Ball valve inner leakage detection system

Abstract

The utility model provides a ball valve inner leakage detection system, which comprises a tracer medium storage tank, a first pump body used for conveying tracer medium and a ball valve, the tracer medium storage tank is connected with the first pump body through a pipeline, at least one ball valve channel is arranged in the ball valve, and the tracer medium storage tank is connected with the first pump body through a pipeline. The first pump body is connected with the ball valve channel through a pipeline. The inner leakage condition of the valve seat of the buried earth valve is detected and judged by adopting a mode of supplementing a tracing medium and adding a special channel. The inner leakage detection of the supplementary tracing medium and the structural characteristics of the ball valve are combined, and the grease injection channel of the ball valve is used as an injection channel of the supplementary tracing medium. And the inner leakage position of the valve seat of the buried earth valve can be accurately judged.

Description

TECHNICAL FIELD

[0001] The utility model relates to ball valve leakage detection technical field especially relates to a ball valve internal leakage detection system. BACKGROUND

[0002] Natural gas pipeline every interval will be provided with valve chamber or valve well, and the pipeline trunk valve in the valve chamber or valve well is mostly buried earth valve. Because the valve body of the buried earth valve is completely buried in the soil below the ground, the internal leakage detection of the buried earth valve has been an industry problem, especially the judgment of which side (upstream side or downstream side) of the valve seat internal leakage has not been economically efficient technology. SUMMARY

[0003] The utility model relates to a ball valve internal leakage detection system which solves the technical problems of the prior art.

[0004] The utility model discloses a ball valve internal leakage detection system, which comprises a tracer medium storage tank, a first pump body for conveying the tracer medium and a ball valve.

[0005] The utility model discloses a ball valve internal leakage detection system which solves the technical problems of the prior art.

[0006] Further, a second pump body for conveying the tracer medium is connected to the pipeline between the first pump body and the ball valve channel, and a tracer medium recovery tank is connected to the second pump body through a pipeline.

[0007] When the detection method of the tracer medium supplementing and the special channel is completed, the tracer medium in the pipeline between the first one-way valve and the ball valve is pumped out by the second pump body and conveyed to the tracer medium recovery tank, so that the tracer medium is recovered, and conditions are provided for rechecking and detecting the internal leakage of the valve seat of the buried earth valve by the detection method of the tracer method and the special channel, thereby preventing the tracer medium from affecting the detection result of the detection method of the tracer method and the special channel.

[0008] Further, a first valve is installed on the pipeline between the tracer medium storage tank and the first pump body, and a second valve is installed on the pipeline between the tracer medium recovery tank and the second pump body.

[0009] The beneficial effects of the further technical scheme are that the first valve and the second valve are arranged to facilitate opening and closing of the pipeline between the tracer medium storage tank and the first pump body and opening and closing of the pipeline between the tracer medium recovery tank and the second pump body according to actual needs.

[0010] Further, a first one-way valve is installed on the pipeline between the first pump body and the ball valve channel, and a fourth valve is installed on the pipeline between the second pump body and the ball valve channel.

[0011] The beneficial effects of the further technical scheme are that the one-way valve is arranged to prevent the tracer medium from flowing back and improve the stability and reliability of the system.

[0012] Further, a gas compressor is connected to the pipeline between the first pump body and the ball valve channel, and a tracer gas storage tank is connected to the gas compressor through a pipeline.

[0013] The beneficial effects of the further technical scheme are that after the tracer method and the special channel are used to detect and judge the internal leakage of the valve seat of the buried earth valve, the tracer method and the special channel are used to re-detect and judge the internal leakage of the valve seat of the buried earth valve. The tracer method and the special channel are combined with the structure characteristics of the ball valve, the ball valve grease injection channel is used as a tracer gas injection channel, and the internal leakage position of the valve seat of the buried earth valve can be accurately judged. Since the maximum design pressure of the domestic long-distance natural gas pipeline is 12 MPa, the tracer gas injection pressure needs to be greater than the operating pressure of the natural gas in the pipeline, therefore, the pressure of the tracer gas is increased by the gas compressor and maintained at more than 12 MPa and less than 15 MPa.

[0014] Further, a third valve is installed on the pipeline between the tracer gas storage tank and the gas compressor, and tracer gas is arranged in the tracer gas storage tank.

[0015] The beneficial effects of the further technical scheme are that the third valve is arranged to facilitate opening and closing of the pipeline between the tracer gas storage tank and the gas compressor according to actual needs, and the tracer gas arranged in the tracer gas storage tank facilitates re-detecting and judging the internal leakage of the valve seat of the buried earth valve by the tracer method and the special channel.

[0016] Further, a second one-way valve and a gas pressure gauge are installed on the pipeline between the gas compressor and the ball valve channel, and the gas pressure gauge is located between the second one-way valve and the gas compressor.

[0017] The beneficial effects of the further technical scheme are that the one-way valve prevents the backflow of the tracer medium and the tracer gas, and improves the stability and reliability of the system.

[0018] Further, the ball valve channel is a channel for injecting cleaning fluid, lubricating grease or sealing grease to the valve seat sealing surface of the ball valve; the ball valve channel comprises a grease injection nozzle, an outer one-way valve, an inner one-way valve, an inner grease injection channel, the grease injection nozzle is provided with a grease injection nozzle protection cap, the grease injection nozzle is connected with the outer one-way valve, the outer one-way valve is connected with the inner one-way valve, the inner one-way valve is connected with the inner grease injection channel, and the first pump body is connected with the grease injection nozzle through a pipeline.

[0019] The beneficial effects of the further technical scheme are that the ball valve grease injection channel (ball valve channel) is a channel for injecting cleaning fluid, lubricating grease, sealing grease and the like to the valve seat sealing surface of the ball valve, which is composed of a grease injection nozzle, a one-way valve, an inner grease injection channel and the like, and the tracer medium is supplemented and the tracer gas is injected by using the grease injection channel, which does not affect the function of the channel itself, and the grease injection channel (ball valve channel) can be restored after use. The ball valve provided with the grease injection nozzle is suitable, and the buried ball valve provided with the grease injection nozzles on both sides of the valve body is particularly suitable. The ball valve internal leakage can be detected conveniently. The first pump body, the second pump body and the gas compressor are connected with the ball valve, and the tracer medium is injected into the ball valve, the tracer medium is recovered and the tracer gas is injected.

[0020] Further, the grease injection nozzle is provided with a grease injection nozzle joint, and the grease injection nozzle joint is provided with a grease injection nozzle vent valve, and the first pump body is connected with the grease injection nozzle joint through a pipeline.

[0021] The beneficial effects of the further technical scheme are that the grease injection nozzle joint is provided, the first pump body, the second pump body and the gas compressor are connected with the ball valve, and the tracer gas in the grease injection nozzle is vented through the grease injection nozzle vent valve when the tracer gas storage tank is disassembled.

[0022] Further, the ball valve is provided with a pipeline medium, and the ball valve is provided with the ball valve channel on both sides; the ball valve comprises a valve seat sealing surface, a valve cavity and a valve cavity vent valve, the ball valve channel is connected with the outer side of the valve seat sealing surface, the valve seat sealing surface is installed in the valve cavity, and the valve cavity vent valve is connected with the valve cavity; the valve cavity vent valve is provided with a valve cavity vent opening, and a tracer gas detector is arranged adjacent to the valve cavity vent opening.

[0023] The beneficial effects of the further technical scheme are that: since the outlet of the grease injection channel of the ball valve is located on the outside of the valve seat sealing surface, i.e. close to the pipeline side, in the closed state of the ball valve, the tracer medium and the tracer gas are injected from the grease injection nozzle on the valve body side into the pipeline on the outside of the valve seat sealing surface of the ball valve, if the sealing surface is not tightly sealed or damaged, the tracer medium and the tracer gas will enter the valve cavity through the valve seat sealing surface under the pressure of the pipeline medium, at this time, the oil and gas and mixed gas in the valve cavity are vented by opening the valve cavity vent valve, and whether the tracer medium and the tracer gas are detected, if the tracer medium and the tracer gas are detected, it is indicated that the sealing surface on this side is internally leaking, whether the tracer medium can be observed by manual observation, if the tracer medium and the tracer gas cannot be detected after a period of time, it is indicated that the sealing surface on this side is not internally leaking. The ball valve is suitable for being provided with the grease injection nozzle, and is particularly suitable for the buried earth ball valve provided with the grease injection nozzles on both sides of the valve body.

[0024] The advantages of the additional aspects of the utility model will be partially given in the following description, some will become apparent from the following description, or will be understood by the practice of the utility model. BRIEF DESCRIPTION OF DRAWINGS

[0025] Fig. 1 The structure schematic diagram of the ball valve internal leakage detection system provided by the utility model embodiment.

[0026] Fig. 2 The structure schematic diagram of the grease injection nozzle provided by the utility model embodiment.

[0027] BRIEF DESCRIPTION OF DRAWINGS 1, tracer medium storage tank;2, first pump body;3, ball valve;4, ball valve channel;5, second pump body;6, tracer medium recovery tank;7, first valve;8, second valve;9, first check valve;10, fourth valve;11, gas compressor;12, tracer gas storage tank;13, third valve;14, second check valve;15, gas pressure gauge;16, outer check valve;17, inner check valve;18, grease injection nozzle protection cap;19, grease injection nozzle connector;20, pipeline medium;21, valve seat sealing surface;22, valve cavity;23, valve cavity vent valve;24, valve cavity venting port. DETAILED DESCRIPTION

[0028] The principles and characteristics of the utility model are described below in combination with the drawings, and the examples are only used to explain the utility model and are not used to limit the scope of the utility model.

[0029] As Figs. 1-2The utility model discloses a ball valve inner leakage detection system, including: tracer medium storage tank 1, be used for conveying tracer medium's first pump body 2 and ball valve 3, tracer medium storage tank 1 is connected with first pump body 2 through pipeline, be equipped with at least one ball valve channel 4 in ball valve 3, first pump body 2 is connected with ball valve channel 4 through pipeline.

[0030] The beneficial effects of the technical scheme of the utility model are that the tracer medium supplementing and special channel are used to detect and judge the inner leakage of the valve seat of the buried earth valve.

[0031] As Figs. 1-2 Further, a second pump body 5 for conveying the tracer medium is connected to the pipeline between the first pump body 2 and the ball valve channel 4, and a tracer medium recovery tank 6 is connected to the second pump body 5 through a pipeline.

[0032] The beneficial effects of the above further technical scheme are that after the detection method of tracer medium supplementing and special channel is completed, the tracer medium in the pipeline between the first one-way valve and the ball valve is pumped out by the second pump body and conveyed to the tracer medium recovery tank, the tracer medium is recovered, conditions are provided for rechecking and detecting the inner leakage of the valve seat of the buried earth valve by the detection method of tracer medium supplementing and special channel, and the detection result of the detection method of tracer medium supplementing and special channel is prevented from being affected by the tracer medium.

[0033] As Figs. 1-2 Further, a first valve 7 is installed on the pipeline between the tracer medium storage tank 6 and the first pump body 2, and a second valve 8 is installed on the pipeline between the tracer medium recovery tank 6 and the second pump body 5.

[0034] The beneficial effects of the above further technical scheme are that the first valve and the second valve are provided to facilitate opening and closing the pipeline between the tracer medium storage tank and the first pump body and opening and closing the pipeline between the tracer medium recovery tank and the second pump body according to actual needs.

[0035] As Figs. 1-2 Further, a first one-way valve 9 is installed on the pipeline between the first pump body 2 and the ball valve channel 4, and a fourth valve 10 is installed on the pipeline between the second pump body 5 and the ball valve channel 4.

[0036] The beneficial effects of the above further technical scheme are that the one-way valve is provided to prevent the tracer medium from flowing back, improve the stability and reliability of the system.

[0037] As Figs. 1-2As shown, further, a gas compressor 11 is connected to the pipeline between the first pump body 2 and the ball valve channel 4, and the gas compressor 11 is connected to a tracer gas storage tank 12 through a pipeline.

[0038] The beneficial effect of the above further technical solution is that after the tracer medium and special channel method is used to detect and judge the seat leakage of the buried globe valve, the tracer method and special channel method are used to re-detect and judge the seat leakage of the buried globe valve. The tracer method detection of internal leakage is combined with the structural characteristics of the ball valve, and the ball valve grease injection channel is used as a tracer gas injection channel, so that the internal leakage position of the buried globe valve can be accurately judged. Since the maximum design pressure of the domestic long-distance natural gas pipeline is 12 MPa, the tracer gas injection pressure needs to be greater than the operating pressure of the natural gas in the pipeline, therefore, the pressure of the tracer gas is increased by the gas compressor and maintained at more than 12 MPa and less than 15 MPa.

[0039] As shown in Figs. 1-2 Further, a third valve 13 is installed on the pipeline between the tracer gas storage tank 12 and the gas compressor 11, and the tracer gas storage tank 12 is provided with tracer gas.

[0040] The beneficial effect of the above further technical solution is that the third valve is provided to facilitate the opening and closing of the pipeline between the tracer gas storage tank and the gas compressor according to actual needs. The tracer gas storage tank is provided with tracer gas, which facilitates the re-detection and judgment of the seat leakage of the buried globe valve by the tracer method and special channel method.

[0041] As shown in Figs. 1-2 Further, a second one-way valve 14 and a gas pressure gauge 15 are installed on the pipeline between the gas compressor 11 and the ball valve channel 4, and the gas pressure gauge 15 is located between the second one-way valve 14 and the gas compressor 11.

[0042] The beneficial effect of the above further technical solution is that the one-way valve prevents the tracer medium and tracer gas from flowing back, improving the stability and reliability of the system. The gas pressure gauge is provided to facilitate real-time monitoring of the pressure of the tracer gas output by the gas compressor. The pressure of the tracer gas is increased by the gas compressor and maintained at more than 12 MPa and less than 15 MPa.

[0043] As shown in Figs. 1-2As shown, further, the ball valve channel 4 is a channel for injecting cleaning fluid, lubricating grease or sealing grease to the valve seat sealing surface of the ball valve 3; the ball valve channel 4 comprises: a grease injection nozzle, an outer one-way valve 16, an inner one-way valve 17, an inner grease injection channel, a grease injection nozzle protective cap 18 is installed at the grease injection nozzle, the grease injection nozzle is connected with the outer one-way valve 16, the outer one-way valve 16 is connected with the inner one-way valve 17, the inner one-way valve 17 is connected with the inner grease injection channel, and the first pump body 2 is connected with the grease injection nozzle through a pipeline.

[0044] The beneficial effect of the above further technical solution is that the ball valve grease injection channel (ball valve channel) is a channel for injecting cleaning fluid, lubricating grease, sealing grease and the like to the valve seat sealing surface of the ball valve, which is composed of a grease injection nozzle, a one-way valve, an inner grease injection channel and the like. The injection channel is used to supplement the tracer medium and to inject the tracer gas, which does not affect the function of the channel itself. After use, the grease injection channel (ball valve channel) can be restored to its original state. It is suitable for ball valves equipped with a grease injection nozzle, especially for buried earth ball valves equipped with a grease injection nozzle on both sides of the valve body. It is convenient for detecting the internal leakage of the ball valve. It is convenient for connecting the first pump body, the second pump body and the gas compressor with the ball valve, and for injecting the tracer medium into the ball valve, recovering the tracer medium and injecting the tracer gas.

[0045] As shown in Figs. 1-2 , further, a grease injection nozzle connector 19 is installed at the grease injection nozzle, and a grease injection nozzle vent valve is arranged on the grease injection nozzle connector 19, and the first pump body is connected with the grease injection nozzle connector through a pipeline.

[0046] The beneficial effect of the above further technical solution is that the grease injection nozzle connector is provided, which is convenient for connecting the first pump body, the second pump body and the gas compressor with the ball valve, and is convenient for venting the tracer gas at the grease injection nozzle through the grease injection nozzle vent valve when the tracer gas storage tank is disassembled.

[0047] As shown in Figs. 1-2 Figs. 1-2 , further, a pipeline internal medium 20 is arranged in the ball valve 3, and the ball valve channel 4 is arranged on both sides of the ball valve 3; the ball valve 3 comprises: a valve seat sealing surface 21, a valve cavity 22, and a valve cavity vent valve 23, the ball valve channel 4 is connected with the outer side of the valve seat sealing surface 21, the valve seat sealing surface 21 is installed in the valve cavity 22, and the valve cavity vent valve 23 is connected with the valve cavity 22; a valve cavity vent opening 24 is arranged on the valve cavity vent valve 23, and a tracer gas detector is arranged adjacent to the valve cavity vent opening 24.

[0048] The beneficial effects of the further technical scheme are: since the outlet of the ball valve grease injection channel is located on the outside of the valve seat sealing surface, i.e. close to the pipeline side, in the closed state of the ball valve, the tracer medium and tracer gas are injected from the grease injection nozzle on one side of the valve body into the pipeline on the outside of the valve seat sealing surface of the ball valve, if the sealing surface is not tightly sealed or damaged, the tracer medium and tracer gas will enter the valve cavity through the valve seat sealing surface under the pressure of the medium in the pipeline, at this time, the oil and gas and mixed gas in the valve cavity are vented by opening the vent valve, and whether the tracer medium and tracer gas are detected, if the tracer medium and tracer gas are detected, it means that the sealing surface on this side is leaking, whether there is tracer medium can be observed by manual observation, if the tracer medium and tracer gas cannot be detected after a period of time, it means that the sealing surface on this side is not leaking. It is suitable for ball valves equipped with grease injection nozzles, especially for buried ball valves equipped with grease injection nozzles on both sides of the valve body.

[0049] Since the outlet of the ball valve grease injection channel (ball valve channel) is located on the outside of the valve seat sealing surface, i.e. close to the pipeline side, in the closed state of the ball valve, the tracer medium and tracer gas are injected from the grease injection nozzle on one side (upstream side or downstream side) of the valve body (ball valve) into the pipeline on the outside of the valve seat sealing surface of the ball valve, if the sealing surface (valve seat sealing surface) is not tightly sealed or damaged, the tracer medium and tracer gas will enter the valve cavity through the valve seat sealing surface under the pressure of the medium in the pipeline, at this time, the oil and gas and mixed gas in the valve cavity are vented by opening the vent valve, and whether the tracer medium and tracer gas are detected, if the tracer medium and tracer gas are detected, it means that the sealing surface (valve seat sealing surface) on this side is leaking, if the tracer medium and tracer gas cannot be detected after a period of time, it means that the sealing surface on this side is not leaking, at this time, the tracer medium and tracer gas injection and detection of the valve seat sealing surface on the other side can be performed again, and whether the leakage occurs can be judged according to the same principle.

[0050] In the case that the sealing surface (valve seat sealing surface) on one side of the ball valve is detected to be leaking, after the injection of the tracer medium and tracer gas is stopped at the grease injection nozzle on this side, the valve cavity is continuously vented to discharge all the mixed oil and gas and mixed gas in the valve cavity until the tracer medium and tracer gas cannot be detected, so as to provide a prerequisite for detecting whether the sealing surface on the other side is leaking, and prevent the tracer medium and tracer gas injected on this side from interfering with the detection on the other side.

[0051] The tracer medium can be lubricating oil or grease, and the tracer gas can be hydrogen, hydrogen-nitrogen mixed gas, helium and other common gases. Since the maximum design pressure of the domestic long-distance natural gas pipeline is 12 MPa, the injection pressure of the tracer gas needs to be greater than the operating pressure of the natural gas in the pipeline. Therefore, the storage pressure of the tracer gas needs to be maintained at 12 MPa or above and 15 MPa or below. In view of the fact that the maximum diameter of the buried valve of the domestic long-distance natural gas pipeline is about 2 cubic meters, the water volume of the tracer gas storage tank is about 3 cubic meters.

[0052] In order to achieve better detection effect, when injecting the tracer medium and the tracer gas from the grease injection nozzle, the valve cavity vent valve of the ball valve can be opened at the same time to vent the valve cavity of the ball valve so as to form a certain pressure difference in front of and behind the valve seat sealing surface, thereby facilitating the tracer medium and the tracer gas to pass through the possible damage on the sealing surface (valve seat sealing surface) more quickly into the valve cavity, and then discharged through the valve cavity vent.

[0053] Operation method:

[0054] 1. First, close the ball valve which needs to be detected for internal leakage, unscrew the grease nipple protection cap on one side (upstream side or downstream side) of the valve body (ball valve), screw on the special joint for the grease nipple (grease nipple joint), connect the tracer medium storage tank, open the outlet valve (first valve) of the tracer medium storage tank, make the tracer medium enter the pipeline outside the valve seat sealing surface through the grease nipple, at this time, open the valve cavity vent valve to vent, observe the gas at the valve cavity venting port, if oil gas or tracer medium can be observed, it means that the sealing surface (valve seat sealing surface) on this side is internally leaking, if no oil gas or tracer medium can be detected after a period of time, it means that the sealing surface on this side is not internally leaking, at this time, the tracer medium injection and detection of the valve seat sealing surface on the other side can be performed again. Close the outlet valve (first valve) of the tracer medium storage tank, close the valve cavity vent valve, vent the pressure of the grease nipple injection pipeline, remove the special joint for the grease nipple (grease nipple joint), screw on the grease nipple protection cap, open the valve cavity vent valve to continuously vent the valve cavity, discharge all the mixed oil gas in the valve cavity until no tracer medium and oil gas can be detected, at this time, unscrew the grease nipple protection cap on the other side (upstream side or downstream side) of the valve body (ball valve), screw on the special joint for the grease nipple (grease nipple joint), connect the tracer medium storage tank, open the outlet valve (first valve) of the tracer medium storage tank, make the tracer medium enter the pipeline outside the valve seat sealing surface through the grease nipple, at the same time, observe the gas at the venting pipeline outlet (valve cavity venting port), if tracer medium or oil gas can be observed, it means that the sealing surface (valve seat sealing surface) on this side is internally leaking, if no tracer medium or oil gas can be detected after a period of time, it means that the sealing surface (valve seat sealing surface) on this side is not internally leaking. After detection, close the outlet valve (first valve) of the tracer medium storage tank, close the valve cavity vent valve, vent the pressure of the grease nipple injection pipeline, remove the special joint for the grease nipple (grease nipple joint), screw on the grease nipple protection cap, and restore the original appearance.

[0055] 2、After the tracer medium test is completed, the ball valve that needs to be detected for internal leakage is closed, the grease injection nozzle protection cap on one side (the upstream side or the downstream side) of the valve body (the ball valve) is unscrewed, the grease injection nozzle special joint (the grease injection nozzle joint) is screwed on, the tracer gas storage tank is connected, the outlet valve (the third valve) of the tracer gas storage tank is opened, the tracer gas is injected into the pipeline outside the valve seat sealing surface through the grease injection nozzle, at this time, the valve cavity vent valve of the ball valve is opened for venting, and the tracer gas detector is used at the valve cavity venting port to detect whether the tracer gas can be detected. If the tracer gas can be detected, it indicates that the sealing surface (the valve seat sealing surface) on this side is internally leaked. If the tracer gas cannot be detected after a period of time, it indicates that the sealing surface (the valve seat sealing surface) on this side is not internally leaked. At this time, the tracer gas injection and detection of the valve seat sealing surface on the other side can be performed. The outlet valve (the third valve) of the tracer gas storage tank is closed, the valve cavity vent valve is closed, the pressure of the grease injection nozzle injection pipeline is vented, the grease injection nozzle special joint (the grease injection nozzle joint) is removed, the grease injection nozzle protection cap is screwed on, the valve cavity vent valve is opened for continuous venting of the valve cavity, and the mixed gas in the valve cavity is completely discharged until the tracer gas cannot be detected. At this time, the grease injection nozzle protection cap on the other side (the upstream side or the downstream side) of the valve body (the ball valve) is unscrewed, the grease injection nozzle special joint (the grease injection nozzle joint) is screwed on, the tracer gas storage tank is connected, the outlet valve (the third valve) of the tracer gas storage tank is opened, the tracer gas is injected into the pipeline outside the valve seat sealing surface through the grease injection nozzle, and at the same time, the tracer gas detector is used at the venting pipeline outlet (the valve cavity venting port) to detect whether the tracer gas can be detected. If the tracer gas can be detected, it indicates that the sealing surface (the valve seat sealing surface) on this side is internally leaked. If the tracer gas cannot be detected after a period of time, it indicates that the sealing surface (the valve seat sealing surface) on this side is not internally leaked. After the detection is completed, the outlet valve (the third valve) of the tracer gas storage tank is closed, the valve cavity vent valve is closed, the pressure of the grease injection nozzle injection pipeline is vented, the grease injection nozzle special joint (the grease injection nozzle joint) is removed, the grease injection nozzle protection cap is screwed on, and the original appearance is restored.

[0056] The tracer method is combined with the structural characteristics of the ball valve to use the grease injection channel (the ball valve channel) of the ball valve as a tracer gas injection channel, so that the specific position of the internal leakage of the ball valve can be quickly and accurately determined.

[0057] 3、After all the detection is completed, the tracer medium in the tracer medium storage tank can be delivered to the ball valve through the first pump body to realize the injection of the tracer medium.

[0058] The industry problem that it is impossible to detect which side of the valve seat sealing surface of the buried earth valve (the ball valve) is internally leaked is solved, the isolation effect of the ball valve in the process of natural gas pipeline maintenance and modification can be significantly improved, the amount of natural gas venting can be significantly reduced, the methane emission reduction is assisted, and good economic and social benefits are obtained.

[0059] Finally, it should be noted that: the above embodiments are used to illustrate the technical solutions of the present application, but not limited to them; although the present application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that: it can still modify the technical solutions recorded in the foregoing embodiments, or make equivalent replacement to part 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 application.

Claims

1. A ball valve internal leakage detection system, characterized by, The tracer medium storage tank is connected with the first pump body through a pipeline, and the ball valve is provided with at least one ball valve channel, and the first pump body is connected with the ball valve channel through a pipeline. A second pump body for conveying tracer medium is connected on the pipeline between the first pump body and the ball valve channel, and the second pump body is connected with a tracer medium recovery tank through a pipeline.

2. A ball valve internal leakage detection system as claimed in claim 1, wherein, A first valve is installed on the pipeline between the tracer medium storage tank and the first pump body, and a second valve is installed on the pipeline between the tracer medium recovery tank and the second pump body.

3. A ball valve internal leakage detection system as claimed in claim 2, wherein, A first one-way valve is installed on the pipeline between the first pump body and the ball valve channel, and a fourth valve is installed on the pipeline between the second pump body and the ball valve channel.

4. The ball valve internal leak detection system of claim 2, wherein, A gas compressor is connected on the pipeline between the first pump body and the ball valve channel, and the gas compressor is connected with a tracer gas storage tank through a pipeline.

5. The ball valve internal leak detection system of claim 1, wherein, A third valve is installed on the pipeline between the tracer gas storage tank and the gas compressor, and the tracer gas storage tank is provided with tracer gas.

6. A ball valve internal leakage detection system as claimed in claim 5, wherein, A second one-way valve and a gas pressure gauge are installed on the pipeline between the gas compressor and the ball valve channel, and the gas pressure gauge is located between the second one-way valve and the gas compressor.

7. A ball valve internal leakage detection system as claimed in claim 5, wherein, The ball valve channel is a channel for injecting cleaning liquid, lubricating grease or sealing grease to the valve seat sealing surface of the ball valve, and the ball valve channel comprises a grease injection nozzle, an outer one-way valve, an inner one-way valve, and an inner grease injection channel.

8. The ball valve internal leak detection system of claim 1, wherein, A grease injection nozzle connector is installed on the grease injection nozzle, and the grease injection nozzle connector is provided with a grease injection nozzle vent valve.

9. A ball valve internal leak detection system as claimed in claim 8, wherein, The ball valve is provided with pipeline internal medium, and both sides of the ball valve are provided with the ball valve channel.

10. The ball valve internal leak detection system of claim 1, wherein, The ball valve comprises a valve seat sealing surface, a valve cavity, and a valve cavity vent valve, the ball valve channel is connected with the outer side of the valve seat sealing surface, the valve seat sealing surface is installed in the valve cavity, and the valve cavity vent valve is connected with the valve cavity. The valve cavity vent valve is provided with a valve cavity vent opening, and a tracer gas detector is arranged adjacent to the valve cavity vent opening.

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