A valve tightness testing device

Abstract

The application discloses a valve tightness test device and belongs to the technical field of valve test, which comprises a pressurizing box, a water injection pipe and a water discharge pipe connected to the front and rear ends of the pressurizing box respectively, a plurality of connecting pipes arranged on the side wall of the pressurizing box, and control valves arranged on the water injection pipe, the water discharge pipe and the connecting pipes; an adapter seat which is detachably connected to the connecting pipes and communicates with the connecting pipes at one end and communicates with the valve at the other end; a plurality of limiting mechanisms detachably arranged on each adapter seat; the test device can be used to test and detect the valve at the construction site before being installed on the pipeline, fills the vacancy of the construction site without corresponding test equipment, significantly improves the construction efficiency, does not have the risk of site flooding caused by leakage in unified water discharge detection, reduces the cost, and can simultaneously test and detect a plurality of valves to be tested, and can separately process or replace the detection of the problem valve, is high in flexibility, and is good in detection effect.

Description

Technical Field

[0001] This invention relates to the field of valve testing technology, and more specifically, to a valve tightness testing device. Background Technology

[0002] Valves are control components in fluid transport systems, used to control the flow direction, pressure, flow rate, and on / off state of media (such as gas, liquid, steam, etc.) in pipelines. Valve tightness testing is a method to test the sealing performance of valves, and its main purpose is to verify whether the valve can effectively prevent media leakage when closed.

[0003] During the construction of electromechanical pipelines, the leak testing of electromechanical valves is crucial. However, currently, when valves are transported from the factory to the construction site, the lack of corresponding testing equipment and the fact that most professional testing devices are complex, bulky, and require fixed installation in specific testing areas mean that valves are first installed on the electromechanical pipelines during on-site construction. After the pipeline system is completed, water is then used for unified testing, and valves found to be leaking are removed and replaced.

[0004] However, the above method is inconvenient. It is impossible to check whether the valve is qualified before installation. If problems are found after installation on the pipeline, the valve needs to be disassembled and replaced. It is difficult to disassemble and install valves on the already formed pipeline, which is time-consuming, labor-intensive, and has low construction efficiency. It slows down the construction process and affects the overall installation quality of the formed pipeline. In addition, if the valve leaks during unified drainage testing, there is a risk of flooding. The subsequent handling is complicated, and the cost of unified drainage testing and disassembly after forming is high.

[0005] Therefore, it is necessary to provide a valve tightness testing device to solve the above-mentioned technical problems. Summary of the Invention

[0006] The purpose of this invention is to provide a valve tightness testing device to solve the above-mentioned technical problems.

[0007] To achieve the above objectives, the present invention adopts the following technical solution:

[0008] A valve tightness testing device is used to test valves, wherein the valves are provided with flange joints, comprising:

[0009] The pressure testing box has a water injection pipe and a drain pipe connected to its front and rear ends, respectively. The side wall of the pressure testing box is provided with multiple connecting pipes, and control valves are installed on the water injection pipe, the drain pipe and the connecting pipes.

[0010] The adapter has one end detachably connected to and communicating with the connecting pipe, and the other end communicating with the valve. A connecting plate is provided on one side of the adapter.

[0011] Each of the adapters may be detachably equipped with multiple limiting mechanisms, which are used to restrict the valve on the adapter.

[0012] Furthermore, the limiting mechanism includes:

[0013] A support frame, wherein a limiting seat for limiting the flange joint is provided on the support frame;

[0014] The first adjustment component and the second adjustment component are both disposed on the support frame. The first adjustment component is used to drive the limiting seat to move along the axis of the connecting plate, and the second adjustment component is used to drive the limiting seat to move in a direction parallel to the end face of the connecting plate.

[0015] Furthermore, a blocking block is provided on the side wall of the limiting seat, and a retractable limiting block is provided at the end of the limiting seat. The side of the limiting block away from the adapter seat is set as an inclined surface.

[0016] Furthermore, the limiting seat has an inner cavity that is slidably connected to the limiting block, and an elastic element is provided between the bottom wall of the inner cavity and the limiting block.

[0017] Furthermore, the side wall of the limiting seat is provided with a sliding groove communicating with the inner cavity, and the side wall of the sliding groove is slidably connected to a push rod connected to the limiting block.

[0018] Furthermore, the side wall of the limiting seat is provided with a support rod, the bottom of the support rod is rotatably provided with a rotating shaft, the bottom of the rotating shaft is provided with a baffle, and a torsion spring connected to the support rod is provided on the rotating shaft.

[0019] Furthermore, the first adjustment component includes:

[0020] A sliding rod is disposed on the inner wall of the support frame, and a connecting block is slidably connected to the sliding rod. Screw holes are provided at both ends of the connecting block.

[0021] An adjustment hole is provided on the outer wall of the support frame, and a fastening bolt adapted to the screw hole is movably installed in the adjustment hole.

[0022] Furthermore, the second adjustment component includes:

[0023] A screw is threadedly connected to the connecting block, and one end of the screw is rotatably connected to the limiting seat;

[0024] A limiting rod, one end of which is located at one end of the limiting seat, and the other end of which slides through the connecting block.

[0025] Furthermore, a mounting block is provided on one side of the support frame, a slot is provided in the mounting block, and connecting holes communicating with the slot are provided on both sides of the mounting block. The adapter is provided with a plurality of mounting holes that are adapted to the connecting holes.

[0026] Furthermore, the bottom of the pressure box is provided with a support base plate, and omnidirectional wheels are installed at the four corners of the bottom of the support base plate.

[0027] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0028] 1. The testing device in this solution can test valves on the construction site before installing them onto the pipeline, filling the gap in the availability of corresponding testing equipment at construction sites. Unlike current methods that require valves to be installed on the pipeline and then drained to observe for leaks, this solution avoids the need to disassemble and reassemble problematic valves on the formed pipeline, saving significant time and effort, greatly improving construction efficiency, and significantly accelerating the construction process. It eliminates the need for disassembly and reassembly on the formed pipeline, preventing any impact on the overall quality of the formed pipeline, and eliminating the risk of flooding on-site due to leaks detected during drain testing. Costs are greatly reduced, making it highly practical and suitable for widespread use.

[0029] 2. This solution has multiple connecting pipes on the pressure testing box, which can simultaneously connect multiple valves to be tested to each connecting pipe for testing. Compared with testing a single valve, it saves more time, has higher testing efficiency, and reduces construction costs. Furthermore, if one or more valves experience leakage or other problems during the test, the control valve on the corresponding connecting pipe can be closed to handle or replace the problematic valves individually without affecting the testing of valves on other connecting pipes. It is highly flexible and has good testing results.

[0030] 3. This solution allows the valve to be tested to be installed on the adapter and fixed by a limiting mechanism. Operation is simple and convenient, making valve fixing, limiting, and installation / removal faster and easier, thereby improving the efficiency of valve testing and accelerating the construction process. Furthermore, the limiting mechanism can be adjusted to accommodate various valve specifications, offering high flexibility and meeting the needs of various situations. Different connecting pipes on the pressure testing box can test valves of different specifications, further expanding the applicability of this testing device. Attached Figure Description

[0031] Figure 1 This is a schematic diagram of the overall structure of the test device of the present invention when detecting the state of the valve under test;

[0032] Figure 2 for Figure 1 Enlarged structural diagram at point A in the diagram;

[0033] Figure 3This is an exploded structural diagram of the components on the connecting pipe of the present invention;

[0034] Figure 4 for Figure 3 Enlarged structural diagram at point B in the diagram;

[0035] Figure 5 for Figure 4 Enlarged structural diagram at point C;

[0036] Figure 6 This is a cross-sectional view of the limiting seat of the present invention;

[0037] Figure 7 This is a schematic diagram of the structure of the present invention when the baffle restricts the position of the push rod;

[0038] Figure 8 This is a schematic diagram of the adapter structure of the present invention;

[0039] Figure 9 This is a schematic diagram of the test device of the present invention when the valve to be tested is not installed.

[0040] Explanation of the labels in the diagram:

[0041] 1. Valve; 2. Flange joint; 3. Pressure testing box; 4. Water injection pipe; 5. Drain pipe; 6. Connecting pipe; 7. Control valve; 8. Adapter seat; 9. Limiting mechanism; 91. Support frame; 92. Limiting seat; 93. First adjusting assembly; 931. Slide rod; 932. Connecting block; 933. Adjusting hole; 934. Fastening bolt; 94. Second adjusting assembly; 941. Screw; 942. Limiting rod; 10. Blocking block; 11. Restricting block; 12. Inner cavity; 13. Elastic element; 14. Moving groove; 15. Push rod; 16. Support rod; 17. Rotating shaft; 18. Baffle; 19. Torsion spring; 20. Connecting plate; 21. Mounting block; 22. Slot; 23. Connecting hole; 24. Mounting hole; 25. Support base plate; 26. Caster wheel; 27. First flange; 28. Second flange. Detailed Implementation

[0042] 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.

[0043] Please see Figure 1-9 A valve tightness testing device is used to test valve 1, which has a flange joint 2.

[0044] The pressure testing box 3 has a water injection pipe 4 and a drain pipe 5 connected to its front and rear ends, respectively. Multiple connecting pipes 6 are provided on the side wall of the pressure testing box 3. Control valves 7 are installed on the water injection pipe 4, drain pipe 5 and connecting pipes 6. In this scheme, the control valves 7 can be butterfly valves or gate valves. Pressure gauges and stopcocks are installed on the pressure testing box 3.

[0045] The adapter 8 has one end detachably connected to and communicating with the connecting pipe 6, and the other end communicating with the valve 1. A connecting plate 20 is provided on one side of the adapter 8.

[0046] Each adapter 8 can be detachably installed with multiple limiting mechanisms 9, which are used to restrict the valve 1 on the adapter 8.

[0047] Before use, first test and debug the experimental apparatus. Connect the water injection pipe 4 of the pressure tank 3 to the external pressure pump. Close the control valve 7 on the drain pipe 5 and the control valve 7 on each connecting pipe 6. Then start the pressure pump and inject the medium into the pressure tank 3 through the water injection pipe 4. Set the pressure control module to a low pressure value and observe whether there are any leaks in the pressure storage tank and on each test connecting pipe 6. If a leak is found, stop the machine immediately. After confirming that there are no leaks, gradually increase the pressure until it reaches the pressure required for the test. Check the accuracy and real-time performance of the pressure gauge data transmission to ensure that the entire apparatus is operating normally.

[0048] After debugging and inspection, first ensure that the control valve 7 on each connecting pipe 6 is closed. Install the valve to be tested 1 to the end of the connecting pipe 6, ensuring that the valve to be tested 1 is in the closed state. Then open the control valve 7, and the medium in the pressure tank 3 and connecting pipe 6 will flow to the valve to be tested 1. At this time, observe whether the valve to be tested 1 has any leakage. If there are no abnormalities, the medium can be pressurized by a pressure pump and sent to the pressure tank 3, and then into each connecting pipe 6 until the pressure reaches the test pressure value. Then close the control valve 7 on the water injection pipe 4. This allows the pressure tank 3 and connecting pipe 6 to maintain pressure. During this process, the staff should observe the pressure data in real time and check whether there is any leakage or abnormality at the valve to be tested 1. This allows for the determination of whether the valve to be tested 1 is qualified, thus completing the test of the valve to be tested 1.

[0049] In summary, this solution utilizes a testing device to inspect valve 1 transported to the construction site before installation onto the pipeline. This fills the gap in the availability of corresponding testing equipment at construction sites. Unlike current methods that require valve 1 to be installed on the pipeline, formed, and then drained to observe for leaks, this solution avoids the need to disassemble and reassemble problematic valve 1 on the formed pipeline, saving significant time and effort, greatly improving construction efficiency, and significantly accelerating the construction process. The elimination of disassembly and reassembly on the formed pipeline prevents impact on the overall quality of the formed pipeline and eliminates the risk of flooding due to leaks detected during drainage testing. Costs are greatly reduced, making this solution highly practical and suitable for widespread use.

[0050] Furthermore, the pressure testing chamber 3 of this solution has multiple connecting pipes 6, allowing multiple valves 1 to be tested to be connected to each connecting pipe 6 simultaneously for testing. Compared to testing a single valve 1, this saves significantly more time, greatly improves testing efficiency, and reduces both time and construction costs. Moreover, if one or more valves 1 experience leakage or other problems during the test, the control valve 7 on the corresponding connecting pipe 6 can be closed, and the problematic valves 1 can be individually addressed or replaced for testing. This does not affect the testing of valves 1 on other connecting pipes 6 of the pressure testing chamber 3, offering high flexibility and excellent testing results.

[0051] In this design, when connecting the valve 1 to be tested to the connecting pipe 6, the valve 1 can be installed on the adapter 8, so that the flange joint 2 of the valve 1 is tightly attached to the connecting plate 20 of the adapter 8. The valve 1 is then fixed to the adapter 8 by the limiting mechanism 9, making the operation simple and convenient. This makes fixing, limiting, and disassembling the valve 1 faster and easier, thereby improving the efficiency of valve testing and accelerating the construction process. Furthermore, the limiting mechanism 9 can be adjusted to accommodate various specifications of valve 1. That is, when the flange joint 2 of different specifications of valve 1 has different thicknesses and diameters, the limiting mechanism 9 can be adjusted to adaptively restrict and fix the valve 1, providing high flexibility and meeting the needs of various situations. Moreover, different connecting pipes 6 on the pressure test box 3 can test valves of different specifications, further improving the applicability of this testing device.

[0052] Furthermore, if a valve 1 is outside the fixed range of the limiting mechanism 9, the adapter 8 on the connecting pipe 6 can be disassembled and replaced to accommodate the valve 1 under test, thereby meeting different needs and making the device more versatile. The number of adapters 8 installed to limit the limiting mechanism 9 can also be selected according to specific requirements.

[0053] In this embodiment, preferably, please refer to [reference needed]. Figure 2-7 The limiting mechanism 9 includes:

[0054] Support frame 91, on which a limiting seat 92 for limiting flange joint 2 is provided;

[0055] The first adjustment component 93 and the second adjustment component 94 are both disposed on the support frame 91. The first adjustment component 93 is used to drive the limiting seat 92 to move along the axis of the connecting plate 20, and the second adjustment component 94 is used to drive the limiting seat 92 to move in a direction parallel to the end face of the connecting plate 20.

[0056] Specifically, after the flange joint 2 of valve 1 is tightly attached to the connecting plate 20 of the adapter seat 8, the flange joint 2 can be restricted by the limiting seat 92, so that the flange joint 2 is connected to the connecting plate 20, thus ensuring the connection stability of valve 1.

[0057] The first adjusting component 93 can drive the limiting seat 92 to move along the axis of the connecting plate 20, thereby limiting and fixing flange joints 2 of different thicknesses; the second adjusting component 94 can drive the limiting seat 92 to move in a direction parallel to the end face of the connecting plate 20, thereby limiting and fixing flange joints 2 of different diameters. Thus, the adjustment of the limiting seat 92 by the first adjusting component 93 and the second adjusting component 94 can meet the limiting and fixing of valves 1 of various specifications.

[0058] In this embodiment, preferably, please refer to [reference needed]. Figure 2-7 A blocking block 10 is provided on the side wall of the limiting seat 92, and a retractable limiting block 11 is provided at the end of the limiting seat 92. The side of the limiting block 11 away from the adapter seat 8 is set as an inclined surface.

[0059] Specifically, the blocking blocks 10 of the multiple limit seats 92 can support and block the outer side of the flange joint 2, so that the flange joint 2 cannot move in a direction parallel to the end face of the connecting plate 20, and the end face of the flange joint 2 is restricted by the limiting block 11, so that the flange joint 2 cannot move in the axial direction of the connecting plate 20, thus restricting the flange joint 2.

[0060] After the position of the limit seat 92 is adjusted, when the flange joint 2 is brought close to the connecting plate 20, the flange joint 2 will move along the limit seats 92 and squeeze the limiting block 11 to compress it and enter the limit seat 92. When the flange joint 2 passes the limiting block 11, the limiting block 11 will reset and limit the flange joint 2. The limiting and fixing of the flange joint 2 and the valve 1 are completed by the cooperation of the blocking block 10 and the limiting block 11.

[0061] In this embodiment, preferably, please refer to [reference needed]. Figure 6The limiting seat 92 has an inner cavity 12 that is slidably connected to the limiting block 11. An elastic element 13 is provided between the bottom wall of the inner cavity 12 and the limiting block 11. In this solution, the elastic element 13 can be a spring or in combination with a damper.

[0062] With this design, when the limiting block 11 is compressed, it will move towards the inner cavity 12 and compress the elastic element 13. When the limiting block 11 is no longer compressed, the rebound force of the elastic element 13 will cause the limiting block 11 to reset. By allowing the limiting block 11 to enter the inner cavity 12, the flange joint 2 can be removed from the connecting plate 20, completing the disassembly of the valve 1 in a simple and quick manner.

[0063] In this embodiment, preferably, please refer to [reference needed]. Figure 4-7 The side wall of the limiting seat 92 is provided with a sliding groove 14 that communicates with the inner cavity 12, and the side wall of the sliding groove 14 is slidably connected with a push rod 15 that is connected to the limiting block 11.

[0064] This design allows the limiting block 11 to be moved by pushing the push rod 15, making it easier and faster to move the limiting block 11 without having to push it manually.

[0065] In this embodiment, preferably, please refer to [reference needed]. Figure 4-7 The side wall of the limiting seat 92 is provided with a support rod 16, the bottom of the support rod 16 is rotatably provided with a rotating shaft 17, the bottom of the rotating shaft 17 is provided with a baffle 18, and the rotating shaft 17 is provided with a torsion spring 19 connected to the support rod 16.

[0066] With this design, when valve 1 is disassembled, the push rod 15 is pushed to move the limiting block 11 into the inner cavity 12. After the push rod 15 passes the position of the baffle 18, the baffle 18 and the rotating shaft 17 are rotated so that the baffle 18 is rotated to the position of the push rod 15. After the push rod 15 is opened, the push rod 15 will be blocked by the baffle 18. The push rod 15 will put pressure on the baffle 18. At this time, the torsion spring 19 is compressed or stretched.

[0067] After valve 1 is removed, push rod 15 can be pushed to disengage it from baffle 18. The rebound force of torsion spring 19 will cause baffle 18 to rotate and reset. Then, push rod 15 can be released, and the rebound force of elastic element 13 will drive the limiting block 11 to reset.

[0068] In this embodiment, preferably, please refer to [reference needed]. Figure 3-4 and Figure 7 The first adjustment component 93 includes:

[0069] A slide rod 931 is set on the inner wall of the support frame 91, and a connecting block 932 is slidably connected to the slide rod 931. The two ends of the connecting block 932 are provided with screw holes.

[0070] An adjustment hole 933 is provided on the outer wall of the support frame 91, and a fastening bolt 934 adapted to the screw hole is movably provided in the adjustment hole 933.

[0071] Specifically, after loosening the fastening bolt 934, the connecting block 932 can move along the sliding rod 931. This causes the connecting block 932 to move the limiting seat 92, allowing adjustment of the distance between the limiting seat 92 and the connecting plate 20 of the adapter 8 to accommodate flange joints 2 of different thicknesses. After adjustment, the fastening bolt 934 is tightened to ensure a tight fit between it and the outer wall of the support frame 91, thus fixing the connecting block 932 to the support frame 91.

[0072] In this embodiment, preferably, please refer to [reference needed]. Figure 3-4 and Figure 7 The second adjustment component 94 includes:

[0073] The screw 941 is threadedly connected to the connecting block 932, and one end of the screw 941 is rotatably connected to the limit seat 92;

[0074] The limiting rod 942 has one end located at one end of the limiting seat 92, and the other end slides through the connecting block 932.

[0075] Specifically, the rotation of the limiting seat 92 is restricted by the limiting rod 942. As the screw 941 rotates, it moves, which in turn moves the limiting seat 92. The limiting seat 92 then moves the limiting rod 942 along the connecting block 932. This allows for adjustment of the distance between the various limiting seats 92 on the adapter 8, enabling the adjustment of the position of the limiting seat 92 according to the different diameters of the flange joints 2 on different valves 1, thus providing a wide range of applications.

[0076] In this embodiment, preferably, please refer to [reference needed]. Figure 2-4 and Figure 8 A mounting block 21 is provided on one side of the support frame 91. A slot 22 is provided in the mounting block 21. Connecting holes 23 communicating with the slot 22 are provided on both sides of the mounting block 21. Multiple mounting holes 24 that are adapted to the connecting holes 23 are provided on the adapter 8.

[0077] With this design, when the support frame 91 is installed onto the adapter 8, the slot 22 of the mounting block 21 can be engaged with the adapter 8, and the connecting hole 23 can be aligned with the mounting hole 24 of the adapter 8. By passing bolts through the connecting hole 23 and the mounting hole 24, and then fixing them with nuts, the mounting block 21 can be fixed onto the adapter 8, thus completing the fixation of the support frame 91.

[0078] For preferred options, please refer to [link / reference]. Figure 2-3 and Figure 8The adapter 8 is provided with a first flange 27 at one end away from the connecting plate 20, and the end of the connecting pipe 6 is provided with a second flange 28 that is adapted to the first flange 27.

[0079] With this design, when the adapter 8 is installed onto the connecting pipe 6, the first flange 27 is aligned with the second flange 28 of the connecting pipe 6, and then it is fixed with bolts. The adapter 8 can be disassembled and replaced as needed.

[0080] In this embodiment, preferably, please refer to [reference needed]. Figure 1 and Figure 9 The bottom of the pressure box 3 is provided with a support base plate 25, and universal wheels 26 are installed at the four corners of the bottom of the support base plate 25.

[0081] This design allows the support base plate 25 and pressure testing box 3 to be moved via the casters 26, facilitating the movement of the pressure testing box 3 on the construction site and making it suitable for various environments. It is particularly suitable for rapid and efficient testing of various valves 1 in different working scenarios. It can be flexibly transported to various work sites, eliminating the need to transport the valves 1 long distances to a fixed testing site, significantly saving manpower, material resources, and time costs.

[0082] It should be understood that the examples and embodiments described herein are for illustrative purposes only and are not intended to limit the invention. Those skilled in the art can make various modifications or changes based on them. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the invention should be included within the protection scope of the invention.

[0083] It should be noted that if the embodiments of the present invention involve directional indicators such as up, down, left, right, front, back, etc., the directional indicators are only used to explain the relative positional relationship and movement of the components in a specific posture as shown in the attached figure. If the specific posture changes, the directional indicators will also change accordingly.

[0084] Furthermore, if the embodiments of this invention involve descriptions such as "first" or "second," these descriptions are for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined with "first" or "second" may explicitly or implicitly include at least one of those features. Additionally, the meaning of "and / or" throughout the text includes three parallel solutions; for example, "A and / or B" includes solution A, solution B, or a solution where both A and B are satisfied simultaneously. Furthermore, "multiple" refers to two or more. Moreover, the technical solutions of the various embodiments can be combined with each other, but this must be based on the ability of those skilled in the art to implement them. When the combination of technical solutions is contradictory or impossible to implement, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection claimed by this invention.

Claims

1. A valve tightness testing device for testing a valve (1), wherein the valve (1) is provided with a flange joint (2), characterized in that, include: The pressure test box (3) is connected to a water injection pipe (4) and a drain pipe (5) at its front and rear ends respectively. Multiple connecting pipes (6) are provided on the side wall of the pressure test box (3). Control valves (7) are installed on the water injection pipe (4), the drain pipe (5) and the connecting pipes (6). The adapter (8) has one end detachably connected to and communicates with the connecting pipe (6), and the other end communicates with the valve (1). A connecting plate (20) is provided on one side of the adapter (8). Each of the adapters (8) may be detachably installed with a plurality of limiting mechanisms (9), which are used to restrict the valve (1) on the adapter (8); The limiting mechanism (9) includes: A support frame (91) is provided with a limiting seat (92) for limiting the flange joint (2). The first adjustment component (93) and the second adjustment component (94) are both disposed on the support frame (91). The first adjustment component (93) is used to drive the limiting seat (92) to move along the axis of the connecting plate (20). The second adjustment component (94) is used to drive the limiting seat (92) to move along a direction parallel to the end face of the connecting plate (20). A blocking block (10) is provided on the side wall of the limiting seat (92), and a retractable limiting block (11) is provided at the end of the limiting seat (92). The side of the limiting block (11) away from the adapter (8) is set as an inclined surface. The limiting seat (92) has an inner cavity (12) that is slidably connected to the limiting block (11), and an elastic element (13) is provided between the bottom wall of the inner cavity (12) and the limiting block (11). The side wall of the limiting seat (92) is provided with a sliding groove (14) communicating with the inner cavity (12), and the side wall of the sliding groove (14) is slidably connected with a push rod (15) connected to the limiting block (11). The side wall of the limiting seat (92) is provided with a support rod (16), and the bottom of the support rod (16) is rotatably provided with a rotating shaft (17). The bottom of the rotating shaft (17) is provided with a baffle (18), and the rotating shaft (17) is provided with a torsion spring (19) connected to the support rod (16).

2. The valve tightness testing device according to claim 1, characterized in that, The first adjustment component (93) includes: A slide rod (931) is provided on the inner wall of the support frame (91), and a connecting block (932) is slidably connected to the slide rod (931). The two ends of the connecting block (932) are provided with screw holes. An adjustment hole (933) is provided on the outer wall of the support frame (91), and a fastening bolt (934) adapted to the screw hole is movably provided in the adjustment hole (933).

3. The valve tightness testing device according to claim 2, characterized in that, The second adjustment component (94) includes: The screw (941) is threadedly connected to the connecting block (932), and one end of the screw (941) is rotatably connected to the limiting seat (92); The limiting rod (942) has one end located at one end of the limiting seat (92) and the other end sliding through the connecting block (932).

4. The valve tightness testing device according to claim 1, characterized in that, A mounting block (21) is provided on one side of the support frame (91). A slot (22) is provided in the mounting block (21). Connecting holes (23) communicating with the slot (22) are provided on both sides of the mounting block (21). Multiple mounting holes (24) that are adapted to the connecting holes (23) are provided on the adapter (8).

5. The valve tightness testing device according to claim 1, characterized in that, The bottom of the pressure box (3) is provided with a support base plate (25), and universal wheels (26) are installed at the four corners of the bottom of the support base plate (25).

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