A gas valve sealing performance detection device and a detection method thereof

Abstract

The application relates to the technical field of gas valve sealing performance detection devices, in particular to a gas valve sealing performance detection device and a detection method thereof, which comprises a machine shell, a machine cover arranged on the machine shell, a spring, a pressure sensor and a gas mass spectrometer, a valve cavity is arranged between the machine shell and the machine cover, a valve core matched with the valve cavity is slidably arranged in the valve cavity, the pressure of a gas source is controlled through a gas source mechanism, displacement or static state of the valve core in the valve cavity is realized, the gas mass spectrometer is used for detecting the gas leakage amount of a dynamic seal or a static seal of a to-be-tested sealing ring on the valve core, meanwhile, the material, shape, sealing groove roughness on the valve core, roughness of an inner wall of the valve cavity and roughness processing technology of the to-be-tested sealing ring can be controlled separately or in combination according to test requirements, the flexibility of the test device is relatively large, the friction force between the to-be-tested sealing ring and a metal surface in the sealing test can be measured, the structure is simple, the cost is relatively low, the operation is simple, and the required test time is relatively short.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of gas valve sealing performance detection device, and particularly relates to a gas valve sealing performance detection device and a detection method thereof. BACKGROUND

[0002] The sealing performance of a valve is one of the most important performance requirements of the valve. The detection methods of the sealing performance of the valve mainly include static sealing test and dynamic sealing test. The two tests are generally performed after the valve is assembled. If the sealing performance is not good, it is not only very cumbersome to adjust and assemble again, but also requires a high cost of time and material processing.

[0003] For a gas valve, especially a hydrogen valve, the sealing is very difficult. Since the atomic radius of hydrogen is very small, not only the sealing ring needs to have good mechanical properties and hydrogen permeation resistance, but also the roughness of the metal surface in contact with the sealing ring is strictly required. At present, the roughness of the metal surface at the sealing position of the hydrogen valve is generally 0.2-0.3 μm. The inner cavity structure of the valve is very complex, and the size is relatively small. The cost required to achieve such a surface roughness is high. For the dynamic sealing performance of the gas valve, there are many influencing factors, such as the material of the sealing ring, the shape of the sealing ring, the roughness of the metal surface, the roughness processing technology, the friction between the sealing ring and the metal surface, etc. If the valve is assembled and then the influence of different factors on the sealing performance is studied, the cost of time and materials required is very huge.

[0004] In summary, the material of the sealing ring, the shape of the sealing ring, the roughness of the metal surface, the roughness processing technology, and the friction between the sealing ring and the metal surface all affect the sealing performance and cost of the hydrogen valve. There is no test device in the prior art that can simultaneously consider the above factors and test the sealing performance of the hydrogen valve simply, quickly and at low cost. SUMMARY

[0005] The present application solves the technical problem that the existing equipment detects the static sealing test and the dynamic sealing test, and the adjustment and assembly are not only very cumbersome, but also require a high cost of time and material processing. Therefore, the present application provides a gas valve sealing performance detection device and a detection method thereof.

[0006] The technical scheme adopted by the present application to solve its technical problems is: a gas valve sealing performance detection device, comprising a casing, a machine cover arranged on the casing, a spring, a pressure sensor and a gas mass spectrometer, the casing has a valve cavity, a valve core is arranged in the casing in a sliding manner, the valve core divides the valve cavity into a first cavity and a second cavity, a sealing groove is arranged on the valve core, a to-be-tested sealing ring is arranged in the sealing groove, the inner wall of the contact surface of the sealing groove and the to-be-tested sealing ring has a required surface roughness, the to-be-tested sealing ring is in sealing cooperation with the inner wall of the casing, the inner wall of the casing in contact with the to-be-tested sealing ring has a required surface roughness, the first cavity is in communication with a gas source mechanism, the gas source mechanism is used for conveying a gas with a required pressure into the first cavity and realizing control of displacement or stillness of the valve core in the valve cavity, a strain gauge is arranged in the casing, the strain gauge is located in the range of the contact surface of the to-be-tested sealing ring and the inner wall of the casing, the spring is arranged in the second cavity, one end of the spring is arranged against the bottom wall in the casing, the other end of the spring is arranged against the valve core, the pressure sensor is arranged in the second cavity, one end of the pressure sensor is arranged against the bottom wall in the casing, the other end of the pressure sensor is arranged against the valve core, a displacement detection mechanism for detecting displacement of the valve core is arranged on the casing, and the strain gauge is connected with a strain gauge.

[0007] The gas source mechanism comprises a gas cylinder, an air pressure power unit and an air compressor, the gas cylinder is filled with a required gas, the output end of the gas cylinder and the air compressor are in communication with the input end of the air pressure power unit, and the output end of the air pressure power unit is in communication with the first cavity. Compared with the prior art, the present scheme controls the pressure of the gas source through the gas source mechanism to realize displacement or stillness of the valve core in the valve cavity, detects the gas leakage of the to-be-tested sealing ring on the valve core by the gas mass spectrometer, and can control the material, shape, roughness of the sealing groove on the valve core, roughness of the inner wall of the valve cavity and roughness processing technology of the to-be-tested sealing ring separately or in combination according to the test requirements, so that the flexibility of the test device is large, and the friction between the to-be-tested sealing ring and the metal surface in the sealing test can be realized. The structure is simple, the cost is low, the operation is simple, and the required test time is short.

[0008] In order to facilitate observation of the output pressure of the air pressure power unit, preferably some embodiments, a pressure gauge is arranged on the output end of the air pressure power unit. The input pressure in the first cavity can be directly observed through the pressure gauge.

[0009] In order to facilitate control of the input of the required gas, preferably some embodiments, a valve is arranged between the output end of the gas cylinder and the input end of the air pressure power unit.

[0010] In order to realize the installation of the strain gauge on the machine shell, preferably some embodiments, the machine shell is provided with an annular installation groove at the upper end, the strain gauge is arranged at the bottom of the annular installation groove, the strain gauge is fixed at the side of the annular installation groove close to the test sealing ring, the annular installation groove is filled with rigid filler, and the strain gauge is located below the rigid filler. By providing an annular installation groove on the machine shell, the strain gauge is arranged at the bottom of the annular installation groove, and the rigid filler is filled in the upper part of the annular installation groove, which is used to support the annular installation groove and prevent the annular groove from deforming.

[0011] In some preferred embodiments, a gap is provided between the side of the annular installation groove away from the test sealing ring and the strain gauge.

[0012] In some preferred embodiments, the strain gauge is fixed on the inner wall of the annular installation groove by glue.

[0013] In order to ensure the sealing performance of the valve cavity during testing, preferably some embodiments, the machine shell and the machine cover are in static sealing cooperation, the upper end of the machine shell is provided with a step matched with the machine cover, and the end face and the side face of the step matched with the machine cover are respectively provided with an end face seal and a radial seal.

[0014] In some preferred embodiments, a guide belt is arranged on the contact surface of the valve core and the valve cavity, which is used to guide the displacement of the valve core.

[0015] A detection method using the gas valve sealing performance detection device as described above, characterized in that the specific operation steps are as follows:

[0016] S1, determine the material and shape of the test sealing ring, and the roughness value of the inner wall of the valve cavity and the inner wall of the sealing groove on the machine shell;

[0017] S2, install the guide belt on the valve core, and then install the test sealing ring in the sealing groove of the valve core;

[0018] S3, put the valve core into the valve cavity, and then cover the machine cover on the machine shell;

[0019] S4, open the valve, air compressor and air pressure power unit respectively, fill gas into the first cavity, and monitor the pressure by pressure gauge;

[0020] S5, fill the gas with the required pressure into the machine shell through the air pressure power unit, and realize the movement of the valve core by means of the spring, the displacement detection mechanism detects the movement distance of the valve core, and records the pressure value of the strain gauge F and the pressure value of the pressure sensor f , and through μ = f / FThe friction coefficient of the sealing ring to be tested can be calculated, or the position of the valve core does not change, so that the static sealing performance test can be realized, and the gas mass spectrometer detects the gas leakage amount of the sealing.

[0021] S6, after detection, the high pressure gas in the casing is unloaded by the gas pressure power unit.

[0022] In some preferred embodiments, the friction coefficient of the sealing ring to be tested is measured in step S5, and the calculation steps are as follows:

[0023] S5.1, measure the strain of the sealing ring to be tested at the contact with the inner wall of the casing by the strain gauge ε ;

[0024] S5.2, calculate the stress σ

[0025] The stress is calculated by the measured strain ε , through σ=Eε , wherein E is the elastic modulus;

[0026] S5.3, calculate the normal pressure of the sealing ring to be tested at the contact with the inner wall of the casing F :

[0027]

[0028] , wherein A is the contact area of the strain gauge and the casing, and the strain gauge is annular, A =2 πrh , wherein r is the radius of the annular mounting groove, h is the height of the strain gauge;

[0029] Therefore, F=Eε2πrh ;

[0030] S5.4, the pulling force required by the sealing ring to be tested to overcome the friction f is directly measured by the pressure sensor, and the friction coefficient is calculated according to the formula μ= f / F

[0031] ​The beneficial effects of the present application are: the gas valve sealing performance detection device and the detection method thereof can control the pressure of the gas source through the gas source mechanism, realize the displacement or static state of the valve core in the valve cavity, detect the gas leakage of the dynamic seal or static seal of the sealing ring on the valve core through the gas mass spectrometer, and can control the material, shape, sealing groove roughness of the valve core, the roughness of the inner wall of the valve cavity and the roughness processing technology of the sealing ring to be tested alone or in combination according to the test requirements. The flexibility of the test device is larger, and the friction between the sealing ring to be tested and the metal surface in the sealing test can be measured. The structure is simple, the cost is low, the operation is simple, the required test time is short, the static sealing test and the dynamic sealing test of the existing equipment are avoided, and the problems of very complicated adjustment and assembly, high time and material processing cost are solved. BRIEF DESCRIPTION OF DRAWINGS

[0032] The present application will be further described below in combination with the drawings and examples.

[0033] Figure 1 is a structural schematic diagram of the present application;

[0034] Figure 2 is Figure 1 is a partial enlarged view of A in

[0035] Figure 3 is a structural schematic diagram of the annular mounting groove in the present application.

[0036] In the figure: 1, cover, 2, machine shell, 3, valve core, 4, gas mass spectrometer, 5, adapter pipe, 6, spring, 7, pressure sensor, 8, plug, 9, displacement detection mechanism, 10, guide belt, 11, sealing ring to be tested, 12, strain gauge, 13, rigid packing, 14, O-ring, 15, air compressor, 16, gas cylinder, 17, air pressure power unit, 18, valve, 19, pressure gauge, 21, valve cavity, 22, sealing groove, 23, first cavity, 24, second cavity, 25, annular mounting groove, 26, step. DETAILED DESCRIPTION

[0037] The present application will be further described below in combination with the drawings and examples.

[0038] The present application is not limited to the following specific embodiments, and those skilled in the art can implement the present application in other various specific embodiments according to the disclosed content of the present application, or any simple changes or modifications made by using the design structure and ideas of the present application, all fall within the protection scope of the present application. It should be noted that the embodiments in the present application and the features in the embodiments can be combined with each other without conflict.

[0039] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicating orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, are only for the convenience of describing the invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the invention. Furthermore, the terms "first," "second," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined with "first," "second," etc., may explicitly or implicitly include one or more of that feature. In the description of this invention, unless otherwise stated, "a plurality of" means two or more.

[0040] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art will understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0041] Example 1, as Figures 1-3 As shown, a gas valve sealing performance testing device includes a housing 2, a cover 1, a connecting pipe 5, a spring 6, a pressure sensor 7, and a gas mass spectrometer 4. The cover 1 covers the housing 2, and a valve cavity 21 is provided between the housing 2 and the cover 1. A valve core 3 is slidably disposed inside the housing 2, dividing the valve cavity 21 into two chambers 23 and 24. A sealing groove 22 is provided on the valve core 3, and a sealing ring 11 to be tested is disposed in the sealing groove 22. The inner wall of the contact surface between the sealing groove 22 and the sealing ring 11 has a required surface roughness. The sealing ring 11 contacts the inner wall of the valve cavity 21 and forms a sealing surface. The inner wall of the valve cavity 21 in contact with the sealing ring 11 has a required surface roughness. In this embodiment, the metal surface roughness of the inner wall of the valve cavity 21 is generally 0.2-0.3. μmThe first cavity 23 is communicated with the gas source mechanism, the gas source mechanism is used for conveying the gas with the required pressure into the first cavity 23 and realizing the displacement or static of the valve core 3 in the valve cavity 21, the strain gauge 12 is arranged in the shell 2, the strain gauge 12 is located in the contact surface range of the sealing ring 11 to be tested and the inner wall of the shell 2, the inner wall of the shell 2 is located between the sealing ring 11 to be tested and the strain gauge 12, the spring 6 is arranged in the second cavity 24, one end of the spring 6 is abutted against the bottom wall in the shell 2, the other end of the spring 6 is abutted against the valve core 3, the pressure sensor 7 is arranged in the second cavity 24, one end of the pressure sensor 7 is abutted against the bottom wall in the shell 2, the other end of the pressure sensor 7 is abutted against the valve core 3, the displacement detection mechanism 9 for detecting the displacement of the valve core 3 is arranged on the shell 2, and the strain gauge 12 is connected with the strain gauge through the connecting wire.

[0042] The gas source mechanism includes the gas cylinder 16, the air pressure power unit 17 and the air compressor 15, the gas cylinder 16 is filled with the required gas, the output end of the gas cylinder 16 and the air compressor 15 are respectively communicated with the input end of the air pressure power unit 17, the output end of the air pressure power unit 17 is communicated with the first cavity 23 through the adapter pipe 5, the pressure gauge 19 is arranged on the output end of the air pressure power unit 17, and the valve 18 is arranged between the output end of the gas cylinder 16 and the input end of the air pressure power unit 17, in the embodiment, the gas cylinder 16 is filled with hydrogen or helium, so that the sealing performance comparison test of hydrogen or helium can be carried out, the air pressure power unit 17 mainly comprises a booster pump and related pipe valve components, the air compressor 15 drives the air pressure power unit 17 to work, the air pressure power unit 17 inputs the gas cylinder 16 and the air compressor 15, and the air pressure power unit 17 outputs the first cavity 23, and the pressure of the output end of the air pressure power unit 17 is higher than that of the gas cylinder 16.

[0043] The annular mounting groove 25 is arranged on the upper end of the shell 2, the strain gauge 12 is arranged at the bottom of the annular mounting groove 25, the strain gauge 12 is fixed by being bonded with glue on the side of the annular mounting groove 25 close to the sealing ring 11 to be tested, the annular mounting groove 25 is filled with the rigid filler 13, the strain gauge 12 is located below the rigid filler 13, there is a gap between the side of the annular mounting groove 25 away from the sealing ring 11 to be tested and the strain gauge 12, and the material of the rigid filler 13 is metal, for example, iron.

[0044] The shell 2 and the cover 1 have two static sealing cooperations, the step 26 is arranged on the cover 1, the step 26 is matched with the valve cavity 21, the step 26 is arranged in the valve cavity 21, the first sealing ring is arranged between the step 26 and the valve cavity 21 and forms the first sealing, and the second sealing ring is arranged between the end surface of the cover 1 and the end surface of the shell 2 and forms the second sealing, wherein the first sealing ring and the second sealing ring are both O-shaped sealing rings 14, the end surface and the side surface of the step 26 matched with the shell 2 and the cover 1 form the end surface sealing and the radial sealing respectively.

[0045] The valve core 3 and the contact surface of the valve cavity 21 are provided with a guide belt 10, which is used for guiding the displacement of the valve core 3, ensuring the stable and reliable displacement of the valve core 3. The bottom of the shell 2 is threadedly connected with a plug 8, one end of the plug 8 is located in the second cavity 24 and abuts against the pressure sensor 7. When detecting, the plug 8 needs to be installed on the shell 2, and after testing, the plug 8 is disassembled. By extending into the metal rod through the threaded hole, the valve core 3 and the pressure sensor 7 can be quickly pushed out.

[0046] Embodiment 2 is an application of embodiment 1, specifically: a detection method using the above-mentioned gas valve sealing performance detection device, the specific operation steps are as follows:

[0047] S1, determine the material and shape of the sealing ring 11 to be tested, and the roughness value of the inner wall of the valve cavity 21 and the inner wall of the sealing groove 22 on the shell 2;

[0048] S2, install the guide belt 10 on the valve core 3, and then install the sealing ring 11 to be tested in the sealing groove 22 of the valve core 3;

[0049] S3, put the valve core 3 into the valve cavity 21, and then cover the shell 2 with the cover 1;

[0050] S4, open the valve 18, air compressor 15 and air pressure power unit 17 respectively, fill gas into the first cavity 23, and monitor the pressure by the pressure gauge 19;

[0051] S5, fill the required pressure gas into the shell 2 through the air pressure power unit 17, and move the valve core 3 by means of the spring 6. The displacement detection mechanism 9 detects the displacement distance of the valve core 3, records the pressure value F of the strain gauge 12 and the pressure value f of the pressure sensor 7, and calculates the friction coefficient of the sealing ring 11 to be tested by μ=f / F, or the position of the valve core 3 does not change, which can realize the test of static sealing performance. At the same time, the gas mass spectrometer 4 can detect the gas leakage of the dynamic and static sealing of the sealing ring 11 to be tested;

[0052] In step S5, the calculation steps of measuring the friction coefficient of the sealing ring 11 to be tested are as follows:

[0053] S5.1, measure the strain of the sealing ring 11 to be tested and the inner wall of the shell 2 by the strain gauge ε The strain gauge 12 is compressed, and its resistance will decrease. The strain gauge 12 is stretched, and its resistance will increase. The change of the resistance is detected by the strain gauge to determine the strain on the strain gauge 12:

[0054]

[0055] wherein, ∆R is the change of the resistance of the strain gauge 12 caused by the strain,R 0 is the nominal resistance of the strain gauge 12, k is the strain coefficient of the strain gauge 12, ε is the strain to be measured, in this embodiment the measured strain ;

[0056] S5.2, calculating the stress σ

[0057] from the measured strain ε , the stress is calculated by σ=Eε where E is the modulus of elasticity, the material of the housing 2 is 316L, E about 193 GPa;

[0058] S5.3, calculating the normal pressure at the contact between the seal 11 to be tested and the inner wall of the housing 2 F :

[0059]

[0060] where A is the contact area of the strain gauge 12 with the housing 2, the strain gauge 12 is ring-shaped, A = 2 πrh where r is the radius of the ring-shaped mounting groove 25, r = 13 mm, h is the height of the strain gauge 12, h = 9 mm;

[0061] Therefore, N;

[0062] S5.4, the pulling force required by the seal 11 to be tested to overcome the friction f = 25.6 N is directly measured by the pressure sensor 7, according to the formula μ = f / F = 0.08 is the coefficient of friction, that is, when the spool 3 starts to move, the displacement of the displacement detection mechanism 9 will start to change, at this time the value of the pressure sensor 7 is f , the pressure sensor 7 is zeroed before aeration.

[0063] S6, after the detection is completed, the high-pressure gas in the housing 2 is unloaded by the pneumatic power unit 17.

[0064] The gas valve sealing performance detection device and the detection method thereof have the advantages that the structure is simple, the shape and material of the sealing ring 11 to be tested can be determined before testing, the surface roughness of the sealing groove 22 on the valve core 3 and the metal surface roughness of the inner wall of the valve cavity 21 on the shell are determined to complete the preliminary preparation work, then the sealing ring 11 to be tested is installed in the sealing groove 22 on the valve core 3, the valve core 3 is installed in the valve cavity 21, the cover 1 is covered on the shell 2, the assembly of the valve core 3 is completed, the next step of testing can be started, after the testing is completed, the cover 1 is disassembled, the plug 8 is loosened, and the pressure sensor 7 and the valve core 3 are pushed out, so that the operation is convenient and fast, the testing efficiency is high, and the testing cost is low.

[0065] The above-mentioned ideal embodiments according to the present application are for illustration, and related workers can make various changes and modifications without departing from the technical idea of the present application. The technical scope of the present application is not limited to the content of the specification, and must be determined according to the scope of claims.

Claims

1. A gas valve sealing performance testing device, comprising a housing (2) and a cover (1) disposed on the housing (2), characterized in that: It also includes a spring (6), a pressure sensor (7), and a gas mass spectrometer (4). The housing (2) has a valve chamber (21), and a valve core (3) is slidably disposed in the housing (2). The valve core (3) divides the valve chamber (21) into a first chamber (23) and a second chamber (24). A sealing groove (22) is provided on the valve core (3). A sealing ring (11) for testing is provided in the sealing groove (22). The inner wall of the contact surface between the sealing groove (22) and the sealing ring (11) has the required surface roughness. The sealing ring (11) for testing is sealed and fitted with the inner wall of the housing (2). The inner wall of the housing (2) in contact with the sealing ring (11) for testing has the required surface roughness. The first chamber (23) is connected to a gas source mechanism, which is used to supply gas to the first chamber (23). The gas required for the internal pressure is delivered and the valve core (3) is controlled to move or remain stationary in the valve cavity (21). A strain gauge (12) is provided in the housing (2). The strain gauge (12) is located within the contact area between the sealing ring (11) to be tested and the inner wall of the housing (2). A spring (6) is provided in the second cavity (24). One end of the spring (6) abuts against the bottom wall of the housing (2), and the other end of the spring (6) abuts against the valve core (3). A pressure sensor (7) is provided in the second cavity (24). One end of the pressure sensor (7) abuts against the bottom wall of the housing (2), and the other end of the pressure sensor (7) abuts against the valve core (3). A displacement detection mechanism (9) for detecting the displacement of the valve core (3) is provided on the housing (2). The strain gauge (12) is connected to the strain gauge. The gas source mechanism includes a gas cylinder (16), a pneumatic power unit (17), and an air compressor (15). The gas cylinder (16) contains the required gas. The output end of the gas cylinder (16) and the air compressor (15) are respectively connected to the input end of the pneumatic power unit (17). The output end of the pneumatic power unit (17) is connected to the first chamber (23).

2. The gas valve sealing performance testing device according to claim 1, characterized in that: A pressure gauge (19) is installed on the output end of the pneumatic power unit (17).

3. The gas valve sealing performance testing device according to claim 2, characterized in that: A valve (18) is provided between the output end of the gas cylinder (16) and the input end of the pneumatic power unit (17).

4. The gas valve sealing performance testing device according to claim 3, characterized in that: The upper end of the housing (2) is provided with an annular mounting groove (25), and the strain gauge (12) is set at the bottom of the annular mounting groove (25). The strain gauge (12) is fixed on the side of the annular mounting groove (25) near the sealing ring (11) to be tested. The annular mounting groove (25) is filled with rigid filler (13), and the strain gauge (12) is located below the rigid filler (13).

5. The gas valve sealing performance testing device according to claim 4, characterized in that: The annular mounting groove (25) has a gap between the side away from the sealing ring (11) to be tested and the strain gauge (12).

6. The gas valve sealing performance testing device according to claim 5, characterized in that: The strain gauge (12) is fixed to the inner wall of the annular mounting groove (25) by adhesive.

7. The gas valve sealing performance testing device according to claim 6, characterized in that: The upper end of the housing (2) has a step (26) that matches the cover (1). The end face and side face of the step (26) that matches the cover (1) are respectively provided with end face seal and radial seal.

8. The gas valve sealing performance testing device according to claim 7, characterized in that: A guide band (10) is provided on the contact surface between the valve core (3) and the valve cavity (21), and the guide band (10) is used to guide the valve core (3) when it is displaced.

9. A testing method using the gas valve sealing performance testing device as described in claim 8, characterized in that, The specific steps are as follows: S1. Determine the material and shape of the sealing ring (11) to be tested, as well as the roughness values ​​of the inner wall of the valve chamber (21) and the inner wall of the sealing groove (22) on the housing (2); S2. Install the guide belt (10) onto the valve core (3), and then install the sealing ring (11) to be tested into the sealing groove (22) of the valve core (3); S3. Place the valve core (3) into the valve cavity (21), and then place the cover (1) on the housing (2). S4. Open valve (18), air compressor (15) and pneumatic power unit (17) respectively, and fill gas into the first chamber (23), and monitor the pressure with pressure gauge (19); S5. Gas of the required pressure is injected into the housing (2) by the pneumatic power unit (17). With the help of the spring (6), the valve core (3) can be moved. The displacement detection mechanism (9) detects the movement distance of the valve core (3) and records the pressure value of the strain gauge (12). F and the pressure value of the pressure sensor (7) f and through μ = f / F The friction coefficient of the sealing ring (11) to be tested can be calculated, or the position of the valve core (3) will not change, so the static sealing performance test can be realized. At the same time, the gas mass spectrometer (4) detects the amount of gas leakage of the seal. S6. After the test is completed, the high-pressure gas in the housing (2) is unloaded through the pneumatic power unit (17).

10. The testing method of the gas valve sealing performance testing device according to claim 9, characterized in that, The calculation steps for measuring the friction coefficient of the seal ring (11) under test in step S5 are as follows: S5.1 Measure the strain at the contact point between the sealing ring (11) to be tested and the inner wall of the housing (2) using a strain gauge. ε ; S5.2, Calculation of Stress σ From the measured strain ε ,pass σ=Eε The calculated stress, of which E It is the elastic modulus; S5.3 Calculate the normal pressure at the contact point between the seal (11) to be tested and the inner wall of the housing (2). F : ； in, A The contact area between the strain gauge (12) and the housing (2) is [missing information]. The strain gauge (12) is annular. A =2 πrh ,in r The radius of the annular mounting groove (25) is... h The height of strain gauge (12); therefore, F=Eε2πrh ; S5.4, The pressure required for the test sealing ring (11) to overcome friction. f The pressure is directly measured by the pressure sensor (7), according to the formula. μ=f / F The coefficient of friction was calculated.

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