Liquid hydrogen valve testing device and testing method thereof
By designing a liquid hydrogen valve testing device to simulate the complex working conditions of liquid hydrogen valves, and employing methods such as indirect measurement and vacuum chamber purging, the problem of the lack of testing standards for liquid hydrogen valves was solved, thereby improving safety and accuracy.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-10-14
- Publication Date
- 2026-04-07
AI Technical Summary
Existing testing standards for liquid hydrogen valves are lacking in the civilian sector, and traditional testing techniques cannot simulate the complex operating conditions of liquid hydrogen valves in real-world environments, posing safety hazards.
A liquid hydrogen valve testing device was designed, including a pressurization pipeline, a liquid hydrogen pipeline, a liquid reservoir, and a vacuum chamber. By simulating the complex working conditions of a liquid hydrogen valve, the device uses indirect measurement methods to evaluate the valve's internal leakage, external leakage, and flowability. The device also utilizes a vacuum chamber and helium purging to improve testing safety.
This enabled comprehensive testing of liquid hydrogen valves, improved the assessment of sealing performance, low-temperature resistance and structural integrity, reduced the risk of liquid hydrogen leakage, and enhanced the safety and accuracy of the tests.
Smart Images
Figure CN121804756A_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The present application relates to the technical field of liquid hydrogen, in particular to a liquid hydrogen valve testing device and a testing method thereof. BACKGROUND
[0002] Liquid hydrogen is a clean energy carrier with high energy density and low transportation cost. Liquid hydrogen storage tanks, tank cars, pipelines and other equipment are the core components of hydrogen energy infrastructure. As the key control components of these equipment, the performance of valves is directly related to the sealing safety and operating efficiency of the entire liquid hydrogen system. Liquid hydrogen valves work in an ultra-low temperature environment of -253℃ for a long time, facing extreme working condition challenges.
[0003] Hydrogen molecules have the characteristics of small volume and easy penetration, which can easily cause hydrogen embrittlement of materials, leading to deformation or failure of metal seals, and further causing leakage. Once liquid hydrogen leaks, it will quickly vaporize and form a flammable gas mixture, posing a significant risk of burning or even explosion. Therefore, strict testing of the sealing performance, low temperature resistance and structural integrity of liquid hydrogen valves is an important barrier to prevent safety accidents.
[0004] Currently, liquid hydrogen technology has been limited to the aerospace field for a long time, and there has been a long-term lack of testing standards for liquid hydrogen valves in the civil field. At the same time, traditional testing technologies such as immersion cooling method can only test the performance of valves under simplified conditions, which is quite different from the real operating environment of liquid hydrogen valves. SUMMARY
[0005] The purpose of the present application is to provide a liquid hydrogen valve testing device and a testing method thereof, which simulates complex working conditions such as water hammer of liquid hydrogen valves through devices such as liquid reservoirs, and comprehensively evaluates the performance of valve internal leakage, external leakage and flowability through indirect measurement.
[0006] In order to achieve the above purpose, the present application adopts the following technical solutions: A liquid hydrogen valve testing device, comprising a booster pipeline, a liquid hydrogen pipeline, a liquid hydrogen tank, a liquid reservoir, a test liquid hydrogen valve, a vacuum chamber, an exhaust pipeline, a vacuum pipeline and a discharge pipeline, the front end of the booster pipeline is connected to a helium bottle group, the rear end is divided into two branches, the first branch is connected to a helium stop valve and a liquid hydrogen tank in sequence to provide pressure for the liquid hydrogen tank, the second branch is connected to a helium solenoid valve and a vacuum chamber in sequence to provide purge helium for the vacuum chamber; The front end of the liquid hydrogen pipeline is connected to the liquid hydrogen tank, the rear end is divided into two branches, the first branch is connected to a liquid hydrogen stop valve, a liquid reservoir, a liquid hydrogen solenoid valve and a test liquid hydrogen valve in sequence to provide liquid hydrogen medium and real operating environment for the test liquid hydrogen valve, the second branch is connected to a standard liquid hydrogen valve as a flowability comparison for the test liquid hydrogen valve, and then the first branch and the second branch are merged; The exhaust pipeline is connected with the vacuum chamber, the first stop valve and the exhaust pipeline in sequence, and the gas in the vacuum chamber is discharged through the exhaust pipeline. The vacuum pipeline is connected with the vacuum chamber, the second stop valve and the vacuum pump in sequence, and the vacuum function of the vacuum chamber is realized. The exhaust pipeline is connected with the liquid hydrogen pipeline, the flow meter and the vaporizer in sequence, and the re-warming and vaporization of the liquid hydrogen medium are realized. The liquid accumulator, the liquid hydrogen electromagnetic valve and the test liquid hydrogen valve are arranged in sequence with the same center in the vertical height, and the test liquid hydrogen valve is located in the vacuum chamber, and the liquid hydrogen electromagnetic valve is quickly opened to provide the test liquid hydrogen valve with complex working condition simulation such as water hammer.
[0007] As a further description of the above technical solution: The vacuum gauge and the hydrogen concentration sensor are arranged in sequence on the vacuum chamber, and the vacuum degree and the hydrogen concentration value in the vacuum chamber can be measured.
[0008] As a further description of the above technical solution: The helium electromagnetic valve, the liquid hydrogen electromagnetic valve, the vacuum gauge and the hydrogen concentration sensor are connected to the controller through the signal line, and the controller controls the helium electromagnetic valve and the liquid hydrogen electromagnetic valve according to the values of the vacuum gauge and the hydrogen concentration sensor.
[0009] As a further description of the above technical solution: The liquid hydrogen pipeline and its valve need to be insulated to prevent two-phase flow caused by vaporization of liquid hydrogen.
[0010] As a further description of the above technical solution: The vacuum pump is arranged in a multi-stage series to improve the vacuum degree in the vacuum chamber.
[0011] As a further description of the above technical solution: The vaporizer is selected from one of the air temperature type vaporizer and the water bath type vaporizer to improve the temperature of the hydrogen medium passing through the exhaust pipeline and prevent solid air from being generated.
[0012] As a further description of the above technical solution: A liquid hydrogen valve testing method, comprising the following steps: S100, vacuum stage: open the second stop valve, start the vacuum pump, and under the action of the vacuum pump, the vacuum chamber reaches a vacuum state, and then the second stop valve and the vacuum pump are closed; S200, liquid hydrogen delivery stage: open the helium stop valve, liquid hydrogen stop valve, liquid hydrogen solenoid valve and test liquid hydrogen valve, the high pressure helium of helium cylinder group enters the liquid hydrogen tank through the booster pipeline, then the liquid hydrogen in the liquid hydrogen tank enters the liquid hydrogen pipeline under the action of pressure difference, and then flows through the liquid accumulator, liquid hydrogen solenoid valve and test liquid hydrogen valve in turn through the liquid hydrogen stop valve, and finally enters the discharge pipeline, and is discharged at high altitude after being measured by the flowmeter and heated by the vaporizer; when the liquid accumulator is full, the liquid hydrogen solenoid valve and the test liquid hydrogen valve are closed, and the valve test is prepared; the controller sends a high-frequency start-stop signal to the liquid hydrogen solenoid valve through a signal line, and the liquid hydrogen in the liquid accumulator rapidly impacts and closes the test liquid hydrogen valve under the action of the height difference; S300, liquid hydrogen valve leakage test: the vacuum gauge tests the vacuum degree in the vacuum chamber, if the test liquid hydrogen valve leaks, the vacuum degree in the vacuum chamber will decrease obviously, and the concentration value of the hydrogen concentration sensor is verified; when the values of the vacuum gauge and the hydrogen concentration sensor do not change, it indicates that the test liquid hydrogen valve does not leak; when the values of the vacuum gauge and the hydrogen concentration sensor change, it indicates that the test liquid hydrogen valve leaks, at this time, the liquid hydrogen solenoid valve is closed, the first stop valve is opened, and the helium solenoid valve is opened by the controller, the high pressure helium in the helium cylinder group is used to purge the vacuum chamber, the hydrogen concentration after leakage is reduced, the gas after purging is discharged through the discharge pipeline, and the valve leakage test is completed. S400, liquid hydrogen valve leakage test: when the liquid hydrogen in the liquid accumulator impacts and closes the test liquid hydrogen valve, whether the flowmeter has a real number is observed, since the test liquid hydrogen valve is in a closed state, when the test liquid hydrogen valve leaks, the flowmeter can read the flow value, when the test liquid hydrogen valve does not leak, the flow value of the flowmeter is zero, and the valve leakage test is completed. S500, liquid hydrogen valve flow test: the test liquid hydrogen valve is opened by the controller, the liquid hydrogen in the liquid hydrogen pipeline flows through the impacted test liquid hydrogen valve, and the corresponding flow value is read by the flowmeter; then the standard liquid hydrogen valve is opened, the liquid hydrogen stop valve is closed, the current flow value is read by the flowmeter, and compared with the previous flow value, if the previous flow value is less than the current flow value, it indicates that the flow of the impacted test liquid hydrogen valve is damaged, if the flow values before and after are the same, it indicates that the flow of the test liquid hydrogen valve is not affected, and the valve flow test is completed.
[0013] Further description of the above technical solution: Before the S100 step, it is ensured that the test system has completed displacement, and all valves are in a closed state.
[0014] As described above, due to the adoption of the above technical solution, the beneficial effects of the present application are: In this invention, by arranging a liquid reservoir and a liquid hydrogen solenoid valve concentrically in the vertical direction, a complex operating environment, such as water hammer, can be provided for testing the liquid hydrogen valve, thus enhancing the dimensionality of the liquid hydrogen valve test. The test liquid hydrogen valve is placed in a vacuum chamber, and a vacuum gauge can be used to quickly detect external leaks in the test liquid hydrogen valve. By combining it with a hydrogen concentration sensor, the detection accuracy of external leaks is improved. The internal leaks of the test liquid hydrogen valve are tested using a flow meter, and compared with a standard liquid hydrogen valve, achieving a comprehensive test of valve internal leaks and flowability. The test liquid hydrogen valve is located inside the vacuum chamber and is connected to high-purity helium. After a leak occurs in the valve, helium can be used for rapid purging to reduce the hydrogen concentration inside the vacuum chamber, improving the safety of the complex liquid hydrogen valve testing process. Attached Figure Description
[0015] Figure 1 This is a system architecture diagram of a liquid hydrogen valve testing device proposed in this invention; Figure 2 This is a flowchart illustrating the workflow of a liquid hydrogen valve testing method proposed in this invention.
[0016] Explanation of reference numerals in the attached figures: 1. Pressurization line; 2. Helium cylinder assembly; 3. Helium shut-off valve; 4. Helium solenoid valve; 5. Liquid hydrogen line; 6. Liquid hydrogen tank; 7. Standard liquid hydrogen valve; 8. Flow meter; 9. Liquid hydrogen shut-off valve; 10. Receiver; 11. Liquid hydrogen solenoid valve; 12. Test liquid hydrogen valve; 13. Vacuum chamber; 14. Vacuum gauge; 15. Hydrogen concentration sensor; 16. Exhaust line; 17. First shut-off valve; 18. Vacuum pump line; 19. Second shut-off valve; 20. Vacuum pump; 21. Discharge line; 22. Vaporizer; 23. Signal line; 24. Controller. Detailed Implementation
[0017] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.
[0018] Please see Figure 1 and Figure 2 The present invention provides a technical solution: a liquid hydrogen valve testing device, comprising a pressurization pipeline 1, a liquid hydrogen pipeline 5, a liquid hydrogen tank 6, a liquid storage container 10, a test liquid hydrogen valve 12, a vacuum chamber 13, an exhaust pipeline 16, a vacuum pumping pipeline 18, and a discharge pipeline 21. The front end of the pressurization pipeline 1 is connected to a helium cylinder group 2, and the rear end is divided into two branches. The first branch is connected in sequence to a helium shut-off valve 3 and a liquid hydrogen tank 6 to provide pressure to the liquid hydrogen tank 6. The second branch is connected in sequence to a helium solenoid valve 4 and a vacuum chamber 13 to provide purging helium to the vacuum chamber 13. The front end of the liquid hydrogen pipeline 5 is connected to the liquid hydrogen tank 6, and the rear end is divided into two branches. The first branch is connected in sequence to the liquid hydrogen shut-off valve 9, the liquid storage tank 10, the liquid hydrogen solenoid valve 11 and the test liquid hydrogen valve 12, providing liquid hydrogen medium and real operating environment for the test liquid hydrogen valve 12. The second branch is connected to the standard liquid hydrogen valve 7 as a flow comparison of the test liquid hydrogen valve 12. Then the first branch and the second branch are merged. The exhaust pipe 16 is connected in sequence to the vacuum chamber 13, the first shut-off valve 17 and the exhaust pipe 21, so that the gas inside the vacuum chamber 13 is discharged through the exhaust pipe 21. The vacuum line 18 is connected in sequence to the vacuum chamber 13, the second shut-off valve 19 and the vacuum pump 20 to realize the vacuum pumping function inside the vacuum chamber 13. The discharge pipeline 21 is connected in sequence to the liquid hydrogen pipeline 5, the flow meter 8 and the vaporizer 22 to realize the reheating and vaporization discharge of the liquid hydrogen medium; The liquid storage tank 10, the liquid hydrogen solenoid valve 11, and the test liquid hydrogen valve 12 are arranged in a circle with the same center in the vertical height. The test liquid hydrogen valve 12 is located inside the vacuum chamber 13. The rapid opening of the liquid hydrogen solenoid valve 11 provides simulation of complex working conditions such as water hammer for the test liquid hydrogen valve 12.
[0019] Specifically, such as Figure 1 As shown, a vacuum gauge 14 and a hydrogen concentration sensor 15 are sequentially installed on the vacuum chamber 13, which can measure the vacuum level and hydrogen concentration inside the vacuum chamber 13.
[0020] Specifically, such as Figure 1 As shown, the helium solenoid valve 4, the liquid hydrogen solenoid valve 11, the vacuum gauge 14, and the hydrogen concentration sensor 15 are connected to the controller 24 via the signal line 23. The controller 24 controls the helium solenoid valve 4 and the liquid hydrogen solenoid valve 11 based on the values of the vacuum gauge 14 and the hydrogen concentration sensor 15.
[0021] Specifically, such as Figure 1 As shown, liquid hydrogen pipeline 5 and its valves must be insulated to prevent liquid hydrogen from vaporizing and generating two-phase flow.
[0022] Specifically, such as Figure 1 As shown, the vacuum pump 20 adopts a multi-stage series arrangement to improve the vacuum level inside the vacuum chamber 13.
[0023] Specifically, such as Figure 1 As shown, vaporizer 22 is selected from either an ambient temperature vaporizer or a water bath vaporizer to increase the temperature of the hydrogen medium passing through the discharge pipe 21 and prevent solid cavitation.
[0024] Specifically, such as Figure 1 and Figure 2As shown, the operating principle and steps of a liquid hydrogen valve testing method based on the above-mentioned liquid hydrogen valve testing device are as follows: Before testing, ensure that the test system has been replaced and that all valves are closed.
[0025] (1) Vacuuming stage: Open the second shut-off valve 19 and start the vacuum pump 20. Under the action of the vacuum pump 20, the vacuum chamber 13 reaches a vacuum state. Then close the second shut-off valve 19 and the vacuum pump 20. (2) Liquid hydrogen delivery stage: Open helium shut-off valve 3, liquid hydrogen shut-off valve 9, liquid hydrogen solenoid valve 11 and test liquid hydrogen valve 12. High-pressure helium from helium cylinder group 2 enters liquid hydrogen tank 6 through pressurization pipeline 1. Then, under the action of pressure difference, liquid hydrogen inside liquid hydrogen tank 6 enters liquid hydrogen pipeline 5 and flows through liquid hydrogen shut-off valve 9 in sequence through liquid storage tank 10, liquid hydrogen solenoid valve 11 and test liquid hydrogen valve 12, and finally enters discharge pipeline 21. After being metered by flow meter 8 and heated by vaporizer 22, it is discharged at high altitude. When liquid storage tank 10 is full, liquid hydrogen solenoid valve 11 and test liquid hydrogen valve 12 are closed to prepare for valve testing. Controller 24 sends high-frequency start and stop signals to liquid hydrogen solenoid valve 11 through signal line 23. Liquid hydrogen inside liquid storage tank 10 is quickly closed by liquid hydrogen solenoid valve 11 under the action of height difference and then tested liquid hydrogen valve 12. (3) Liquid hydrogen valve leakage test: Vacuum gauge 14 tests the vacuum level inside vacuum chamber 13. Since the vacuum chamber 13 is in a vacuum state, if the liquid hydrogen valve 12 leaks, the vacuum level inside vacuum chamber 13 will be significantly reduced and verified by the concentration value of hydrogen concentration sensor 15. When the values of vacuum gauge 14 and hydrogen concentration sensor 15 do not change, it indicates that the liquid hydrogen valve 12 has not leaked. When the values of vacuum gauge 14 and hydrogen concentration sensor 15 change, it indicates that the liquid hydrogen valve 12 has leaked. At this time, the liquid hydrogen solenoid valve 11 is closed, the first shut-off valve 17 is opened, and the helium solenoid valve 4 is opened through controller 24. The high-pressure helium in helium cylinder group 2 is used to purge the vacuum chamber 13 to reduce the hydrogen concentration after leakage. The purged gas is discharged through the discharge pipe 21 to complete the valve leakage test. (4) Liquid hydrogen valve internal leakage test: When testing the liquid hydrogen valve 12 after the liquid hydrogen inside the reservoir 10 is closed by impact, observe whether the flow meter 8 has a real value. Since the liquid hydrogen valve 12 is in the closed state, when the liquid hydrogen valve 12 has internal leakage, the flow meter 8 can read the flow value. When the liquid hydrogen valve 12 does not have internal leakage, the flow value of the flow meter 8 is zero, and the valve internal leakage test is completed. (5) Liquid hydrogen valve flowability test: Open the test liquid hydrogen valve 12 through the controller 24. The liquid hydrogen in the liquid hydrogen pipeline 5 flows through the test liquid hydrogen valve 12 after the impact. Read the corresponding flow value through the flow meter 8. Then open the standard liquid hydrogen valve 7 and close the liquid hydrogen shut-off valve 9. Read the current flow value through the flow meter 8 and compare it with the previous flow value. If the previous flow value is less than the current value, it indicates that the flowability of the test liquid hydrogen valve 12 after the impact is damaged. If the flow values before and after are the same, it indicates that the flowability of the test liquid hydrogen valve 12 is not affected, and the valve flowability test is completed.
[0026] The above description is only a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the technical solution and inventive concept of the present invention, should be covered within the scope of protection of the present invention.
Claims
1. A liquid hydrogen valve testing device, characterized in that, It includes a pressurization pipeline (1), a liquid hydrogen pipeline (5), a liquid hydrogen tank (6), a liquid storage container (10), a test liquid hydrogen valve (12), a vacuum chamber (13), an exhaust pipeline (16), a vacuum pumping pipeline (18), and a discharge pipeline (21). The pressurization pipeline (1) is connected to a helium cylinder group (2) at the front end and is divided into two branches at the rear end. The first branch is connected to a helium shut-off valve (3) and a liquid hydrogen tank (6) in sequence to provide pressure to the liquid hydrogen tank (6). The second branch is connected to a helium solenoid valve (4) and a vacuum chamber (13) in sequence to provide purging helium to the vacuum chamber (13). The liquid hydrogen pipeline (5) is connected to the liquid hydrogen tank (6) at the front end and is divided into two branches at the rear end. The first branch is connected to the liquid hydrogen shut-off valve (9), the liquid storage tank (10), the liquid hydrogen solenoid valve (11) and the test liquid hydrogen valve (12) in sequence, providing liquid hydrogen medium and real operating environment for the test liquid hydrogen valve (12). The second branch is connected to the standard liquid hydrogen valve (7) as a flow comparison of the test liquid hydrogen valve (12). Then the first branch and the second branch are merged. The exhaust pipe (16) is connected in sequence to the vacuum chamber (13), the first shut-off valve (17) and the exhaust pipe (21) to discharge the gas inside the vacuum chamber (13) through the exhaust pipe (21); The vacuum pipeline (18) is connected in sequence to the vacuum chamber (13), the second shut-off valve (19) and the vacuum pump (20) to realize the vacuum pumping function inside the vacuum chamber (13); The discharge pipeline (21) is connected in sequence to the liquid hydrogen pipeline (5), the flow meter (8) and the vaporizer (22) to realize the reheating and vaporization discharge of the liquid hydrogen medium; The liquid storage tank (10), the liquid hydrogen solenoid valve (11) and the test liquid hydrogen valve (12) are arranged in a circle with the same center in the vertical height. The test liquid hydrogen valve (12) is located inside the vacuum chamber (13). By quickly opening the liquid hydrogen solenoid valve (11), the test liquid hydrogen valve (12) is provided with simulation of complex working conditions such as water hammer.
2. The liquid hydrogen valve testing device according to claim 1, characterized in that, The vacuum chamber (13) is equipped with a vacuum gauge (14) and a hydrogen concentration sensor (15) in sequence, which can measure the vacuum level and hydrogen concentration inside the vacuum chamber (13).
3. The liquid hydrogen valve testing device according to claim 1, characterized in that, The helium solenoid valve (4), liquid hydrogen solenoid valve (11), vacuum gauge (14), and hydrogen concentration sensor (15) are connected to the controller (24) via signal line (23). The controller (24) controls the helium solenoid valve (4) and liquid hydrogen solenoid valve (11) based on the values of the vacuum gauge (14) and hydrogen concentration sensor (15).
4. The liquid hydrogen valve testing device according to claim 1, characterized in that, The liquid hydrogen pipeline (5) and its valves must be insulated to prevent liquid hydrogen from vaporizing and generating two-phase flow.
5. The liquid hydrogen valve testing device according to claim 1, characterized in that, The vacuum pump (20) is arranged in a multi-stage series configuration to improve the vacuum level inside the vacuum chamber (13).
6. The liquid hydrogen valve testing device according to claim 1, characterized in that, The vaporizer (22) is either an ambient temperature vaporizer or a water bath vaporizer, in order to increase the temperature of the hydrogen medium passing through the discharge pipe (21) and prevent solid cavitation.
7. The liquid hydrogen valve testing method according to claim 1, characterized in that, The process includes the following steps: S100, Vacuuming stage: Open the second shut-off valve (19), start the vacuum pump (20), and under the action of the vacuum pump (20), the vacuum chamber (13) reaches a vacuum state. Then close the second shut-off valve (19) and the vacuum pump (20). S200, Liquid Hydrogen Delivery Stage: Open the helium shut-off valve (3), liquid hydrogen shut-off valve (9), liquid hydrogen solenoid valve (11), and test liquid hydrogen valve (12). The high-pressure helium in the helium cylinder group (2) enters the liquid hydrogen tank (6) through the pressurization pipeline (1). Then, under the action of pressure difference, the liquid hydrogen inside the liquid hydrogen tank (6) enters the liquid hydrogen pipeline (5) and flows through the liquid hydrogen shut-off valve (9) in sequence through the storage tank (10), liquid hydrogen solenoid valve (11), and test liquid hydrogen valve (12), and finally enters the discharge pipe. The flow path (21) is metered by the flow meter (8) and heated by the vaporizer (22) before being discharged into the atmosphere. When the reservoir (10) is full, the liquid hydrogen solenoid valve (11) and the test liquid hydrogen valve (12) are closed to prepare for valve testing. The controller (24) sends a high-frequency start and stop signal to the liquid hydrogen solenoid valve (11) through the signal line (23). Under the action of the height difference, the liquid hydrogen inside the reservoir (10) is quickly impacted and closed by the liquid hydrogen solenoid valve (11) before the test liquid hydrogen valve (12) is closed. S300, Liquid Hydrogen Valve External Leakage Test: Vacuum gauge (14) tests the vacuum level inside the vacuum chamber (13). Since the vacuum chamber (13) is in a vacuum state, if the test liquid hydrogen valve (12) leaks, the vacuum level inside the vacuum chamber (13) will be significantly reduced, and the concentration value of the hydrogen concentration sensor (15) will be mutually verified. When the values of the vacuum gauge (14) and the hydrogen concentration sensor (15) do not change, it indicates that the test liquid hydrogen valve (12) has not leaked. When the values of the vacuum gauge (14) and the hydrogen concentration sensor (15) change, it indicates that the test liquid hydrogen valve (12) has leaked. At this time, the liquid hydrogen solenoid valve (11) is closed, and the first shut-off valve (17) is opened and the helium solenoid valve (4) is opened through the controller (24). The high-pressure helium in the helium cylinder group (2) is used to purge the vacuum chamber (13) to reduce the hydrogen concentration after leakage. The purged gas is discharged through the discharge pipe (21) to complete the valve external leakage test. S400, Liquid Hydrogen Valve Internal Leakage Test: When testing the liquid hydrogen valve (12) after the liquid hydrogen impact is closed inside the reservoir (10), observe whether the flow meter (8) has a real number. Since the test liquid hydrogen valve (12) is in the closed state, when the test liquid hydrogen valve (12) has internal leakage, the flow meter (8) can read the flow value. When the test liquid hydrogen valve (12) does not have internal leakage, the flow value of the flow meter (8) is zero, and the valve internal leakage test is completed. S500, Liquid Hydrogen Valve Flowability Test: Open the test liquid hydrogen valve (12) through the controller (24), and the liquid hydrogen in the liquid hydrogen pipeline (5) flows through the test liquid hydrogen valve (12) after the impact. Read the corresponding flow value through the flow meter (8); then open the standard liquid hydrogen valve (7) and close the liquid hydrogen shut-off valve (9). Read the current flow value through the flow meter (8) and compare it with the previous flow value. If the previous flow value is less than the current value, it indicates that the flowability of the test liquid hydrogen valve (12) after the impact is damaged. If the flow values before and after are the same, it indicates that the flowability of the test liquid hydrogen valve (12) is not affected, and the valve flowability test is completed.
8. The liquid hydrogen valve testing method according to claim 7, characterized in that, Before step S100, ensure that the test system has been replaced and that all valves are closed.