Stop valve leakage detection experiment device

Abstract

The utility model relates to the technical field of valve detection, and particularly discloses a stop valve leakage detection experiment device which comprises a hydraulic pump and a base used for installing stop valves, and the base is provided with a plurality of valve seats matched with the stop valves of different sizes and used for being connected with the stop valves in a sealing mode. A plurality of liquid inlets correspondingly communicated with the bottoms of the valve seats are formed in the side face of the base, a liquid outlet of the hydraulic pump is connected with the liquid inlet corresponding to the valve seat provided with the stop valve through a pipeline, a pressure regulating valve and a pressure release valve are connected to the liquid outlet of the hydraulic pump, and a pressure gauge is connected to the end, close to the liquid inlet, of the pipeline. By adopting the stop valve leakage detection experiment device, a leakage detection experiment can be efficiently and quickly carried out on the stop valve, and leakage detection experiments can be carried out on various stop valves with different specifications.

Description

Technical Field

[0001] This utility model relates to the field of valve testing technology, and in particular to an experimental device for detecting leakage in a gate valve. Background Technology

[0002] A gate valve, also known as a stop valve, is a forced-seal valve. Therefore, when the valve is closed, pressure must be applied to the valve disc to force a leak-proof seal. The sealing performance of a gate valve directly affects the safety and stability of the entire system. Regular testing can help identify potential faults, prevent accidents, and ensure that the valve can perform its intended shut-off function at critical moments. Therefore, it is necessary to design a gate valve leakage detection experimental device to test the sealing performance of gate valves and improve the testing efficiency. Utility Model Content

[0003] To address the problem of low efficiency in the sealing test of gate valves in existing technologies, this invention provides a gate valve leakage detection experimental device.

[0004] The technical solution adopted in this utility model is:

[0005] A gate valve leakage detection experimental device includes a hydraulic pump and a base for mounting the gate valve. The base is provided with multiple valve seats adapted to gate valves of different sizes for sealing connection of the gate valve. The side of the base is provided with multiple liquid inlets that are respectively connected to the bottom of the valve seats. The outlet of the hydraulic pump is connected to the liquid inlet corresponding to the valve seat on which the gate valve is mounted. The outlet of the hydraulic pump is connected to a pressure regulating valve and a pressure relief valve. The inlet is connected to a pressure gauge.

[0006] Preferably, the pressure relief valve is an electromagnetic pressure relief valve, and the pressure gauge is an electrical contact pressure gauge.

[0007] Preferably, the top of the inner wall of the valve seat is provided with an internal thread for sealing connection with the shut-off valve.

[0008] Preferably, a sealing ring is provided on the inner wall of the valve seat below the internal thread. The inner side of the sealing ring is a frustum shape that is larger at the top and smaller at the bottom. The minimum inner diameter of the sealing ring is smaller than the inner diameter of the internal thread of the valve seat.

[0009] Preferably, the base has multiple return ports on the opposite side from the inlet, each corresponding to and communicating with the side of the valve seat.

[0010] Preferably, the gate valve leakage detection experimental device further includes an electrical control cabinet, which contains a power supply, a controller, and a time relay. The front of the electrical control cabinet is equipped with a start button, an emergency stop button, a manual / automatic switching knob, a pressure relief alarm, a manual pressure relief button, and a power indicator light. The signal input terminals of the controller are respectively connected to the start button, the emergency stop button, the manual / automatic switching knob, the manual pressure relief button, and the pressure gauge. The signal output terminals of the controller are respectively connected to the hydraulic pump, the time relay, the pressure relief valve, and the pressure relief alarm. The signal output terminal of the time relay is connected to the pressure relief valve. The power supply is respectively connected to the power indicator light, the controller, and the hydraulic pump.

[0011] The beneficial effects of this utility model are:

[0012] A dedicated base is provided for the sealing test of gate valves, facilitating the installation and fixation of gate valves. The base has various sizes of valve seats to connect gate valves of different sizes for sealing tests, such as DN10, DN25, and DN40. Different sizes of gate valves are installed in the corresponding valve seats. The outlet of the hydraulic pump is connected to the inlet of the corresponding valve seat through a pipeline. The pressure is adjusted to the required test pressure using a pressure regulating valve. Then, the hydraulic pump is started to output the medium to the set pressure and begin the pressure holding test. A pressure gauge can be used to check for leakage that causes a drop in pressure. If no leakage occurs, the pressure relief valve is opened to release pressure and end the test after the set test time is reached. This gate valve leakage detection test device can efficiently and quickly perform leakage detection tests on gate valves. Attached Figure Description

[0013] Figure 1 This is a schematic diagram of the hydraulic pump and base in an embodiment of the present invention;

[0014] Figure 2 This is a schematic diagram of the axial cross-section of one of the valve seats in one embodiment of this utility model;

[0015] Figure 3 This is a schematic diagram of the front of the electrical control cabinet in an embodiment of this utility model;

[0016] Figure 4 This is a schematic diagram of the connection relationship of the controller in an embodiment of this utility model;

[0017] Figure 5 This is a schematic diagram of the shut-off valve in an embodiment of the present invention;

[0018] Reference numerals: 1. Hydraulic pump; 2. Base; 3. Valve seat; 4. Inlet; 5. Pipeline; 6. Pressure regulating valve; 7. Pressure relief valve; 8. Pressure gauge; 9. Internal thread; 10. Sealing ring; 11. Return port; 12. Electrical control cabinet; 13. Power supply; 14. Controller; 15. Time relay; 16. Start button; 17. Emergency stop button; 18. Manual / automatic switch knob; 19. Pressure relief alarm; 20. Manual pressure relief button; 21. Power indicator light; 22. Valve body; 23. Valve head; 24. Nut; 25. Valve stem; 26. Valve core. Detailed Implementation

[0019] Example: Figure 1 and Figure 2 As shown, a gate valve leakage detection experimental device includes a hydraulic pump 1 and a base 2 for installing the gate valve. The base 2 is provided with multiple valve seats 3 adapted to gate valves of different sizes for sealing connection of the gate valve. The side of the base 2 is provided with multiple liquid inlets 4 respectively communicating with the bottom of the valve seats 3. The outlet of the hydraulic pump 1 is connected to the corresponding liquid inlet 4 of the valve seat 3 for installing the gate valve through a pipe 5. A pressure regulating valve 6 and a pressure relief valve 7 are connected to the outlet of the hydraulic pump 1. A pressure gauge 8 is connected to the end of the pipe 5 near the liquid inlet 4.

[0020] In this embodiment, the base 2 is equipped with multiple valve seats 3 of different sizes to accommodate different specifications of gate valves, such as the commonly seen DN10, DN25, and DN40 gate valves. Before the experiment, the gate valve is installed on the valve seat 3 of the appropriate size, the pipeline 5 is connected to the inlet 4 of the corresponding valve seat 3, the pressure is set by the pressure regulating valve 6, and then the hydraulic pump 1 is started to output the medium into the pipeline 5. The pressure gauge 8 has an upper and lower pressure threshold. When the pressure gauge 8 detects that the pressure has reached the upper threshold, the hydraulic pump 1 is stopped to conduct a pressure holding test. The pressure is generally MPa. If the gate valve has poor sealing and leakage occurs, the pressure detected by the pressure gauge 8 will gradually decrease. When it drops to the lower threshold, the sealing performance of the gate valve is unqualified. If no leakage occurs within the set test time, the pressure relief valve 7 is opened to release pressure after the set test time has elapsed. The structure of the gate valve can be as follows: Figure 5As shown, the valve includes a valve body 22, a valve stem 25, and a valve core 26. A valve head 23 is located on the inner side of the top of the valve body 22. A nut 24 is threaded onto the outer side of the top of the valve head 23. The bottom end of the valve stem 25 extends through the nut 24 and the valve head 23 to the inner side of the top of the valve body 22. The inner side of the top of the valve core 26 is threaded onto the outer side of the bottom end of the valve stem 25. The inner side of the bottom end of the valve body 22 extends inward to form a valve port. The outer diameter of the outer side of the bottom end of the valve core 26 gradually decreases from top to bottom, forming an oblique shape. When the valve core 26 descends, its inclined surface cooperates with the valve port to form a seal. The bottom side wall of the valve body 22 has a through hole for connecting the inside and outside of the valve body 22. After the shut-off valve is installed inside the valve seat 3, the bottom of the shut-off valve and the bottom of the valve seat 3 are in tight contact to form a seal. If the valve core 26 does not leak, the medium in the inlet 4 cannot enter the valve body 22 through the valve port. If the valve core 26 leaks, the medium in the inlet 4 will enter the valve body 22 through the valve port and flow out through the through hole on the valve body 22. The hydraulic pump 1 is generally an oil pump, and the medium is oil.

[0021] In one embodiment, the pressure relief valve 7 is an electromagnetic pressure relief valve 7, and the pressure gauge 8 is an electrical contact pressure gauge 8. The electromagnetic pressure relief valve 7 facilitates automatic control by cooperating with other components to open or close, and the electrical contact pressure gauge 8 facilitates automatic control by sending signals when an upper or lower threshold is reached.

[0022] In one embodiment, the top of the inner sidewall of the valve seat 3 is provided with an internal thread 9 for sealing connection with the gate valve. The bottom of the gate valve generally has an external thread that connects and is fixed to the internal thread 9 in the valve seat 3, thereby achieving a seal and facilitating quick installation of the gate valve into the valve seat 3.

[0023] To further enhance the sealing between the gate valve and the valve seat 3 and avoid interfering with the accuracy of experimental results, in one embodiment, a sealing ring 10 is provided on the inner wall of the valve seat 3 below the internal thread 9. The inner side of the sealing ring 10 is a frustum shape, wider at the top and narrower at the bottom, and the minimum inner diameter of the sealing ring 10 is smaller than the inner diameter at the internal thread 9 of the valve seat 3. During the process of rotating the gate valve within the valve seat 3 to achieve threaded connection, the gate valve moves downward along the valve seat 3, and the bottom of the gate valve contacts and presses against the sealing ring 10 to achieve a seal. Through the sealing cooperation with the threaded connection, multiple seals are achieved, ensuring that the seal between the valve seat 3 and the gate valve is sufficiently reliable and preventing poor sealing between the valve seat 3 and the gate valve from interfering with the accuracy of the gate valve's own leakage detection.

[0024] In one embodiment, the base 2, on the side opposite to the inlet 4, is provided with multiple return ports 11, each corresponding to and connected to the side of the valve seat 3. When a leakage detection test is performed on the shut-off valve, the return port 11 corresponding to the valve seat 3 on which the shut-off valve is installed is connected to a return pipe. If leakage occurs, the leaked medium can be discharged through the return port 11, preventing the medium from splashing due to excessive pressure. When the corresponding valve seat 3 is not being tested, a plug can be used to seal the return port 11 for protection.

[0025] like Figure 3 and Figure 4 As shown, in one embodiment, the shut-off valve leakage detection experimental device further includes an electrical control cabinet 12. The electrical control cabinet 12 is equipped with a power supply 13, a controller 14, and a time relay 15. The front of the electrical control cabinet 12 is equipped with a start button 16, an emergency stop button 17, a manual / automatic switching knob 18, a pressure relief alarm 19, a manual pressure relief button 20, and a power supply indicator light 13. The signal input terminals of the controller 14 are respectively connected to the start button 16, the emergency stop button 17, the manual / automatic switching knob 18, the manual pressure relief button 20, and the pressure gauge 8. The signal output terminals of the controller 14 are respectively connected to the hydraulic pump 1, the time relay 15, the pressure relief valve 7, and the pressure relief alarm 19. The signal output terminal of the time relay 15 is connected to the pressure relief valve 7. The power supply 13 is respectively connected to the power supply indicator light 13, the controller 14, and the hydraulic pump 1.

[0026] To facilitate automated control, an electrical control cabinet 12 is added in this embodiment. The power supply 13 inside the electrical control cabinet 12 is generally a power adapter and needs to be connected to an external power source. When the external power supply is connected, the power indicator light 13 lights up, indicating that the power supply is connected and the experiment can be carried out. During the experiment, after pressing the start button 16, the controller 14 controls the hydraulic pump 1 to output medium pressure. When the set upper pressure threshold is reached, the controller 14 stops the hydraulic pump 1 and starts the pressure holding experiment. If the shut-off valve leaks and the pressure drops to the set lower pressure threshold, the controller 14 activates the pressure relief alarm 19. If no leakage occurs, the pressure is held until the test time set by the time relay 15, and then the pressure relief valve 7 is opened for automatic pressure relief. The manual / automatic switch knob 18 is used to switch between manual and automatic control. When switched to manual control, manual operation can be performed. For example, if the pressure relief button is pressed manually, the controller 14 directly controls the pressure relief valve 7 to open for pressure relief.

[0027] The embodiments described above merely illustrate specific implementations of this utility model, and while the descriptions are detailed, they should not be construed as limiting the scope of this utility model patent. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this utility model, and these modifications and improvements all fall within the protection scope of this utility model.

Claims

1. A test apparatus for detecting leakage in a shut-off valve, comprising a hydraulic pump and a base for mounting the shut-off valve, characterized in that, The base is provided with multiple valve seats that are adapted to stop valves of different sizes for sealing connection of the stop valves. The side of the base is provided with multiple liquid inlets that are respectively connected to the bottom of the valve seats. The outlet of the hydraulic pump is connected to the liquid inlet corresponding to the valve seat on which the stop valve is installed through a pipe. The outlet of the hydraulic pump is connected to a pressure regulating valve and a pressure relief valve. A pressure gauge is connected to the end of the pipe near the liquid inlet.

2. The test apparatus for detecting leakage of a shut-off valve according to claim 1, characterized in that, The pressure relief valve is an electromagnetic pressure relief valve, and the pressure gauge is an electrical contact pressure gauge.

3. The test apparatus for detecting leakage of a shut-off valve according to claim 2, characterized in that, The valve seat has an internal thread on the top of its inner wall for sealing connection with the shut-off valve.

4. The test apparatus for detecting leakage of a shut-off valve according to claim 3, characterized in that, The valve seat has a sealing ring on its inner wall below the internal thread. The inner side of the sealing ring is a frustum shape, which is larger at the top and smaller at the bottom. The minimum inner diameter of the sealing ring is smaller than the inner diameter of the valve seat's internal thread.

5. The test apparatus for detecting leakage of a shut-off valve according to claim 4, characterized in that, The base has multiple return ports on the opposite side from the inlet, which are respectively connected to the side of the valve seat.

6. The test apparatus for detecting leakage of a shut-off valve according to claim 5, characterized in that, The gate valve leakage detection experimental device also includes an electrical control cabinet, which contains a power supply, a controller, and a time relay. The front of the electrical control cabinet has a start button, an emergency stop button, a manual / automatic switching knob, a pressure relief alarm, a manual pressure relief button, and a power indicator light. The signal input terminals of the controller are respectively connected to the start button, the emergency stop button, the manual / automatic switching knob, the manual pressure relief button, and the pressure gauge. The signal output terminals of the controller are respectively connected to the hydraulic pump, the time relay, the pressure relief valve, and the pressure relief alarm. The signal output terminal of the time relay is connected to the pressure relief valve. The power supply is respectively connected to the power indicator light, the controller, and the hydraulic pump.

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