Device and method for testing air leakage of rotary valve

Abstract

The invention provides a rotary valve air leakage testing device and method, and belongs to the technical field of rotary valves. The device comprises a test platform frame, wherein the test platform frame comprises a top plate and a bottom plate; a hydraulic transmission assembly is arranged on the top plate, and the lower end of the hydraulic transmission assembly is connected with an upper pressing disc through a connecting short pipe. A pulley is slidably arranged on the bottom plate, a lower pressure plate is arranged on the pulley, and a rotary valve is fixed between the upper pressure plate and the lower pressure plate; a through hole is formed in the lower pressing disc and connected with a gas control unit through a conveying pipeline, and a gas flow meter is arranged on the output pipeline. According to the invention, the air leakage test of the rotary valve of the same model under different pressures and temperatures can be realized; and the air leakage test of different models of rotary valves can be realized, and the test result is accurate.

Description

Technical Field

[0001] This invention belongs to the field of rotary valve technology, specifically relating to a rotary valve leakage test device and method. Background Technology

[0002] Rotary valves, as key equipment in pneumatic powder conveying, are widely used in industries such as chemical, petroleum, metallurgy, power, cement, and pharmaceutical. Their working principle involves a motor driving an impeller with an equally spaced structure to rotate within a housing. Material from the upper hopper or feeding device fills the impeller's cavity, and as the impeller rotates, the material is discharged from the lower part of the housing, allowing for continuous and uniform downstream discharge according to the requirements of the conveying system.

[0003] Rotary valve housings and impellers are typically manufactured from different metals. Due to the varying coefficients of thermal expansion of these metals, machining precision, and different operating conditions, the leakage rate of the rotary valve can be affected. Leakage impacts both the stability and energy consumption of the pneumatic conveying system; excessive leakage can lead to system instability or even system shutdown due to material feeding failure. As a core parameter of the rotary valve, leakage rate plays a decisive role in the stability and energy consumption of the conveying system. Currently, there is no publicly available literature in China detailing methods for testing the leakage rate of rotary valves.

[0004] Therefore, the urgent problem to be solved is to develop a device and method for testing the leakage of rotary valves. Summary of the Invention

[0005] The purpose of this invention is to solve the problems existing in the prior art and provide a rotary valve leakage test device and method that can accurately test the leakage of the rotary valve.

[0006] This invention is achieved through the following technical solution:

[0007] In a first aspect, the present invention provides a rotary valve leakage test device, comprising a test platform frame, the test platform frame comprising a top plate and a bottom plate;

[0008] The top plate is equipped with a hydraulic transmission assembly, and the lower end of the hydraulic transmission assembly is connected to an upper pressure plate through a connecting short pipe.

[0009] A trolley is slidably mounted on the base plate, and a lower pressure plate is mounted on the trolley. The upper pressure plate and the lower pressure plate are used to fix a rotary valve.

[0010] The pressure plate is provided with a through hole, which is connected to the gas control unit through a delivery pipeline, and a gas flow meter is provided on the output pipeline.

[0011] A further improvement of the present invention is that:

[0012] The upper pressure plate includes an upper pressure plate body. The lower end face of the upper pressure plate body is provided with a first protrusion extending downward. The first protrusion is provided with a plurality of first annular steps. The outer diameter of the plurality of first annular steps decreases from top to bottom. The outer surface of each first annular step is provided with threads for engagement with the rotary valve inlet.

[0013] A further improvement of the present invention is that:

[0014] The lower pressure plate includes a lower pressure plate base and a lower pressure plate body. The upper surface of the lower pressure plate base is provided with a groove, and the lower pressure plate body is disposed in the groove.

[0015] The lower pressure plate base is provided with a plurality of first bolt holes for fixed connection with the trolley.

[0016] A further improvement of the present invention is that:

[0017] The upper end face of the pressure plate body is provided with an upwardly extending second protrusion. The second protrusion is provided with a plurality of second annular steps. The outer diameter of the plurality of second annular steps decreases from bottom to top. The outer surface of each second annular step is provided with threads.

[0018] A further improvement of the present invention is that:

[0019] A first through hole is provided at the center of the lower pressure plate body;

[0020] A second through hole is provided at the center of the lower pressure plate base;

[0021] The first through hole and the second through hole are connected to form the through hole.

[0022] A further improvement of the present invention is that:

[0023] The trolley includes a trolley top plate, and two support legs are provided on the lower end face of the trolley top plate. Each of the two support legs is provided with a slider, and the two sliders are slidably connected to the two trolley guide rails respectively.

[0024] The lower end face of the trolley top plate is also provided with at least one support plate. The support plate is located between the two support legs and is perpendicular to the trolley guide rail. The support plate is provided with bolt holes, and the positions of the bolt holes on each support plate are corresponding.

[0025] A further improvement of the present invention is that:

[0026] A central through hole is provided on the top plate of the trolley. The position of the central through hole is adapted to the position of the second through hole on the lower pressure plate base. The central through hole is connected to the conveying pipeline through a flexible hose.

[0027] The trolley top plate is also provided with a plurality of second bolt holes, the position and number of which correspond to the position and number of first bolt holes provided on the lower pressure plate base.

[0028] A further improvement of the present invention is that:

[0029] The rotary valve leakage test device also includes an electric heating component, which is located on the outside of the rotary valve and encloses it.

[0030] A further improvement of the present invention is that,

[0031] The rotary valve leakage test device also includes a temperature sensor, which is installed on the rotary valve or the electric heating assembly.

[0032] A second aspect of the present invention provides a method for testing the leakage of a rotary valve, wherein the above-mentioned rotary valve leakage testing device is used to test the leakage of the rotary valve, specifically:

[0033] First, fix the lower pressure plate on the trolley. Then, after engaging the outlet of the rotary valve with the lower pressure plate, slide the trolley to the corresponding position, engage the upper pressure plate with the inlet of the rotary valve, and then connect the upper pressure plate to the hydraulic transmission assembly through the connecting short pipe. By controlling the hydraulic transmission assembly, press the upper pressure plate, rotary valve and lower pressure plate together to prevent air leakage.

[0034] The rotary valve is heated by an electric heating element to reach the set test temperature. Gas is supplied at a set pressure and volume through a gas control unit. The gas flow rate is detected by a gas flow meter. Once the flow rate stabilizes, the data displayed by the gas flow meter is the leakage amount of the rotary valve under the set pressure and temperature conditions.

[0035] Compared with the prior art, the beneficial effects of the present invention are:

[0036] This invention utilizes annular steps of different outer diameters sequentially arranged on the end faces of the upper and lower pressure plates to correspond to the inlet and outlet diameters of different rotary valve models. This allows for the testing of leakage rates of different rotary valve models, providing a wide range of applications. Furthermore, the annular steps on the upper and lower pressure plates engage with the inlet and outlet of the rotary valve, respectively, and are pressed together by a hydraulic transmission assembly to prevent gas leakage during the test, thus ensuring the accuracy of the rotary valve leakage rate test results.

[0037] This invention can test the leakage of the same model of rotary valve under different pressures and temperatures; it can also test the leakage of different models of rotary valve. Attached Figure Description

[0038] Figure 1 This is a schematic diagram of the structure of a rotary valve leakage test device according to an embodiment of the present invention;

[0039] Figure 2 This is a schematic diagram of the upper pressure plate.

[0040] Figure 3 This is a schematic diagram of the lower pressure plate.

[0041] In the diagram, 1. Gas control unit, 2. Electric heat tracing device power supply, 3. Gas flow meter, 4. Test platform frame, 5. Frame reinforcing rib, 6. Hydraulic cylinder controller, 7. Hydraulic transmission assembly, 8. Connecting short pipe, 9. Upper pressure plate, 901. Upper pressure plate body, 902. First protrusion, 10. Electric heating assembly, 11. Temperature sensor, 12. Lower pressure plate, 1201. Lower pressure plate base, 1202. Lower pressure plate body, 1203. Groove, 1204. First bolt hole, 1205. Second protrusion, 1206. First through hole, 1207. Second through hole, 13. Trolley guide rail, 14. Trolley, 15. Long screw, 16. Rotary valve, 17. Delivery pipeline, 18. Drain port. Detailed Implementation

[0042] The present invention will now be described in further detail with reference to the accompanying drawings:

[0043]

Example 1

[0044] like Figure 1 As shown, this embodiment of the invention provides a rotary valve leakage test device, including a test platform frame 4, which includes a top plate and a bottom plate.

[0045] A hydraulic transmission assembly 7 is installed on the top plate, and the lower end of the hydraulic transmission assembly 7 is connected to an upper pressure plate 9 through a connecting short pipe 8.

[0046] A trolley 14 is slidably mounted on the base plate, and a lower pressure plate 12 is mounted on the trolley 14. The upper pressure plate 9 and the lower pressure plate 12 are used to fix the rotary valve 16.

[0047] The lower pressure plate 12 is provided with a through hole, which is connected to the gas control unit 1 through the delivery pipeline 17. A gas flow meter 3 is provided on the output pipeline 17.

[0048] During testing, the operator first fixes the lower pressure plate 12 onto the trolley 14, then connects the outlet of the rotary valve 16 to the lower pressure plate 12 and slides the trolley 14 to the corresponding position on the bottom plate of the test platform frame 4. The upper pressure plate 9 is then connected to the inlet of the rotary valve 16, and the upper pressure plate 9 is connected to the hydraulic transmission assembly 7 via the connecting short pipe 8. The hydraulic transmission assembly 7 is used to press the upper pressure plate 9, the rotary valve 16, and the lower pressure plate 12 together to prevent air leakage. The operator operates the gas control unit 1 to provide gas at the set pressure and volume, and the gas flow meter 3 detects the gas flow data. Once the flow rate stabilizes, the data displayed by the gas flow meter 3 is the amount of air leakage of the rotary valve 16 under the set pressure and temperature conditions.

[0049] In this invention, the gas control unit 1 is a product with existing technology structure. It can be a pressure tank or other equipment or device that can provide a gas source and regulate the gas flow and pressure, which will not be described in detail here.

[0050]

Example 2

[0051] The test platform frame 4 includes four vertically arranged columns, with a top plate at the top of each column and a bottom plate at the bottom. Frame reinforcing ribs 5 are provided at the connection points between the top plate and the four columns, and at the connection points between the bottom plate and the four columns, to improve the stability and robustness of the platform frame 4.

[0052] The base plate is provided with two parallel trolley guide rails 13. The trolley 14 is slidably connected to the trolley guide rails 13 to realize the movement of the trolley on the base plate of the test platform frame 4, thereby driving the lower pressure plate 12 and the rotary valve 16 to move on the base plate. Preferably, the trolley guide rails 13 are welded to the base plate.

[0053]

Example 3

[0054] like Figure 2 As shown, the upper pressure plate 9 includes an upper pressure plate body 901. The lower end face of the upper pressure plate body 901 is provided with a first protrusion 902 extending downward. The first protrusion 902 is provided with a plurality of first annular steps. The outer diameter of the plurality of first annular steps decreases from top to bottom. The outer surface of each first annular step is provided with threads, so that the first annular step can extend into the rotary valve inlet and engage with the rotary valve inlet.

[0055] By providing multiple first annular steps on the first protrusion 902, with the outer diameter of the multiple first annular steps decreasing sequentially from top to bottom, different types of rotary valves can be accommodated, facilitating the engagement of the inlet of different types of rotary valves with the upper pressure plate 9 and improving testing efficiency. Preferably, a gasket is provided at the engagement point between the first annular step and the rotary valve inlet to further prevent gas leakage.

[0056]

Example 4

[0057] like Figure 3 As shown, the lower pressure plate 12 includes a lower pressure plate base 1201 and a lower pressure plate body 1202. The upper surface of the lower pressure plate base 1201 is provided with a groove 1203, and the lower pressure plate body 1202 is disposed in the groove 1203. The lower pressure plate base 1201 is provided with a plurality of first bolt holes 1204 for fixed connection with the trolley 14, so that the trolley 14 can drive the lower pressure plate 12 to move together to the designated position during the sliding process.

[0058] The upper end face of the pressure plate body 1202 is provided with an upwardly extending second protrusion 1205. The second protrusion 1205 is provided with a plurality of second annular steps. The outer diameter of the plurality of second annular steps decreases from bottom to top. The outer surface of each second annular step is provided with threads, so that the second annular step can extend into the rotary valve outlet and engage with the rotary valve outlet.

[0059] By providing multiple second annular steps on the second protrusion 1205, with the outer diameter of the multiple second annular steps decreasing sequentially from bottom to top, different types of rotary valves can be accommodated, facilitating the engagement of the outlets of different types of rotary valves with the lower pressure plate 12 and improving testing efficiency. Preferably, a gasket is provided at the engagement point between the second annular step and the rotary valve outlet to further prevent gas leakage.

[0060] A first through hole 1206 is provided at the center of the pressure plate body 1202. The first through hole 1206 extends from the lower end face of the pressure plate body 1202 to the top of the second protrusion 1205. A second through hole 1207 is provided at the center of the pressure plate base 1201. The first through hole 1206 and the second through hole 1207 are connected to form the through hole. Preferably, the first through hole 1206 and the second through hole 1207 are arranged on the same axis. Gas is introduced through the gas control unit 1. The gas passes through the delivery pipeline 17, the second through hole 1207, and the first through hole 1206 in sequence and enters the rotary valve 16.

[0061] Because there is a gap between the rotor and the housing of the rotary valve 16, during pneumatic conveying, gas passing through the conveying pipeline 17 to the rotary valve 16 will flow from the outlet direction to the inlet direction due to the gap and the rotor rotation during operation. This gas flow rate is the leakage of the rotary valve. This invention addresses this by sequentially setting annular steps of different outer diameters on the end faces of the upper pressure plate 9 and the lower pressure plate 12, respectively, to correspond to the inlet and outlet diameters of different models of the rotary valve 16. Furthermore, the annular steps on the upper pressure plate 9 and the lower pressure plate 12 engage with the inlet and outlet of the rotary valve to prevent gas leakage during testing, thus ensuring the accuracy of the leakage test results for the rotary valve 16.

[0062]

Example 5

[0063] The trolley 15 includes a trolley top plate, and two support legs are provided on the lower end surface of the trolley top plate. Each of the two support legs is provided with a slider, and the two sliders are slidably connected to the two trolley guide rails 13 respectively.

[0064] The lower end face of the trolley top plate is also provided with at least one support plate. The support plate is located between the two support legs and is perpendicular to the trolley guide rail 13. The support plate is provided with bolt holes, and the positions of the bolt holes on each support plate are corresponding. Preferably, the bolt holes are located in the middle position of the support plate. The long bolt 15 passes through the bolt hole. By rotating the long bolt 15, the trolley 14 can slide on the trolley guide rail 13 to the designated position.

[0065] A central through hole is provided on the top plate of the trolley. The position of the central through hole is adapted to the position of the second through hole 1207 on the lower pressure plate base 1201. The central through hole is connected to the delivery line 17 through a hose. Specifically, one end of the hose is inserted into the central through hole and fixed, and the other end is connected to the delivery line 17, so that the gas introduced by the gas control unit 1 enters the rotary valve 16 through the delivery line 17, the central through hole and the through hole provided on the lower pressure plate in sequence.

[0066] The trolley top plate is also provided with multiple second bolt holes. The position and number of the second bolt holes correspond to the position and number of the first bolt holes 1204 provided on the lower pressure plate base 1201, so that the lower pressure plate base can be fixed to the trolley top plate by bolts. Then, by rotating the long bolt 15, the trolley 14 can slide on the trolley guide rail 13, thereby driving the lower pressure plate 12 and the rotary valve 16 to slide to the designated position.

[0067]

Example 6

[0068] The rotary valve leakage test device also includes a hydraulic cylinder controller 6, which is welded to the test platform frame 4. The hydraulic cylinder controller 6 is connected to the hydraulic transmission assembly 7 via a metal pipe.

[0069] Since different models of rotary valves 16 have different volumes and sizes, the pressure required for clamping during the corresponding test process is different. By operating the hydraulic cylinder controller 6, the hydraulic transmission component 7 is moved downward through hydraulic pressure to clamp the upper pressure plate 9, rotary valve 16 and lower pressure plate 12, so as to prevent gas from leaking from the meshing point between the upper pressure plate 9, the lower pressure plate 12 and the inlet and outlet of the rotary valve 6 and the inlet of the rotary valve. The gas can only be released from the leakage port of the rotary valve 16 through the vent port 18, which effectively ensures the authenticity and accuracy of the test results.

[0070] Corresponding to different models of rotary valves, there are corresponding sizes of connecting short pipes 8. The size of the connecting short pipes 8 must ensure that both ends of the connecting short pipes 8 are in natural contact with the upper end face of the upper pressure plate 9 and the contact surface of the hydraulic transmission component 7.

[0071] In this invention, both the hydraulic cylinder controller 6 and the hydraulic transmission component 7 are existing technology products. For example, the hydraulic transmission component 7 can be a hydraulic cylinder, which will not be described in detail here.

[0072]

Example 7

[0073] Because the housing and rotor of the rotary valve 16 are made of different metals with different coefficients of thermal expansion, the gap between the housing and rotor of the same rotary valve 16 varies at different temperatures, resulting in different leakage rates. To test the leakage rate of the rotary valve at different temperatures, the rotary valve leakage rate testing device of this invention further includes an electric heating assembly 10. The electric heating assembly 10 is disposed outside the rotary valve 16, enclosing the rotary valve 16, and is used to test the leakage rate of the rotary valve at different temperatures.

[0074] The electric heating component 10 has an openable structure, such as an electric heating jacket. The electric heating jacket is connected to the power supply 2 to make the test temperature reach the set temperature.

[0075] It also includes a temperature sensor 11, which is installed on the rotary valve 16 or the electric heating assembly 10 to monitor and control the test temperature in real time, so as to test the leakage of the rotary valve at different temperatures.

[0076]

Example 8

[0077] This invention also provides a method for testing the leakage of a rotary valve, which uses the rotary valve leakage testing device described in the above embodiments to test the leakage of the rotary valve, specifically:

[0078] The operator places the lower pressure plate base on the trolley 14 and secures it with bolts. Then, the lower pressure plate body is placed in the groove of the lower pressure plate base. The outlet of the rotary valve 16 is engaged with the annular step of the corresponding size on the lower pressure plate body. The trolley 14 is slid to the corresponding position of the test platform frame 4 by rotating the long screw 15. The annular step of the upper pressure plate 9 of the corresponding size is engaged with the inlet of the rotary valve. The upper pressure plate 9 is connected to the hydraulic transmission assembly 7 through the connecting short pipe 8. The operator operates the hydraulic cylinder controller 6 to press the upper pressure plate 9, the rotary valve 16 and the lower pressure plate 12 with a specified pressure through the hydraulic transmission assembly 7.

[0079] The rotary valve 16 is wrapped with an electric heating component 10, and the temperature is detected by the temperature sensor 11 until the set temperature is reached. The operator operates the gas control unit 1 to provide gas at the set pressure and volume. The gas flow meter 3 detects the gas flow data. After the flow stabilizes, the data displayed by the gas flow meter 3 is the amount of gas leakage of the rotary valve 16 under the set pressure and temperature conditions.

[0080] After the current test process is completed, the operator can set the pressure of the gas control unit 1 or change the test temperature through the electric heating component, so as to realize the leakage test of the same rotary valve under different pressures and temperatures.

[0081] Since the present invention provides annular steps with different outer diameters on the end faces of the upper pressure plate 9 and the lower pressure plate 12 respectively, corresponding to the inlet and outlet diameters of different models of rotary valves 16, it can realize the leakage test of different models of rotary valves, with a wide range of applicability and ensure the accuracy of the test results.

[0082] This invention solves the problem of the lack of an accurate testing method for the leakage of rotary valves, thereby ensuring the authenticity and reliability of the leakage data of rotary valves under different operating conditions. It provides a measurement scheme for optimizing the manufacturing process and selecting industrial applications of rotary valves, and provides reference data for the selection of upstream and downstream equipment related to pneumatic conveying systems. It is of great significance to the stability and energy saving of pneumatic conveying systems.

[0083] The rotary valve leakage test system of this invention has been used to test the leakage of rotary valves in PP and PE pneumatic conveying systems of Zhenhai Refining & Chemical, Wuhan Petrochemical and other companies. It has collected leakage data of different models of rotary valves under different operating conditions, providing technical support for equipment selection and process optimization in pneumatic conveying.

[0084] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "connected" and "linked" 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. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0085] In the description of this invention, unless otherwise stated, the terms "upper," "lower," "left," "right," "inner," "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this 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. Therefore, they should not be construed as limitations on this invention.

[0086] The above technical solution is only one embodiment of the present invention. For those skilled in the art, based on the principles disclosed in the present invention, it is easy to make various types of improvements or modifications, and not limited to the technical solutions described in the specific embodiments of the present invention. Therefore, the foregoing description is only a preferred option and is not restrictive.

Claims

1. A rotary valve leakage test device, characterized in that, The test platform includes a test platform framework, which comprises a top plate and a bottom plate. The top plate is equipped with a hydraulic transmission assembly, and the lower end of the hydraulic transmission assembly is connected to an upper pressure plate through a connecting short pipe. A trolley is slidably mounted on the base plate, and a lower pressure plate is mounted on the trolley. The upper pressure plate and the lower pressure plate are used to fix a rotary valve. The pressure plate is provided with a through hole, which is connected to the gas control unit through a delivery pipeline, and a gas flow meter is provided on the output pipeline.

2. The rotary valve leakage test device according to claim 1, characterized in that, The upper pressure plate includes an upper pressure plate body. The lower end face of the upper pressure plate body is provided with a first protrusion extending downward. The first protrusion is provided with a plurality of first annular steps. The outer diameter of the plurality of first annular steps decreases from top to bottom. The outer surface of each first annular step is provided with threads for engagement with the rotary valve inlet.

3. The rotary valve leakage test device according to claim 1, characterized in that, The lower pressure plate includes a lower pressure plate base and a lower pressure plate body. The upper surface of the lower pressure plate base is provided with a groove, and the lower pressure plate body is disposed in the groove. The lower pressure plate base is provided with a plurality of first bolt holes for fixed connection with the trolley.

4. The rotary valve leakage test device according to claim 3, characterized in that, The upper end face of the pressure plate body is provided with an upwardly extending second protrusion. The second protrusion is provided with a plurality of second annular steps. The outer diameter of the plurality of second annular steps decreases from bottom to top. The outer surface of each second annular step is provided with threads.

5. The rotary valve leakage test device according to claim 4, characterized in that, A first through hole is provided at the center of the lower pressure plate body; A second through hole is provided at the center of the lower pressure plate base; The first through hole and the second through hole are connected to form the through hole.

6. The rotary valve leakage test device according to claim 5, characterized in that, The trolley includes a trolley top plate, and two support legs are provided on the lower end face of the trolley top plate. Each of the two support legs is provided with a slider, and the two sliders are slidably connected to the two trolley guide rails respectively. The lower end face of the trolley top plate is also provided with at least one support plate. The support plate is located between the two support legs and is perpendicular to the trolley guide rail. The support plate is provided with bolt holes, and the positions of the bolt holes on each support plate are corresponding.

7. The rotary valve leakage test device according to claim 6, characterized in that, A central through hole is provided on the top plate of the trolley, and the position of the central through hole is adapted to the position of the second through hole on the lower pressure plate base. The central through hole is connected to the conveying pipeline through a flexible hose. The trolley top plate is also provided with a plurality of second bolt holes, the position and number of which correspond to the position and number of first bolt holes provided on the lower pressure plate base.

8. The rotary valve leakage test device according to claim 1, characterized in that, The rotary valve leakage test device also includes an electric heating component, which is located on the outside of the rotary valve and encloses it.

9. The rotary valve leakage test device according to claim 1, characterized in that, The rotary valve leakage test device also includes a temperature sensor, which is installed on the rotary valve or the electric heating assembly.

10. A method for testing the leakage of a rotary valve, characterized in that, The leakage of a rotary valve is tested using the rotary valve leakage test device as described in any one of claims 1-9, wherein the test method is as follows: First, fix the lower pressure plate on the trolley. Then, after engaging the outlet of the rotary valve with the lower pressure plate, slide the trolley to the corresponding position, engage the upper pressure plate with the inlet of the rotary valve, and then connect the upper pressure plate to the hydraulic transmission assembly through the connecting short pipe. By controlling the hydraulic transmission assembly, press the upper pressure plate, rotary valve and lower pressure plate together to prevent air leakage. The rotary valve is heated by an electric heating element to reach the set test temperature. Gas is supplied at a set pressure and volume through a gas control unit. The gas flow rate is detected by a gas flow meter. Once the flow rate stabilizes, the data displayed by the gas flow meter is the leakage amount of the rotary valve under the set pressure and temperature conditions.

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