Valve inner leakage testing and verifying device

Abstract

The utility model discloses a valve inner leakage testing and verifying device which comprises a connecting pipe and a ball valve, and the ball valve is in threaded connection with one end of the connecting pipe. The joint is in threaded connection with one end of the ball valve; the piezometric tube is in threaded connection with one side of the joint; the plug is arranged at one end of the piezometric tube; and the pressure gauge is in threaded connection with the outer wall of the pressure measuring tube. According to the valve inner leakage test and inspection device, the connecting pipe is connected with the blow-down valve of the station, pressure can be visually displayed through the pressure gauge during valve inner leakage detection, natural gas can be slowly and slightly leaked through the plug, a large amount of natural gas is prevented from being discharged, and whether inner leakage exists in the valve or not is judged by observing the pressure change of the pressure gauge.

Description

TECHNICAL FIELD

[0001] The utility model relates to natural gas station equipment technical field, concretely is a valve internal leakage test device. BACKGROUND

[0002] The valve chamber key valve needs to be regularly tested for internal leakage, and the valve needs to be manually opened for sewage valve to carry out valve cavity emptying when doing internal leakage test, and the end of the sewage or emptying pipeline is only provided with a sewage (emptying) nozzle, and only naked eye observation and airflow sound judgment can be used to determine whether internal leakage exists during the valve internal leakage test, the observation is not obvious, and a large amount of natural gas is discharged during the observation process, which causes serious waste and affects the working environment. SUMMARY

[0003] The utility model discloses a valve internal leakage test device, which can solve the problem that naked eye observation and airflow sound judgment can only be used to determine whether internal leakage exists in the prior art, the observation is not obvious, and a large amount of natural gas is discharged during the observation process, which causes serious waste and affects the working environment.

[0004] To achieve the above object, the utility model provides the following technical scheme: a valve internal leakage test device, comprising: a connecting pipe, a ball valve, a joint, a pressure measuring pipe, a plugging and a pressure gauge; the ball valve is screwed with one end of the connecting pipe; the joint is screwed with one end of the ball valve; the pressure measuring pipe is screwed with one side of the joint; the plugging is arranged at one end of the pressure measuring pipe; and the pressure gauge is screwed with the outer wall of the pressure measuring pipe.

[0005] Preferably, the plugging comprises: a pipe plug, which is screwed with one side of the pressure measuring pipe and communicates with the inner cavity of the pressure measuring pipe; a threaded groove is formed in one side of the inner cavity of the pipe plug; a plug head is screwed with the inner cavity of the threaded groove; a sealing gasket is fixedly arranged on one side of the inner cavity of the threaded groove; and the plug head is in extrusion contact with the sealing gasket.

[0006] Preferably, an exhaust hole is formed in the front side of the outer wall of the pipe plug.

[0007] Preferably, the outer wall of the pipe plug and the plug head is rectangular in shape.

[0008] Preferably, the pressure gauge is vertically arranged above the outer wall of the pressure measuring pipe.

[0009] Compared with the prior art, the valve internal leakage test device has the following advantages: the connecting pipe is connected with the sewage valve of the station, the pressure can be directly displayed by the pressure gauge during the valve internal leakage test, the natural gas can be slowly and slightly leaked by the plug head, the discharge of a large amount of natural gas is avoided, and whether the valve has internal leakage can be determined by observing the pressure change of the pressure gauge. BRIEF DESCRIPTION OF DRAWINGS

[0010] Fig. 1 It is a structural schematic view of the utility model;

[0011] Fig. 2 It is an assembly structural schematic view of the pressure measuring pipe of the utility model;

[0012] Fig. 3 It is a front view of the pressure measuring pipe of the utility model.

[0013] In the drawing: 1, connecting pipe; 2, ball valve; 3, joint; 4, pressure measuring pipe; 5, plugging; 51, pipe plug; 52, plug; 53, threaded groove; 54, sealing washer; 55, exhaust hole; 6, pressure gauge. DETAILED DESCRIPTION

[0014] The technical scheme in the embodiments of the utility model will be apparently and completely described below with the drawings in the embodiments of the utility model, and obviously, the described embodiments are only part of the embodiments of the utility model, rather than all the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by the person skilled in the art without creative labor belong to the protection scope of the utility model.

[0015] Please refer to Figs. 1-3 The utility model provides a technical scheme: a valve inner leakage test device, which comprises a connecting pipe 1, a ball valve 2, a joint 3, a pressure measuring pipe 4, a plugging 5 and a pressure gauge 6.

[0016] The ball valve 2 is screwed with one end of the connecting pipe 1, the joint 3 is screwed with one end of the ball valve 2, the pressure measuring pipe 4 is screwed with one side of the joint 3, the plugging 5 is arranged at one end of the pressure measuring pipe 4, and the pressure gauge 6 is screwed with the outer wall of the pressure measuring pipe 4.

[0017] As a preferred scheme, further, the plugging 5 comprises a pipe plug 51, a plug 52, a threaded groove 53, a sealing washer 54 and an exhaust hole 55.

[0018] In order to mechanically seal one end of the pressure measuring pipe 4, the pipe plug 51 is screwed with one side of the pressure measuring pipe 4, and the inner cavity of the pipe plug 51 communicates with the inner cavity of the pressure measuring pipe 4, the inner cavity of the pipe plug 51 is provided with the threaded groove 53 on one side, the plug 52 is screwed with the inner cavity of the threaded groove 53, the sealing washer 54 is fixedly arranged on one side of the inner cavity of the threaded groove 53, and the plug 52 is in extrusion contact with the sealing washer 54, and the sealing washer 54 can improve the sealing effect between the plug 52 and the pipe plug 51.

[0019] As a preferred scheme, further, the outer wall of the pipe plug 51 is provided with the exhaust hole 55 on the front side.

[0020] As a preferred scheme, further, the outer wall of the pipe plug 51 and the plug 52 is rectangular in shape on one side, so as to facilitate the rotation of the pipe plug 51 and the plug 52.

[0021] As a preferred option, the pressure gauge 6 is further positioned vertically above the outer wall of the pressure measuring tube 4 to facilitate observation of pressure fluctuations.

[0022] Its detailed connection method is a well-known technology in this field. The following mainly introduces the working principle and process, and the specific work is as follows.

[0023] After installation, with ball valve 2 in the closed position, release the gas pressure in the cavity by 1-2 MPa (taking the main line operating pressure of 8 MPa as an example, directly reduce it to 6 MPa or 7 MPa). After leak testing, continuously observe the changes in pressure gauge 6. If there is no pressure fluctuation in pressure gauge 6 within 15-30 minutes, it proves that the valve does not have internal leakage. If the pressure continues to rise to the main line pressure, it proves that the ball valve has internal leakage. The value can be read directly by observing pressure gauge 6, and the internal leakage status of the valve can be judged based on the pressure fluctuation.

[0024] During the internal leakage test of valves in the station and valve chamber, when the DN350 bypass valve in the valve chamber of the Zhonggui trunk line is vented, a large amount of natural gas will accumulate in the valve chamber. When venting, rotate the plug 52 to separate the plug 52 from the sealing gasket 54 until it moves to the side of the vent hole 55, so that the natural gas can be slowly discharged through the vent hole 55. This reduces the amount of natural gas vented from the valve chamber, which can reduce the safety risks of valve chamber fire and explosion. The small amount of natural gas released by the valve can dissipate in a short time under good ventilation, reducing the risk of poisoning and suffocation of personnel in confined spaces and ensuring the personal safety of operators.

[0025] The original procedure for testing valve internal leakage was to vent the natural gas in the valve cavity to 0MPa and then repeatedly operate the drain (vent) valve to perform a pressure test to determine whether the valve had internal leakage.

[0026] After using this device, the gas pressure inside the cavity can be released by 1-2 MPa (taking the operating pressure of the Zhonggui trunk line of 8 MPa as an example, it can be directly reduced to 7 MPa). By reading the pressure on pressure gauge 6, it can be determined whether the valve is leaking internally. At the same time, this method will reduce the venting volume to about 10% of the original venting volume. Taking a DN1000 valve as an example: the valve cavity capacity is about 104 Nm³. After installing the tool, only about 10 Nm³ of natural gas needs to be released, which can directly avoid the waste of nearly 94 Nm³ of natural gas.

[0027] Currently, valve internal leakage testing requires repeated operation of the drain valve to pressurize after the valve chamber is vented in order to confirm the internal leakage status. Taking the Zhonggui trunk line valve chamber as an example, the internal leakage test time for two DN350 ball valves (process switching, valve operation, venting, natural gas diffusion, drain valve operation) takes about 1-1.5 hours (depending on the size of the vent valve). The operation time is long, and the operators are in a confined space containing flammable gas for a long time or frequently.

[0028] After using this device, the presence of internal leakage in the valve can be determined directly by observing the pressure fluctuation after the initial pressure release. Taking the Zhonggui trunk line valve chamber as an example, the internal leakage test time for two DN350 ball valves is only about 0.5 hours, saving time and effort. At the same time, it reduces the repeated operation of operators, reducing the risk of mechanical injury to personnel; it also reduces the frequent operation of equipment accessories, reducing equipment wear and tear and failure rate.

[0029] 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, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A valve internal leakage testing and inspection device, characterized in that, include: Takeover (1); The ball valve (2) is screwed to one end of the connecting pipe (1); The connector (3) is screwed to one end of the ball valve (2); The pressure measuring tube (4) is screwed to one side of the connector (3); A plug (5) is installed at one end of the pressure measuring tube (4); The pressure gauge (6) is screwed to the outer wall of the pressure measuring tube (4).

2. The valve internal leakage testing and inspection device according to claim 1, characterized in that: The sealing (5) includes: A plug (51) is screwed to one side of the pressure measuring tube (4), and the plug (51) communicates with the inner cavity of the pressure measuring tube (4); The plug (52) has a threaded groove (53) on one side of the inner cavity of the tube plug (51), and the plug (52) is screwed into the inner cavity of the threaded groove (53). A sealing gasket (54) is fixedly disposed on one side of the inner cavity of the threaded groove (53), and the plug (52) is in contact with the sealing gasket (54) by compression.

3. The valve internal leakage testing and inspection device according to claim 2, characterized in that: The outer wall of the plug (51) is provided with an exhaust hole (55).

4. The valve internal leakage testing and inspection device according to claim 3, characterized in that: The outer wall of both the plug (51) and the end cap (52) is rectangular.

5. The valve internal leakage testing and inspection device according to claim 1, characterized in that: The pressure gauge (6) is vertically positioned directly above the outer wall of the pressure measuring tube (4).

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