A natural gas long-distance pipeline safety pressure testing device

Abstract

The utility model relates to pipeline detection technical field discloses a natural gas long -distance pipeline safety pressure testing device, including pressure testing detection box and water delivery pipe, the outside right side fixed connection of pressure testing detection box has the gas straight pipe, the inside fixed connection of gas straight pipe has sealing ring no.

Description

Technical Field

[0001] This utility model relates to the field of pipeline testing technology, and in particular to a safety pressure testing device for long-distance natural gas pipelines. Background Technology

[0002] The safety pressure testing device is a device that tests the sealing performance and pressure resistance of pipelines and containers by pressurizing, holding pressure, and monitoring pressure. The pressurization system can monitor pressure changes in real time and automatically release pressure in case of abnormalities, ensuring the safety of the pressure testing process. Natural gas long-distance pipelines transport high-pressure gas. Before commissioning, it is necessary to verify whether there are hidden dangers such as leakage and insufficient pressure resistance in the pipeline. This is closely related to the safety pressure testing device. First, the pressure testing device is connected to the pipeline in sections. Clean water or inert gas is injected into the pipeline to the specified pressure through the pressurization system. Pressure changes are monitored during the pressure holding period.

[0003] A search revealed that Chinese Publication No. CN222635969U discloses a safety pressure testing device for long-distance natural gas pipelines, relating to the field of pipeline inspection. The device includes a base plate, a side plate fixedly connected to the left side of the top of the base plate, a connecting shell fixedly connected to the right side of the side plate, an air inlet pipe connected to the left side of the connecting shell, the left side of the air inlet pipe extending to the left side of the side plate, and a pressure gauge connected to the top of the air inlet pipe. Cylinders are fixedly connected to the front and rear sides of the top right side of the base plate. A movable base is fixedly connected to the left side of the output ends of the two cylinders. A support block is fixedly connected to the top of the movable base, and a stop block is fixedly connected to the right side of the top of the movable base. This invention, by setting up a base plate, side plate, connecting shell, air inlet pipe, pressure gauge, cylinders, movable base, support block, stop block, movable plate, buffer assembly, motor, threaded rod, threaded sleeve, and connecting block, can quickly fix the pipeline to be inspected, facilitating subsequent pressure testing.

[0004] The patent specification mentioned above states that it "can quickly fix the pipeline to be tested." Natural gas long-distance pipelines have various specifications, and there may be issues such as slight misalignment of pipeline interfaces and differences in the flatness of flange sealing surfaces on site. Non-adaptive devices require custom-made fittings for each specification and deviation, and the processing and transportation of these fittings can take several days to weeks, directly slowing down the pressure testing process. To address these issues, a safety pressure testing device for natural gas long-distance pipelines is proposed. Utility Model Content

[0005] The purpose of this invention is to provide a safety pressure testing device for long-distance natural gas pipelines, which solves the problem that some existing safety pressure testing devices for long-distance natural gas pipelines cannot be installed adaptively to the pipeline.

[0006] To achieve the above objectives, this utility model provides a safety pressure testing device for long-distance natural gas pipelines, including a pressure testing box and a water pipe. A straight gas pipe is fixedly connected to the outside right side of the pressure testing box, and a sealing ring is fixedly connected inside the straight gas pipe. Both the upper and lower ends of the sealing ring are fixedly connected to self-adaptive installation mechanisms, and an anti-backflow mechanism is fixedly connected to the bottom inside the water pipe. The adaptive mounting mechanism includes a connecting frame, the connecting frame is fixedly connected to the upper and lower ends of the sealing ring, the connecting frame is rotatably connected to the inside of a rotating plate, the other end of the rotating plate is rotatably connected to a connecting frame, the bottom of the connecting frame is fixedly connected to a damping slider, the damping slider is slidably connected to a mounting plate, the mounting plate is provided with a reset component inside, and the mounting plate is fixedly connected to an arc-shaped clamping plate outside. As a further description of the above technical solution: The reset assembly includes a slide groove, the slide groove being formed on the outside of the mounting plate, a fixing rod being fixedly connected inside the slide groove, and a reset spring being sleeved on the outside of the fixing rod. As a further description of the above technical solution: The gas transmission straight pipe is fixedly connected to the front and rear sides of the pipe. The mounting bracket is rotatably connected to the inside of the mounting bracket. The left side of the rotating plate is fixedly connected to the mounting spring, and the right side of the rotating plate is fixedly connected to the mounting plate. As a further description of the above technical solution: The anti-backflow mechanism includes a cross-shaped placement plate, which is fixedly connected to the bottom of the water supply pipe. A mounting housing is fixedly connected to the top of the cross-shaped placement plate. A tension spring is fixedly connected inside the mounting housing. A limit plate is slidably connected inside the mounting housing. A sliding rod is fixedly connected to the top of the limit plate. As a further description of the above technical solution: A sealing plate is fixedly connected to the top of the sliding rod, and a second sealing ring is fixedly connected to the top of the inside of the water pipe. The outside of the sealing plate is in contact with the outside of the second sealing ring. As a further description of the above technical solution: One end of the return spring is fixedly connected to the inside of the slide groove, and the other end of the return spring is fixedly connected to the outside of the damping slider; As a further description of the above technical solution: A water storage tank is fixedly connected to the top of the pressure testing chamber, and a water pump is fixedly connected to the outside right side of the water storage tank. The outside of the water supply pipe is fixedly connected to the output end of the water pump. As a further description of the above technical solution: A gas delivery hose is fixedly connected to the outside of the gas delivery straight pipe, and the other end of the gas delivery hose is fixedly connected to the outside of the pressure test chamber.

[0007] 1. In this utility model, pressing and rotating the clamping plate separates the clamping plate one, inserting the pipe and squeezing the arc-shaped clamping plate causes the damping slider to slide and compress the reset spring. The spring rebounds and clamps pipes of different sizes. Releasing the rotating clamping plate allows the spring to rebound and fix the clamping plate once and twice. This prevents air leakage in the straight gas pipe, adapts to various pipe sizes, provides double fixation and stability, and ensures no leakage during inflation, thus improving the adaptability, stability and sealing of the pipe installation.

[0008] 2. In this utility model, the water pump is started to draw water from the water storage tank. The water flow squeezes the sealing plate, causing the sliding rod to compress the tension spring. The water then enters the pipeline through the cross placement plate. When the water pump stops, the spring rebounds after the water flow decreases, causing the sealing plate and sealing ring to fit together to prevent backflow in the water supply pipe. This ensures smooth and directional water supply, prevents backflow, keeps the water circuit clean, avoids water pollution and waste, and improves the stability and reliability of the pipeline water supply. Attached Figure Description

[0009] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the accompanying drawings used in the description of the embodiments or the prior art will be briefly introduced below.

[0010] Figure 1 This is a three-dimensional schematic diagram of a safety pressure testing device for long-distance natural gas pipelines proposed in this utility model; Figure 2 This is a schematic diagram of the water pipe structure of a safety pressure testing device for a long-distance natural gas pipeline proposed in this utility model; Figure 3 for Figure 2 Enlarged view of point A in the middle; Figure 4 for Figure 2 Enlarged view at point B in the middle; Figure 5 This is a schematic diagram of the structure of the pressure testing device for a long-distance natural gas pipeline proposed in this utility model.

[0011] In the diagram: 1. Pressure testing chamber; 2. Straight gas pipe; 3. Sealing ring one; 4. Adaptive mounting mechanism; 41. Connecting frame; 42. Rotating plate; 43. Connecting frame; 44. Damping slider; 45. Mounting plate; 46. Reset assembly; 461. Slide groove; 462. Fixing rod; 463. Reset spring; 47. Arc-shaped clamping plate; 48. Mounting frame; 49. Rotating clamping plate; 410. Clamping plate one; 411. Mounting spring; 5. Water tank; 6. Water pump; 7. Water pipe; 8. Anti-backflow mechanism; 81. Cross placement plate; 82. Mounting housing; 83. Limiting plate; 84. Tension spring; 85. Sliding rod; 86. Sealing plate; 87. Sealing ring two; 9. Gas hose. Detailed Implementation

[0012] The embodiments of the present invention are described in detail below. Examples of the embodiments are shown in the accompanying drawings. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain the present invention, but should not be construed as limiting the present invention.

[0013] Reference Figures 1 to 3 This utility model provides an embodiment of a safety pressure testing device for a long-distance natural gas pipeline, comprising a pressure testing chamber 1 and a water supply pipe 7. The water supply pipe 7 is used to transport test water into the pipeline, providing a stable water flow during the water pressure test. Its corrosion resistance ensures that it will not rust or clog due to water quality issues during long-term use. The pressure testing chamber 1 is the control center of the entire pressure testing device, capable of monitoring pressure changes within the pipeline, setting test parameters through the control panel, and controlling the start and stop of the pressure testing process. Simultaneously, its enclosed structure protects the internal precision components from external environmental influences. The external right side of the pressure testing chamber 1 is fixedly connected to... A gas supply straight pipe 2 is connected, which serves as a gas delivery channel to introduce the test gas (usually inert gas or compressed air) output from the pressure test chamber 1 into the pipeline to be tested. Its high strength characteristics ensure that it can withstand the high pressure during the pressure test and avoid leakage or bursting. A sealing ring 3 is fixedly connected inside the gas supply straight pipe 2. The sealing ring 3 is used to enhance the sealing of the connection between the gas supply straight pipe 2 and the pipeline to be tested. When the pipeline is connected, the sealing ring 3 undergoes elastic deformation under the pressure of the flange bolts, filling the connection gap and preventing the test gas from leaking from the connection, thus ensuring the accuracy of the pressure test data. Specifically, the water supply pipe 7 is corrosion resistant and provides a stable water flow to ensure water pressure testing; the pressure testing chamber 1 monitors pressure, sets parameters, controls start and stop, and protects internal components; the gas supply straight pipe 2 carries high-pressure test gas; and the sealing ring 3 fills the connection gap to prevent air leakage, ensuring accurate pressure test data and improving the overall safety and reliability of the device.

[0014] Both ends of the sealing ring 3 are fixedly connected to adaptive mounting mechanisms 4. The bottom of the water pipe 7 is fixedly connected to an anti-backflow mechanism 8, which includes a cross-shaped placement plate 81. The cross-shaped placement plate 81 provides stable support for the mounting housing 82, distributing the weight of the mounting housing 82 to the inner wall of the water pipe 7. Simultaneously, the cross-shaped structure minimizes obstruction to water flow while ensuring support strength, ensuring smooth water delivery. The outer bottom of the cross-shaped placement plate 81 is fixedly connected to the outer side of the water pipe 7, and the top of the cross-shaped placement plate 81 is fixedly connected to... There is a mounting housing 82, which provides installation and guiding space for tension spring 84, limiting plate 83 and sliding rod 85, restricting the radial movement of these components and ensuring that they can only move up and down in the axial direction, thus ensuring the accuracy of the anti-backflow action. Tension spring 84 is fixedly connected inside the mounting housing 82. Tension spring 84 keeps limiting plate 83 and sliding rod 85 moving upward through the pulling force, ensuring that sealing plate 86 fits tightly with sealing ring 87 when there is no positive water flow pressure, forming an initial seal and preventing water from flowing backward. Specifically, in the anti-backflow mechanism 8, the cross-shaped placement plate 81 firmly supports the mounting housing 82 and minimizes obstruction to water flow to ensure smooth water delivery; the mounting housing 82 guides the internal components to ensure precise axial movement; the tension spring 84 uses tension to cause the limiting plate 83 and the sliding rod 85 to drive the sealing plate 86, which fits tightly with the sealing ring 87 when there is no positive water pressure, effectively preventing water from flowing backward and ensuring the stability of water delivery.

[0015] The mounting housing 82 has an internal sliding connection to a limiting plate 83. The function of the limiting plate 83 is to transmit the tension of the tension spring 84 to the sliding rod 85, while limiting the maximum stroke of the sliding rod 85 to prevent it from completely dislodging from the mounting housing 82, thus ensuring stable operation of the mechanism. The top of the limiting plate 83 is fixedly connected to the sliding rod 85, which is a cylindrical metal rod. Its bottom end is fixed to the limiting plate 83, and its top end passes through the top opening of the mounting housing 82 and is connected to the sealing plate 86. Its exterior is slidably engaged with the guide hole of the mounting housing 82. The sliding rod 85 moves the sealing plate 86 up and down under the action of water pressure and tension spring 84, which is the transmission component to realize the backflow prevention function. The top of the sliding rod 85 is fixedly connected to the sealing plate 86, which is the core sealing component for backflow prevention. Under the tension of tension spring 84, it fits tightly with the sealing ring 87 to block the reverse water flow. When the forward water pressure is greater than the spring tension, the sealing plate 86 moves down, opens the channel and allows water to flow forward. The top of the inside of the water pipe 7 is fixedly connected to the sealing ring 87. The sealing ring 87 and the sealing ring of the sealing plate 86 form a double sealing structure to enhance the backflow prevention effect. Even under low pressure, it can effectively prevent water from flowing backward. Its aging resistance ensures stable performance in long-term use. The outside of the sealing plate 86 fits tightly with the outside of the sealing ring 87. Specifically, the limiting plate 83 transmits tension spring 84 to the sliding rod 85, and also limits the stroke of the sliding rod 85 to prevent it from coming off. The sliding rod 85 moves up and down with the sealing plate 86. When there is no positive water pressure, the sealing plate 86 and the sealing ring 87 fit together to prevent backflow. When the water pressure is sufficient, it moves down to allow water to pass through. The double sealing enhances the backflow prevention effect. The sealing ring 87 is resistant to aging, ensuring stable operation of the mechanism and unidirectional water delivery.

[0016] Reference Figures 2 to 4 The adaptive installation mechanism 4 includes a connecting frame 41, which serves as the installation foundation for the entire adaptive mechanism. The connecting frame 41 provides a stable rotation fulcrum for the rotating plate 42, transferring the force of the mechanism to the sealing ring 3. This ensures that the sealing ring 3 can synchronously adhere to the outer wall of the pipe during clamping, preventing uneven local force that could lead to seal failure. The connecting frame 41 is externally fixedly connected to the upper and lower ends of the sealing ring 3. The rotating plate 42 is rotatably connected inside the connecting frame 41. The rotating plate 42 adjusts its angle to drive the connecting frame 43 and the arc-shaped clamping plate 47 to adapt to pipes of different outer diameters—when the pipe outer diameter is large, the rotating plate 42 swings outward; when the outer diameter is small, it retracts inward. The other end of the rotating plate 42 is rotatably connected to the connecting frame 43, which connects the rotating plate 42 to the damping slider. The function of 44 is to convert the swing of the rotating plate 42 into the sliding of the damping slider 44 along the slide groove 461. The bottom of the connecting frame 43 is fixedly connected to the damping slider 44. The damping slider 44 can slide smoothly along the slide groove 461 to adjust the contact position between the arc-shaped clamping plate 47 and the pipe. Its built-in damping structure can provide moderate resistance, so that the slider can maintain a fixed position when there is no external force, and avoid the clamping loosened due to vibration during the pressure test. The damping slider 44 is externally slidably connected to the mounting plate 45. The mounting plate 45 serves as the mounting carrier of the arc-shaped clamping plate 47. It achieves fine-tuning of position through cooperation with the damping slider 44. At the same time, its arc structure can increase the contact area with the pipe, improve the clamping stability, and avoid excessive local pressure from damaging the outer wall of the pipe. The mounting plate 45 is internally equipped with a reset component 46. Specifically, in the adaptive installation mechanism 4, the connecting frame 41 stabilizes the components and transmits force to ensure the sealing ring 3 fits; the rotating plate 42 can adjust the angle to adapt to pipes of different outer diameters; the connecting frame 43 converts the swing into the sliding of the damping slider 44, and the slider damping structure prevents vibration and loosening; the mounting plate 45 increases the contact area with the pipe and avoids damage, thus improving the overall pipe clamping adaptability, stability and sealing reliability.

[0017] The reset assembly 46 includes a slide groove 461, which provides a sliding track for the damping slider 44, limiting its movement direction (sliding only along the tangent of the arc of the mounting plate 45), and protecting the internal fixing rod 462 and reset spring 463 from external impurities. The slide groove 461 is externally located on the mounting plate 45, and the fixing rod 462 is fixedly connected inside the slide groove 461. The fixing rod 462 passes through the through hole in the center of the damping slider 44, guiding the sliding of the damping slider 44 and preventing the slider from deviating or tilting during movement. It also provides mounting support for the reset spring 463, preventing the spring from bending laterally when it extends or retracts. The reset spring 463 is sleeved on the outside of the fixing rod 462. The reset spring 463 pushes the damping slider 44 towards the center of the slide groove 461 through its elastic force, so that the arc-shaped clamping plate 47 can automatically tighten when it contacts the pipe. The clamping range is adjusted according to the outer diameter of the pipe—the larger the outer diameter of the pipe, the greater the spring compression and the stronger the clamping force; conversely, the clamping force decreases adaptively. An arc-shaped clamping plate 47 is fixedly connected to the outside of the mounting plate 45. The arc-shaped clamping plate 47 directly contacts the outer wall of the pipe to be tested. The rubber pad can increase the friction with the pipe, improve the clamping stability, and avoid direct metal contact that could scratch the anti-corrosion layer of the pipe. Its arc-shaped structure can adapt to the circular contour of the pipe to ensure a tight fit. The auxiliary sealing ring 3 enhances the sealing effect. Mounting brackets 48 are fixedly connected to the front and rear sides of the gas straight pipe 2. The mounting brackets 48 provide a rotating mounting base for the rotating clamping plate 49 and transfer the force of the rotating clamping plate 49 to the gas straight pipe 2 to ensure the stability of the external clamping structure. It works with the internal adaptive mechanism to form "double fixing inside and outside". The rotating clamping plate 49 is rotatably connected inside the mounting bracket 48. Specifically, in the reset assembly 46, the slide groove 461 guides the sliding damping slider 44 and protects the component, the fixed rod 462 prevents the slider from deviating and supports the reset spring 463, the spring pushes the slider so that the arc-shaped clamping plate 47 adapts to the outer diameter of the pipe, the rubber pad increases friction and avoids scratches, and the mounting bracket 48 cooperates with the rotating clamping plate 49 to form double fixation inside and outside, improving clamping stability and sealing effect.

[0018] The rotating clamp 49 locks the pipe flange with the clamp 410 on its right end, achieving external locking between the gas straight pipe 2 and the pipe to be tested, preventing the pipe connection from falling off due to excessive pressure during pressure testing. A mounting spring 411 is fixedly connected to the outer left side of the rotating clamp 49. The mounting spring 411 keeps the right end of the rotating clamp 49 pressed downward through tension, ensuring that the clamp 410 is tightly locked on the pipe flange, forming a continuous locking force. When disassembly is required, simply pull the left end of the rotating clamp 49 upward to compress the spring and release the lock. The operation is convenient. A clamp 410 is fixedly connected to the outer right side of the rotating clamp 49. The right-angled side of the clamp 410 can fit tightly with the outer edge of the flange of the pipe to be tested, forming a mechanical lock and preventing the pipe from detaching from the gas straight pipe 2 axially. Specifically, the rotating clamping plate 49 clamps the pipe flange with clamping plate 410 to prevent the pipe connection from falling off during pressure testing; the installed spring 411 pulls the rotating clamping plate 49 so that clamping plate 410 continuously presses the flange. When disassembling, simply move the left end of the clamping plate. The operation is convenient. The right-angled edge of clamping plate 410 fits the flange, preventing the pipe from axially disengaging and improving the reliability of the connection and locking and the convenience of operation.

[0019] Reference Figures 4 to 5 One end of the return spring 463 is fixedly connected to the inside of the slide groove 461, and the other end of the return spring 463 is fixedly connected to the outside of the damping slider 44. A water storage tank 5 is fixedly connected to the top of the pressure test chamber 1. The water storage tank 5 provides a stable water source for the water pressure test, avoiding interruption of the test due to insufficient water during the test. The level gauge can display the remaining water in real time, making it convenient for operators to add water in time. A water pump 6 is fixedly connected to the right side of the outside of the water storage tank 5. The water pump 6 serves as the power source for the water pressure test, pressurizing the water in the water storage tank 5 and then transporting it to the pipeline to be tested through the water pipe 7. The output water pressure can be controlled by adjusting the power of the water pump 6 to meet the test requirements of different pressure levels and ensure accurate and stable test pressure. The water supply pipe 7 is externally fixedly connected to the output end of the water pump 6. The gas supply straight pipe 2 is externally fixedly connected to the gas supply hose 9. The gas supply hose 9 is used to deliver the test gas output from the pressure test chamber 1 to the gas supply straight pipe 2. Its flexible characteristics can absorb the displacement caused by pipe vibration and avoid the pipe stress concentration caused by rigid connection. At the same time, it is convenient to connect and install the gas supply straight pipe 2 with the pipe to be tested. The other end of the gas supply hose 9 is fixedly connected to the outside of the pressure test chamber 1. Specifically, the reset spring 463 connects the slide groove 461 and the damping slider 44 to assist the arc-shaped clamping plate 47 in adaptive clamping; the water tank 5 provides stable water supply and displays the liquid level to prevent test interruption; the water pump 6 pressurizes and delivers water and is adjustable to meet different pressure test requirements; the air supply hose 9 absorbs vibration and is easy to connect, avoiding stress concentration, and overall ensuring the stability and convenience of the pressure test.

[0020] Working principle: When installing the pipeline, pressing the rotating clamp 49 causes it to compress the mounting spring 411, which in turn causes the clamp 49 to separate the clamp 410. By inserting the pipeline into the gas straight pipe 2, the pipeline compresses the arc-shaped clamp 47, which in turn causes the damping slider 44 to slide inside the mounting plate 45. The damping slider 44 then compresses the return spring 463 outside the fixing rod 462, causing the rotating plate 42 to rotate. The force of the return spring 463 then clamps pipelines of different sizes. At this point, releasing the rotating clamp 49 causes the mounting spring 411 to rebound, which in turn allows the clamp 410 to fix the pipeline a second time. Because of the gas straight pipe 2, there will be no leakage when the pipeline is filled with gas. By starting the water pump 6, the water pump 6 draws water from the inside of the water storage tank 5 through the water supply pipe 7, causing the water flow to squeeze the sealing plate 86. The sealing plate 86 then squeezes the tension spring 84 inside the mounting housing 82 through the sliding rod 85, causing the water flow to enter the inside of the pipe through the cross placement plate 81. When the water pump 6 is turned off, the water flow decreases, causing the tension spring 84 to rebound. This allows the sliding rod 85 to fit against the sealing ring 87 through the sealing plate 86, thereby preventing backflow in the water supply pipe 7.

[0021] The above-disclosed embodiments are merely one or more preferred embodiments of this application and should not be construed as limiting the scope of this application. Those skilled in the art can understand that all or part of the processes for implementing the above embodiments and equivalent changes made in accordance with the claims of this application still fall within the scope of this application.

Claims

1. A safety pressure testing device for long-distance natural gas pipelines, comprising a pressure testing chamber and a water pipeline, characterized in that: A straight gas supply pipe is fixedly connected to the outside right side of the pressure test chamber. A sealing ring is fixedly connected inside the straight gas supply pipe. An adaptive installation mechanism is fixedly connected to both the upper and lower ends of the sealing ring. An anti-backflow mechanism is fixedly connected to the bottom of the inside of the water supply pipe. The adaptive mounting mechanism includes a connecting frame, which is externally fixedly connected to the upper and lower ends of the sealing ring. A rotating plate is rotatably connected inside the connecting frame, and a connecting frame is rotatably connected to the other end of the rotating plate. A damping slider is fixedly connected to the bottom of the connecting frame, and a mounting plate is slidably connected to the outside of the damping slider. A reset component is provided inside the mounting plate, and an arc-shaped clamping plate is fixedly connected to the outside of the mounting plate.

2. The safety pressure testing device for long-distance natural gas pipelines according to claim 1, characterized in that: The reset assembly includes a slide groove, which is formed on the outside of the mounting plate. A fixing rod is fixedly connected inside the slide groove, and a reset spring is sleeved on the outside of the fixing rod.

3. The safety pressure testing device for long-distance natural gas pipelines according to claim 2, characterized in that: The gas transmission straight pipe is fixedly connected to mounting brackets on both the front and rear sides. A rotating clamping plate is rotatably connected inside the mounting bracket. A mounting spring is fixedly connected to the left side of the rotating clamping plate, and a clamping plate is fixedly connected to the right side of the rotating clamping plate.

4. The safety pressure testing device for long-distance natural gas pipelines according to claim 1, characterized in that: The anti-backflow mechanism includes a cross-shaped placement plate, which is externally and fixedly connected to the bottom of the water supply pipe. A mounting housing is fixedly connected to the top of the cross-shaped placement plate, and a tension spring is fixedly connected inside the mounting housing. A limit plate is slidably connected inside the mounting housing, and a sliding rod is fixedly connected to the top of the limit plate.

5. A safety pressure testing device for long-distance natural gas pipelines according to claim 4, characterized in that: A sealing plate is fixedly connected to the top of the sliding rod, and a second sealing ring is fixedly connected to the top of the inside of the water pipe. The outside of the sealing plate is in contact with the outside of the second sealing ring.

6. The safety pressure testing device for long-distance natural gas pipelines according to claim 2, characterized in that: One end of the return spring is fixedly connected to the inside of the slide groove, and the other end of the return spring is fixedly connected to the outside of the damping slider.

7. The safety pressure testing device for long-distance natural gas pipelines according to claim 1, characterized in that: A water storage tank is fixedly connected to the top of the pressure testing chamber, and a water pump is fixedly connected to the outside right side of the water storage tank. The water supply pipe is fixedly connected to the output end of the water pump.

8. A safety pressure testing device for long-distance natural gas pipelines according to claim 1, characterized in that: A gas delivery hose is fixedly connected to the outside of the gas delivery straight pipe, and the other end of the gas delivery hose is fixedly connected to the outside of the pressure test chamber.

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