CN114894402A - A large ball valve cavity venting drainage and charging device - Google Patents

Abstract

The invention discloses a valve cavity emptying drainage and pressurization device for a large ball valve, which comprises two valve groups, a pressure gauge and a first joint, wherein the top of each valve group is in threaded connection with the bottom of the pressure gauge, the bottom of each valve group is fixedly communicated with a tee, one side of the tee is fixedly communicated with the first joint through threads, the other side of the tee is fixedly communicated with an isolation ball valve through threads, the other side of the isolation ball valve is fixedly communicated with a high-pressure hose through threads, one end of the high-pressure hose, far away from the isolation ball valve, is fixedly communicated with a second joint through threads, and the other side of the second joint is fixedly communicated with an emptying pipe. According to the invention, through the matched use of the two valve groups, the pressure gauge, the first joint, the isolation ball valve, the high-pressure hose and the second joint, the risk potential danger in the daily maintenance and detection process of the ball valve can be effectively eliminated. The operation risk is reduced, and the ball valve maintenance quality and efficiency are improved.

Description

A large ball valve cavity venting drainage and charging device

technical field

The invention belongs to the technical field of valve cavity venting, and in particular relates to a large-scale ball valve valve cavity venting, drainage and charging device.

Background technique

Trunk cut-off gas-liquid linkage ball valve is widely used in key parts such as West-East Gas Pipeline and entry and exit stations due to its good sealing performance. This kind of double cut-off ball valve may cause internal leakage during long-term use or improper maintenance. It is usually necessary to close the valve to exhaust the pressure of the valve cavity to judge whether the sealing performance of the valve is in good condition. At the same time, due to the large volume of the valve cavity, during the venting test, the venting amount is large. If the vented natural gas is not drained, it will lead to the accumulation of natural gas, and there is a great potential safety hazard.

After the valve cavity is emptied, the pressure difference between the upstream and downstream of the valve seat can reach more than 9MPa, and the huge pressure difference acts on the valve seat, which causes the valve to generate huge torque during the opening and closing process, and at the same time generates huge frictional force on the soft seal of the valve seat. There is a certain damage to the valve seat seal, and there is also a situation where the valve cannot be opened due to excessive pressure difference. In order to ensure the safety and control of valve maintenance operations and reduce valve seat damage caused by unreasonable differential pressure, a large ball valve cavity was invented. Vent drainage and charging device.

SUMMARY OF THE INVENTION

In view of the problems existing in the prior art, the present invention provides a large-scale ball valve cavity venting and drainage and charging device, which has the advantages of venting, drainage and charging, and solves the problem of the pressure difference between the upstream and downstream of the valve seat after the existing valve cavity is emptied. It can reach more than 9MPa, and the huge pressure difference acts on the valve seat, which causes the valve to generate huge torque during the opening and closing process, and at the same time generates huge frictional force on the valve seat soft seal, which has certain damage to the valve seat seal. The problem that the valve cannot be opened if the difference is too large.

The present invention is realized in this way, a large-scale ball valve valve cavity venting, drainage and pressure charging device includes two valve groups, a pressure gauge and a first joint. The top of the two valve groups is threadedly connected to the bottom of the pressure gauge. A tee is fixedly communicated with the bottom of the valve block, one side of the tee is threadedly connected with the first joint, the other side of the tee is threadedly connected with an isolation ball valve, and the other side of the isolation ball valve is threadedly connected There is a high-pressure hose, one end of the high-pressure hose away from the isolation ball valve is threadedly connected with a second joint, and the other side of the second joint is fixedly connected with a vent pipe.

Preferably in the present invention, the top of the surface of the venting pipe is provided with threads, the bottom of the venting pipe is provided with a support seat, and the cross-sectional area of the support seat is larger than that of the venting pipe.

Preferably, the surface of the venting pipe is provided with three brackets, the tops of the three brackets and the surface of the venting tube are detachably assembled, and the bottom of the brackets is provided with a backing plate.

As a preferred embodiment of the present invention, the charging device includes a two-valve group, a pressure gauge and a first joint, an isolation ball valve, a high-pressure hose and a second joint, the two-valve group, the pressure gauge and the first joint, the isolation ball valve and the The connection method of the high-pressure hose is the same as above, and the other side of the second joint is communicated with the own equipment of the pipeline.

Compared with the prior art, the beneficial effects of the present invention are as follows:

1. The present invention can effectively eliminate the hidden risks in the routine maintenance and inspection process of the ball valve by setting up two valve groups, a pressure gauge, a first joint, an isolation ball valve, a high-pressure hose and a second joint. Reduce operational risks and improve ball valve maintenance quality and efficiency.

2. By setting the first joint and the second joint in the present invention, the joint and the ball valve can be used to vent or connect the sewage pipeline, and the natural gas can be led out of the valve room or the safe area outside the station through the high-pressure hose and the portable vent pipe. In order to vent a large amount of natural gas accumulation in situ.

3. The present invention can inject nitrogen into the valve cavity through the high pressure hose, balance the pressure of the valve cavity and the upstream and downstream pipelines, reduce the risk that the valve cannot be opened, and reduce the friction damage to the valve seat seal caused by the forced switch.

Description of drawings

1 is a schematic diagram of venting and drainage provided by an embodiment of the present invention;

FIG. 2 is a schematic diagram of a valve cavity pressurization provided by an embodiment of the present invention.

In the figure: 1. Second valve group; 2. Pressure gauge; 3. First joint; 4. Isolation ball valve; 5. High pressure hose; 6. Second joint; 7. Vent pipe; 8. Bracket.

Detailed ways

In order to further understand the content, features and effects of the present invention, the following embodiments are exemplified and described in detail below with the accompanying drawings.

The structure of the present invention will be described in detail below with reference to the accompanying drawings.

Example 1

As shown in FIG. 1 , a large-scale ball valve valve cavity venting, drainage and charging device provided by the embodiment of the present invention includes a two valve group 1, a pressure gauge 2 and a first joint 3, and the first joint 3 is a 1-inch NPT thread high pressure The top of the second valve group 1 is threadedly connected to the bottom of the pressure gauge 2, the bottom of the second valve group 1 is fixedly connected with a tee, one side of the tee is fixedly connected with the first joint 3, and the other side of the tee is threadedly fixed The isolation ball valve 4 is connected, and the isolation ball valve 4 is a one-inch isolation ball valve 4. The other side of the isolation ball valve 4 is threadedly connected with a high-pressure hose 5. The high-pressure hose 5 is a high-pressure rubber hose, and the high-pressure hose 5 is far away from the isolation ball valve 4. One end is threadedly connected with a second joint 6, the second joint 6 is a 1-inch NPT threaded high-pressure joint, and the other side of the second joint 6 is fixedly connected with a vent pipe 7.

Referring to FIG. 1 , the top of the surface of the venting pipe 7 is threaded, and the bottom of the venting pipe 7 is provided with a support seat, and the cross-sectional area of the support seat is larger than that of the venting pipe 7 .

By adopting the above solution, the lengthening of the venting pipe 7 can be facilitated, the venting pipe 7 can be conveniently supported by the arrangement of the support seat, and the sinking height of the venting pipe 7 can be reduced at the same time.

Referring to FIG. 1 , three brackets 8 are provided on the surface of the venting tube 7 , the tops of the three brackets 8 are detachably assembled with the surface of the venting tube 7 , and the bottom of the brackets 8 is provided with a backing plate.

By adopting the above solution, the venting pipe 7 can be acted as an auxiliary support, so that the venting pipe 7 can be prevented from tilting, and the stability of the venting pipe 7 can be increased.

After the connection between the device and the valve is completed, open the 1-inch isolation ball valve 4 for venting. During the venting process, the residual pressure of the valve cavity can be monitored at any time through the pressure gauge 2 on the device until the valve cavity pressure drops to 0, and the valve cavity is closed after the venting is completed. 1-inch isolation ball valve 4, you can judge whether the valve is leaking by observing the change of the high-precision pressure gauge 2.

Embodiment 2

As shown in FIG. 2 , a large-scale ball valve valve cavity venting and drainage and charging device provided by the embodiment of the present invention includes a second valve group 1 , a pressure gauge 2 and a first joint 3 , the top of the second valve group 1 and the pressure gauge 2 The bottom of the tee is threadedly connected, the bottom of the second valve group 1 is fixedly connected with a tee, one side of the tee is threadedly connected with the first joint 3, and the other side of the tee is threadedly connected with an isolation ball valve 4, and the other side of the isolation ball valve 4 is threadedly connected. A high-pressure hose 5 is fixedly connected to the side thread, and one end of the high-pressure hose 5 away from the isolation ball valve 4 is fixedly connected to a second joint 6, and the other side of the second joint 6 is connected to the own equipment of the pipeline.

After the operation is over, in order to cause the pressure difference between the valve cavity and the pipeline is too large, resulting in excessive valve switching torque or even damage to the valve, connect the second joint 6 of the device to the pressure pipe interface on the pipeline, and reverse the valve cavity. Charge the pressure, balance the valve cavity and pipeline pressure, and ensure the normal opening and closing of the valve.

It should be noted that, in this document, relational terms such as first and second are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any relationship between these entities or operations. any such actual relationship or sequence exists. Moreover, the terms "comprising", "comprising" or any other variation thereof are intended to encompass a non-exclusive inclusion such that a process, method, article or device that includes a list of elements includes not only those elements, but also includes not explicitly listed or other elements inherent to such a process, method, article or apparatus.

Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, and substitutions can be made in these embodiments without departing from the principle and spirit of the invention and modifications, the scope of the present invention is defined by the appended claims and their equivalents.

Claims (4)

1. The utility model provides a large-scale ball valve chamber unloading drainage device, includes two valves (1), manometer (2) and first joint (3), its characterized in that: the top of two valves (1) and the bottom threaded connection of manometer (2), the fixed intercommunication in bottom of two valves (1) has the tee bend, three-way one side and first joint (3) thread tightening intercommunication, three-way opposite side thread tightening intercommunication has isolation ball valve (4), the opposite side thread tightening intercommunication of isolation ball valve (4) has high-pressure hose (5), the one end thread tightening intercommunication that keeps away from isolation ball valve (4) in high-pressure hose (5) has second joint (6), the fixed intercommunication of opposite side of second joint (6) has blow-down pipe (7).

2. The large ball valve cavity emptying drainage device of claim 1, wherein: the top of the surface of the emptying pipe (7) is provided with threads, the bottom of the emptying pipe (7) is provided with a supporting seat, and the cross-sectional area of the supporting seat is larger than that of the emptying pipe (7).

3. The large ball valve cavity venting, draining and pressurizing device of claim 1, wherein: the surface of blow-down pipe (7) is provided with three support (8), and is three the top of support (8) is detachable assembly with the surface of blow-down pipe (7), the bottom of support (8) is provided with the backing plate.

4. The large ball valve cavity pressurizing device as set forth in claim 1, wherein: the pressurizing device comprises two valve groups (1), a pressure gauge (2), a first joint (3), an isolation ball valve (4), a high-pressure hose (5) and a second joint (6), the connection modes of the two valve groups (1), the pressure gauge (2), the first joint (3), the isolation ball valve (4) and the high-pressure hose (5) are consistent as above, and the other side of the second joint (6) is communicated with the pipeline self-contained equipment.

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