Ball valve inner leakage detection system and method

Abstract

The invention provides a ball valve inner leakage detection system and method. A ball valve inner leakage detection system comprises a tracer gas storage tank and a ball valve, at least one ball valve channel is arranged in the ball valve, and the tracer gas storage tank 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 tracing method and a special channel method. The tracer method for detecting inner leakage and the structural characteristics of the ball valve are combined, and a ball valve grease injection channel is used as a tracer gas injection channel. And the inner leakage position of the valve seat of the buried earth valve can be accurately judged.

Description

Technical Field

[0001] The present invention relates to the technical field of ball valve leakage detection, and in particular to a ball valve internal leakage detection system and method. Background Art

[0002] There are valve chambers or valve wells at regular intervals in natural gas pipelines. Most of the pipeline trunk shut-off valves in the valve chambers or valve wells are buried globe valves. Because the valve body of the buried globe valve is completely buried in the soil below the ground, its internal leakage detection has always been a difficult problem in the industry. In particular, there is currently no economical and efficient technology and method to determine which side of the valve (upstream or downstream) the valve seat is leaking. Summary of the invention

[0003] The technical problem to be solved by the present invention is to provide a ball valve internal leakage detection system and method in view of the deficiencies in the prior art.

[0004] The technical solution of the present invention to solve the above technical problems is as follows: a ball valve internal leakage detection system, comprising: a tracer gas storage tank, a ball valve, wherein the ball valve is provided with at least one ball valve channel, and the tracer gas storage tank is connected to the ball valve channel through a pipeline.

[0005] The beneficial effect of the technical solution of the present invention is: the internal leakage of the valve seat of the buried ball valve is detected and judged by using the tracer method plus the special channel method. The tracer method for detecting internal leakage is combined with the structural characteristics of the ball valve, and the ball valve grease injection channel is used as the tracer gas injection channel. The internal leakage position of the valve seat of the buried ball valve can be accurately judged.

[0006] Furthermore, an outlet valve is provided on the pipeline between the tracer gas storage tank and the ball valve, and the tracer gas storage tank is provided with tracer gas.

[0007] The beneficial effects of adopting the above further technical solution are: the setting of the outlet valve facilitates opening and closing the pipeline between the tracer gas storage tank and the ball valve according to actual needs. The valve seat internal leakage of the buried ball valve is detected and judged by using the tracer method plus the special channel method.

[0008] Furthermore, the tracer gas is hydrogen, a hydrogen-nitrogen mixed gas or helium, the pressure of the tracer gas in the tracer gas storage tank is greater than 12 MPa and less than 15 MPa, and the water volume of the tracer gas storage tank is 3 cubic meters.

[0009] The beneficial effect of adopting the above further technical solution is: since the current maximum design pressure of domestic long-distance natural gas pipelines is 12 MPa, the tracer gas injection pressure needs to be greater than the natural gas operating pressure in the pipeline. Therefore, the tracer gas storage pressure needs to be maintained above 12 MPa and below 15 MPa. In view of the fact that the water volume of the valve cavity of the largest diameter buried earth valve of the domestic long-distance natural gas pipeline is about 2 cubic meters, the water volume of the tracer gas storage tank can be set to about 3 cubic meters.

[0010] Furthermore, the ball valve channel is a channel for injecting cleaning liquid, lubricating grease or sealing grease into the valve seat sealing surface of the ball valve.

[0011] The beneficial effect of adopting the above-mentioned further technical scheme is that the ball valve grease injection channel is a channel used to inject cleaning liquid, grease, sealing grease, etc. into the valve seat sealing surface of the ball valve, and is composed of a grease injection nozzle, a one-way valve, an internal grease injection channel, etc. The grease injection channel is used to inject tracer gas without affecting the function of the channel itself. The grease injection channel can be restored to its original state after use.

[0012] Furthermore, the ball valve channel includes: a grease injection nozzle, a one-way valve and an internal grease injection channel, the grease injection nozzle is connected to the one-way valve, the one-way valve is connected to the internal grease injection channel, and the tracer gas storage tank is connected to the grease injection nozzle through a pipeline.

[0013] The beneficial effect of adopting the above further technical solution is that 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, and is convenient for detecting internal leakage of the ball valve.

[0014] Furthermore, a grease nozzle protection cap is installed at the grease nozzle, the one-way valve includes an outer one-way valve and an inner one-way valve, the grease nozzle is connected to the outer one-way valve, the outer one-way valve is connected to the inner one-way valve, and the inner one-way valve is connected to the inner grease injection channel.

[0015] The beneficial effects of adopting the above further technical solution are: it is convenient to connect the tracer gas storage tank with the ball valve, and it is convenient to inject the tracer gas into the ball valve.

[0016] Furthermore, a grease nozzle joint is installed at the grease nozzle, a grease nozzle vent valve is provided on the grease nozzle joint, and the tracer gas storage tank is connected to the grease nozzle through the grease nozzle joint.

[0017] The beneficial effect of adopting the above further technical solution is that the setting of the grease nozzle joint facilitates the connection between the tracer gas storage tank and the ball valve, and facilitates the venting of the tracer gas at the grease nozzle through the grease nozzle vent valve when the tracer gas storage tank is disassembled.

[0018] Furthermore, the ball valve includes: a valve seat sealing surface, a valve cavity, and a valve cavity vent valve, the ball valve channel is connected to 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 to the valve cavity; a valve cavity vent port is provided on the valve cavity vent valve, and a tracer gas detector is provided adjacent to the valve cavity vent port.

[0019] The beneficial effect of adopting the above-mentioned further technical scheme is: since the outlet of the ball valve grease injection channel is located on the outside of the valve seat sealing surface, that is, close to one side of the pipeline, therefore, when the ball valve is closed, the tracer gas is injected from the grease injection nozzle on one side of the valve body through the grease injection channel into the pipeline on the outside of the valve seat sealing surface of the ball valve. If the sealing surface is not sealed tightly or is damaged, the 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, open the valve cavity vent valve to vent the mixed gas in the valve cavity, and detect whether there is tracer gas at the same time. If the tracer gas can be detected, it means that the sealing surface on this side is leaking internally. If the missing gas cannot be detected after a period of time, it means that the sealing surface on this side is not leaking internally.

[0020] Furthermore, the ball valve is provided with a medium in a pipeline, and the ball valve channels are provided on both sides of the ball valve.

[0021] The beneficial effect of adopting the above further technical solution is that 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.

[0022] In addition, the present invention further provides a ball valve internal leakage detection method, based on a ball valve internal leakage detection system described in any one of the above, the ball valve internal leakage detection method comprises: S1, closing the ball valve;

[0023] S2. Unscrew the protective cap of the grease nozzle on one side of the ball valve; S3. Connect the tracer gas storage tank to the grease nozzle; S4. Open the outlet valve to allow the tracer gas to enter the ball valve channel outside the valve seat sealing surface through the grease nozzle; S5. Open the valve cavity vent valve to vent, and use the tracer gas detector to detect at the valve cavity vent port; S6. If the tracer gas detector detects tracer gas, the valve seat sealing surface of the ball valve is leaking internally; S7. If the tracer gas detector cannot detect tracer gas, the valve seat sealing surface of the ball valve is not leaking internally.

[0024] The beneficial effect of the technical solution of the present invention is: the internal leakage of the valve seat of the buried ball valve is detected and judged by using the tracer method plus the special channel method. The tracer method for detecting internal leakage is combined with the structural characteristics of the ball valve, and the ball valve grease injection channel is used as the tracer gas injection channel. The internal leakage position of the valve seat of the buried ball valve can be accurately judged.

[0025] Advantages of additional aspects of the present invention will be given in part in the following description, and in part will be obvious from the following description, or will be learned through practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 This is one of the structural schematic diagrams of the ball valve internal leakage detection system provided in an embodiment of the present invention.

[0027] Figure 2 The second structural schematic diagram of the ball valve internal leakage detection system provided in an embodiment of the present invention.

[0028] Figure 3 A schematic structural diagram of a grease injection nozzle provided in an embodiment of the present invention.

[0029] Figure 4 A schematic flowchart of a ball valve internal leakage detection method provided in an embodiment of the present invention.

[0030] Explanation of the accompanying figures: 1. Tracer gas storage tank; 2. Ball valve; 3. Ball valve channel; 4. Outlet valve; 5. Grease nipple protection cap; 6. External check valve; 7. Internal check valve; 8. Grease nipple connector; 9. Valve seat sealing surface; 10. Valve cavity; 11. Valve cavity vent valve; 12. Valve cavity vent port; 13. Medium in the pipeline. DETAILED DESCRIPTION

[0031] The principles and features of the present invention are described below in conjunction with the accompanying drawings. The examples given are only used to explain the present invention but not to limit the scope of the present invention.

[0032] like Figures 1 to 3 As shown, an embodiment of the present invention provides a ball valve internal leakage detection system, including: a tracer gas storage tank 1, a ball valve 2, wherein the ball valve 2 is provided with at least one ball valve channel 3, and the tracer gas storage tank 1 is connected to the ball valve channel 3 through a pipeline.

[0033] The beneficial effect of the technical solution of the present invention is: the internal leakage of the valve seat of the buried ball valve is detected and judged by using the tracer method plus the special channel method. The tracer method for detecting internal leakage is combined with the structural characteristics of the ball valve, and the ball valve grease injection channel is used as the tracer gas injection channel. The internal leakage position of the valve seat of the buried ball valve can be accurately judged.

[0034] In order to accurately determine the position of the internal leakage of the valve seat of the buried ball valve, the present invention uses a tracer method plus a special channel method to detect and determine the internal leakage of the valve seat of the buried ball valve. The present invention 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.

[0035] like Figures 1 to 3As shown, further, an outlet valve 4 is provided on the pipeline between the tracer gas storage tank 1 and the ball valve 2, and the tracer gas storage tank 1 is provided with tracer gas.

[0036] The beneficial effects of adopting the above further technical solution are: the setting of the outlet valve facilitates opening and closing the pipeline between the tracer gas storage tank and the ball valve according to actual needs. The valve seat internal leakage of the buried ball valve is detected and judged by using the tracer method plus the special channel method.

[0037] Furthermore, the tracer gas is hydrogen, a hydrogen-nitrogen mixed gas or helium, the pressure of the tracer gas in the tracer gas storage tank 1 is greater than 12 MPa and less than 15 MPa, and the water volume of the tracer gas storage tank 1 is 3 cubic meters.

[0038] The beneficial effect of adopting the above further technical solution is: since the current maximum design pressure of domestic long-distance natural gas pipelines is 12 MPa, the tracer gas injection pressure needs to be greater than the natural gas operating pressure in the pipeline. Therefore, the tracer gas storage pressure needs to be maintained above 12 MPa and below 15 MPa. In view of the fact that the water volume of the valve cavity of the largest diameter buried earth valve of the domestic long-distance natural gas pipeline is about 2 cubic meters, the water volume of the tracer gas storage tank can be set to about 3 cubic meters.

[0039] like Figures 1 to 3 As shown, further, the ball valve channel 3 is a channel for injecting cleaning liquid, grease or sealing grease into the valve seat sealing surface of the ball valve 2.

[0040] The beneficial effect of adopting the above-mentioned further technical scheme is that the ball valve grease injection channel is a channel used to inject cleaning liquid, grease, sealing grease, etc. into the valve seat sealing surface of the ball valve, and is composed of a grease injection nozzle, a one-way valve, an internal grease injection channel, etc. The grease injection channel is used to inject tracer gas without affecting the function of the channel itself. The grease injection channel can be restored to its original state after use.

[0041] like Figures 1 to 3 As shown, further, the ball valve channel 3 includes: a grease injection nozzle, a one-way valve and an internal grease injection channel, the grease injection nozzle is connected to the one-way valve, the one-way valve is connected to the internal grease injection channel, and the tracer gas storage tank 1 is connected to the grease injection nozzle through a pipeline.

[0042] The beneficial effect of adopting the above further technical solution is that 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, and is convenient for detecting internal leakage of the ball valve.

[0043] like Figures 1 to 3As shown, further, a grease nozzle protective cap 5 is installed at the grease nozzle, the one-way valve includes an external one-way valve 6 and an internal one-way valve 7, the grease nozzle is connected to the external one-way valve 6, the external one-way valve 6 is connected to the internal one-way valve 7, and the internal one-way valve 7 is connected to the internal grease injection channel.

[0044] The beneficial effects of adopting the above further technical solution are: it is convenient to connect the tracer gas storage tank with the ball valve, and it is convenient to inject the tracer gas into the ball valve.

[0045] like Figures 1 to 3 As shown, further, a grease nozzle connector 8 is installed at the grease nozzle, a grease nozzle vent valve is provided on the grease nozzle connector 8, and the tracer gas storage tank 1 is connected to the grease nozzle through the grease nozzle connector 8.

[0046] The beneficial effect of adopting the above further technical solution is that the setting of the grease nozzle joint facilitates the connection between the tracer gas storage tank and the ball valve, and facilitates the venting of the tracer gas at the grease nozzle through the grease nozzle vent valve when the tracer gas storage tank is disassembled.

[0047] like Figures 1 to 3 As shown, further, the ball valve 2 includes: a valve seat sealing surface 9, a valve cavity 10, and a valve cavity vent valve 11, the ball valve channel 3 is connected to the outer side of the valve seat sealing surface 9, the valve seat sealing surface 9 is installed in the valve cavity 10, and the valve cavity vent valve 11 is connected to the valve cavity 10; a valve cavity vent port 12 is provided on the valve cavity vent valve 11, and a tracer gas detector is provided adjacent to the valve cavity vent port 12.

[0048] The beneficial effect of adopting the above-mentioned further technical scheme is: since the outlet of the ball valve grease injection channel is located on the outside of the valve seat sealing surface, that is, close to one side of the pipeline, therefore, when the ball valve is closed, the tracer gas is injected from the grease injection nozzle on one side of the valve body through the grease injection channel into the pipeline on the outside of the valve seat sealing surface of the ball valve. If the sealing surface is not sealed tightly or is damaged, the 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, open the valve cavity vent valve to vent the mixed gas in the valve cavity, and detect whether there is tracer gas at the same time. If the tracer gas can be detected, it means that the sealing surface on this side is leaking internally. If the missing gas cannot be detected after a period of time, it means that the sealing surface on this side is not leaking internally.

[0049] like Figures 1 to 3 As shown, further, the ball valve 2 is provided with a pipeline medium 13, and the ball valve channels 3 are provided on both sides of the ball valve 2.

[0050] The beneficial effect of adopting the above further technical solution is that 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.

[0051] A ball valve internal leakage detection system provided in an embodiment of the present invention can be a buried ball valve internal leakage detection system, including a tracer gas storage tank, a special connector for grease nozzles (grease nozzle connector), a tracer gas detector, etc.

[0052] The ball valve grease injection channel (ball valve channel) is a channel used to inject cleaning liquid, grease, sealing grease, etc. into the valve seat sealing surface of the ball valve. It is composed of a grease injection nozzle, a one-way valve, an internal grease injection channel, etc. The grease injection channel is used to inject tracer gas without affecting the function of the channel itself. The grease injection channel can be restored to its original state after use.

[0053] Since the outlet of the ball valve grease injection channel (ball valve channel) is located outside the valve seat sealing surface, that is, close to the pipeline side, therefore, when the ball valve is closed, the tracer gas is injected into the pipeline outside the valve seat sealing surface of the ball valve from the grease injection nozzle on one side (upstream side or downstream side) of the valve body (ball valve) through the grease injection channel (ball valve channel). If the sealing surface (valve seat sealing surface) is not sealed tightly or damaged, the 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, open the valve cavity vent valve to vent the mixed gas in the valve cavity, and detect whether there is tracer gas at the same time. If the tracer gas can be detected, it means that the sealing surface (valve seat sealing surface) on this side is leaking internally. If the missing gas cannot be detected after a period of time, it means that the sealing surface on this side is not leaking internally. At this time, the valve seat sealing surface on the other side can be injected and tested with tracer gas, and whether internal leakage occurs can be judged according to the same principle.

[0054] When it is detected that the sealing surface (seat sealing surface) on one side of the ball valve is leaking internally, the valve cavity should be continuously vented after the grease nozzle on this side stops injecting tracer gas, so that all the mixed gas in the valve cavity is discharged, until no tracer gas is detected, so as to provide the prerequisite for detecting whether the sealing surface on the other side is leaking internally, and prevent the tracer gas injected on this side from interfering with the detection on the other side.

[0055] Tracer gas can be selected from common gases such as hydrogen, hydrogen-nitrogen mixed gas, and helium. Since the current maximum design pressure of domestic long-distance natural gas pipelines is 12 MPa, the tracer gas injection pressure needs to be greater than the natural gas operating pressure in the pipeline. Therefore, the tracer gas storage pressure needs to be maintained above 12 MPa and below 15 MPa. In view of the fact that the valve cavity water volume of the largest diameter buried globe valve in domestic long-distance natural gas pipelines is about 2 cubic meters, the water volume of the tracer gas storage tank can be set to about 3 cubic meters.

[0056] like Figure 4As shown, in addition, the present invention further provides a ball valve internal leakage detection method, based on a ball valve internal leakage detection system described in any one of the above items, the ball valve internal leakage detection method includes: S1, closing the ball valve; S2, unscrewing the grease nozzle protection cap on one side of the ball valve; S3, connecting the tracer gas storage tank to the grease nozzle; S4, opening the outlet valve to allow the tracer gas to enter the ball valve channel outside the valve seat sealing surface through the grease nozzle; S5, opening the valve cavity vent valve for venting, and using a tracer gas detector for detection at the valve cavity vent port; S6, if the tracer gas detector detects tracer gas, the valve seat sealing surface of the ball valve is leaking; S7, if the tracer gas detector cannot detect tracer gas, the valve seat sealing surface of the ball valve is not leaking.

[0057] The beneficial effect of the technical solution of the present invention is: the internal leakage of the valve seat of the buried ball valve is detected and judged by using the tracer method plus the special channel method. The tracer method for detecting internal leakage is combined with the structural characteristics of the ball valve, and the ball valve grease injection channel is used as the tracer gas injection channel. The internal leakage position of the valve seat of the buried ball valve can be accurately judged.

[0058] The tracer method for detecting internal leakage is combined with the structural characteristics of the ball valve, and the tracer gas is injected through the grease injection channel of the ball valve, so as to determine which side of the ball valve seat is leaking.

[0059] In order to achieve better detection effect, when injecting 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 that a certain pressure difference is formed before and after the valve seat sealing surface, which makes it easier for the tracer gas to enter the valve cavity through the possible damage on the sealing surface (valve seat sealing surface) more quickly, and then be discharged through the valve cavity vent port.

[0060] like Figures 1 to 3As shown, the operation method is: first close the ball valve that needs to be tested for internal leakage, unscrew the grease nozzle protection cap 5 on one side (upstream side or downstream side) of the valve body (ball valve), screw on the special connector for the grease nozzle (grease nozzle connector 8), connect the tracer gas storage tank 1, open the outlet valve 4 of the tracer gas storage tank 1, and allow the tracer gas to enter the pipeline outside the valve seat sealing surface 9 through the grease nozzle. At this time, open the valve cavity vent valve 11 of the ball valve for venting, and use a tracer gas detector to detect at the valve cavity vent port 12. If the tracer gas can be detected, it means that the sealing surface (valve seat sealing surface) on this side is leaking internally. If the missing gas cannot be detected after a period of time, it means that the sealing surface on this side is not leaking internally. At this time, the tracer gas can be injected and detected into the valve seat sealing surface 9 on the other side. Close the outlet valve 4 of the tracer gas storage tank 1, close the valve cavity vent valve 11, drain the injection line pressure of the grease nozzle, remove the special joint for the grease nozzle (grease nozzle joint), screw on the grease nozzle protection cap 5, open the valve cavity vent valve 11 to continuously vent the valve cavity, and completely discharge the mixed gas in the valve cavity 10 until no tracer gas is detected. At this time, unscrew the grease nozzle protection cap on the other side (upstream or downstream side) of the valve body (ball valve), screw on the special joint for the grease nozzle (grease nozzle joint), Connect the tracer gas storage tank 1, open the outlet valve 4 of the tracer gas storage tank 1, and allow the tracer gas to enter the pipeline outside the valve seat sealing surface 9 through the grease nozzle. At the same time, use the tracer gas detector to detect at the outlet of the venting pipeline (valve cavity venting port). If the tracer gas can be detected, it means that the sealing surface on this side (valve seat sealing surface 9) is leaking internally. If the missing gas cannot be detected after a period of time, it means that the sealing surface on this side (valve seat sealing surface 9) is not leaking internally. After the detection is completed, close the outlet valve 4 of the tracer gas storage tank 1, close the valve cavity vent valve 11, empty the grease nozzle injection pipeline pressure, remove the grease nozzle special joint (grease nozzle joint 8), screw on the grease nozzle protection cap 5, and restore the original appearance of the site.

[0061] The tracer method for detecting internal leakage is combined with the structural characteristics of the ball valve, and the ball valve grease injection channel (ball valve channel) is used as the tracer gas injection channel to achieve the purpose of quickly and accurately determining the specific location of the ball valve internal leakage.

[0062] It solves the industry problem that buried earth valves (ball valves) cannot detect which side of the valve seat sealing surface is leaking. It can significantly improve the isolation effect of the ball valve during the maintenance and renovation of natural gas pipelines, significantly reduce the amount of natural gas venting, and help reduce methane emissions. It has good economic and social benefits.

[0063] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some or all of the technical features therein by equivalents. However, these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A ball valve internal leakage detection system, characterized in that: include: A tracer gas storage tank and a ball valve, wherein the ball valve is provided with at least one ball valve channel, and the tracer gas storage tank is connected to the ball valve channel through a pipeline.

2. A ball valve internal leakage detection system according to claim 1, characterized in that: An outlet valve is arranged on the pipeline between the tracer gas storage tank and the ball valve, and tracer gas is arranged in the tracer gas storage tank.

3. A ball valve internal leakage detection system according to claim 2, characterized in that: The tracer gas is hydrogen, a hydrogen-nitrogen mixed gas or helium. The pressure of the tracer gas in the tracer gas storage tank is greater than 12 MPa and less than 15 MPa. The water volume of the tracer gas storage tank is 3 cubic meters.

4. A ball valve internal leakage detection system according to claim 1, characterized in that: The ball valve channel is a channel used to inject cleaning liquid, lubricating grease or sealing grease into the valve seat sealing surface of the ball valve.

5. A ball valve internal leakage detection system according to claim 1, characterized in that: The ball valve channel comprises: a grease injection nozzle, a one-way valve and an internal grease injection channel, the grease injection nozzle is connected to the one-way valve, the one-way valve is connected to the internal grease injection channel, and the tracer gas storage tank is connected to the grease injection nozzle through a pipeline.

6. A ball valve internal leakage detection system according to claim 5, characterized in that: A grease nozzle protection cap is installed at the grease nozzle, and the one-way valve includes an outer one-way valve and an inner one-way valve. The grease nozzle is connected to the outer one-way valve, the outer one-way valve is connected to the inner one-way valve, and the inner one-way valve is connected to the inner grease injection channel.

7. A ball valve internal leakage detection system according to claim 5, characterized in that: A grease nozzle joint is installed at the grease nozzle, a grease nozzle vent valve is arranged on the grease nozzle joint, and the tracer gas storage tank is connected to the grease nozzle through the grease nozzle joint.

8. A ball valve internal leakage detection system according to claim 1, characterized in that: The ball valve includes: a valve seat sealing surface, a valve cavity, and a valve cavity vent valve. The ball valve channel is connected to the outer side of the valve seat sealing surface. The valve seat sealing surface is installed in the valve cavity. The valve cavity vent valve is connected to the valve cavity. A valve cavity vent port is provided on the valve cavity vent valve, and a tracer gas detector is provided adjacent to the valve cavity vent port.

9. A ball valve internal leakage detection system according to claim 8, characterized in that: The ball valve is provided with a medium in a pipeline, and both sides of the ball valve are provided with the ball valve channels.

10. A method for detecting internal leakage of a ball valve, characterized in that: Based on a ball valve internal leakage detection system according to any one of claims 1 to 9 above, a ball valve internal leakage detection method comprises: S1, close the ball valve; S2. Unscrew the grease nozzle protection cap on one side of the ball valve; S3, connecting the tracer gas storage tank to the grease injection nozzle; S4, open the outlet valve to allow the tracer gas to enter the ball valve channel outside the valve seat sealing surface through the grease injection nozzle; S5. Open the valve cavity vent valve to vent the cavity, and use a tracer gas detector to detect at the valve cavity vent port; S6. If the tracer gas detector detects tracer gas, the valve seat sealing surface of the ball valve is leaking internally; S7. If the tracer gas detector cannot detect the tracer gas, the valve seat sealing surface of the ball valve is leak-free.

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