second seal end portion 22 fitted with the positioning seat 3. An outer jaw portion 41 is provided at one end of the female screw bush 4 to be inserted into the valve body, and an axial position limiting step portion 31 of the positioning seat 3 presses the outer jaw portion 41 so that the female screw bush comes from the valve body 6. Restrict withdrawal. A sealed space is formed by sealing the positioning seat 3, the seal sleeve 2, and the valve body 1, and a dynamic seal is formed in the vertical reciprocating process of the valve body 1, and a gap between the valve body 1 and the positioning seat 3 is formed. Improves the sealing performance of.

Specifically, the seal sleeve 2 is a bellows tube. It can be understood that the bellows tube 2 forms a dynamic seal during the movement of the valve body. The bellows tube 2 is provided with an elastic bellows and can be expanded and contracted up and down.

Specifically, the first seal end portion 21 seals and covers the outer periphery of the valve body 1. An annular convex portion 103 is provided on the outer periphery of the valve body 1, the first seal end portion 21 seals and covers the outer peripheral surface of the annular convex portion 103, and the annular convex portion 103 is covered with the valve body 1. It is advantageous for close contact connection with the seal sleeve 2.

The second seal end 22 seals and covers the outer periphery of the positioning seat 3. The second seal end 22 is fixed in the radial gap between the positioning seat 3 and the valve body 6. The second seal end 22 is connected to the positioning seat 3, on which the seal sleeve 2 can be fixed by the positioning seat 3, and on the other side, the sealing property of the gap between the valve body 1 and the positioning seat 3 is provided. Can be improved.

The valve body 6 is integrally molded, and the valve body 6 is made of thin-walled stainless steel, so that the production cost is low and the performance is good. The valve body 1 is a cylindrical multi-boss (original language notation: multi-convex stand) and has good structural stability.

In this embodiment, the component structure of the closing valve is simple, easy to assemble, and has good sealing performance. At the same time, the closing valve, which is completely sealed compared to the commercially available O type and uses a bellows tube, can effectively improve the sealing performance of the closing valve, and is a closing valve used in the market, which is a closing valve made entirely of brass. The thin-walled stainless steel adopted in the examples of the present invention has good safety, low production cost, and when used in an air-conditioning region, it has a high production cost and prevents refrigerant leakage in an ultra-low temperature environment. It can be effectively prevented and the safety is reliable.

The specific achievement process of this embodiment is as follows.
Process in which the valve body 1 is fully opened: The rotary nut is rotated clockwise, the rotary nut interlocks the female screw bush 4 to rotate, and the female screw bush 4 interlocks the valve body 1 with the screw to move upward. , The bellows tube 2 is shrunk. When the seal taper surface 106 of the valve body 1 comes into contact with the second positioning step portion 42 at the bottom of the female screw bush 4, the valve body is fully opened. The bellows pipe 2, the valve body 1, and the positioning seat 3 form a closed cavity to prevent leakage of the refrigerant.

Process in which the valve body 1 is fully closed: The rotary nut is rotated counterclockwise, the rotary nut interlocks with the female screw bush 4 to rotate, and the female screw bush 4 interlocks the valve body 1 with the screw to move downward. The bellows tube 2 is stretched by exercising. When the seal taper surface 106 at the bottom of the valve body 1 comes into contact with the sealing step portion 71 of the valve seat 7, the valve body 1 is fully closed, and the valve body 1 and the valve seat 7 form a seal to form a seal for the refrigerant. Prevent leaks.

The technical features of the above-described examples can be arbitrarily combined, and for the sake of brevity, all combinations that each technical feature of the above-described examples can have are not described. To the extent that there is no conflict in the combination of these technical features, all are considered to be within the scope described herein.

It is understood that the examples described above merely represent some embodiments of the present invention, and the description thereof is more specific and detailed, but this limits the scope of the patent. should not be done. Those skilled in the art may make slight changes and improvements, provided that they do not deviate from the gist of the present invention, and all of them belong to the scope of protection of the present invention. Therefore, the scope of protection of this patent should be based on the scope of the attached claims.

Valve body 1
Male screw rod 101
Circular convex part 103
First positioning step 105
Seal taper surface 106
Seal sleeve 2
First seal end 21
Second seal end 22
Positioning seat 3
Axial position limiting step 31
Female screw bush 4
Lateral jaw 41
Second positioning step 42
Operating member 5
Valve body 6
First opening 61
Reduced diameter part 62
Second opening 63
Third opening 64
Fluid passage 65
Valve seat 7
Stepped part for sealing 71
Position limiting step 72
First connecting pipe 8
Second connecting pipe 9
Mounting flange 10

Claims (9)

A closed valve including a valve body and a valve body. A male screw rod extending from the valve body is fixedly connected to the valve body, and a female screw bush screwed with the male screw rod rotates on the valve body. The female thread bush is connected, and the valve body is driven and moved in a state where the position is restricted and the valve body is rotated in the axial direction .
An annular positioning seat is fixed in the valve body, one end of the female screw bush is inserted into the valve body and fitted to the positioning seat, and the male screw rod is inserted through the positioning seat. A closed valve characterized in that it extends from the valve body. The first aspect of the present invention, wherein the valve body is provided with a fluid passage and a valve seat surrounding the fluid passage, and the valve body has a seal tapered surface that abuts on the valve seat and closes the fluid passage. Closing valve. The valve body has a closed state in which the valve body is in contact with the valve seat to close the fluid passage and an open state in which the fluid passage is opened away from the valve seat, and the valve body is in the closed state by driving the female screw bush. The closing valve according to claim 2, wherein the open state is switched. The positioning seat stepped portion for the axial position limit is provided in the end portion of the female screw bush of claims 1 to 3, characterized in that fitted in the axial position restricting stepped portion The shutoff valve according to any one paragraph. Wherein the one end portion inserted into the valve body of the female screw bush comprises an outer jaw, the axial position limiting step portion is pressed against the outer jaw, that the internal thread bushing is disengaged from the valve body The closing valve according to claim 4, characterized in that it is restricted. The closing valve according to any one of claims 1 to 5, wherein an operating member is fixedly connected to a portion of the female screw bush located outside the valve body. The closing valve according to any one of claims 1 to 6, further comprising a seal sleeve that blocks a gap between the male thread rod and the female thread bush in the valve body. In the axial direction of the sheet Rusuribu, seal sleeve in claim 7, characterized in that it comprises a second closed end portion to be fitted to the first closed end, and a positioning seat which is fitted to the valve body The shutoff valve described. The closing valve according to claim 7 or 8 , wherein the seal sleeve is a bellows tube.

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