JP3025790B2 - Double valve operation device for gate valve with built-in auxiliary valve - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a built-in sub-valve in which a gate valve type main valve and a ball valve type sub-valve incorporated in the main valve can be opened and closed by a single manual handle. The present invention relates to a double-valve operating device for a gate valve.

[0002]

2. Description of the Related Art Conventionally, as shown in FIGS. 7 and 8, a gate type main valve element 1 having a built-in ball valve type sub-valve element 2 which can be rotated and opened and closed is provided in a valve box 9. In the gate valve with built-in sub-valve configured to be able to open and close by being moved up and down into the bonnet 10 above the main valve switch 32 provided above the bonnet 10 via the gland packing box 11, The main valve stem 3 is operated by the main valve manual handle 33 while observing the main valve opening meter 34, and the auxiliary valve rod 4 interior extending above the auxiliary valve rod expansion joint and water shutoff box 6. Above the valve stem driving cylinder shaft 7, an auxiliary valve opening meter 36 is provided.
The sub-valve stem 4 is operated by the sub-valve manual handle 35 while observing.

[0003]

However, if the opening and closing operations of the main valve body and the auxiliary valve body are performed by separate manual handles 33, 35, the operation and the time required to move the body during the operation are added, and the labor and time are increased. In addition, the operation procedure of the sub-valve element and the main valve element is easily mistaken, and an operation error is likely to occur.

[0004]

SUMMARY OF THE INVENTION A first object of the present invention is to:
A ball valve type sub-valve element which can solve such problems and effectively operate both valves by one manual handle without causing an operation error. In a gate valve with a built-in sub-valve, which can be opened and closed by moving a main valve body of a gate type incorporating a valve vertically from the inside of a valve box to a bonnet above it, an operation case above the bonnet is provided. A worm screw for driving the main and sub-valves, which can be rotated forward and backward by a manual handle, is mounted inside the worm screw. A main valve opening / closing worm wheel capable of opening / closing the main valve element, and a sub valve opening / closing segment worm wheel capable of rotating the auxiliary valve stem of the sub valve element forward / reverse by forward / reverse rotation.
The main valve body is driven up and down after the auxiliary valve opening / closing segment worm wheel rotates forward and reverse.

A second object of the present invention is to enable the sub-valve element to be opened and closed effectively when the main valve element is fully closed. Therefore, the sub-valve open / close segment worm wheel is rotated by a predetermined angle. When the worm screw is rotated in the reverse direction, the torque is not transmitted from the worm screw.

A third object of the present invention is to make sure that the auxiliary valve can be opened and closed first when switching the rotation direction of the manual handle. Therefore, the rotational force is transmitted from the worm screw. The sub-valve opening / closing segment worm wheel, which is rotated to a position where it is not rotated, is elastically urged toward the worm screw by an elastic machine.

[0007]

When the main handle is fully closed and the manual handle is slightly rotated forward or backward, the auxiliary valve opening / closing segment worm wheel is normally rotated by the worm screw. When the main valve body is fully opened from the fully closed state, the manual handle is rotated forward, and the sub valve opening / closing segment worm wheel is rotated. To make the sub-valve fully open first, and then the main valve opening / closing worm wheel moves forward to fully open the main valve while rotating forward. When the body is fully closed from the fully open state, when the handwheel is reversed, the auxiliary valve opening / closing segment worm wheel is reversed to first fully close the auxiliary valve body, and thereafter the main valve opening / closing worm wheel. - Rolling and can be closed all by downward the main valve body while.

When the auxiliary valve opening / closing segment worm wheel is rotated in a forward / reverse direction by a predetermined angle, no rotational force is transmitted from the worm screw. As a result, the subwheel can be effectively opened and closed.

The sub valve opening / closing segment water pivoting to a position where the rotational force is not transmitted from the worm screw.
When the rotation of the handwheel is switched, the secondary valve opening / closing segment worm wheel is resiliently pressed when the rotation of the manual handle is switched.
As a result, the auxiliary valve element can be reliably opened and closed before the main valve element is opened and closed.

[0010]

1 to 4 show a first embodiment of the present invention, in which a gate type main valve body 1 having a built-in ball valve type sub-valve body 2 which can be opened and closed by rotation is valved. A gate valve with a built-in sub-valve is configured so that it can be opened and closed by being moved up and down from the box 9 to the bonnet 10 above it, but the operation is fixed above the bonnet 10 with a gland packing box 11 interposed. A male screw-type main valve stem 3 is suspended from the inside of the case 8, and a male screw portion of the main valve stem 3 is screwed into a female screw body 31A provided at an upper rear portion of the main valve body 1. On the upper part of the main valve body 1, a sub valve stem universal joint / water stop box 5 in which a sub valve stem 4 for rotating the sub valve body 2 is inserted is fixed. Attaches a secondary valve rod expansion joint and water stop box 6 into which the secondary valve rod 4 is slidably fitted. , The operation of the auxiliary valve rod driving cylinder shaft 7 for interiors said Fukubenbo 4 from above the box 6 Ke - scan 8
It extends and extends up through the inside.

An inner portion of the operation case 8 between the main valve stem 3 and the sub-valve stem 4 has a direction perpendicular to both the stems 3 and 4 and the outside of the casing 8. A worm screw 14 for driving the main / sub valve which can be rotated forward and reverse by the manual handle 25 is mounted on the shaft, and a worm wheel 12 for opening and closing the main valve is provided on one side of the worm screw 14. The main valve opening / closing worm wheel 12 is fitted around the outer periphery of a worm wheel inner ring 13 fitted to the upper portion of the main valve rod 3 via a key 28 while being engaged. As shown in FIG. 3, hook surfaces at both ends of the main valve opening / closing worm wheel 12 are provided between the inner peripheral portion of the opening / closing worm wheel 12 and the outer peripheral portion of the worm wheel inner ring 13 as shown in FIG. a, a is a wow-
The idle play space 2 is designed so that it takes time to abut against the hook surfaces b, b at both ends of the inner wheel 13 of the wheel.
4 is provided, and a main valve opening meter 20A which rotates together with the main valve rod 3 is provided on the upper surface of the operation case 8.

As shown in FIGS. 2 and 3, at the center of the auxiliary valve opening / closing angle setting gear 17 provided at one end of the operation case 8, the auxiliary valve shaft driving cylinder shaft 7 is fixed. A sub-valve opening / closing segment worm wheel 15 which can be rotatably inserted into the sub-valve stem 4 via a universal joint 19 and can be engaged with the worm screw 14 at the other side of the worm screw 14; The auxiliary valve opening / closing angle setting pinion 16 meshing with the opening / closing angle setting gear 17 is keyed to a transmission shaft 18 which is mounted in the case.
9 and 30, respectively, and fitted with a worm screw-1.
4, the auxiliary valve opening / closing segment worm wheel 15 is configured to rotate as shown by the arrow in FIG. 4 to open and close the auxiliary valve body 2. For the auxiliary valve opening / closing segment worm wheel 15 which is rotated to a position where the rotational force is not transmitted from the compression spring 14, a compression spring type elastic member whose elastic pressure can be adjusted by an adjuster 27 as shown in FIG. The push-back fittings 23, 23, which are oppressed by the machine 26, are brought into contact with each other,
The sub-valve opening meter 21 is provided on the upper surface of the operation case 8 to resiliently urge the worm screw 14 and rotate together with the sub-valve driving cylinder shaft 7.

Therefore, the main handle and the sub-valve can be opened and closed while the manual handle 25 is rotated in the normal and reverse directions while viewing the main valve opening meter 20A and the sub valve opening meter 21. When the manual handle 25 is slightly rotated in the closed state, that is, the main valve opening / closing worm wheel 12 is rotated forward or backward so that the main valve opening / closing worm wheel 12 idles until the hook surface a comes into contact with the hook surface b. As shown by a solid line and an imaginary line in FIG. 4, the auxiliary valve opening / closing segment worm wheel 15 is rotated forward or backward until the rotational force is no longer transmitted from the worm screw 14. Valve stem 4
Can be opened and closed by rotating the sub-valve 2 forward and reverse, in which case the worm screw 14
When switching from the normal rotation to the reverse rotation and from the reverse rotation to the normal rotation, the auxiliary valve opening / closing segment worm wheel 15 is resiliently pressed against the worm screw 14 by the spring 26, so that it is immediately engaged. Can be rotated.

When the main valve body 1 is fully opened from the fully closed state, when the manual handle 25 is rotated forward, the main valve opening / closing watch is opened.
The sub-valve opening / closing segment worm wheel 15 is rotated forward while the wheel 12 is idling to open the sub-valve body 2 first, and then the main valve opening / closing worm wheel 12 is moved to the worm wheel. When the main valve body 1 is moved forward while the main valve rod 3 is rotated forward against the inner ring 13, the main valve body 1 can be fully opened, and when the main valve body 1 is fully closed from the fully opened state. When the manual handle 25 is reversed, the auxiliary valve opening / closing segment worm wheel 15 pressed by the ram 26 is immediately reversed by the worm screw 14 so that the sub-valve body 2 is first fully closed, After that, the main valve opening / closing worm wheel 1
2, the main valve body 1 can be moved downward while the main valve rod 3 is rotated in the reverse direction, and can be fully closed.

FIGS. 5 and 6 show a second embodiment of the present invention, which is substantially the same as that of the first embodiment, as indicated by the same reference numerals. An externally threaded main valve stem 3 is screwed to the worm wheel inner ring 13 in a male screw structure fixed so as not to rotate to the upper rear part of the body,
The main valve rod 3 is moved up and down by the forward and reverse rotation of the worm wheel inner ring 13 to open and close the main valve element.

[0016]

As described above, according to the present invention, when the main handle (1) is fully closed and the manual handle (25) is slightly rotated forward or backward, the auxiliary valve opening / closing segment worm wheel is provided. -Le
When the worm screw (14) is rotated forward or backward by the worm screw (14), the sub-valve (2) can be opened and closed, and the main valve (1) is fully closed. If the manual handle (25) is rotated forward, the auxiliary valve opening / closing segment worm wheel (15) is rotated forward to open the auxiliary valve body (2) first, and then the main valve While the valve opening / closing worm wheel (12) rotates forward, the main valve body (1) can be moved upward to fully open the main valve body (1).
To fully close (1) from the fully open state, use the manual handle (2
When 5) is reversed, the sub valve opening / closing segment worm wheel
The sub valve (2) is first fully closed by reversing the wheel (15), and then the main valve (1) is moved downward while the main valve opening / closing worm wheel (12) is reversed. It can be fully closed, and opening / closing operation of the main valve element (1) and the sub-valve element (2) can be performed quickly and easily by simply rotating the one manual handle (25) in the normal and reverse directions, and no operation error occurs. It has the feature that it can be carried out accurately and effectively as described above and can be suitably carried out.

The auxiliary valve opening / closing segment worm wheel
When (15) rotates forward and backward by a predetermined angle, the worm screw
If the rotation force is not transmitted from (14), when the main valve body (1) is fully closed, the sub valve opening / closing segment worm wheel (15) is rotated forward and backward slightly by the manual handle (25). As a result, the sub-valve (2) can be opened and closed effectively.

Further, the auxiliary valve opening / closing segment worm wheel (15) rotating to a position where the rotational force is not transmitted from the worm screw (14) is moved by the ram screw (26) to the worm screw (15). When the rotation direction of the manual handle (25) is switched, the sub valve opening / closing segment worm wheel (15) that has been pressed is pressed by the worm screw (14). As a result, the sub-valve (2) can be reliably opened and closed before the main valve (1) is opened and closed.

[Brief description of the drawings]

FIG. 1 is a partially cutaway front view of a first embodiment of the present invention.

FIG. 2 is an enlarged front sectional view showing a part of FIG. 1;

FIG. 3 is a plan sectional view showing a part of FIG. 2;

FIG. 4 is an enlarged plan sectional view showing a part of FIG. 3;

FIG. 5 is a front sectional view showing a main part of a second embodiment of the present invention.

FIG. 6 is an enlarged front sectional view of FIG. 5;

FIG. 7 is a front view showing a conventional example.

FIG. 8 is a side view showing the right side surface of FIG. 7;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Main valve body 2 Sub valve body 3 Main valve stem 4 Sub valve stem 8 Operation case 9 Valve box 10 Bonnet 12 Main valve opening / closing worm wheel 14 Main / sub valve driving worm screw 15 Sub valve opening / closing segment Worm wheel 25 Handwheel 26 Ammunition

Continuation of the front page (58) Field surveyed (Int.Cl. ⁷ , DB name) F16K 31/53 F16K 31/60

Claims (1)

(57) [Claims] 1. A gate valve type main valve element (1) having a ball valve type sub-valve element (2) which can be opened and closed by rotating it from a lower valve box (9) to an upper bonnet (1). In a gate valve with a built-in sub-valve, which can be opened and closed by being moved up and down in 10), the operation case (8) above the bonnet (10) is rotated forward and backward by a manual handle (25). A worm screw (14) for driving the main and sub-valves, which is capable of
A main valve opening / closing worm wheel (12) attached to the outer periphery of the main valve stem (3) and capable of opening and closing the main valve element (1) by forward / reverse rotation; The auxiliary valve opening / closing segment worm wheel (1) capable of rotating the sub-valve (4) of the sub-valve (2) forward and reverse
5) are formed so as to mesh with each other, so that the auxiliary valve opening / closing segment worm wheel (1) is rotated to a position where torque is not transmitted from the worm screw (14).
5) worm screw (14)
When the auxiliary valve opening / closing segment worm wheel (15) rotates forward and backward by a predetermined angle, the rotational force is not transmitted from the worm screw (14). ) In which the main valve body (1) is driven up and down after rotation of the main valve body (1).