JPH08145201A - Gate valve - Google Patents

Abstract

(57) [Abstract] [Purpose] To provide a gate valve that eliminates sliding during valve operation and greatly reduces frictional force to reduce operating force. [Structure] Roller or ball 18A, 1 during valve closing operation
8B is located in the recessed engagement portions 17A and 17B, and the split valve body 1
1A and 11B are close to each other. Split valve body 11A, 11B
When the valve rod 15 continues to move by stopping the sliding of the roller, the roller or the ball 18 rolling on the slopes 19A and 19B.
A, 18B are displaced in the flow path direction 3, and the split valve bodies 11A, 1
1B is moved relatively away, and is strongly pressed against the valve box seat portions 4A and 4B to close the valve. The valve can be opened by the reverse action.
When the opening / closing operation of the valve body 10 is performed, the rollers or balls 18A, 18B roll on the slopes 19A, 19B and no sliding occurs, and the frictional force is greatly reduced, and the operating force can be reduced. The pressing surface pressure against the valve box seat portions 4A and 4B can be easily increased.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a gate valve interposed in, for example, an air / gas line.

[0002]

2. Description of the Related Art Conventionally, a structure shown in FIG. 7 has been provided as a gate valve of this type. That is, the gate valve 31 is a valve box
A flow path 33 is formed in 32, and a valve body 34, which is divided into two in the flow path direction, is arranged at an intermediate portion of the flow path 33. A support base 35 is integrated on the top of the valve box 32, and a stand is mounted on the support base 35.
36 is erected, and an opening / closing drive device 37 including a hydraulic cylinder, an electric speed reducer, etc. is disposed on the stand 36. The stem 38 of the opening / closing drive device 37 and the valve rod 39 are integrally connected via a flange joint 40. Valve rod 39
A wedge body 41 having lower conical sloped surfaces 41a and 41b is provided at the lower end of the pressure-reduced surfaces 34a and 34b formed on the inner surfaces of the pair of split valve bodies 34A and 34B. Pressed.

According to the above conventional configuration, the opening / closing drive unit 37
Is driven to lower the valve rod 39 via the stem 38, so that the slanted surfaces 41a and 41b of the wedge body 41 are separated into the split valve bodies 34A and 34B.
Of the valve seat 43 of the valve box 32 by pressing the pressure receiving surfaces 34a, 34b of the valve seats 34a, 34b, and moving the split valve bodies 34A, 34B away from each other by the pressure contact force.
By pressing against A and 43B, both split valve bodies 34A and 34B can be fully closed.

[0004]

SUMMARY OF THE INVENTION In the above conventional configuration,
By using the wedge body 41 to press the valve body 34, that is, the split valve bodies 34A and 34B, sliding occurs between the wedge body 41 and the split valve bodies 34A and 34B when they are pushed, resulting in a large friction. Power is generated. Therefore, a large operating force is required, which leads to an increase in the size of the opening / closing drive device 37.

An object of the present invention is to provide a gate valve which can eliminate sliding at the time of valve operation and can greatly reduce frictional force to reduce operating force.

[0006]

In order to achieve the above object, a gate valve of the present invention has a valve body which is divided into two parts in the direction of a flow path, and which is provided on a valve rod side with a recessed locking portion so as to form a roller or a ball. In addition, the opening operation direction side of the recessed engagement portion is formed on an inclined surface farther from the valve shaft axis toward the opening operation direction side, and the roller or ball is formed on the inner surface of at least one of the split valve bodies. It is configured to come into contact with each other.

[0007]

According to the above-described structure of the present invention, when the valve is closed, the roller or the ball is located in the recessed engagement portion, and the split valve bodies are close to each other. And the valve body and the valve rod are
Slide along the flow path. First, at least one of the split valve bodies is prevented from sliding, and at this time both split valve bodies face the valve box seat portion with a slight gap. If the valve rod continues to move in the closing operation direction in this state, the roller or ball rolls on the moving slope, and this roller or ball displaces in the flow path direction. Relatively move apart (push apart). Therefore, the split valve body can be strongly pressed against the valve box seat portion, and thus the valve can be closed to shut off the fluid flow.

To open the valve from the closed state, the slope is moved in the opening operation direction via the valve rod. Then, the roller or the ball rolls on the moving slope, and the roller or the ball is displaced in the opposite direction in the flow path direction. As a result, the two split valve bodies are relatively moved toward each other to move the split valve body. It may be separated from the valve box seat portion. Then, by moving both split valve bodies together with the valve shaft in the opening operation direction, the valve bodies can be opened and the fluid can flow.

In this way, when the valve body is opened and closed, the roller or ball rolls on the slope and no sliding occurs, and the frictional force is greatly reduced to reduce the operating force. In addition, the pressing surface pressure against the valve box seat portion can be easily increased.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT A first embodiment of the present invention will be described below with reference to FIGS.
It will be described based on. The flow path 2 is formed on the valve box 1 side, and the valve box seat portion 4A,
4B and a stopper 5 are provided. The valve body 10 disposed in the valve box 1 is divided into two in the flow path direction 3, and the split valve bodies 11A, 11B have brackets 12A, 11A, 11B at the ends in the closing operation direction 7, which protrude toward the opposite sides. 12B is provided, and both brackets 12A and 12B are connected to each other via a pin 21 and a long hole 22. Rolling surfaces 13A and 13B are formed on the inner surfaces of the split valve bodies 11A and 11B facing each other and from the intermediate portion in the opening / closing operation direction to the end portion on the opening operation direction 8 side. And both split valve body
Locked members 14A, 11A, 11B extending from the ends in the opening operation direction 8 to the opposite sides and then bending in the closing operation direction 7 side
14B is provided.

A support member 16 is attached to an end portion of a valve rod 15 which is interlocked with an opening / closing drive device (not shown), and the support member 16 is positioned between the split valve bodies 11A and 11B. Recessed locking portions 17A and 17B that are open to the outside are formed on both surfaces of the support member 16 in the flow path direction 3, and these recessed locking portions are formed.
Roller (or ball) 18A, 18B through 17A, 17B
Is arranged. The rollers 18A and 18B are configured to be in contact with the corresponding rolling surfaces 13A and 13B.

Opening direction 8 of the recessed engaging portions 17A, 17B
The side is a slope 19 that is farther from the valve stem axis 9 as the opening direction 8 is
A and 19B are formed. Recessed locking portions 20A, 20B that are open in the opening operation direction 8 side are formed at the ends of the support member 16 in the opening operation direction 8, and the engaged portions are engaged with the locking portions 20A, 20B. Stop members 14A and 14B are configured to be engageable.

The operation of the first embodiment will be described below. FIG. 1 shows the state immediately before the valve is closed. At this time, the locked members 14A, 14B are engaged with the locking portions 20A, 20B, and the split valve bodies 11A, 11B are supported by the support member 16 in a suspended state. The rollers 18A and 18B are located in the recessed engagement portions 17A and 17B, and the split valve elements 11A and
11B are close to each other.

During such a valve closing operation, the valve body 10 and the valve rod 15 slide together in the flow path 2. Then, first, both split valve bodies 11A and 11B are brought into contact with the stopper 5 to prevent further sliding. At this time, both split valve bodies 11A,
11B is opposed to the valve box seat portions 4A and 4B with a slight gap. In this state, if the movement of the support member 16 in the closing operation direction 7 is continued via the valve rod 15, the rollers 18A and 18B roll on the moving slopes 19A and 19B, and these rollers 18A and 18B. Are separated from each other in the flow path direction 3.

As a result, the split valve bodies 11A and 11B are moved away from each other (pushing apart) via the rolling surfaces 13A and 13B,
As shown in FIG. 2, the split valve bodies 11A and 11B are strongly pressed against the valve box seat portions 4A and 4B, and can be closed to shut off the fluid flow.

To open the valve from such a closed state, the support member 16 is moved in the opening operation direction 8 via the valve rod 15.
Then, the rollers 18A and 18B move on the moving slopes 19A and 19B.
Rolls, and these rollers 18A and 18B come close to each other in the flow path direction 3. As a result, the rolling surfaces 13A, 13
Both split valve bodies 11A and 11B are moved toward each other via B,
The split valve bodies 11A and 11B are separated from the valve box seat portions 4A and 4B.

The locking portions 20A and 20B are the locked members 14
The split valve bodies 11A and 11B are engaged with A and 14B, and are supported by the support member 16 in a suspended manner to be moved in the opening operation direction 8. As a result, the valve body 15 can be opened, and the fluid can flow.

When the valve body 10 is opened and closed in this way,
Roller 18 against rolling surfaces 13A, 13B and slopes 19A, 19B
As A and 18B roll and no sliding occurs, the frictional force can be greatly reduced and the operating force can be reduced.
The pressing surface pressure against the valve box seat portions 4A and 4B can be easily increased.

In addition, due to the slidable connecting structure consisting of the brackets 12A and 12B, the pin 21 and the elongated hole 22, both split valve bodies 11A and 11B are excessively opened when the valve is opened, and the rollers 18A and 18B are opened.
Inconvenience such as B falling can be prevented.

3 and 4 show a second embodiment of the present invention. That is, the annular groove-shaped locked portion 25 is formed only on one of the split valve bodies 11A, and the ring-shaped locking portion 26 provided on the valve rod 15 side is engaged with the locked portion 25. There is. Support member
The recess 16 has a recessed engagement portion 17B and a sloped surface 19B formed only on the other side, and a vertical guide surface 27 is formed on one side. A plurality of guide rollers 28, which are in contact with the guide surface 27 and are rollable, are supported by one of the split valve bodies 11A. The other split valve body 11B is free to float on one split valve body 11A, and at that time, a stopper portion 29 for preventing the protrusion is formed on the other split valve body 11B side.

According to this second embodiment, as shown in FIG. 3, the valve body 10 and the valve rod 15 slide together in the flow path 2 during the valve closing operation. And, first, one split valve body 11A
Is brought into contact with the stopper 5 to prevent further sliding. In this state, if the movement of the support member 16 in the closing operation direction 7 is continued, the roller 18B rolls on the moving slope 19B, whereby the other split valve body is moved through the rolling surface 13B.
11B is moved, and due to the reaction force, both split valve bodies 11A, 11
B are moved away from each other (pushing apart), and as shown in FIG. 4, the split valve bodies 11A and 11B are strongly pressed against the valve box seat portions 4A and 4B, thereby closing the valve and allowing the fluid flow. You can block it.

5 and 6 show a third embodiment of the present invention. That is, one split valve body 11A also serves as a support member, and the valve rod 15 is connected to this split valve body 11A. The split valve bodies 11A and 11B are elastically biased by the leaf spring 30 so as to approach each other.

According to the third embodiment, as shown in FIG. 5, the valve element 10 and the valve rod 15 slide together in the flow path 2 during the valve closing operation. And first, the other split valve body 11B
Is brought into contact with the stopper 5 to prevent further sliding. In this state, one split valve element 11 is inserted through the valve rod 15.
When the movement of A in the closing operation direction 7 is continued, the roller 18B rolls on the moving slope 19B, whereby the rolling surface 13B.
The other split valve body 11B is moved against the leaf spring 30 via the, and the other split valve body 11B is strongly pressed against the valve box seat portion 4B as shown in FIG. It may be valved to block fluid flow.

[0024]

According to the present invention having the above-mentioned structure, when the valve body is opened and closed, by rolling the roller or the ball on the slope, the occurrence of sliding can be prevented and the frictional force can be reduced. It is possible to greatly reduce the operation force, reduce the size of the opening / closing drive device, and easily increase the pressing surface pressure against the valve box seat portion. As a result, a favorable opening / closing operation can be performed.

[Brief description of drawings]

FIG. 1 is a longitudinal sectional view of a valve body portion of a gate valve immediately before a valve is closed according to a first embodiment of the present invention.

FIG. 2 is a vertical cross-sectional view when the valve body portion of the gate valve is closed.

FIG. 3 is a vertical sectional view of the valve body portion of the gate valve immediately before the valve is closed according to the second embodiment of the present invention.

FIG. 4 is a vertical cross-sectional view when the valve body portion of the gate valve is closed.

FIG. 5 is a longitudinal sectional view of the valve body portion of the gate valve immediately before the valve is closed according to the third embodiment of the present invention.

FIG. 6 is a vertical cross-sectional view of the valve body of the gate valve when the valve is closed.

FIG. 7 is a vertical cross-sectional view showing a conventional example when the gate valve is closed.

[Explanation of symbols]

 1 valve box 3 flow direction 4A valve box seat part 4B valve box seat part 7 closing operation direction 8 opening operation direction 9 valve stem axis 10 valve body 11A split valve body 11B split valve body 13A rolling surface (inner surface) 13B rolling Moving surface (inner surface) 15 Valve rod 16 Support member 17A Recessed locking part 17B Recessed locking part 18A Roller or ball 18B Roller or ball 19A Slope 19B Slope 27 Guide surface 28 Guide roller

Claims (1)

[Claims] 1. A valve body is divided into two in the direction of the flow path, and on the valve rod side,
A roller or a ball is disposed through the recessed locking portion, and the opening operation direction side of the recessed locking portion is formed on an inclined surface that is farther from the valve stem axis toward the opening operation direction side. Is configured so that it can be brought into contact with the inner surface of at least one of the split valve bodies.