A safety valve setting pressure and back pressure test integrated device

Abstract

The utility model discloses a safety valve setting pressure and back pressure test integration device belongs to valve pressure test equipment field, and it is including: operation panel, be equipped with with gas source intercommunication's inlet valve and pressure -relief valve on operation panel, and inlet valve and pressure -relief valve are connected to safety valve through pipeline, to adjust and control the gas pressure in test pipeline, support platform, and safety valve is placed on support platform, safety valve clamping device, safety valve clamping device sets up on support platform, and the clamping end of safety valve clamping device respectively acts on the import end and export end of safety valve, to realize the synchronous fixing of both, pressure passageway switching device, one end of pressure passageway switching device is connected with gas source through pipeline, and the other end is connected with the import end and export end of safety valve through pipeline respectively, and the communication state of the flow passage inside pressure passageway switching device is changed, and the import end or export end of safety valve is selectively conducted with gas source, and the consistency of test safety and result is ensured.

Description

Technical Field

[0001] This utility model relates to the field of valve pressure testing equipment, specifically to an integrated device for testing the set pressure and back pressure of a safety valve. Background Technology

[0002] As a critical safety accessory for pressure-bearing equipment such as boilers and pressure vessels, the reliability of safety valves directly affects the operational safety of the equipment. According to the "Safety Valve Safety Technical Supervision Regulations," safety valves typically require annual pressure calibration to confirm whether their opening pressure meets the standards. For safety valves operating under back pressure conditions at the outlet, the calibration regulations also require a back pressure test, which involves applying pressure from the outlet end of the safety valve to test the sealing performance of its sealing surface and connection parts. Currently, safety valve calibration agencies generally use dedicated calibration equipment. This type of equipment is usually equipped with a clamping device and a pressure test interface, and completes the test of the safety valve's set pressure through a standardized process.

[0003] Because the existing calibration equipment is only equipped with a single clamping fixture, when the set pressure test and back pressure test need to be performed sequentially, the operator must manually remove the safety valve from the clamping device after completing the previous test, adjust its direction, and reinstall and fix it so that its outlet end is connected to the test interface. This repetitive clamping process not only increases the operator's labor intensity and reduces calibration efficiency, but also brings the risk of personal injury and equipment collision during the handling of heavy safety valves. At the same time, manual flipping and repeated positioning may also affect the alignment of the valve and the fixture, thus potentially affecting the accuracy and repeatability of the test results. Utility Model Content

[0004] The purpose of this invention is to address the shortcomings of the aforementioned technologies by proposing an integrated device for safety valve setting pressure and back pressure testing, aiming to solve the problems of repeated clamping, low efficiency, and safety risks associated with single-tool setups.

[0005] This utility model provides an integrated device for safety valve setting pressure and back pressure testing, comprising: an operating table, on which an inlet valve and a pressure relief valve connected to a gas source are provided, and the inlet valve and pressure relief valve are connected to a safety valve through pipelines to regulate and control the gas pressure in the test pipeline; a support platform, on which the safety valve is placed; a safety valve clamping device, which is set on the support platform, and the clamping ends of the safety valve clamping device act on the inlet and outlet ends of the safety valve respectively to achieve synchronous fixation of the two; and a pressure path switching device, one end of which is connected to the gas source through a pipeline, and the other end is connected to the inlet and outlet ends of the safety valve through pipelines respectively. By changing the connection state of the internal flow channel of the pressure path switching device, the gas source is selectively connected to the inlet or outlet end of the safety valve.

[0006] Preferably, the safety valve clamping device includes an inlet three-jaw clamp and an outlet clamp assembly. The inlet three-jaw clamp is used to clamp and seal the inlet end of the safety valve, and the outlet clamp assembly is used to clamp and seal the outlet end of the safety valve. A position adjustment assembly is also provided on the support platform. The output end of the position adjustment assembly is connected to the outlet clamp assembly, and the position adjustment assembly is used to adjust the relative position between the outlet clamp assembly and the outlet end of the safety valve.

[0007] Preferably, the position adjustment assembly includes a fixed frame, which is fixedly installed on the side wall of the support platform. A linear module that can drive the outlet clamp assembly to move in the vertical direction is installed on the fixed frame. A mounting plate is fixedly installed on the surface of the linear module. A fixed plate is fixedly installed on the mounting plate. A slide rail is fixedly installed on the surface of the fixed plate. An electric slider is slidably installed on the slide rail. A clamp support plate is fixedly installed on the upper surface of the electric slider.

[0008] Preferably, the outlet clamp assembly includes an outlet three-jaw clamp, which is fixedly mounted on a clamp support plate. A hydraulic cylinder is also mounted on the clamp support plate. The output end of the hydraulic cylinder passes through the outlet three-jaw clamp, and a sealing flange is fixedly mounted on the output end of the hydraulic cylinder. An oil pump is connected to the hydraulic cylinder to provide hydraulic power. The oil pump drives the output end of the hydraulic cylinder to move the sealing flange along the length of the hydraulic cylinder to complete the sealing of the outlet end of the safety valve.

[0009] Preferably, the pressure path switching device is a three-way valve, which is interconnected with the gas source, the inlet of the safety valve, and the outlet of the safety valve.

[0010] Preferably, the three-way valve is an electromagnetically controlled valve, electrically connected to the control system, and automatically controls the switching sequence of the set pressure test and the back pressure test through a preset program.

[0011] Preferably, pressure sensors are embedded in the inner sides of the jaws of the inlet three-jaw clamp and the outlet three-jaw clamp to monitor the clamping force in real time and feed it back to the control system.

[0012] Preferably, the sealing surface of the sealing flange includes an outer metal sealing ring with a stepped structure and an inner elastic sealing layer.

[0013] Compared with existing technologies, it has the following beneficial effects: This invention provides an integrated device for safety valve setting pressure and back pressure testing. The safety valve clamping device simultaneously secures the inlet and outlet ends of the safety valve in a single clamping operation. Combined with the pressure path switching device, after completing the setting pressure test, operators can directly perform back pressure testing without disassembling and re-clamping the safety valve. This fundamentally avoids the cumbersome operation caused by repeated clamping, improving testing efficiency. By eliminating multiple disassembly, assembly, and handling of the safety valve during testing, the labor intensity of operators is reduced, avoiding the risk of equipment damage from multiple clamping operations and the testing errors introduced by repeated positioning. While improving operational safety, it also ensures the consistency and accuracy of test results. Through structural integration and optimized testing processes, testing efficiency, operational safety, and result reliability are simultaneously improved. Attached Figure Description

[0014] To more clearly illustrate the technical solutions in the embodiments of this utility model, the drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only preferred embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0015] Figure 1 This is a schematic diagram of the overall structure of a safety valve set pressure and back pressure testing device according to an embodiment of the present invention. Figure 2 This is a schematic diagram of the position adjustment component of a safety valve set pressure and back pressure testing device according to an embodiment of the present invention; Figure 3 This is a schematic diagram showing the connection relationship between the sealing flange and the outlet end of the safety valve in a safety valve set pressure and back pressure testing device according to an embodiment of the present invention. Figure 4 This is a pneumatic circuit diagram of a safety valve set pressure and back pressure testing device according to an embodiment of the present invention.

[0016] In the diagram, 1. Control panel; 2. Inlet valve; 3. Pressure relief valve; 4. Safety valve; 5. Support platform; 6. Inlet three-jaw clamp; 7. Outlet clamp assembly; 701. Outlet three-jaw clamp; 702. Hydraulic cylinder; 703. Sealing flange; 704. Oil pump; 8. Position adjustment assembly; 801. Fixture; 802. Linear module; 803. Mounting plate; 804. Fixing plate; 805. Slide rail; 806. Electric slider; 807. Clamp support plate; 9. Metal sealing ring; 10. Elastic sealing layer. Detailed Implementation

[0017] This section will describe in detail the specific embodiments of the present invention. Preferred embodiments of the present invention are shown in the accompanying drawings. The purpose of the drawings is to supplement the textual description with graphics, so that people can intuitively and vividly understand each technical feature and the overall technical solution of the present invention, but they should not be construed as limiting the scope of protection of the present invention.

[0018] like Figure 1 As shown, this utility model provides an integrated device for safety valve setting pressure and back pressure testing, including: an operating table 1, on which an inlet valve 2 and a pressure relief valve 3 connected to a gas source are provided. The inlet valve 2 and the pressure relief valve 3 are connected to a safety valve 4 through pipelines to regulate and control the gas pressure in the test pipeline; a support platform 5, on which the safety valve 4 is placed; a safety valve clamping device, which is set on the support platform 5, and the clamping ends of the safety valve clamping device act on the inlet and outlet ends of the safety valve 4 respectively to achieve synchronous fixation of the two; and a pressure path switching device, one end of which is connected to the gas source through a pipeline, and the other end is connected to the inlet and outlet ends of the safety valve 4 through pipelines respectively. By changing the connection state of the internal flow channel of the pressure path switching device, the gas source is selectively connected to the inlet or outlet end of the safety valve 4.

[0019] Specifically, by setting a safety valve clamping device and a pressure path switching device in the testing apparatus and integrating them on the support platform 5 and the operating platform 1, during the test, the safety valve 4 is clamped and fixed at once by the safety valve clamping device, with its inlet and outlet ends clamped simultaneously. The pressure path switching device is connected to the inlet and outlet ends of the safety valve 4 respectively, and the direction of the test pressure is controlled by switching the air path. In the normal test procedure, the operator first connects the air source to the inlet end of the safety valve 4 through the pressure path switching device. The air inlet valve 2 and the pressure relief valve 3 on the operating platform 1 work together to control the inlet pressure and perform the set pressure test. After completing this test, there is no need to disassemble the safety valve 4. The air source is directly switched to the outlet end of the safety valve 4 through the pressure path switching device. Similarly, the outlet pressure is controlled by the air inlet valve 2 and the pressure relief valve 3 to perform the back pressure test.

[0020] This invention achieves one-time clamping and fixing through a safety valve clamping device. Combined with the switching function of the pressure path switching device, it enables the set pressure test and back pressure test to be completed continuously at the same station. This avoids the cumbersome operation of clamping and adjusting the direction of the safety valve 4 required in the traditional method, improves testing efficiency, reduces the labor intensity of operators, and eliminates the risk of equipment collision and positioning error that may be caused by repeated clamping and handling of the safety valve 4. Thus, while ensuring testing safety, it also ensures the accuracy and reliability of the test results.

[0021] Optionally, the safety valve clamping device includes an inlet three-jaw clamp 6 and an outlet clamp assembly 7. The inlet three-jaw clamp 6 is used to clamp and seal the inlet end of the safety valve 4, and the outlet clamp assembly 7 is used to clamp and seal the outlet end of the safety valve 4. A position adjustment assembly 8 is also provided on the support platform 5. The output end of the position adjustment assembly 8 is connected to the outlet clamp assembly 7, and the position adjustment assembly 8 is used to adjust the relative position between the outlet clamp assembly 7 and the outlet end of the safety valve 4.

[0022] Specifically, such as Figure 1-2 As shown, the inlet three-jaw clamp 6 is fixedly mounted on the support platform 5 for positioning and sealing the inlet end of the safety valve 4. When sealing the inlet end of the safety valve 4, a sealing flange 703 is also used. The sealing flange 703 component at the inlet end of the safety valve 4 is not shown in the figure. It is the same as the sealing flange 703 used at the outlet end of the subsequent safety valve 4. The outlet clamp assembly 7 is mounted on the support platform 5 through the position adjustment assembly 8. Its relative position with the inlet three-jaw clamp 6 can be adjusted according to the actual size of the safety valve 4. The position adjustment assembly 8 is driven by a motor to realize the precise movement of the outlet clamp assembly 7 in the horizontal and vertical directions, ensuring that the safety valve 4 can obtain the best docking position when clamped.

[0023] In this embodiment, when the safety valve 4 needs to be tested, the operator first places the inlet end of the safety valve 4 in the inlet three-jaw clamp 6 and initially fixes it. Then, the position adjustment component 8 drives the outlet clamp component 7 to move, so that it is precisely aligned with the outlet end of the safety valve 4 and clamped. This adjustable design allows the device to adapt to the testing requirements of safety valves 4 of different specifications and sizes, ensuring the stability of clamping and the reliability of sealing, and improving the versatility and applicability of the equipment. Through the precise positioning function of the position adjustment component 8, it is ensured that the safety valve 4 always maintains the correct installation posture during the test, providing a reliable guarantee for obtaining accurate test results.

[0024] Optionally, the position adjustment assembly 8 includes a fixing frame 801, which is fixedly installed on the side wall of the support platform 5. A linear module 802 that can drive the exit clamp assembly 7 to move in the vertical direction is installed on the fixing frame 801. A mounting plate 803 is fixedly installed on the surface of the linear module 802. A fixing plate 804 is fixedly installed on the mounting plate 803. A slide rail 805 is fixedly installed on the surface of the fixing plate 804. An electric slider 806 is slidably installed on the slide rail 805. A clamp support plate 807 is fixedly installed on the upper surface of the electric slider 806.

[0025] Specifically, such as Figure 2As shown, the position adjustment component 8 adopts a modular design. The fixed frame 801 is fixed to the side wall of the support platform 5 by high-strength bolts to form a stable support foundation. The linear module 802 is installed on the fixed frame 801. The precise lifting and lowering movement of the outlet clamp component 7 is realized through the servo control system. The mounting plate 803 serves as a connecting conversion component, converting the vertical movement of the linear module 802 into the vertical movement of the fixed plate 804. The slide rail 805 is horizontally installed on the fixed plate 804. The electric slider 806 moves back and forth along the slide rail 805. Finally, the clamp support plate 807 drives the outlet clamp component 7 to achieve precise adjustment of its horizontal position.

[0026] In this embodiment, the precise positioning of the outlet clamp assembly 7 in both vertical and horizontal directions is achieved through the coordinated operation of the linear module 802 and the slide rail 805. When facing safety valves 4 of different specifications, the linear module 802 first drives the outlet clamp assembly 7 to rise and fall to a suitable height, ensuring that the center line of the clamp is horizontally aligned with the outlet end of the safety valve 4. Subsequently, the electric slider 806 moves along the slide rail 805 to adjust the docking distance between the outlet clamp assembly 7 and the outlet end of the safety valve 4. This dual-degree-of-freedom adjustment mechanism ensures that safety valves 4 of different sizes can obtain the optimal clamping position, guaranteeing complete contact of the sealing surface and avoiding sealing failure or equipment damage caused by misaligned installation. The high-precision characteristics of the linear module 802 ensure the consistency of repeated positioning, and the programmed control of the electric slider 806 further improves the automation level of the equipment and enhances the reliability and stability of testing efficiency.

[0027] Optionally, the outlet clamp assembly 7 includes an outlet three-jaw clamp 701, which is fixedly mounted on a clamp support plate 807. A hydraulic cylinder 702 is also mounted on the clamp support plate 807. The output end of the hydraulic cylinder 702 passes through the outlet three-jaw clamp 701, and a sealing flange 703 is fixedly mounted on the output end of the hydraulic cylinder 702. An oil pump 704 is connected to the hydraulic cylinder 702 to provide hydraulic power. The oil pump 704 drives the output end of the hydraulic cylinder 702 to move the sealing flange 703 along the length of the hydraulic cylinder 702 to complete the sealing of the outlet end of the safety valve 4.

[0028] Specifically, such as Figure 1-2 As shown, the outlet three-jaw clamp 701 is fixed to the clamp support plate 807 by bolts. The included angle between its three jaws is evenly distributed at 120°. It is opened and closed synchronously by hydraulic drive. The hydraulic cylinder 702 is installed on the back of the clamp support plate 807. Its piston rod passes through the central through hole of the outlet three-jaw clamp 701. A sealing flange 703 is installed at the front end. The sealing surface of the sealing flange 703 is made of rubber material, which can adapt to the surface condition of the outlet end of different specifications of safety valve 4. The oil pump 704 is connected to the hydraulic cylinder 702 through the hydraulic pipeline to provide stable hydraulic power.

[0029] In this embodiment, after the outlet end of the safety valve 4 is positioned, the outlet three-jaw clamp 701 first actuates, with the three jaws retracting synchronously to reliably clamp the outlet end of the safety valve 4. Subsequently, the hydraulic cylinder 702, driven by the oil pump 704, pushes the sealing flange 703 forward until it is tightly fitted with the outlet end face of the safety valve 4 to form an effective seal, ensuring the stability of the clamping and the reliability of the seal. The stable pressure provided by the hydraulic system allows the sealing flange 703 to adapt to safety valves 4 of different sizes while maintaining a constant sealing specific pressure to prevent media leakage during the test. Through the synergistic effect of mechanical clamping and hydraulic sealing, the device can maintain a stable sealing state throughout the test, ensuring the accuracy and reliability of the test data and improving the safety and automation of the test process.

[0030] Optionally, the pressure path switching device is a three-way valve, which is connected to the gas source, the inlet of safety valve 4 and the outlet of safety valve 4 respectively.

[0031] Specifically, such as Figure 4 As shown, the three ports of the three-way valve are connected to the main gas supply pipe, the test pipe at the inlet of safety valve 4, and the test pipe at the outlet of safety valve 4 through the high-pressure pipeline, respectively. The valve core structure adopts a T-shaped or L-shaped flow channel design. The valve core is driven by an electromagnet to switch between two working positions. One path connects the gas supply to the inlet of safety valve 4 for pressure setting test, and the other path connects the gas supply to the outlet of safety valve 4 for back pressure test.

[0032] In this embodiment, the integrated application of a three-way valve enables rapid and reliable switching of the test air path. During the set pressure test, the three-way valve switches to the inlet test position, allowing compressed air to directly enter the inlet chamber of safety valve 4, simulating the normal working pressure state of safety valve 4. When switching to back pressure testing, the three-way valve switches to the outlet test position, guiding the pressure medium to the outlet end of safety valve 4, simulating the sealing performance of safety valve 4 under system back pressure conditions. This centralized control switching method not only avoids the cumbersome operation of manually disconnecting pipelines in traditional methods, improving testing efficiency, but more importantly, it eliminates the risk of leakage that may be caused by multiple connections, ensuring the sealing integrity of the test system and the accuracy of test data. At the same time, the electromagnetic drive method provides a foundation for the automated control of the test process, further enhancing the intelligence level of the equipment.

[0033] Optionally, the three-way valve is an electromagnetically controlled valve, electrically connected to the control system, and automatically controls the switching sequence of the set pressure test and back pressure test through a preset program.

[0034] Specifically, such as Figure 4As shown, the electromagnetic control valve is connected to the device's control system via a cable. The three ports on the valve body are connected to the main gas supply pipe, the inlet test pipe of safety valve 4, and the outlet test pipe, respectively. According to the preset test procedure, the control system sends an electrical signal to the electromagnetic valve to drive its internal valve core to move, thereby realizing the automatic switching of the test gas path. In the standby state or after the test is completed, the electromagnetic valve can be switched to the neutral position or the exhaust position to ensure that there is no residual pressure in the system.

[0035] In this embodiment, by setting the three-way valve to electromagnetic control and integrating it with the control system, the switching between the set pressure test and the back pressure test is automated. After the set pressure test is completed, the control system issues a command, and the solenoid valve switches positions, switching the gas source from the inlet end of safety valve 4 to the outlet end. No manual intervention is required, which improves the testing efficiency, significantly shortens the switching time between the two test items, eliminates the risk of incorrect switching caused by human operation, ensures the standardization of the testing process and the repeatability of the test results, and ensures the timeliness and accuracy of the pressure switching by the rapid response characteristics of the solenoid valve, providing a guarantee for obtaining accurate test data and further improving the overall automation level and reliability of the device.

[0036] Optionally, pressure sensors are embedded in the inner sides of the jaws of the inlet three-jaw clamp 6 and the outlet three-jaw clamp 701 to monitor the clamping force in real time and feed it back to the control system.

[0037] Specifically, the pressure sensor is embedded in a specific slot inside the gripper, with its sensing surface flush with the clamping surface, ensuring that the clamping force can be directly and accurately sensed when clamping the safety valve 4. The sensor is connected to the control system via a shielded cable, converting the clamping force signal into an electrical signal in real time and transmitting it to the control unit. The control system has a built-in signal processing module that can filter, amplify, and digitize the collected data.

[0038] In this embodiment, pressure sensors are installed in the inlet and outlet three-jaw clamps 701 to monitor the clamping process of the safety valve 4. When clamping the safety valve 4, the operator can observe the force values ​​of each jaw in real time through the control system to ensure that the clamping force is evenly distributed and within the set range. This monitoring mechanism avoids sealing failure or displacement of the safety valve 4 during the test due to insufficient clamping force, and also prevents deformation of the safety valve 4 flange or damage to the sealing surface due to excessive clamping force. The data fed back by the pressure sensor can be linked with the hydraulic system to realize automatic adjustment and closed-loop control of the clamping force, ensure the reliability of clamping, improve the safety and automation level of the test process, and provide a guarantee for obtaining accurate and reliable test results.

[0039] Optionally, the sealing surface of the sealing flange 703 includes an outer metal sealing ring 9 with a stepped structure and an inner elastic sealing layer 10.

[0040] Specifically, such as Figure 3 As shown, the sealing surface of the sealing flange 703 adopts a composite structure design. The outer metal sealing ring 9 serves as the main sealing structure, and its inner diameter matches the outer diameter of the outlet end of the safety valve 4, enabling it to withstand a high sealing pressure ratio. The inner elastic sealing layer 10 serves as an auxiliary seal, and its inner diameter is slightly smaller than the inner diameter of the outlet end of the safety valve 4. Under pressure, it can generate elastic deformation to fill microscopic unevenness. The two sealing materials are firmly combined through interference fit or bonding process to form a complete stepped sealing interface.

[0041] In this embodiment, a stepped composite sealing structure is adopted to achieve double sealing of the outlet end of the safety valve 4. When the sealing flange 703 contacts the outlet end of the safety valve 4 under the push of the hydraulic cylinder 702, the outer metal sealing ring 9 first forms a rigid seal with the valve seat end face, providing the main sealing force. At the same time, the inner elastic sealing layer 10 undergoes elastic deformation under pressure, fully filling the micro gaps of the contact surface to form a secondary seal. This combined sealing design ensures the sealing reliability under high pressure conditions and can adapt to the dimensional tolerances and surface conditions of the outlet end of different specifications of safety valve 4. The metal sealing ring 9 ensures the durability and pressure resistance of the sealing structure, while the elastic sealing layer 10 provides good adaptability compensation. The two work together to improve the stability and service life of the sealing performance, prevent media leakage during the test, and ensure the accuracy of the test data and the safety of the test process.

[0042] The above description is merely a preferred embodiment of this utility model and does not constitute any limitation on this utility model. Any person skilled in the art can make many possible variations and modifications to the technical solution of this utility model, or modify it into equivalent embodiments, without departing from the scope of the technical solution of this utility model. Therefore, any modifications, equivalent changes, and alterations made to the above embodiments based on the technology of this utility model without departing from the scope of the technical solution of this utility model shall fall within the protection scope of this technical solution.

Claims

1. An integrated device for testing the set pressure and back pressure of a safety valve, characterized in that, include: The operating table (1) is equipped with an air inlet valve (2) and a pressure relief valve (3) connected to the air source. The air inlet valve (2) and the pressure relief valve (3) are connected to a safety valve (4) through pipelines to regulate and control the gas pressure in the test pipeline. Support platform (5), on which a safety valve (4) is placed; Safety valve clamping device, the safety valve clamping device is set on the support platform (5), the clamping end of the safety valve clamping device acts on the inlet end and outlet end of the safety valve (4) respectively, so as to realize the synchronous fixation of the two; The pressure path switching device has one end connected to the gas source through a pipeline, and the other end connected to the inlet and outlet of the safety valve (4) through a pipeline. By changing the connection state of the internal flow channel of the pressure path switching device, the gas source can be selectively connected to the inlet or outlet of the safety valve (4).

2. The integrated device for testing the set pressure and back pressure of a safety valve according to claim 1, characterized in that, The safety valve clamping device includes an inlet three-jaw clamp (6) and an outlet clamp assembly (7). The inlet three-jaw clamp (6) is used to clamp and seal the inlet end of the safety valve (4). The outlet clamp assembly (7) is used to clamp and seal the outlet end of the safety valve (4). A position adjustment assembly (8) is also provided on the support platform (5). The output end of the position adjustment assembly (8) is connected to the outlet clamp assembly (7). The position adjustment assembly (8) is used to adjust the relative position between the outlet clamp assembly (7) and the outlet end of the safety valve (4).

3. The integrated device for testing the set pressure and back pressure of a safety valve according to claim 2, characterized in that, The position adjustment assembly (8) includes a fixing frame (801), which is fixedly installed on the side wall of the support platform (5). A linear module (802) is installed on the fixing frame (801) to drive the outlet clamp assembly (7) to move in the vertical direction. A mounting plate (803) is fixedly installed on the surface of the linear module (802). A fixing plate (804) is fixedly installed on the mounting plate (803). A slide rail (805) is fixedly installed on the surface of the fixing plate (804). An electric slider (806) is slidably installed on the slide rail (805). A clamp support plate (807) is fixedly installed on the upper surface of the electric slider (806).

4. The integrated device for testing the set pressure and back pressure of a safety valve according to claim 3, characterized in that, The outlet clamp assembly (7) includes an outlet three-jaw clamp (701), which is fixedly mounted on the clamp support plate (807). A hydraulic cylinder (702) is also mounted on the clamp support plate (807). The output end of the hydraulic cylinder (702) passes through the outlet three-jaw clamp (701), and a sealing flange (703) is fixedly mounted on the output end of the hydraulic cylinder (702). An oil pump (704) is connected to the hydraulic cylinder (702) to provide hydraulic power. The oil pump (704) drives the output end of the hydraulic cylinder (702) to move the sealing flange (703) along the length of the hydraulic cylinder (702) to complete the sealing of the outlet end of the safety valve (4).

5. The integrated device for testing the set pressure and back pressure of a safety valve according to claim 1, characterized in that, The pressure path switching device is a three-way valve, which is connected to the gas source, the inlet of the safety valve (4) and the outlet of the safety valve (4).

6. The integrated device for testing the set pressure and back pressure of a safety valve according to claim 5, characterized in that, The three-way valve is an electromagnetically controlled valve, electrically connected to the control system, and automatically controls the switching sequence of the set pressure test and back pressure test through a preset program.

7. The integrated device for testing the set pressure and back pressure of a safety valve according to claim 4, characterized in that, Pressure sensors are embedded in the inner sides of the jaws of the inlet three-jaw clamp (6) and the outlet three-jaw clamp (701) to monitor the clamping force in real time and feed it back to the control system.

8. The integrated device for testing the set pressure and back pressure of a safety valve according to claim 4, characterized in that, The sealing surface of the sealing flange (703) includes an outer metal sealing ring (9) with a stepped structure and an inner elastic sealing layer (10).

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