Testing device for online detection of inner leakage of valve

Abstract

The utility model provides a testing device for on-line detection of inner leakage of a valve, which comprises a pressure transmitter, a pressure relief needle valve and a pressure tapping needle valve, and the pressure tapping needle valve is respectively connected with the pressure transmitter and the pressure relief needle valve through pipelines. The pressure transmitter is used for displaying pressure changes, the pressure relief needle valve is used for relieving pressure before the test device is disassembled, and the pressure tapping needle valve is used for communicating the valve with the pressure transmitter. The pressure transmitter is used for displaying the pressure change to test whether the high-pressure valve leaks internally or not. And after the detection is finished, the pressure relief needle valve is used for pressure relief, and then the testing device is disassembled. The device is safe, economical, convenient and capable of improving working efficiency. The original structure of equipment is not damaged, excessive gas in the valve does not need to be discharged, and the valve can be used outdoors and in a closed space.

Description

Technical Field

[0001] The utility model relates to the technical field of valve detection equipment for natural gas compressor stations, in particular to a test device for on-line detection of valve internal leakage. Background Art

[0002] During the operation of natural gas stations, it is required that pipeline valves have good sealing performance and there should be no internal leakage. Once there is internal leakage, it will seriously threaten the safe operation of natural gas pipelines. It is relatively difficult to detect valve internal leakage. Currently, commonly used acoustic emission detection, ultrasonic detection, etc. are greatly affected by the environment, with complex operations and high costs. In addition, judging whether there is internal leakage by whether air or liquid can be discharged from the valve cavity will cause a large amount of natural gas waste. Summary of the Utility Model

[0003] The technical problem to be solved by the utility model is to provide a test device for on-line detection of valve internal leakage in view of the deficiencies of the prior art.

[0004] The technical solution of the utility model to solve the above technical problem is as follows: A test device for on-line detection of valve internal leakage includes: a pressure transmitter, a pressure relief needle valve, and a pressure tapping needle valve. The pressure tapping needle valve is connected to the pressure transmitter and the pressure relief needle valve respectively through pipelines.

[0005] The beneficial effect of adopting the technical solution of the utility model is: The pressure transmitter is used to display the pressure change. The pressure relief needle valve is used to relieve pressure before disassembling the test device. The pressure tapping needle valve is used to connect the valve and the pressure transmitter. By the pressure transmitter displaying the pressure change, it is tested whether the high-pressure valve has internal leakage. After the detection is completed, the test device is disassembled after relieving pressure through the pressure relief needle valve. It is safe, energy-saving, convenient and can improve work efficiency. It does not damage the original structure of the equipment, and does not require excessive venting of the gas inside the valve. It can be used for valves in outdoor and enclosed spaces.

[0006] Further, one end of the pressure tapping needle valve is connected with a conversion joint through a pipeline, and the other end of the pressure tapping needle valve is connected to the pressure transmitter and the pressure relief needle valve respectively through pipelines.

[0007] The beneficial effect of adopting the above further technical solution is: The conversion joint can be suitable for high-pressure valves of different sizes. Ball valves of different types of high-pressure valves can be connected to the pressure tapping needle valve through conversion joints of different sizes.

[0008] Further, the conversion joint is connected with a ball valve through a pipeline.

[0009] The beneficial effect of adopting the above further technical solution is: It is convenient to control the opening and closing of the pipeline between the test device for on-line detection of valve internal leakage and the valve to be tested through the ball valve.

[0010] Further, the adapter is adapted to the ball valve.

[0011] The beneficial effect of adopting the above further technical solution is that: the adapter can be applied to high-pressure valves of different sizes. The ball valves of different types of high-pressure valves can be connected to the pressure-taking needle valve through adapters of different sizes.

[0012] Further, the ball valve is connected with a vent joint through a pipeline.

[0013] The beneficial effect of adopting the above further technical solution is that: it is convenient to control the opening and closing of the pipeline between the on-line test device for detecting valve internal leakage and the valve to be tested through the ball valve.

[0014] Further, the ball valve and the vent joint are installed on the valve to be tested.

[0015] The beneficial effect of adopting the above further technical solution is that: it is convenient to control the opening and closing of the pipeline between the on-line test device for detecting valve internal leakage and the valve to be tested through the ball valve.

[0016] Further, a pressure display device is provided on the pressure transmitter.

[0017] The beneficial effect of adopting the above further technical solution is that: it is convenient for users to directly observe the pressure change.

[0018] Further, the pressure-taking needle valve is connected to the pressure transmitter through a pipeline, and the pressure-relief needle valve is connected to the pipeline between the pressure-taking needle valve and the pressure transmitter through a pipeline.

[0019] The beneficial effect of adopting the above further technical solution is that: the pressure-relief needle valve is used for pressure relief before disassembling the test device, improving the stability and reliability of the device.

[0020] Further, a tee joint is provided on the pipeline between the pressure-taking needle valve and the pressure transmitter. The pressure-taking needle valve is connected to the first end of the tee joint through a pipeline, the pressure transmitter is connected to the second end of the tee joint through a pipeline, and the pressure-relief needle valve is connected to the third end of the tee joint through a pipeline.

[0021] The beneficial effect of adopting the above further technical solution is that: connecting the pressure-taking needle valve, the pressure transmitter and the pressure-relief needle valve through the tee joint is convenient for the installation and maintenance of the device.

[0022] Further, the pressure transmitter is an explosion-proof pressure transmitter.

[0023] The beneficial effect of adopting the above further technical solution is that: the pressure transmitter is an explosion-proof pressure transmitter, improving the stability and reliability of the device.

[0024] Advantages of additional aspects of the present utility model will be partly given in the following description, partly will become apparent from the following description, or will be learned through the practice of the present utility model. Brief Description of the Drawings

[0025] Figure 1 It is a schematic structural diagram of a test device for on-line detection of valve internal leakage provided for an embodiment of the present utility model.

[0026] Explanation of reference numerals in the drawings: 1, pressure transmitter; 2, pressure relief needle valve; 3, pressure tapping needle valve; 4, adapter; 5, ball valve; 6, vent connection. Specific Embodiments

[0027] The principles and features of the present utility model will be described below in conjunction with the accompanying drawings. The examples given are only used to explain the present utility model and are not intended to limit the scope of the present utility model.

[0028] As Figure 1 shown, an embodiment of the present utility model provides a test device for on-line detection of valve internal leakage, including: a pressure transmitter 1, a pressure relief needle valve 2, and a pressure tapping needle valve 3. The pressure tapping needle valve 3 is connected to the pressure transmitter 1 and the pressure relief needle valve 2 respectively through pipelines.

[0029] The beneficial effects of adopting the technical solution of the present utility model are: the pressure transmitter is used to display the pressure change, the pressure relief needle valve is used to relieve pressure before disassembling the test device, and the pressure tapping needle valve is used to connect the valve and the pressure transmitter. By using the pressure transmitter to display the pressure change, it is tested whether the high-pressure valve has internal leakage. After the detection is completed, the test device is disassembled after relieving pressure through the pressure relief needle valve. It is safe, economical, convenient and can improve work efficiency. It does not damage the original structure of the equipment, and does not require excessive venting of the gas inside the valve. It can be used for valves in outdoor and enclosed spaces.

[0030] An embodiment of the present utility model provides a test device for on-line detection of valve internal leakage, which can be a test device for on-line detection of high-pressure valve internal leakage, aiming to provide a test device that is safe, economical, convenient and can improve work efficiency, belonging to the technical field of valve internal leakage detection. The ball valve 5 is connected to the vent connection 6 of the valve body. The other end of the ball valve 5 is connected to the pressure tapping needle valve 3 through an adapter 4. The other end of the pressure tapping needle valve 3 is respectively connected to the pressure relief needle valve 2 and the pressure transmitter 1. This device (the test device for on-line detection of valve internal leakage) tests whether the high-pressure valve has internal leakage by using the pressure transmitter to display the pressure change. After the detection is completed, the ball valve is closed, and the test device (the test device for on-line detection of valve internal leakage) is disassembled after relieving pressure through the pressure relief needle valve. This test device has the characteristics of simple operation, safety and reliability, and can significantly improve work efficiency. Through the adapter 4, it can be applied to high-pressure valves of different sizes, does not damage the original structure of the equipment, and does not require excessive venting of the gas inside the valve. It can be used for valves in outdoor and enclosed spaces and is suitable for popularization and application.

[0031] An on-line leakage detection test device for a valve provided by an embodiment of the present utility model can be an on-line leakage detection test device for a high-pressure valve, including a pressure transmitter 1, a pressure relief needle valve 2, a pressure tapping needle valve 3, a conversion joint 4, a ball valve 5, and a vent joint 6. The ball valve and the vent joint are installed at the valve body interface. The pressure transmitter 1 is used to accurately display the pressure change. The pressure relief needle valve 2 is used to relieve the pressure before disassembling the test device. The pressure tapping needle valve 3 is used to connect the valve and the pressure transmitter 1. The ball valve 5 and the vent joint 6 are installed at the valve body interface. One end of the conversion joint 4 is connected to the ball valve 5, and the other end is connected to the pressure tapping needle valve 3. The other end of the pressure tapping needle valve 3 is respectively connected to the pressure relief needle valve 2 and the pressure transmitter 1. Open the ball valve to observe the pressure change of the pressure transmitter and judge whether the valve leaks internally. After the test is completed, close the ball valve and relieve the pressure through the pressure relief needle valve.

[0032] The ball valves 5 of different types of high-pressure valves can be connected to the pressure tapping needle valve 3 through conversion joints 4 of different sizes.

[0033] The pressure tapping needle valve 3 is connected to the pressure relief needle valve 2 and the pressure transmitter 1 at the same time, which can achieve safe operation.

[0034] The pressure transmitter is an explosion-proof, high-precision intelligent pressure transmitter. The pressure transmitter 1 can directly read the value, has a high precision, and can judge the severity of the internal leakage of the valve.

[0035] Connect to the pressure tapping needle valve, pressure relief needle valve and pressure transmitter through the conversion joint, and directly detect the pressure change in the valve cavity of the valve through the pressure transmitter. It can quickly detect the internal leakage of the valve and its severity without emptying the valve. By extending the pressure relief pipe, it can be applied to a confined space. In addition, the on-line leakage detection test device for a high-pressure valve (the on-line leakage detection test device for a valve) in the embodiment of the present utility model is simple to operate, safe and reliable, time-saving and labor-saving, and can significantly improve the work efficiency.

[0036] As Figure 1 shown, further, one end of the pressure tapping needle valve 3 is connected to a conversion joint 4 through a pipeline, and the other end of the pressure tapping needle valve 3 is respectively connected to the pressure transmitter 1 and the pressure relief needle valve 2 through pipelines.

[0037] The beneficial effect of adopting the above further technical solution is that it can be applicable to high-pressure valves of different sizes through the conversion joint. The ball valves of different types of high-pressure valves can be connected to the pressure tapping needle valve through conversion joints of different sizes.

[0038] As Figure 1 shown, further, the conversion joint 4 is connected to a ball valve 5 through a pipeline.

[0039] The beneficial effects of adopting the above further technical solution are as follows: It is convenient to control the opening and closing of the pipeline between the on-line test device for detecting valve internal leakage and the valve to be tested through the ball valve.

[0040] As Figure 1 shown, further, the adapter 4 is adapted to the ball valve 5.

[0041] The beneficial effects of adopting the above further technical solution are as follows: Through the adapter, it can be applicable to high-pressure valves of different sizes. The ball valves of different types of high-pressure valves can be connected to the pressure-taking needle valve through adapters of different sizes.

[0042] As Figure 1 shown, further, the ball valve 5 is connected with a vent joint 6 through a pipeline.

[0043] The beneficial effects of adopting the above further technical solution are as follows: It is convenient to control the opening and closing of the pipeline between the on-line test device for detecting valve internal leakage and the valve to be tested through the ball valve.

[0044] As Figure 1 shown, further, the ball valve 5 and the vent joint 6 are installed on the valve to be tested.

[0045] The beneficial effects of adopting the above further technical solution are as follows: It is convenient to control the opening and closing of the pipeline between the on-line test device for detecting valve internal leakage and the valve to be tested through the ball valve.

[0046] As Figure 1 shown, further, a pressure display device is provided on the pressure transmitter 1.

[0047] The beneficial effects of adopting the above further technical solution are as follows: It is convenient for users to visually observe the pressure change.

[0048] As Figure 1 shown, further, the pressure-taking needle valve 3 is connected with the pressure transmitter 1 through a pipeline, and the pressure-relief needle valve 2 is connected with the pipeline between the pressure-taking needle valve 3 and the pressure transmitter 1 through a pipeline.

[0049] The beneficial effects of adopting the above further technical solution are as follows: The pressure-relief needle valve is used for pressure relief before disassembling the test device, improving the stability and reliability of the device.

[0050] As Figure 1 shown, further, a tee joint is provided on the pipeline between the pressure-taking needle valve 3 and the pressure transmitter 1. The pressure-taking needle valve 3 is connected with the first end of the tee joint through a pipeline, the pressure transmitter 1 is connected with the second end of the tee joint through a pipeline, and the pressure-relief needle valve 2 is connected with the third end of the tee joint through a pipeline.

[0051] The beneficial effects of adopting the above further technical solution are as follows: By connecting the pressure tapping needle valve, the pressure transmitter, and the pressure relief needle valve through a tee, it is convenient for the installation and maintenance of the device.

[0052] Further, the pressure transmitter 1 is an explosion-proof pressure transmitter.

[0053] The beneficial effects of adopting the above further technical solution are as follows: The pressure transmitter is an explosion-proof pressure transmitter, which improves the stability and reliability of the device.

[0054] Refer to Figure 1 , an on-line leakage detection test device for high-pressure valves (a test device for on-line leakage detection of valves), including a pressure transmitter 1, a pressure relief needle valve 2, a pressure tapping needle valve 3, a conversion joint 4, a ball valve 5, and a vent joint 6. The ball valve 5 is connected to the pressure tapping needle valve 3 through the conversion joint 4, and the outer end of the pressure tapping needle valve 3 is connected to the pressure relief needle valve 2 and the pressure transmitter 1.

[0055] As Figure 1 shown, after the test device is connected, open the ball valve 5. The displayed pressure value is the pressure in the valve cavity of the valve to be tested (the valve under test). By observing the pressure change displayed by the pressure transmitter 1, it is possible to test whether the high-pressure valve leaks internally. If the reading increases, it indicates that the valve leaks internally. The degree of internal leakage can be judged according to the rising speed of the value. If the pressure remains unchanged, it indicates that the valve does not leak internally. After the detection is completed, close the ball valve 5 and disassemble the test device after relieving the pressure through the pressure relief needle valve 2.

[0056] If testing a valve in a confined space, extend the pressure relief pipe of the pressure relief needle valve 2 to the atmospheric environment to ensure safe and reliable operation.

[0057] Finally, it should be noted that: The above embodiments are only used to illustrate the technical solutions of the present invention, and are not intended to limit them; Although the present invention has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that: They can still modify the technical solutions recorded in the foregoing embodiments, or perform equivalent replacements on some or all of the technical features; And these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A test device for online detection of valve internal leakage, characterized in that: include: A pressure transmitter, a pressure relief needle valve and a pressure taking needle valve, wherein the pressure taking needle valve is respectively connected to the pressure transmitter and the pressure relief needle valve through pipelines; one end of the pressure taking needle valve is connected to a conversion joint through a pipeline, and the other end of the pressure taking needle valve is respectively connected to the pressure transmitter and the pressure relief needle valve through pipelines.

2. A test device for online detection of valve internal leakage according to claim 1, characterized in that: The conversion joint is connected with a ball valve through a pipeline.

3. A test device for online detection of valve internal leakage according to claim 2, characterized in that: The conversion joint is adapted to the ball valve.

4. The testing device for online detection of valve internal leakage according to claim 2, characterized in that: The ball valve is connected with a venting joint through a pipeline.

5. The testing device for online detection of valve internal leakage according to claim 4, characterized in that: The ball valve and the vent joint are installed on the valve to be tested.

6. The testing device for online detection of valve internal leakage according to claim 1, characterized in that: The pressure transmitter is provided with a pressure display device.

7. The testing device for online detection of valve internal leakage according to claim 1, characterized in that: The pressure-taking needle valve is connected to the pressure transmitter through a pipeline, and the pressure-releasing needle valve is connected to the pipeline between the pressure-taking needle valve and the pressure transmitter through a pipeline.

8. The testing device for online detection of valve internal leakage according to claim 7, characterized in that: A tee is provided on the pipeline between the pressure needle valve and the pressure transmitter, the pressure needle valve is connected to the first end of the tee through the pipeline, the pressure transmitter is connected to the second end of the tee through the pipeline, and the pressure relief needle valve is connected to the third end of the tee through the pipeline.

9. The testing device for online detection of valve internal leakage according to claim 1, characterized in that: The pressure transmitter is an explosion-proof pressure transmitter.

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