JPH0628438U - Check valve built-in ball valve - Google Patents

Abstract

(57) [Summary] [Purpose] To provide a ball valve with a built-in check valve, which has high reliability and high durability, which does not damage or malfunction the built-in check valve. [Structure] A ball valve 1 having a built-in check valve 3,
The check valve 3 includes an elastic seat member 3c on the valve seat portion of the valve body 3a.
Is mounted, and when the check valve 3 is closed, the valve body 3a moves until the elastic seat member 3c is appropriately compressed, and then the valve body 3a comes into contact with the stopper member 4 and is stopped. ing.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a ball valve with a built-in check valve, and more particularly to a ball valve that is attached to a pipe for water, oil, gas, etc. to open and close the pipe and prevent backflow.

[0002]

[Prior art]

 FIG. 12 is a longitudinal sectional view showing an example of a conventional ball valve with a built-in check valve. In the figure, 21 is a ball valve with a built-in check valve, 22 is a ball valve section, and 23 is a spring lift type check valve. The ball valve with built-in check valve 21 operates a handle 22a to rotate a ball 22b. In addition to the ball valve portion 22 that is opened and closed, the valve body 23a compresses the spring 23b by the flow of the fluid to open the valve during the forward flow, and the valve body 23a closes due to the elastic force of the spring 23b during the reverse flow. It incorporates a spring-type lift type check valve 23 sealed by an elastic seat member 23c mounted on the valve body 23a. The direction indicated by the arrow in the figure is the flow direction of the fluid during normal flow.

[0003]

[Problems to be solved by the device]

 In this structure, when a sudden high-pressure backflow occurs, the valve body 23a is strongly pressed against the valve box 23d of the check valve 23, the elastic seat member 23c is excessively compressed, and the valve body 23a and the valve box 23d are compressed. The valve seat portion may come into strong metal contact and stick to it, and the valve body 23a may not open even when the flow becomes normal. Also, when the downstream side is kept at a pressure much higher than the upstream side for a long time, the elastic sheet member 23c remains in a state of being excessively compressed and deformed. There have been problems such as sticking to the valve seat portion of the box 23d, causing the above-mentioned inconvenience, or permanent deformation of the elastic sheet member 23c to lower the elastic function and impairing the sealing performance.

The ball valve with a built-in check valve according to the present invention is intended to solve the problems of the conventional ball valve with a built-in check valve described above. To prevent excessive compression of the sheet member.

[0005]

[Means for Solving the Problems]

 In order to achieve the above object, the present invention is a ball valve having a built-in check valve, wherein the check valve has an elastic seat member mounted on the valve seat portion, and the valve body is closed when the check valve is closed. Has a structure in which the elastic sheet member is moved until it is appropriately compressed and then stopped. In this case, the check valve is a spring lift type check valve, and a stopper member is installed between the check valve and the ball valve section, and the valve body contacts the stopper member when the check valve is closed. It is preferable that it can be stopped.

Alternatively, the check valve is a spring lift type check valve, and the stopper portion provided on the valve body comes into contact with the stopper portion provided on the valve box of the check valve when the check valve is closed. It is good to be stopped. In this case, it is preferable that the check valve has a cartridge structure in which the valve body and the spring are built in the valve box.

[0007]

[Action]

 Since the ball valve with a built-in check valve according to the present invention is configured as described above, first, the ball valve portion rotates the ball to open and close the flow path. When the ball valve portion is in the open state and the fluid flows to the forward flow side, the fluid flow causes the valve element of the check valve to open by compressing the spring and the fluid flows. At the time of reverse flow, the valve body is closed by the elastic force of the spring, and the reverse flow of fluid is stopped.

In this case, the elastic seat member attached to the valve seat of the valve body or the valve box of the check valve is compressed to seal the valve seat, but the valve body is compressed until the elastic seat member is appropriately compressed. When it moves, the valve body comes into contact with the stopper member inserted between the check valve and the ball valve portion, or the stopper portion provided on the valve body comes into contact with the stopper portion provided on the valve box and stops. You can

For this reason, the elastic seat member of the check valve is excessively compressed and deformed to be damaged, or the excessively compressed and deformed state is continuously deformed particularly in a high temperature state, and the elastic function is deteriorated. Therefore, the sealing performance will not be impaired, and the elastic seat member will not be stuck at the valve seat portion of the valve body and the valve box, thereby making it impossible to open the valve body. Further, the elastic sheet member is extremely compressed and deformed by a water hammer or the like, and the valve body and the valve seat portion of the valve box come into strong metal contact with each other and are fixed, and the valve body does not open at the next forward flow. Does not happen.

When the stopper portion of the check valve is provided between the valve body and the valve box to form a cartridge structure, maintenance work is facilitated and the elastic sheet member is not excessively compressed, so that permanent deformation occurs. Instead, it can be stored for a long time.

[0011]

【Example】

 Next, an embodiment of a ball valve with a built-in check valve of the present invention will be described with reference to the drawings. FIG. 1 is a longitudinal sectional view showing an embodiment of the ball valve with a built-in check valve according to the present invention, showing a state in which the check valve is closed. FIG. 2 is a partial vertical cross-sectional view showing a state in which the check valve of the ball valve with a built-in check valve shown in FIG. 1 is opened. 1 and 2, 1 is a ball valve with a built-in check valve, 2 is a ball valve part, 3 is a lift type check valve, and the ball valve with a built-in check valve 1 operates a handle 2a. In addition to the ball valve portion 2 that opens and closes the ball 2b by rotating it, the valve body 3a compresses the spring 3b by the flow of the fluid to open the valve during normal flow, and the valve body 3a elastically repels the spring 3b during reverse flow. A built-in spring-type lift type check valve 3 is closed by means of an elastic seat member 3c mounted on the valve body 3a and is sealed by an elastic seat member 3c. The direction indicated by the arrow in FIG. 2 is the flow direction of the fluid at the time of forward flow.

Reference numeral 4 denotes a stopper member, which is mounted between the check valve 3 and the ball valve portion 2, and when the check valve 3 is closed, the valve body 3 a appropriately compresses the elastic seat member 3 c. After that, the end portion 3d of the valve element 3a comes into contact with the stopper member 4 and is stopped. FIG. 5 is a side view of the stopper member 4, and 4a is a fluid passage hole. FIGS. 6, 7 and 8 are side views showing other embodiments of the stopper member 4, each having a flow path hole 4a having a different shape, and the shape of the flow path hole 4a can be arbitrarily selected. be able to.

FIGS. 10 and 11 show another example of the embodiment shown in FIG. 1. FIG. 10 shows an engaging portion 3f formed on the valve body 3a in addition to the structure shown in FIG. The engaging portion 3g formed on the valve seat portion of the valve box 3e is engaged and stopped. FIG. 11 shows that when the engaging portion 3f engages with the engaging portion 3g of the valve seat portion. The valve body 3a is stopped, and 4 is a seat holder.

FIG. 3 is a vertical sectional view showing another embodiment of the ball valve with a built-in check valve according to the present invention, showing a state in which the check valve is closed. FIG. 4 is a partial vertical cross-sectional view showing a state in which the check valve of the check valve-equipped ball valve shown in FIG. 3 is opened. The direction indicated by the arrow in FIG. 4 is the flow direction of the fluid at the time of forward flow. In FIGS. 3 and 4, 13 is a spring-type lift check valve, and 14 is not a stopper member but a simple seat holder. 3 and 4, the reference numerals used in FIGS. 1 and 2 are similarly used, but these indicate the same parts. The ball valve 1 with a built-in non-return valve has a ball valve portion 2 that opens and closes by operating a handle 2a to rotate a ball 2b, and at the time of forward flow, a valve body 13a compresses a spring 13b by a fluid flow to open. The valve body 13a is closed by the elastic force of the spring 13b at the time of reverse flow, and a spring-type lift check valve 13 which is sealed by an elastic seat member 13c mounted on the valve body 13a is incorporated.

Reference numeral 13d is a stopper portion provided on the valve body 13a, and 13f is a stopper portion provided on the valve box 13e. The valve body 13a appropriately compresses the elastic seat member 13c when the check valve 13 is closed. After that, the stopper portion 13d of the valve body 13a comes into contact with the stopper portion 13e of the valve box 13f and is stopped.

In the embodiment shown in FIGS. 1 and 2 and the embodiment shown in FIGS. 3 and 4, the elastic seat member 3c is on the valve seat portion of the valve body 3a, and the elastic seat member 13c is on the valve body 13a. The elastic seat member 3c is attached to the valve seat portion of the valve box 3e of the check valve 3 and the elastic seat member 13c is attached to the valve seat portion of the valve box 13e of the check valve 13. May be. The check valve 13 has a cartridge structure.

Next, the operation of each of the above-described embodiments will be described. First, the ball valve portion 2 rotates the ball 2b to open and close the flow path. When the ball valve portion 2 is in the open state and the fluid flows to the forward flow side, the flow of the fluid compresses the valve body 3a of the check valve 3 to the spring 3b, and the valve body 13a of the check valve 13 The spring 13b is compressed to open the valve, and the fluid flows. At the time of reverse flow, the valve body 3a is closed by the elastic force of the spring 3b and the valve body 13a is closed by the elastic force of the spring 13b, and the reverse flow of the fluid is stopped.

In this case, the elastic seat members 3c and 13c are compressed to seal the valve seat portion, but in the embodiment of FIGS. 1 and 2, the valve body 3a moves until the elastic seat member 3c is appropriately compressed. Then, the end portion 3d of the valve body 3a comes into contact with the stopper member 4 and is stopped, and in the embodiment of FIGS. 3 and 4, when the valve body 13a moves until the elastic seat member 13c is appropriately compressed, The stopper portion 13d of the body 13a comes into contact with the stopper portion 13f of the valve box 13e and is stopped.

FIG. 9 is a longitudinal sectional view of a portion showing another embodiment of the check valve-equipped ball valve according to the present invention. Only parts different from the above-described embodiments will be described with reference to FIG. The check valve 3 is built in the body on the primary side of the ball valve portion 2, and has a structure in which a holding member 31 is mounted and a part of the seat holder 30 is used as a stopper portion 3a of the valve body 3a. .

[0020]

[Effect of device]

 Since the ball valve with a built-in check valve according to the present invention is constructed and operates as described above, the elastic seat member of the built-in check valve is excessively compressed and deformed to be damaged or excessively deformed. In this state, permanent deformation occurs, especially at high temperature, and the elastic function deteriorates and the sealing performance is impaired, or the elastic seat member is fixed at the valve seat part of the valve body and the valve box, Does not disable the opening of the. Further, the elastic sheet member is extremely compressed and deformed by a water hammer or the like, and the valve body and the valve seat portion of the valve box come into strong metal contact with each other and are fixed, and the valve body does not open at the next forward flow. Does not happen. Therefore, the ball valve with a built-in check valve of the present invention has high reliability and durability. If the check valve has a stopper structure between the valve body and the valve box, and has a cartridge structure, maintenance work will be facilitated and the elastic seat member will not be excessively compressed so that it will not be permanently deformed. It can be stored for a long time.

[Brief description of drawings]

FIG. 1 is a vertical sectional view showing an embodiment of a ball valve with a check valve according to the present invention.

FIG. 2 is a partial vertical cross-sectional view showing a state where the check valve of the check valve-equipped ball valve shown in FIG. 1 is opened.

FIG. 3 is a vertical sectional view showing another embodiment of the ball valve with a built-in check valve according to the present invention.

FIG. 4 is a partial vertical cross-sectional view showing a state where the check valve of the ball valve with a built-in check valve shown in FIG. 3 is opened.

5 is a side view showing a stopper member of the embodiment shown in FIG. 1. FIG.

FIG. 6 is a side view showing another embodiment of the stopper member of the embodiment shown in FIG.

FIG. 7 is a side view showing another embodiment of the stopper member of the embodiment shown in FIG.

FIG. 8 is a side view showing another embodiment of the stopper member of the embodiment shown in FIG.

FIG. 9 is a partial vertical sectional view showing another embodiment of the ball valve according to the present invention.

10 is a partial vertical cross-sectional view showing another example of FIG.

FIG. 11 is a partial vertical cross-sectional view showing another example of FIG.

FIG. 12 is a vertical cross-sectional view showing an example of a conventional ball valve with a built-in check valve.

[Explanation of symbols]

 1 Ball Valve with Built-in Check Valve 2 Ball Valve Part 3, 13 Check Valve 3a, 13a Valve Body 3b, 13b Spring 3c, 13c Elastic Seat Member 3d End Part 3e, 13e Valve Box 4 Stopper Member 13d, 13f, 30a Stopper Part

Claims (3)

[Scope of utility model registration request] 1. A ball valve having a built-in check valve, comprising:
The check valve has an elastic seat member mounted on the valve seat portion,
A ball valve with a built-in check valve, wherein when the check valve is closed, the valve body is moved until the elastic seat member is appropriately compressed and then stopped. 2. The check valve is a spring lift type check valve, wherein a stopper member is mounted between the check valve and the ball valve portion, and the valve body is closed when the check valve is closed. The ball valve with a built-in check valve according to claim 1, wherein the ball valve is stopped by contacting the stopper member. 3. The check valve is a spring lift type check valve, and a stopper portion provided on the valve body when the check valve is closed is a stopper portion provided on a valve box of the check valve. The ball valve with a built-in check valve according to claim 1, wherein the ball valve is abutted against and stopped.