A valve seal leak detection apparatus and method

Abstract

The application provides a valve sealing leakage detection device and method, which comprises a rack and a top rack arranged on the rack, a plurality of sets of inflation mechanisms and positioning mechanisms are symmetrically arranged below the two side beams of the top rack; the positioning mechanism comprises a gas cylinder b arranged below the beam and a clamp arranged at the output end of the gas cylinder b, and a docking assembly and a detection assembly are arranged on the clamp; the inflation mechanism comprises a gas cylinder a and a conical adapter plug arranged at the output end of the gas cylinder a. The application realizes flexible bulging limiting and self-adaptive sealing of the valve flange end through the linkage structure of the air bag, the rib web and the elastic cover, realizes automatic sound and light alarm of the leakage state through the linkage cooperation of the gas pressure piston, the conductive part and the electric contact part in the detection assembly, solves the problems of unreliable positioning and clamping of the existing detection device, easy damage to the valve, poor sealing effect, inability to adapt to different specifications of the valve and lack of automatic leakage judgment and alarm function, and is suitable for online detection of the valve automatic production assembly line.

Description

Technical Field

[0001] This invention relates to the field of valve testing technology, and in particular to a valve sealing leakage detection device and method. Background Technology

[0002] Valves, as crucial components for controlling the flow and regulation of fluid media, are widely used in various industrial pipeline systems such as water conservancy, chemical engineering, and energy. The quality of a valve's sealing performance directly affects the operational safety of the entire system and the reliability of media delivery. Therefore, accurate and efficient testing of its sealing performance is essential during valve manufacturing and factory inspection.

[0003] Chinese patent CN209878215U discloses a valve airtightness testing platform. This platform includes a base, a support frame, and a valve pressure plate. The support frame is mounted on the base, and a track connects the support frame and the base. A valve bracket is mounted on the track. A jack is mounted on a crossbeam on the support frame, and the valve pressure plate is positioned at the top of the jack corresponding to the base. Its advantages include: a simple structure, the ability to test the airtightness of various valve models, and more convenient airtightness testing.

[0004] However, this technical solution uses a jack to drive a pressure plate for rigid clamping and positioning, which lacks flexible buffering and anti-deviation constraints, making it easy to damage the valve and resulting in poor sealing reliability. The valve loading, unloading, and clamping operations all rely on manual labor, making it impossible to connect to an assembly line for continuous online inspection. It has poor adaptability to valves of different diameters, requiring manual tooling changes when changing specifications. In addition, this solution lacks real-time pressure monitoring and automatic leakage detection functions, and the detection results rely on manual observation, making it difficult to meet the requirements of automated production lines for detection efficiency, accuracy, and traceability. Summary of the Invention

[0005] The purpose of this invention is to address the shortcomings of existing technologies by providing a valve sealing leakage detection device and method. The device achieves automatic valve clamping, positioning, and sealing through the coordinated operation of an inflation mechanism and a positioning mechanism. A flexible bulge limiting and adaptive sealing of the valve flange end is achieved through the linkage structure of an airbag, a reinforcing mesh, and an elastic cover. Automatic audible and visual alarms for leakage are triggered through the linkage of a pneumatic piston, conductive components, and contact components in the detection assembly. This invention solves the problems of unreliable positioning and clamping in existing detection devices, easy damage to valves, poor sealing effect, inability to adapt to different valve specifications, high reliance on manual intervention, and lack of automatic leakage detection and alarm functions.

[0006] To achieve the above objectives, the present invention provides the following technical solution: A valve sealing leakage detection device and method includes a frame and a top frame mounted on the frame. Multiple sets of inflation mechanisms and positioning mechanisms are respectively installed under the crossbeams on both sides of the top frame. The multiple sets of inflation mechanisms and positioning mechanisms are arranged symmetrically facing each other under the crossbeams on both sides of the top frame. The top beam of the top frame is also provided with a total air passage corresponding to the number of multiple sets of inflation mechanisms and positioning mechanisms. The positioning mechanism includes a cylinder b installed under the top frame beam. The output end of the cylinder b is provided with an output block. A clamp is fixedly connected to the output block. The clamp is an upper and lower combined structure. Locking bolts are bolted to the locking edges on both sides of the clamp. A connecting arm extends from the locking edges of the clamp. The positioning mechanism also includes a docking component and a detection component installed on the clamp.

[0007] The inflation mechanism includes a cylinder a installed under the top frame beam, and a conical adapter plug is installed at the output end of the cylinder a. An air inlet pipe is connected through the outer wall of the conical adapter plug.

[0008] The docking assembly includes: an airbag mounted on the clamp; a retaining ring located at the rear half of the airbag, which engages with the clamp to secure the airbag; a contraction section located at the front half of the airbag; a limiting ring located at the opening of the contraction section, used to further seal the connection between the elastic cover and the contraction section; an elastic cover sealed to the opening of the contraction section; a reinforcing mesh located on the inner arc surface of the elastic cover; a detection connector extending through the rear end of the airbag; and an air replenishment connector extending through the rear end of the airbag.

[0009] The detection assembly includes: a detection tube connected to the detection connector; a barometer connected to the detection tube; a piston cylinder located at the tail end of the detection tube; a pneumatic piston sliding within the piston cylinder; a spring rod mounted on one side of the pneumatic piston; an electromagnet mounted on the pneumatic piston; a slide rail fixedly connected to the outer wall of the piston cylinder; a slider a sliding on the slide rail; a permanent magnet mounted on the slider a; a conductive element mounted on the slider a and electrically connected to a power source; a slider b sliding on the slide rail; a positioning bolt threaded onto the slider b; and an electric contact mounted on the slider b and electrically connected to an audible and visual alarm.

[0010] The frame is also equipped with a conveyor belt and a power distribution box, and valve components are transported on the conveyor belt.

[0011] The beneficial effects of this invention are as follows: (1) This invention achieves fully automated continuous operation of valves from feeding, positioning, clamping, inflation testing to completion of testing by symmetrically arranging the inflation mechanism and positioning mechanism under the crossbeams on both sides of the top frame, in conjunction with the continuous automatic feeding of the conveyor belt. No manual intervention is required for valve loading and unloading operations and manual clamping drive. Multiple sets of inflation and positioning mechanisms can test multiple valves simultaneously, which greatly improves the testing efficiency of the production line, effectively reduces labor costs and operational intensity, and meets the needs of modern automated valve production lines for high-efficiency testing.

[0012] (2) This invention utilizes a linkage structure of an airbag, a reinforcing mesh, and an elastic cover. The airbag is driven by cylinder b to press the elastic cover against the valve flange end face. The airbag's contraction section retracts due to clamping pressure, reducing the internal volume and increasing the air pressure. The high-pressure gas causes the elastic cover to undergo elastic deformation outwards, forming bulges at each mesh position under the constraint of the reinforcing mesh. These bulges, under pressure, embed into the threaded connection holes of the flange face and the valve outlet hole, thus forming a multi-point mesh-like interlocking and limiting mechanism on the flange face, achieving the following multiple effects: First, flexible contact replaces rigid clamping, avoiding indentation or deformation damage to the valve surface caused by traditional rigid clamping. Second, the bulge embedded in the threaded hole forms a horizontal anti-displacement constraint, effectively preventing the valve from shifting due to increased internal air pressure during testing. Third, the flexible deformation of the elastic cover can adapt to the shape and size of flange end faces of different specifications, allowing for quick switching to test valves of different diameters without changing any tooling, making it highly versatile. Fourth, the bulge's tight fit with the flange hole wall forms multiple sealing barriers, significantly improving the sealing reliability of the valve outlet end.

[0013] (3) This invention utilizes the linkage between the pneumatic piston, conductive parts, and contact parts in the detection assembly. A small amount of gas in the air bladder enters the piston cylinder through the detection tube, pushing the pneumatic piston backward. The pneumatic piston, through the magnetic attraction of the electromagnet and the permanent magnet, drives the slider a to move backward synchronously, thus disconnecting the conductive parts and contact parts. When the valve leaks, the air pressure inside the valve drops, causing the air pressure inside the air bladder and piston cylinder to decrease synchronously. The pneumatic piston moves forward and resets under the action of the spring rod's rebound force, and through magnetic attraction, drives the slider a to move back, causing the conductive parts and contact parts to re-contact, thereby automatically activating the audible and visual alarm circuit and triggering the alarm. At the same time, the barometer records the pressure change curve throughout the process as a data traceability basis. This mechanism can achieve automatic judgment and immediate alarm of the leakage state without manual observation of bubbles or reading of instrument values. The detection results are objective and reliable, and different alarm trigger thresholds can be flexibly set by adjusting the position of slider b to meet the detection accuracy requirements of different valve products. Attached Figure Description

[0014] Figure 1This is a schematic diagram of the overall structure of the present invention; Figure 2 This is a top view of the structure of the present invention; Figure 3 This is a partial structural diagram of the present invention; Figure 4 This is a schematic diagram of the inflation mechanism of the present invention; Figure 5 This is a schematic diagram of the positioning mechanism structure of the present invention; Figure 6 This is a schematic diagram of the overall structure of the docking component of the present invention; Figure 7 This is a schematic diagram of the disassembled structure of the docking component of the present invention; Figure 8 This is a schematic cross-sectional view of the docking component of the present invention; Figure 9 This is a schematic diagram of the back structure of the elastic cover of the present invention; Figure 10 This is a schematic diagram of the cross-sectional structure of the piston cylinder of the present invention.

[0015] The reference numerals in the accompanying drawings of this application are as follows: 1. Frame; 101. Conveyor belt; 102. Distribution box; 103. Top frame; 2. Valve component; 3. Inflation mechanism; 301. Cylinder a; 302. Conical adapter plug; 303. Inlet pipe; 4. Positioning mechanism; 401. Cylinder b; 402. Output block; 403. Clamp; 4031. Locking bolt; 4032. Connecting arm; 41. Docking assembly; 411. Airbag; 412. Snap ring; 413. Retracting section; 414. 415. Limiting ring; 416. Elastic cover; 417. Rib mesh; 418. Detection connector; 419. Air supply connector; 420. Detection assembly; 421. Detection tube; 422. Barometer; 423. Piston cylinder; 424. Pneumatic piston; 425. Spring rod; 426. Electromagnet; 427. Slide rail; 428. Slider a; 4281. Permanent magnet; 4282. Conductive component; 429. Slider b; 4291. Positioning bolt; 4292. Contact component; 5. Main air circuit. Detailed Implementation

[0016] 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.

[0017] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," and "counterclockwise," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are 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.

[0018] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this invention, "a plurality of" means two or more, unless otherwise explicitly specified.

[0019] Example: Figures 1-10 As shown, this embodiment provides a valve sealing leakage detection device and method, including a frame 1 and a top frame 103 mounted on the frame 1. Multiple sets of inflation mechanisms 3 and positioning mechanisms 4 are respectively installed under the crossbeams on both sides of the top frame 103. The multiple sets of inflation mechanisms 3 and positioning mechanisms 4 are arranged symmetrically facing each other under the crossbeams on both sides of the top frame 103. A total air passage 5 corresponding to the number of multiple sets of inflation mechanisms 3 and positioning mechanisms 4 is also provided on the top beam of the top frame 103. The positioning mechanism 4 includes a cylinder b401 installed under the crossbeam of the top frame 103. The output end of the cylinder b401 is provided with an output block 402. A clamp 403 is fixedly connected to the output block 402. The clamp 403 is an upper and lower combined structure. Locking bolts 4031 are bolted to the locking edges on both sides of the clamp 403. A connecting arm 4032 extends from the locking edge of the clamp 403. The positioning mechanism 4 also includes a docking component 41 and a detection component 42 installed on the clamp 403.

[0020] The inflation mechanism 3 includes a cylinder a301 installed under the crossbeam of the top frame 103. A conical adapter plug 302 is installed at the output end of the cylinder a301. An air inlet pipe 303 is connected through the outer wall of the conical adapter plug 302.

[0021] In this embodiment, the conical adapter plug 302 is driven by cylinder a301 to contact the inlet hole of valve component 2, and the docking assembly 41 is driven by cylinder b401 to contact the outlet end of valve component 2. Thus, the valve component 2 is positioned by clamping from both sides, and is prepared for subsequent testing. The contact end of the conical adapter plug 302 is conical, which makes it easy to enter the inlet hole of valve component 2 and can be adapted to valves of different diameters.

[0022] The docking assembly 41 includes: an airbag 411, which is mounted on a clamp 403; a retaining ring 412, which is located in the rear half of the airbag 411 and engages with the clamp 403 to secure the airbag 411; a contraction section 413, which is located in the front half of the airbag 411; a limiting ring 414, which is located at the opening of the contraction section 413 and is used to further seal the connection between the elastic cover 415 and the contraction section 413; an elastic cover 415, which is sealed to the opening of the contraction section 413; a reinforcing mesh 416, which is located on the inner arc surface of the elastic cover 415; a detection connector 417, which is connected through to the rear end of the airbag 411; and an air replenishment connector 418, which is connected through to the rear end of the airbag 411.

[0023] In this embodiment, the output drive of cylinder b401 causes the elastic cover 415 on the airbag 411 to contact the flange face at the outlet end of the valve component 2, reducing the wear of the valve component 2 due to excessive clamping and positioning pressure. After clamping and applying pressure, the outer convex surface of the elastic cover 415 will be flattened, and the contraction section 413 of the airbag 411 will contract backward. However, the compression space is limited. As the volume of the airbag 411 decreases, the air pressure increases. The high pressure causes the elastic cover 415 to undergo elastic deformation outward. After the deformation is constrained by the rib mesh 416, it will bulge within the mesh of the rib mesh 416. The outer side of the elastic cover 415 is pressed and contacted with the flange face, so the mesh in the threaded connection hole of the flange face and the mesh in the outlet hole of the valve component 2 will deform and bulge. These bulges limit the position and prevent the valve component 2 from shifting during the detection process. At the same time, the sealing effect of the outlet hole of the valve component 2 is improved, ensuring the accuracy of the detection.

[0024] The detection assembly 42 includes: a detection tube 421, which is connected to the detection connector 417; a barometer 422, which is connected to the detection tube 421; a piston cylinder 423, which is located at the tail end of the detection tube 421; a pneumatic piston 424, which slides inside the piston cylinder 423; a spring rod 425, which is installed on one side of the pneumatic piston 424; an electromagnet 426, which is located on the pneumatic piston 424; and a slide rail 427, which is fixedly connected to the outer wall of the piston cylinder 423. Slider a428 slides on slide rail 427; permanent magnet 4281 is mounted on slider a428; conductive element 4282 is located on slider a428 and is electrically connected to a power source; slider b429 slides on slide rail 427; positioning bolt 4291 is threaded onto slider b429; electric contact 4292 is located on slider b429 and is electrically connected to an audible and visual alarm.

[0025] In this embodiment, when the airbag 411 is positioned and contracted, a small amount of gas inside the airbag 411 enters the piston cylinder 423 through the detection connector 417 and the detection tube 421. The barometer 422 monitors the internal air pressure in real time, causing the air pressure inside the piston cylinder 423 to increase. The air pressure piston 424 moves backward against the rebound force of the spring rod 425. The air pressure piston 424 drives the slider a428 to move backward through the magnetic attraction between the electromagnet 426 and the permanent magnet 4281, further moving the slider a428 away from the slider b429. The slider b429 is locked and positioned in an appropriate position by the positioning bolt 4291, so that the conductive part 4282 on the slider a428 is disconnected from the contact part 4292 on the slider b429, thereby preparing for detection.

[0026] The frame 1 is also equipped with a conveyor belt 101 and a power distribution box 102, and the valve component 2 is conveyed on the conveyor belt 101.

[0027] Work steps Step 1, Loading process: Place valve parts 2 horizontally on the conveyor belt 101 in sequence, and the conveyor belt 101 will transport the valve parts 2 to the inspection station below the inspection top frame 103 in sequence; Step 2, Preliminary Positioning Process: The conical adapter plug 302 is driven by cylinder a301 to contact the inlet hole of valve component 2, and the docking assembly 41 is driven by cylinder b401 to contact the outlet end of valve component 2. Thus, the valve components 2 passing through in sequence are positioned by clamping from both sides, and preparation is made for subsequent testing. Step 3, Flexible Positioning Process: Driven by the output of cylinder b401, the elastic cover 415 on the airbag 411 contacts the flange face at the outlet end of the valve component 2, reducing the wear of the valve component 2 due to excessive clamping and positioning pressure. After clamping and applying pressure, the outer convex surface of the elastic cover 415 will be flattened, and the contraction section 413 of the airbag 411 will contract backward. However, the compression space is limited. As the volume of the airbag 411 decreases, the air pressure increases. The high pressure causes the elastic cover 415 to undergo elastic deformation outward. After the deformation is constrained by the rib mesh 416, it will bulge within the mesh of the rib mesh 416. The outer side of the elastic cover 415 is pressed and contacted with the flange face, so the mesh in the threaded connection hole of the flange face and the mesh in the outlet hole of the valve component 2 will deform and bulge. These bulges limit the position and prevent the valve component 2 from shifting during the detection process. At the same time, it improves the sealing effect of the outlet hole of the valve component 2 and ensures the accuracy of the detection. Step 4, Detection Preparation: When the airbag 411 is positioned and contracted, a small amount of gas inside the airbag 411 enters the piston cylinder 423 through the detection connector 417 and the detection tube 421. The barometer 422 monitors the internal air pressure in real time, causing the air pressure inside the piston cylinder 423 to increase. The air pressure piston 424 moves backward against the rebound force of the spring rod 425. The air pressure piston 424, through the magnetic attraction between the electromagnet 426 and the permanent magnet 4281, will drive the slider a428 to move backward, further distancing slider a428 from slider b429. Slider b429 is locked and positioned in an appropriate position by the positioning bolt 4291, disconnecting the conductive part 4282 on slider a428 from the contact part 4292 on slider b429, thus preparing for detection. Step 5, Inspection Process: A fixed amount of compressed air is slowly injected into the valve component 2 through the air inlet port of the valve component 2 via the air inlet pipe 303. The air pressure inside the valve component 2 gradually increases, thereby gradually squeezing the bulge generated at the outlet port of the valve component 2 by the elastic cover 415 during clamping and positioning. The bulge will gradually flatten and sink, thereby further increasing the air pressure inside the air bladder 411 and piston cylinder 423, ensuring that the conductive part 4282 on the slider a428 and the contact part 4292 on the slider b429 are disconnected. The pressure curve is recorded in real time by the barometer 422. After the fixed amount of compressed air is completely injected into the valve component 2, and the pressure fluctuation curve of the barometer 422 is always within the standard range for a certain period of time, it can be concluded that the valve component 2 meets the standard and does not leak. When valve component 2 leaks, the compressed air inside valve component 2 will escape, causing the air pressure inside valve component 2 to gradually decrease. The bulge created by the elastic cover 415 at the outlet hole of valve component 2 will gradually rebound and return to the bulging state. Furthermore, the air pressure inside the air bladder 411 and piston cylinder 423 will gradually decrease, and the pressure curve monitored and recorded by the barometer 422 will drop. At the same time, the spring rod 425 will push the air pressure piston 424 to reset due to its rebound force. Simultaneously, the magnetic force will drive the slider a428 to move back, causing the conductive part 4282 on slider a428 to contact the contact part 4292 on slider b429. This will activate the circuit of the audible and visual alarm, alerting the staff that a leak has occurred in the corresponding valve component 2, and facilitating troubleshooting and removal.

[0028] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A valve seal leakage detection device, comprising a frame (1), characterized in that, It also includes a top frame (103) mounted on the frame (1). Multiple sets of inflation mechanisms (3) and positioning mechanisms (4) are installed under the crossbeams on both sides of the top frame (103). The multiple sets of inflation mechanisms (3) and positioning mechanisms (4) are arranged symmetrically facing each other under the crossbeams on both sides of the top frame (103). The top beam of the top frame (103) is also provided with a total air passage (5) corresponding to the number of multiple sets of inflation mechanisms (3) and positioning mechanisms (4). The positioning mechanism (4) includes a cylinder b (401) installed under the crossbeam of the top frame (103). The output end of the cylinder b (401) is provided with an output block (402), and a clamp (403) is fixedly connected to the output block (402). The positioning mechanism (4) also includes a docking component (41) and a detection component (42) installed on the clamp (403).

2. The valve sealing leakage detection device according to claim 1, characterized in that, The inflation mechanism (3) includes a cylinder a (301) installed under the crossbeam of the top frame (103). A conical adapter plug (302) is installed at the output end of the cylinder a (301). An air inlet pipe (303) is connected through the outer wall of the conical adapter plug (302).

3. The valve sealing leakage detection device according to claim 1, characterized in that, The clamp (403) is an upper and lower combined structure. Locking bolts (4031) are bolted to the locking edges on both sides of the clamp (403). Connecting arms (4032) also extend from the locking edges of the clamp (403).

4. The valve sealing leakage detection device according to claim 3, characterized in that, The docking assembly (41) includes: an airbag (411) mounted on the clamp (403); a contraction section (413) located in the front half of the airbag (411); an elastic cover (415) sealed to the opening of the contraction section (413); a reinforcing mesh (416) located on the inner arc surface of the elastic cover (415); a detection connector (417) connected through to the rear end of the airbag (411); and an air replenishment connector (418) connected through to the rear end of the airbag (411).

5. A valve sealing leakage detection device according to claim 4, characterized in that, The rear half of the airbag (411) is provided with a retaining ring (412), which is engaged with the clamp (403) to lock and install the airbag (411).

6. The valve sealing leakage detection device according to claim 4, characterized in that, A limiting ring (414) is provided at the opening of the contraction section (413), and the limiting ring (414) is used to further seal the connection between the elastic cover (415) and the contraction section (413).

7. The valve sealing leakage detection device according to claim 4, characterized in that, The detection component (42) includes: a detection tube (421) which is connected to the detection connector (417); and a barometer (422) which is connected to the detection tube (421).

8. A valve sealing leakage detection device according to claim 7, characterized in that, The detection assembly (42) further includes: a piston cylinder (423), which is located at the tail end of the detection tube (421); a pneumatic piston (424), which slides inside the piston cylinder (423); a spring rod (425), which is installed on one side of the pneumatic piston (424); an electromagnet (426), which is located on the pneumatic piston (424); a slide rail (427), which is fixedly connected to the outer wall of the piston cylinder (423); and a slider a (428). The slider a (428) slides on the slide rail (427); the permanent magnet (4281) is mounted on the slider a (428); the conductive element (4282) is disposed on the slider a (428); the slider b (429) slides on the slide rail (427); the positioning bolt (4291) is threaded on the slider b (429); the electric contact element (4292) is disposed on the slider b (429).

9. A valve sealing leakage detection device according to claim 8, characterized in that, The conductive element (4282) is electrically connected to the power supply, and the contact element (4292) is electrically connected to the audible and visual alarm.

10. A detection method for a valve seal leakage detection device according to any one of claims 1-9, characterized in that, Includes the following steps: Step 1, Loading process: Place the valve component (2) horizontally on the conveyor belt (101) and transport it to the inspection station; Step 2, Preliminary positioning process: Cylinder a (301) drives the conical adapter plug (302) to contact the inlet hole of the valve component (2), and cylinder b (401) drives the docking assembly (41) to contact the outlet end of the valve component (2) to achieve double-sided clamping and positioning; Step 3, Flexible Positioning Process: Cylinder b (401) drives airbag (411) to press elastic cover (415) against the flange surface. The air pressure inside airbag (411) increases, causing elastic cover (415) to form a bulge in the mesh of reinforcing rib (416) and embed into the flange hole, thereby achieving limiting and sealing. Step 4, Test preparation process: The gas in the airbag (411) enters the piston cylinder (423) and pushes the pneumatic piston (424) to move backward. Through magnetic adsorption, the slider a (428) moves backward, so that the conductive part (4282) is disconnected from the contact part (4292), and the test preparation is completed. Step 5, Inspection process: A certain amount of compressed air is injected into the valve component (2) through the air inlet pipe (303). The pressure curve is monitored in real time by the barometer (422). If the pressure curve is within the standard range within the specified time, the valve is sealed and qualified. If the valve leaks, the air pressure piston (424) resets and drives the conductive component (4282) to contact the electric contact component (4292), triggering an audible and visual alarm.

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