A bidirectional pressure-adjustable stop valve sealing detection device

Abstract

This invention discloses a bidirectional pressure-adjustable shut-off valve sealing performance testing device, relating to the field of valve sealing performance testing technology. The sealing performance testing device includes a base, on which a hydraulic clamping frame, an auxiliary positioning component, and a testing unit are mounted, and the base contains a chamber. An installation hole is provided on the base, and a plug is installed in the installation hole and at the actuating end of the hydraulic clamping frame. A connecting part is installed on the plug. A water supply tank and a water replenishment tank are installed on one side of the hydraulic clamping frame, and the water supply tank and water replenishment tank are connected to the connecting part via pipelines. A pressure transmitter is installed on the connecting part, and a liquid flow meter is installed on the water replenishment tank. A displacement sensor is installed on the auxiliary positioning component. After the shut-off valve is positioned by the auxiliary positioning component, the hydraulic clamping frame drives the plug to descend and press against the valve body. The displacement sensor detects the resulting deformation. Pressure is applied to either end of the valve body, and once the pressure reaches the target, it is maintained. The pressure inside the valve body is kept constant by the water replenishment tank, and the pressure is recorded by the liquid flow meter.

Description

Technical Field

[0001] This invention relates to the field of valve sealing performance testing technology, specifically a bidirectional pressure adjustable gate valve sealing performance testing device. Background Technology

[0002] Gate valves, also known as stop valves, are a type of forced-seal valve. Therefore, when the valve is closed, pressure must be applied to the valve disc to force a leak-proof seal. They are generally used to control the flow of various types of fluids, such as air, water, steam, various corrosive media, mud, oil, liquid metals, and radioactive media. Existing gate valves undergo quality inspection before being manufactured and sold, among which the sealing test is particularly important and is the focus of the entire gate valve quality inspection.

[0003] Traditional gate valve testing equipment requires manual alignment during gate valve installation, resulting in low accuracy. It also lacks the functions of valve body deformation detection and bidirectional pressure application, leading to interference in deformation detection. Furthermore, it cannot simulate valve cover sealing issues and valve opening smoothness issues under bidirectional pressure and flow conditions. Summary of the Invention

[0004] The purpose of this invention is to provide a two-way pressure adjustable shut-off valve sealing performance testing device to solve the problems raised in the prior art.

[0005] To achieve the above objectives, the present invention provides the following technical solution: the sealing test device includes a base, a hydraulic clamping frame is provided on the base, and a cavity is provided inside the base. An auxiliary positioning component is provided on the hydraulic clamping frame along the circumferential direction, and a test unit is provided on the base on one side of the auxiliary positioning component. The detection unit includes a plug, connector, water supply tank, water replenishment tank, pipeline, pressure transmitter, liquid flow meter and displacement sensor; The base has mounting holes, and plugs are installed in the mounting holes and at the actuator end of the hydraulic clamping frame. Connecting parts are installed on the plugs. A water supply tank and a water replenishment tank are installed on one side of the hydraulic clamping frame. The water supply tank and water replenishment tank are connected to the connecting parts via pipelines. A pressure transmitter is installed on the connecting parts. A liquid flow meter is installed at the output end of the water replenishment tank. A displacement sensor is installed at the positioning clamping end of the auxiliary positioning component. When testing the liquid sealing performance of the shut-off valve, the shut-off valve is placed on the plugs of the base. At this time, the shut-off valve is centered and positioned by the auxiliary positioning component, so that the centers of the two plugs and the valve body flange are on the same axis. Then, it is pressed and fixed. At this time, the displacement sensor is located between the upper and lower flanges of the valve body. Then, the hydraulic clamping frame moves the plugs... The valve body is compressed by the downward movement of the valve head, and the deformation caused by the compression is detected by the displacement sensor. At this time, the shut-off valve is closed, and the high-pressure water pump in the water supply tank injects water into either end of the valve body through the pipeline. After the pressure transmitter detects that the pressure in the valve body reaches the standard, the water injection stops and the pressure is maintained through the pipeline. If the pressure drops during the pressure maintenance period, the pressure transmitter controls the water supply tank to inject water into the valve body through the pipeline to maintain the pressure in the valve body. The water injected through the water supply tank is recorded by the liquid flow meter, so the leakage rate per unit time can be directly obtained. Moreover, bidirectional pressure testing can be performed without disassembling the valve body. At the same time, the displacement sensor collects the pressure on both sides and the deformation displacement of the valve body and valve seat, thereby eliminating the pressure drop caused by deformation.

[0006] As a preferred technical solution, the detection unit also includes an air compressor, a makeup air tank, a dryer filter, and a gas flow meter; An air compressor and a replenishing air tank are installed on the base away from the water supply tank. The air compressor and the replenishing air tank are connected to the connection part through pipelines. A dryer filter is installed at the output end of the air compressor, and a gas flow meter is installed at the output end of the replenishing air tank. When the gas sealing performance of the shut-off valve is tested, the air compressor and the replenishing air tank can be controlled to pressurize and maintain the pressure in the valve body through the pipelines. The specific operation is the same as that of liquid sealing test, and will not be described in detail.

[0007] As a preferred technical solution, the pipeline includes a forward pressure application pipe, a reverse pressure application pipe, and a pressure-replenishing branch pipe; The water supply tank and air compressor are connected to their respective connectors via forward and reverse pressure pipes, respectively. The water replenishment tank and air replenishment tank are connected to their respective forward and reverse pressure pipes via pressure replenishment branch pipes, respectively. One-way valves and regulating valves are installed at the output ends of the forward, reverse, and pressure replenishment branch pipes. During sealing performance testing, gas or liquid is pressurized into the valve body via independent forward or reverse pressure pipes, and each forward and reverse pressure pipe is equipped with a pressure replenishment branch pipe. When maintaining pressure, the regulating valve on the forward or reverse pressure pipe is closed. When the pressure decreases, the input of the pressure replenishment branch pipe is controlled by the regulating valve, thereby individually regulating the pressure and completing the forward and reverse sealing performance tests in one operation.

[0008] As a preferred technical solution, the auxiliary positioning component includes a positioning unit, an auxiliary clamping unit, and a driving unit; The positioning unit includes a slide, an electric push rod, an arc-shaped push plate, a slide groove, a support rod, and ball bearings; Multiple upper slideways are formed along the circumference of the mounting holes on the top of the base. A drive unit is installed at the top of the chamber. A slide block is slidably mounted on the actuating end of the drive unit. Electric push rods are symmetrically mounted on the slide block. An arc-shaped push plate is mounted on the actuating end of the electric push rod. A gap is left between the bottom of the arc-shaped push plate and the plug on the base. Support rods are symmetrically mounted on the bottom of the slide block. A groove is formed on the surface of the base directly below the support rod. Ball bearings are rolled on the bottom of the support rod and are stuck in the groove. When the shut-off valve is placed on the plug of the base, the drive unit drives the slide block to slide closer to the plug. The extension distance of the arc-shaped push plate is adjusted by the electric push rod to adapt to flanges of different diameters. Multiple arc-shaped push plates move closer simultaneously to push the valve body towards the center of the plug to achieve positioning and centering, improve the centering degree, and reduce or avoid forces other than axial force when the hydraulic clamping frame drives the plug to descend and press the valve body.

[0009] As a preferred technical solution, the auxiliary clamping unit includes a sliding sleeve, an automatic telescopic rod, a pressure head, an elastic contact pad, and a hydraulic rod. Multiple hydraulic rods are mounted on the base. The actuator end of the hydraulic rod is connected to the drive unit. A sliding sleeve is mounted on the top of the actuator end of the drive unit. An automatic telescopic rod is mounted on the end of the sliding sleeve away from the mounting hole. A pressure head is slidably mounted inside the sliding sleeve. The pressure head is fastened to the automatic telescopic rod, and an elastic contact pad is mounted on the end of the pressure head near the mounting hole. After alignment, the hydraulic rod drives the drive unit to descend, thereby causing the pressure head to descend and press against the flange of the valve body. The elastic contact pad can prevent damage to the paint on the flange surface during pressing. The contact area between the pressure head and the flange surface can be adjusted by the automatic telescopic rod, thereby clamping the valve body more stably and preventing the valve body from shifting during axial pressing.

[0010] As a preferred technical solution, the drive unit includes an annular shell, a lower slide rail, a drive ring, an arc-shaped groove, a lever, a through slot, and a drive motor; The hydraulic rod actuator penetrates the top of the base and is fitted with an annular shell. Multiple lower sliding tracks, each corresponding to an upper sliding track, are formed on the annular shell. A through groove is formed on one side of the annular shell. A drive ring is rotatably mounted inside the annular shell. Multiple arc-shaped grooves are formed on the drive ring, and a meshing groove is formed on the side wall of the drive ring. A lever is slidably mounted within the arc-shaped grooves, passing through the upper and lower sliding tracks. A drive motor is mounted at the bottom of the annular shell, and a gear is mounted on the output shaft of the drive motor. The gear passes through the through grooves and meshes with the meshing grooves. When the shut-off valve is placed on the plug of the base, the drive motor drives the drive ring to rotate. The arc-shaped grooves, following the rotation of the drive ring, cause the lever to slide towards the center, thus achieving a centering drive function.

[0011] As a preferred technical solution, a filter plate is installed on the side of the chamber near the water supply tank. The filter plate divides the chamber into a drainage chamber and a clean water chamber. The bottom of the connection part of the plug in the mounting hole passes through the mounting hole and is equipped with a solenoid valve. The input end of the water supply tank is connected to the clean water chamber through a pipe. After the liquid tightness test is completed, the liquid in the valve body is released into the drainage chamber by controlling the solenoid valve to open, and then the corresponding pipeline is closed. The regulating valve on the positive pressure pipe connected to the plug on the air compressor and the hydraulic clamp is opened to dry the valve body, which is convenient for subsequent factory shipment or air tightness testing.

[0012] As a preferred technical solution, an adjustable support is slidably mounted on the base, and a rotary motor is mounted on the adjustable support. A turntable is mounted on the output shaft of the rotary motor, and at least two chucks are evenly installed on the turntable along the circumference. When pressure is applied to the valve in one direction or in both directions simultaneously, the actual working condition of the valve is simulated by adjusting the pressure inside the cavity. At this time, it is possible to observe whether there is leakage at the valve gland. After a certain period of time, the adjustable support is controlled to drive the rotary motor to approach the valve handwheel, and rotates it after being locked by the chucks. The force required for the valve to open under load can be detected by adding a force sensor or torque sensor to determine whether the valve opening is smooth against the pipe wall.

[0013] Compared with the prior art, the beneficial effects of the present invention are: 1. This application uses an auxiliary positioning component to center and initially tighten the shut-off valve, ensuring that the centers of the two plugs and the valve body flange are on the same axis. Then, the hydraulic clamping frame drives the plugs to descend and tighten the valve body, and the deformation generated is detected by a displacement sensor. At this time, the shut-off valve is closed, and the water supply tank pressurizes either end of the valve body through the pipeline. After the pressure transmitter detects that the pressure in the valve body reaches the standard, water injection stops, and pressure is maintained through the pipeline. If the pressure drops during the pressure maintenance period, the pressure transmitter controls the water supply tank to inject water into the valve body through the pipeline to maintain a constant pressure in the valve body. The water injected through the water supply tank is recorded by a liquid flow meter, thereby obtaining the leakage rate per unit time, which directly reflects the sealing performance.

[0014] 2. This application uses a drive unit to move the slide block closer to the plug. The extension distance of the arc-shaped push plate is adjusted by an electric push rod to accommodate flanges of different diameters. Multiple arc-shaped push plates move closer simultaneously to push the valve body towards the center of the plug to achieve positioning and centering, thus improving the centering accuracy. Then, the hydraulic rod drives the drive unit to descend, thereby causing the pressure head to descend and press the flange of the valve body. The elastic contact pad can prevent damage to the paint on the flange surface during pressing, thus clamping the valve body more stably and preventing displacement of the valve body during axial pressing.

[0015] 3. When pressure is applied in one direction or in both directions simultaneously, this application simulates the actual working condition of the valve by adjusting the pressure inside the cavity. At this time, the adjustable support drives the rotary motor to approach the valve handwheel and rotates it after being locked by the pawl. The force required for the valve to open under load can be detected by adding a force sensor or torque sensor to determine whether the valve opening is smooth against the pipe wall. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the overall first-view structure of the present invention; Figure 2 This is a schematic diagram of the overall second-view structure of the present invention; Figure 3 This is a schematic diagram of the first cross-sectional structure of the present invention; Figure 4 This is a schematic diagram of the second cross-sectional structure of the present invention; Figure 5 This is a schematic diagram of the auxiliary positioning component structure of the present invention; Figure 6 This is a partial cross-sectional view of the auxiliary positioning component of the present invention; Figure 7 for Figure 4 Enlarged structural diagram at point A in the diagram; Figure 8 for Figure 4 A magnified structural diagram at point B in the diagram.

[0017] In the diagram: 1. Base; 11. Mounting hole; 12. Upper slide rail; 13. Drainage chamber; 14. Clean water chamber; 2. Detection unit; 21. Plug; 22. Connection part; 23. Water supply tank; 24. Water replenishment tank; 26. Pressure transmitter; 27. Liquid flow meter; 28. Displacement sensor; 29. ​​Air compressor; 210. Air replenishment tank; 211. Dryer filter; 212. Gas flow meter; 25. Piping; 251. Forward pressure application pipe; 252. Reverse pressure application pipe; 253. Pressure replenishment branch pipe; 3. Auxiliary positioning components; 31. Positioning unit; 311. Slide; 312. Electric push rod; 313. Arc-shaped push plate; 314. Slide groove; 315. Support rod; 316. Ball bearing; 32. Auxiliary clamping unit; 321. Slide sleeve; 322. Automatic telescopic rod; 323. Pressure head; 324. Elastic contact pad; 33. Drive unit; 331. Hydraulic rod; 332. Annular shell; 333. Lower slide rail; 334. Drive ring; 335. Arc-shaped groove; 336. Toggle lever; 337. Through groove; 338. Drive motor; 4. Hydraulic clamping frame; 5. Adjustable distance support; 51. Rotary motor; 52. Turntable; 53. Claws; 6. Filter plate; 7. Solenoid valve. Detailed Implementation

[0018] 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.

[0019] Example: Figures 1-4 As shown, the present invention provides a technical solution for a two-way pressure adjustable shut-off valve sealing performance testing device. The sealing performance testing device includes a base 1, a hydraulic clamping frame 4 is provided on the base 1, and a chamber is provided inside the base 1. An auxiliary positioning component 3 is provided on the hydraulic clamping frame 4 along the circumferential direction, and a testing unit 2 is provided on the base 1 on one side of the auxiliary positioning component 3. The detection unit 2 includes a plug 21, a connector 22, a water supply tank 23, a water replenishment tank 24, a pipeline 25, a pressure transmitter 26, a liquid flow meter 27, and a displacement sensor 28; A mounting hole 11 is provided on the base 1. A plug 21 is installed in the mounting hole 11 and at the actuating end of the hydraulic clamping frame 4. A connecting part 22 is installed on the plug 21. A water supply tank 23 and a water replenishment tank 24 are installed on one side of the hydraulic clamping frame 4. The water supply tank 23 and the water replenishment tank 24 are connected to the connecting part 22 through a pipeline 25. A pressure transmitter 26 is installed on the connecting part 22. A liquid flow meter 27 is installed at the output end of the water replenishment tank 24. A displacement sensor 28 is installed at the positioning clamping end of the auxiliary positioning component 3. When the liquid sealing performance of the shut-off valve is tested, the shut-off valve is placed on the plug 21 of the base 1. At this time, the shut-off valve is centered and positioned by the auxiliary positioning component 3 so that the centers of the two plugs 21 and the valve body flange are on the same axis. Then, it is pressed and fixed. At this time, the displacement sensor 28 is located between the upper and lower flanges of the valve body. Then, the hydraulic clamping frame 4 drives the plug 21 to descend and press the valve body. The displacement sensor 28 detects the deformation of the valve body when it is pressed up and down. At this time, the shut-off valve is closed, and the high-pressure water pump in the water supply tank 23 injects water into either end of the valve body through the pipeline 25. After the pressure transmitter 26 detects that the pressure in the valve body reaches the standard, the water injection stops and the pressure is maintained through the pipeline 25. If the pressure drops during the pressure maintenance period, the pressure transmitter 26 controls the water supply tank 24 to inject water into the valve body through the pipeline 25 to keep the pressure in the valve body constant. The water injected through the water supply tank 24 is recorded by the liquid flow meter 27, so the leakage rate per unit time can be directly obtained. Moreover, bidirectional pressure testing can be performed without disassembling the valve body. At the same time, the displacement sensor 28 collects the pressure on both sides and the deformation displacement of the valve body and valve seat, thereby eliminating the pressure drop caused by deformation.

[0020] The detection unit 2 also includes an air compressor 29, an air replenishment tank 210, a dryer filter 211, and a gas flow meter 212; An air compressor 29 and an air supply tank 210 are installed on the base 1 on the side away from the water supply tank 23. The air compressor 29 and the air supply tank 210 are connected to the connection part 22 through the pipeline 25. A dryer filter 211 is installed at the output end of the air compressor 29, and a gas flow meter 212 is installed at the output end of the air supply tank 210. When the gas sealing performance of the shut-off valve is tested, the air compressor 29 and the air supply tank 210 can be controlled to pressurize and maintain the pressure in the valve body through the pipeline 25. The specific operation is the same as that of liquid sealing test, and will not be described in detail.

[0021] Pipeline 25 includes a forward pressure application pipe 251, a reverse pressure application pipe 252, and a pressure replenishment branch pipe 253; Water supply tank 23 and air compressor 29 are connected to corresponding connection parts 22 via forward pressure pipe 251 and reverse pressure pipe 252, respectively. Water replenishment tank 24 and air replenishment tank 210 are connected to corresponding forward pressure pipe 251 and reverse pressure pipe 252 via pressure replenishment branch pipe 253, respectively. One-way valves and regulating valves are installed at the output ends of forward pressure pipe 251, reverse pressure pipe 252 and pressure replenishment branch pipe 253. When performing sealing performance testing, gas or liquid pressurizes the valve body through independent forward pressure pipe 251 or reverse pressure pipe 252, and each forward pressure pipe 251 and reverse pressure pipe 252 is equipped with a pressure replenishment branch pipe 253. When maintaining pressure, the regulating valve on the forward pressure pipe 251 or reverse pressure pipe 252 is closed. When the pressure decreases, the input of the pressure replenishment branch pipe 253 is controlled by the regulating valve, thereby individually regulating the pressure and completing the forward and reverse sealing performance testing in one step.

[0022] like Figures 5-8 As shown, the auxiliary positioning component 3 includes a positioning unit 31, an auxiliary clamping unit 32, and a driving unit 33; The positioning unit 31 includes a slide block 311, an electric push rod 312, an arc-shaped push plate 313, a slide groove 314, a support rod 315, and a ball bearing 316. Multiple upper slideways 12 are provided on the top of the base 1 along the circumferential direction of the mounting holes 11. A drive unit 33 is provided on the top of the cavity. A slide block 311 is slidably mounted on the actuating end of the drive unit 33. Electric push rods 312 are symmetrically mounted on the slide block 311. An arc-shaped push plate 313 is mounted on the actuating end of the electric push rod 312. A gap is left between the bottom of the arc-shaped push plate 313 and the plug 21 on the base 1. Support rods 315 are symmetrically mounted on the bottom of the slide block 311. A groove 314 is provided on the surface of the base 1 directly below the support rod 315. The bottom of the support rod 315 rolls. The valve is equipped with ball bearings 316, which are locked in the slide groove 314. When the shut-off valve is placed on the plug 21 of the base 1, the drive unit 33 drives the slide block 311 to slide closer to the plug 21. The electric push rod 312 adjusts the extension distance of the arc-shaped push plate 313 to adapt to flanges of different diameters. Multiple arc-shaped push plates 313 move closer to each other to center the valve body towards the center of the plug 21, thereby improving the centering degree and reducing or avoiding forces other than axial force generated when the hydraulic clamping frame 4 drives the plug 21 to descend and press the valve body.

[0023] The auxiliary clamping unit 32 includes a sliding sleeve 321, an automatic telescopic rod 322, a pressure head 323, an elastic contact pad 324, and a hydraulic rod 331; Multiple hydraulic rods 331 are installed on the base 1. The actuating end of the hydraulic rods 331 is connected to the drive unit 33. A sliding sleeve 321 is installed on the top of the actuating end of the drive unit 33. An automatic telescopic rod 322 is installed on the end of the sliding sleeve 321 away from the mounting hole 11. A pressure head 323 is slidably installed inside the sliding sleeve 321. The pressure head 323 is fastened to the automatic telescopic rod 322. An elastic contact pad 324 is installed on the end of the pressure head 323 near the mounting hole 11. After alignment, the hydraulic rods 331 drive the drive unit 33 to descend, thereby causing the pressure head 323 to descend and press against the flange of the valve body. The elastic contact pad 324 can prevent damage to the paint on the flange surface during pressing. The contact area between the pressure head 323 and the flange surface can be adjusted by the automatic telescopic rod 322, thereby clamping the valve body more stably and preventing the valve body from shifting during axial pressing.

[0024] The drive unit 33 includes an annular shell 332, a lower slide rail 333, a drive ring 334, an arc groove 335, a lever 336, a through groove 337, and a drive motor 338; The hydraulic rod 331 has its actuator end penetrating the top of the base 1 and is fitted with an annular shell 332. The annular shell 332 has multiple lower sliding tracks 333 that correspond one-to-one with the upper sliding track 12. A through groove 337 is provided on one side of the annular shell 332. A drive ring 334 is rotatably installed inside the annular shell 332. The drive ring 334 has multiple arc-shaped grooves 335 and a meshing groove is provided on the side wall of the drive ring 334. A lever 336 is slidably installed in the arc-shaped groove 335. The lever 336 passes through the upper sliding track 12 and the lower sliding track 333. A drive motor 338 is installed at the bottom of the annular shell 332. A gear is installed on the output shaft of the drive motor 338. The gear passes through the through groove 337 and meshes with the meshing groove. When the shut-off valve is placed on the plug 21 of the base 1, the drive motor 338 drives the drive ring 334 to rotate. The arc-shaped groove 335 rotates with the drive ring 334, causing the lever 336 to slide towards the center, thereby playing a centering driving role.

[0025] A filter plate 6 is installed on the side of the chamber near the water supply tank 23. The filter plate 6 divides the chamber into a drain chamber 13 and a clean water chamber 14. The bottom of the connecting part 22 on the plug 21 in the mounting hole 11 passes through the mounting hole 11 and is equipped with a solenoid valve 7. The input end of the water supply tank 23 is connected to the clean water chamber 14 through a pipe. After the liquid sealing test is completed, the liquid in the valve body is released into the drain chamber 13 by controlling the solenoid valve 7 to open, and then the corresponding pipeline 25 is closed. The regulating valve on the positive pressure pipe 251 connected to the plug 21 on the air compressor 29 and the hydraulic clamp 4 is opened to dry the valve body, which is convenient for subsequent factory shipment or airtightness testing.

[0026] like Figure 4 and Figure 8 As shown, an adjustable support 5 is slidably mounted on the base 1, and a rotary motor 51 is mounted on the adjustable support 5. A turntable 52 is mounted on the output shaft of the rotary motor 51. At least two claws 53 are evenly mounted on the turntable 52 along the circumferential direction. When pressure is applied in one direction or in both directions at the same time, the actual working condition of the valve is simulated by adjusting the pressure in the cavity. At this time, the adjustable support 5 drives the rotary motor 51 to approach the valve handwheel and rotates after being locked by the claws 53. The force required for the valve to open under load can be detected by adding a force sensor or torque sensor to determine whether the valve opening is smooth against the pipe wall.

[0027] Working principle of the invention: When testing the liquid sealing performance of the gate valve, the gate valve is placed on the plug 21 of the base 1. At this time, the drive motor 338 drives the drive ring 334 to rotate. The arc groove 335 rotates with the drive ring 334, causing the lever 336 to slide towards the center. The extension distance of the arc push plate 313 is adjusted by the electric push rod 312. Multiple arc push plates 313 move closer to each other at the same time, pushing the valve body towards the center of the plug 21 to achieve positioning and centering. Then, the hydraulic rod 331 drives the drive unit 33 to descend, thereby causing the pressure head 323 to descend and press the flange of the valve body. The elastic contact pad 324 can avoid damaging the paint on the flange surface during pressing. The contact area between the pressure head 323 and the flange surface can be adjusted by the automatic telescopic rod 322. At this time, the centers of the two plugs 21 and the valve body flange are on the same axis. The displacement sensor 28 is located between the upper and lower flanges of the valve body. Then, the hydraulic clamping frame 4 drives the plug 21 to descend and press the valve body. The displacement sensor 28 detects the deformation generated when the valve body is pressed up and down.

[0028] After clamping is completed, the shut-off valve is closed. The high-pressure water pump in the water supply tank 23 injects water into either end of the valve body through the pipeline 25. After the pressure transmitter 26 detects that the pressure in the valve body meets the standard, the water injection stops and the pressure is maintained through the pipeline 25. If the pressure drops during the pressure maintenance period, the pressure transmitter 26 controls the water supply tank 24 to inject water into the valve body through the pipeline 25 to maintain the pressure in the valve body. The water injected through the water supply tank 24 is recorded by the liquid flow meter 27. After the liquid tightness test is completed, the liquid in the valve body is released into the drain chamber 13 by controlling the solenoid valve 7 to open, and then the corresponding pipeline 25 is closed. The regulating valve on the positive pressure pipe 251 connected to the plug 21 on the hydraulic clamping frame 4 of the air compressor 29 is opened to dry the valve body, which is convenient for the subsequent air tightness test. The air tightness test and liquid tightness test steps can be interchanged.

[0029] When pressure is applied to the valve body in one direction or in both directions simultaneously, the actual working condition of the valve is simulated by adjusting the pressure inside the cavity. At this time, the adjusting support 5 drives the rotary motor 51 to approach the valve handwheel and rotates after being locked by the pawl 53. The force required for the valve to open under load can be detected by adding a force sensor or torque sensor to determine whether the valve opening is smooth against the pipe wall.

[0030] It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above, and that the invention can be implemented in other specific forms without departing from its spirit or essential characteristics. Therefore, the embodiments should be considered in all respects as exemplary and non-limiting, and the scope of the invention is defined by the appended claims rather than the foregoing description. Thus, all variations falling within the meaning and scope of equivalents of the claims are intended to be included within the present invention. No reference numerals in the claims should be construed as limiting the scope of the claims.

Claims

1. A device for testing the sealing performance of a bidirectional pressure-adjustable shut-off valve, characterized in that: The sealing test device includes a base (1), a hydraulic clamping frame (4) is provided on the base (1), and a cavity is provided inside the base (1). An auxiliary positioning component (3) is provided along the circumferential direction on the hydraulic clamping frame (4), and a test unit (2) is provided on the base (1) on one side of the auxiliary positioning component (3). The detection unit (2) includes a plug (21), a connector (22), a water supply tank (23), a water replenishment tank (24), a pipeline (25), a pressure transmitter (26), a liquid flow meter (27), and a displacement sensor (28). The base (1) has an installation hole (11). A plug (21) is installed in the installation hole (11) and at the execution end of the hydraulic clamping frame (4). A connecting part (22) is installed on the plug (21). A water supply tank (23) and a water replenishment tank (24) are installed on one side of the hydraulic clamping frame (4). The water supply tank (23) and the water replenishment tank (24) are connected to the connecting part (22) through a pipeline (25). A pressure transmitter (26) is installed on the connecting part (22). A liquid flow meter (27) is installed at the output end of the water replenishment tank (24). A displacement sensor (28) is installed at the positioning clamping end of the auxiliary positioning component (3).

2. The bidirectional pressure adjustable shut-off valve sealing performance testing device according to claim 1, characterized in that: The detection unit (2) also includes an air compressor (29), an air replenishment tank (210), a dryer filter (211), and a gas flow meter (212). An air compressor (29) and an air replenishment tank (210) are installed on a base (1) on the side away from the water supply tank (23). The air compressor (29) and the air replenishment tank (210) are connected to the connection part (22) through a pipeline (25). A dryer filter (211) is installed at the output end of the air compressor (29), and a gas flow meter (212) is installed at the output end of the air replenishment tank (210).

3. The bidirectional pressure adjustable shut-off valve sealing performance testing device according to claim 2, characterized in that: The pipeline (25) includes a forward pressure application pipe (251), a reverse pressure application pipe (252), and a pressure replenishment branch pipe (253); The water supply tank (23) and the air compressor (29) are connected to the corresponding connecting parts (22) through the forward pressure pipe (251) and the reverse pressure pipe (252), respectively. The water replenishment tank (24) and the air replenishment tank (210) are connected to the corresponding forward pressure pipe (251) and the reverse pressure pipe (252) through the pressure replenishment branch pipe (253), respectively. The output ends of the forward pressure pipe (251), the reverse pressure pipe (252) and the pressure replenishment branch pipe (253) are all equipped with one-way valves and regulating valves.

4. The bidirectional pressure adjustable shut-off valve sealing performance testing device according to claim 1, characterized in that: The auxiliary positioning component (3) includes a positioning unit (31), an auxiliary clamping unit (32), and a driving unit (33). The positioning unit (31) includes a slide (311), an electric push rod (312), an arc-shaped push plate (313), a slide groove (314), a support rod (315), and a ball bearing (316). The base (1) has multiple upper slides (12) on its top along the circumferential direction of the mounting hole (11). A drive unit (33) is provided on the top of the cavity. A slide block (311) is slidably installed on the execution end of the drive unit (33). Electric push rods (312) are symmetrically installed on the slide block (311). An arc-shaped push plate (313) is installed on the execution end of the electric push rod (312). A gap is left between the bottom of the arc-shaped push plate (313) and the plug (21) on the base (1). Support rods (315) are symmetrically installed on the bottom of the slide block (311). A groove (314) is provided on the surface of the base (1) directly below the support rod (315). A ball bearing (316) is slidably installed on the bottom of the support rod (315). The ball bearing (316) is stuck in the groove (314).

5. The bidirectional pressure adjustable shut-off valve sealing performance testing device according to claim 4, characterized in that: The auxiliary clamping unit (32) includes a sliding sleeve (321), an automatic telescopic rod (322), a pressure head (323), an elastic contact pad (324), and a hydraulic rod (331). Multiple hydraulic rods (331) are installed on the base (1). The actuating end of the hydraulic rod (331) is connected to the drive unit (33). A sliding sleeve (321) is installed on the top of the actuating end of the drive unit (33). An automatic telescopic rod (322) is installed on the end of the sliding sleeve (321) away from the mounting hole (11). A pressure head (323) is slidably installed inside the sliding sleeve (321). The pressure head (323) is fastened to the automatic telescopic rod (322), and an elastic contact pad (324) is installed on the end of the pressure head (323) near the mounting hole (11).

6. The bidirectional pressure adjustable shut-off valve sealing performance testing device according to claim 5, characterized in that: The drive unit (33) includes an annular shell (332), a sliding track (333), a drive ring (334), an arc groove (335), a lever (336), a through groove (337), and a drive motor (338). The hydraulic rod (331) has its actuating end penetrating the top of the base (1) and is fitted with an annular shell (332). The annular shell (332) has multiple lower slides (333) that correspond one-to-one with the upper slide (12), and a through groove (337) is provided on one side of the annular shell (332). A drive ring (334) is rotatably installed inside the annular shell (332). The drive ring (334) has multiple arc-shaped grooves (335) and a meshing groove is provided on the side wall of the drive ring (334). A lever (336) is slidably installed inside the arc-shaped groove (335). The lever (336) passes through the upper slide (12) and the lower slide (333). A drive motor (338) is installed at the bottom of the annular shell (332). A gear is installed on the output shaft of the drive motor (338). The gear passes through the through groove (337) and meshes with the meshing groove.

7. The bidirectional pressure adjustable shut-off valve sealing performance testing device according to claim 1, characterized in that: A filter plate (6) is installed on the side of the chamber near the water supply tank (23). The filter plate (6) divides the chamber into a drainage chamber (13) and a clean water chamber (14). The bottom of the connecting part (22) on the plug (21) in the mounting hole (11) passes through the mounting hole (11) and is equipped with a solenoid valve (7). The input end of the water supply tank (23) is connected to the clean water chamber (14) through a pipe.

8. The bidirectional pressure adjustable shut-off valve sealing performance testing device according to claim 1, characterized in that: An adjustable support (5) is slidably mounted on the base (1). A rotary motor (51) is mounted on the adjustable support (5). A turntable (52) is mounted on the output shaft of the rotary motor (51). At least two claws (53) are evenly mounted on the turntable (52) along the circumferential direction.

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