A device for extracting a pressure retaining valve plug

Abstract

This invention discloses a device for pulling out a pressure-holding valve plug, characterized by comprising: a pull-out cylinder for the operator to apply force; a guide member disposed on the pull-out cylinder for positioning in conjunction with the pressure-holding valve body to ensure that the axis of the pull-out cylinder is aligned with the axis of the plug on the pressure-holding valve; a clamping assembly including two opposing clamping arms rotatably connected to the pull-out cylinder via a fulcrum to form a lever structure, the fulcrum dividing the clamping arms into a clamping portion and a release portion; the clamping portion being disposed within the pull-out cylinder and having hook portions for hooking onto the mating parts of the plug, the release portion being exposed outside the pull-out cylinder; and a locking and retaining mechanism disposed between the pull-out cylinder and the release portion for applying an elastic bias force to the clamping arms, causing the two hook portions to maintain a clamping tendency towards each other when the release portion is not under force. The advantages are that it ensures vertical pull-out force and is easy to operate.

Description

Technical Field

[0001] This invention relates to the field of pressure-holding valve repair and assembly technology, and in particular to a device for removing the plug of a pressure-holding valve. Background Technology

[0002] In industrial production and equipment maintenance, pressure holding valves are common fluid control components. During factory shipping and storage, their inlet and outlet are typically fitted with plastic or metal plugs to prevent foreign objects from entering the valve body, thus protecting the internal precision valve core and seals (such as O-rings). These plugs must be removed before the pressure holding valve is installed or subjected to functional testing.

[0003] Currently, the industry commonly uses manual methods, such as pulling out the plug by hand or with simple tools (like pliers). This method has significant drawbacks: (1) The operation is highly random and easily damages the seals: When manually pulled out, it is difficult to ensure that the direction of the applied pulling force is completely consistent with the axis of the plug. Any lateral force may cause the plug and the valve body sealing surface to wear unevenly, which can easily scratch or squeeze the O-ring or other seals at the valve body port, causing potential leakage hazards. This kind of damage is random and difficult to control. (2) Low efficiency: For batch operations, manual operation is inefficient, and repeated forceful removal can easily lead to operator fatigue. Summary of the Invention

[0004] The technical problem to be solved by the present invention is to provide a device for pulling out a pressure-holding valve plug that can ensure vertical pull-out force and is easy to operate.

[0005] The technical solution adopted by the present invention to solve the above-mentioned technical problems is as follows: A device for removing a pressure-holding valve plug, comprising: Pull out the cylinder to allow the operator to apply force; the end from which the cylinder is pulled out is the open end. A guide component, set on the pull-out cylinder, is used to cooperate with the valve body of the pressure holding valve for positioning, so that the pull-out cylinder is coaxial with the plug on the pressure holding valve; The clamping assembly includes two opposing clamping arms, which are rotatably connected to the pull-out cylinder via a fulcrum to form a lever structure. The fulcrum divides the clamping arms into a clamping part and a releasing part. The clamping part is located inside the pull-out cylinder and has a hook for hooking onto the mating part of the plug. The releasing part is exposed outside the pull-out cylinder. There is a clearance space between the outer wall of the clamping part and the inner wall of the pull-out cylinder for the clamping part to open outward. A locking and retaining mechanism is provided between the pull-out cylinder and the release part. It is used to apply an elastic bias force to the clamping arm so that the two hooks maintain a clamping tendency to move closer to each other when the release part is not under force. In use, the guide member is positioned in conjunction with the valve body of the pressure-holding valve, making the pull-out cylinder coaxial with the plug. The plug extends into the pull-out cylinder through the open end, and the hook part hooks onto the mating part of the plug. After hooking, the pull-out cylinder is pulled outward, and the plug is pulled out along its axis by the hook part. After the plug is pulled out, the two release parts are pressed inward simultaneously. The two release parts move closer to each other, and the two clamping parts move away from each other, so that the hook part disengages from the mating part of the plug.

[0006] The guide component is a guide cylinder, which is disposed inside the pull-out cylinder. The guide cylinder has an inner hole that matches the outer contour of the corresponding position of the pressure holding valve body. In use, the guide cylinder is sleeved on the corresponding position of the pressure holding valve body through the inner hole to achieve coaxial positioning of the pull-out cylinder and the plug.

[0007] The locking and retaining mechanism includes a positioning member and an elastic pushing member. The positioning member is disposed inside the pull-out cylinder, and the elastic pushing member is disposed between the release part and the positioning member. The elastic pushing member applies an elastic bias force to the release part, so that the two hook parts maintain a clamping tendency to move closer to each other when the release part is not under force.

[0008] The positioning element is a positioning sleeve, and the elastic pushing element is a spring post. The positioning sleeve has a recessed hole, and the release part has a corresponding recessed cavity. The two ends of the spring post extend into the recessed hole and the recessed cavity respectively. The spring post applies an elastic biasing force to the release part so that the spring post pushes against the release part.

[0009] The guide cylinder is movably disposed within the pull-out cylinder along the axial direction, and the pull-out device further includes an adjustment mechanism for adjusting the axial position of the guide cylinder relative to the pull-out cylinder.

[0010] The adjustment mechanism includes an adjustment rod, an adjustment screw, a limit block, and a lower elastic element; The adjusting rod is axially disposed inside the pull-out cylinder, and a protruding ring is provided on the adjusting rod; The positioning sleeve is provided with a limiting ring, the lower end of the adjusting rod passes through the limiting ring and is fixedly connected to the upper end of the guide cylinder, and the lower elastic element is sleeved on the adjusting rod and is disposed between the convex ring and the limiting ring. The adjusting screw is axially movable through the pull-out cylinder, with its head extending out of the pull-out cylinder and its lower part extending into the pull-out cylinder and positioned above the adjusting rod for pushing the adjusting rod downwards. The limiting block is screwed onto the adjusting screw and is located inside the pull-out cylinder for limiting the upward movement of the adjusting screw relative to the pull-out cylinder to its extreme position.

[0011] An adjusting nut is screwed onto the upper part of the adjusting screw, and the adjusting nut is located outside the pull-out cylinder. The limiting block is axially movable inside the pull-out cylinder, and an upper elastic element is provided between the limiting block and the convex ring. The upper elastic element is sleeved on the adjusting rod. By rotating the adjusting nut, the adjusting screw is driven to move axially with the limiting block to adjust the preload of the upper elastic element.

[0012] The side of the pull-out cylinder is provided with a threaded hole that passes through the inside and outside of the pull-out cylinder, corresponding to the position of the limiting block. A set screw is screwed into the threaded hole, and the inner end of the set screw abuts against the limiting block to lock and fix the position of the limiting block.

[0013] The clamping part is disposed inside the guide cylinder, and the guide cylinder has an opening that extends through the inside and outside corresponding to the position of the clamping part, so that the clamping part can pass through when the clamping parts are far apart.

[0014] The fulcrum is a pivot, and the clamping arm is rotatably mounted on the pull-out cylinder via the pivot.

[0015] The guide cylinder is detachably installed inside the pull-out cylinder.

[0016] The bottom of the hook portion is provided with an inlet ramp. When the pull-out device is inserted into the plug direction, the inlet ramp abuts against the edge of the plug and generates a radial force that forces the two clamping portions to move away from each other, so that the hook portion slides in and hooks onto the mating part.

[0017] Compared with the prior art, the advantages of the present invention are as follows: (1) Eliminate lateral force and effectively protect the seals: By positioning the guide component in conjunction with the valve body of the pressure holding valve, the axis of the pull-out cylinder is always aligned with the axis of the plug, ensuring that the pull-out force acts perpendicularly to the axial direction of the plug, thereby fundamentally eliminating the lateral force, avoiding uneven wear between the plug and the valve body sealing surface, effectively protecting the O-ring and other seals at the valve body port, and eliminating the risk of leakage caused by damage to the seals; (2) Simple operation and high efficiency: Through the cooperation of the lever structure of the clamping arm and the locking and retaining mechanism, the operator only needs to put the device into the pressure holding valve and pull the cylinder upward to complete the vertical removal of the plug; after pulling out, press the two release parts at the same time, and the clamping parts of the clamping arm will move away from each other under the action of the lever, and the hook will automatically disengage from the mating part of the plug, realizing rapid release, simplifying the operation steps and reducing labor intensity; (3) Compact structure and low requirements for operating space: The core components such as clamping part and locking mechanism are integrated and set inside the pull-out cylinder. The overall structure is compact and small in size. It can still be used normally under working conditions with limited operating space and has good environmental adaptability. Attached Figure Description

[0018] Figure 1 This is a three-dimensional structural diagram of the present invention; Figure 2 This is a cross-sectional view of the present invention in the unstressed state of the released portion; Figure 3 This is a cross-sectional view of one of the pressure-holding valves used in the present invention. Figure 4 for Figure 3 Enlarged structural diagram at point B; Figure 5 for Figure 3 A three-dimensional structural diagram of the corresponding pressure-holding valve; Figure 6 This is a cross-sectional view of the present invention in the released state. Detailed Implementation

[0019] The present invention will be further described in detail below with reference to the accompanying drawings and embodiments.

[0020] like Figures 1 to 6 As shown, a device for removing a pressure-holding valve plug includes: Pull out cylinder 1 for the operator to apply force; one end of cylinder 1 is an open end. Guide component 2 is provided on the pull-out cylinder 1 and is used to cooperate with the valve body of the pressure holding valve A for positioning so that the pull-out cylinder 1 is coaxial with the plug A1 on the pressure holding valve A; The clamping assembly includes two opposing clamping arms 3, which are rotatably connected to the pull-out cylinder 1 via a fulcrum to form a lever structure. The fulcrum divides the clamping arms 3 into a clamping part 31 and a releasing part 32. The clamping part 31 is disposed inside the pull-out cylinder 1 and is provided with a hook part 311 for hooking onto the mating part A11 on the plug A1. The releasing part 32 is exposed outside the pull-out cylinder 1. A locking and retaining mechanism is provided between the pull-out cylinder 1 and the release part 32. It is used to apply an elastic bias force to the clamping arm 3 so that the two hook parts 311 maintain a clamping tendency to move closer to each other when the release part 32 is not under force. In use, the guide member 2 is positioned in conjunction with the valve body of the pressure holding valve A, so that the pull-out cylinder 1 and the plug A1 are coaxial. The plug A1 extends into the pull-out cylinder 1 through the open end of the pull-out cylinder 1, and the hook part 311 hooks onto the mating part A11 of the plug A1. After hooking, the pull-out cylinder 1 is pulled outward, and the plug A1 is pulled out along its axial direction by the hook part 311. After the plug A1 is pulled out, the two release parts 32 are pressed inward at the same time. The two release parts 32 move closer to each other, and the two clamping parts 31 move away from each other, so that the hook part 311 disengages from the mating part A11 of the plug A1.

[0021] In this specific embodiment, the guide member 2 is a guide cylinder, which is disposed inside the pull-out cylinder 1. The guide cylinder has an inner hole 21 that matches the outer contour of the corresponding position A2 of the pressure-holding valve A. In use, the guide cylinder is sleeved on the corresponding position A2 of the pressure-holding valve A through the inner hole 21 to achieve coaxial positioning of the pull-out cylinder 1 and the plug A1. Through the sleeve fit between the guide cylinder and the outer wall of the pressure-holding valve A, the device and the plug A1 are quickly and accurately positioned coaxially, ensuring that the direction of the pull-out force is completely consistent with the axis of the plug A1, eliminating lateral force at the source and avoiding the risk of damaging the O-ring due to skewed pull-out.

[0022] In this specific embodiment, the corresponding position A2 can be the hexagonal wrench part (i.e., the outer hexagonal surface) on the valve body of the pressure holding valve A.

[0023] In this specific embodiment, in the clamping state, there is a clearance space 10 between the outer wall of the clamping part 31 and the inner wall of the pull-out cylinder 1, allowing the clamping part 31 to open outward. The clearance space 10 ensures that the clamping part 31 can swing freely outward under the action of leverage, so that the hook part 311 can smoothly disengage from the mating part A11 of the plug A1, ensuring the reliability of the release action.

[0024] In this specific embodiment, the locking and retaining mechanism includes a positioning member 4 and an elastic pushing member 5. The positioning member 4 is disposed inside the pull-out cylinder 1, and the elastic pushing member 5 is disposed between the release part 32 and the positioning member 4. The elastic pushing member 5 applies an elastic biasing force to the release part 32, so that the two hook parts 311 maintain a clamping tendency towards each other when the release part 32 is not under force. Through the positioning member 4 and the elastic pushing member 5, automatic elastic pushing of the release part 32 is realized, so that the two hook parts 311 always maintain a clamping tendency when the release part 32 is not under force. The plug A1 can be automatically locked without additional operation by the operator, simplifying the operation steps.

[0025] In this specific embodiment, the positioning element 4 is a positioning sleeve fixedly installed inside the pull-out cylinder 1, and the elastic pushing element 5 is a spring post. The positioning sleeve has a recessed hole 41, and the release part 32 has a corresponding recessed cavity 321. The two ends of the spring post extend into the opposite recessed hole 41 and recessed cavity 321, respectively. The spring post applies an elastic bias force to the release part 32, causing the spring post to push against the release part 32. Through the specific cooperation structure of the positioning sleeve and the spring post, precise elastic pushing against the release part 32 is achieved. The structure is simple and compact, the force transmission path is clear, and the stability and reliability of the clamping trend are guaranteed. At the same time, the parts are easy to process and assemble, and the manufacturing cost is low.

[0026] In this specific embodiment, the guide cylinder is axially movable within the pull-out cylinder 1. The pull-out device also includes an adjustment mechanism for adjusting the axial position of the guide cylinder relative to the pull-out cylinder 1. The adjustment mechanism enables precise adjustment of the axial position of the guide cylinder, allowing the device to quickly adapt to pressure-holding valves A with different port heights. One set of devices can meet various specifications, eliminating the need for separate dedicated tools for each model and significantly reducing tooling procurement and management costs.

[0027] In this specific embodiment, the adjustment mechanism includes an adjustment rod 7, an adjustment screw 8, a limiting block 9, and a lower elastic member 61; The adjusting rod 7 is axially arranged inside the pull-out cylinder 1, and a protruding ring 71 is provided on the adjusting rod 7. A limiting ring 42 is provided inside the positioning sleeve. The lower end of the adjusting rod 7 passes through the limiting ring 42 and is fixedly connected to the upper end of the guide cylinder. The lower elastic element 61 is sleeved on the adjusting rod 7 and is located between the convex ring 71 and the limiting ring 42. An adjusting screw 8 is axially movable through the pull-out cylinder 1. The head 81 of the adjusting screw 8 extends out of the pull-out cylinder 1, while the lower part of the adjusting screw 8 extends into the pull-out cylinder 1 and is positioned above the adjusting rod 7, used to push the adjusting rod 7 downwards. A limiting block 9 is screwed onto the adjusting screw 8 and is located inside the pull-out cylinder 1, used to limit the upward movement of the adjusting screw 8 relative to the pull-out cylinder 1. Through the screwed engagement of the limiting block 9 and the adjusting screw 8, the axial anti-disengagement limiting of the adjusting screw 8 within the pull-out cylinder 1 is achieved, resulting in a simple and reliable structure. The lower elastic element 61 provides a restoring force, ensuring that the adjusting rod 7 remains stable after adjustment, preventing accidental movement of the guide cylinder during operation. The head 81 of the adjusting screw 8 extends out of the pull-out cylinder 1, allowing the operator to quickly adjust the height of the guide cylinder by directly rotating the adjusting screw 8, making operation convenient and efficient.

[0028] In this specific embodiment, an adjusting nut 80 is screwed onto the upper part of the adjusting screw 8, and the adjusting nut 80 is located outside the pull-out cylinder 1; the limiting block 9 is axially movable inside the pull-out cylinder 1, and an upper elastic element 62 is provided between the limiting block 9 and the convex ring 71. The upper elastic element 62 is sleeved on the adjusting rod 7. By rotating the adjusting nut 80, the adjusting screw 8 is driven to move axially with the limiting block 9 to adjust the preload of the upper elastic element 62. Rotating the adjusting nut 80 drives the adjusting screw 8 to move axially along with the limiting block 9, providing a large operating space and good visibility. The threaded drive allows for precise fine-tuning of the preload. The upper elastic element 62 and the lower elastic element 61 apply opposite elastic forces to the convex ring 71, ensuring that the adjusting rod 7 maintains a balanced force even when the release part 32 is unloaded, thus improving adjustment accuracy and positional stability. Adjusting the preload of the upper elastic element 62 allows the device to adapt to the pull-out force required for different sizes of plugs, making it highly versatile. Rotating the adjusting nut 80 simultaneously adjusts the guide cylinder position and the preload of the upper elastic element 62, making operation simple and efficient.

[0029] In this specific embodiment, a threaded hole 100 is provided on the side of the pull-out cylinder 1 at the position corresponding to the limiting block 9, which passes through the inside and outside of the pull-out cylinder 1. A set screw 101 is screwed into the threaded hole 100, and the inner end of the set screw 101 abuts against the limiting block 9 to lock and fix the position of the limiting block 9. By engaging the set screw 101 with the screw hole 100, the limit block 9 can be locked and fixed after adjustment by tightening the set screw 101, preventing the position of the limit block 9 from changing due to vibration or impact during operation and ensuring the long-term stability of the adjusted position. The set screw 101 can be operated from outside the cylinder 1, and locking and unlocking can be achieved without disassembling the device. The adjustment and locking operations are separated, making it flexible and convenient to use. The inner end of the set screw 101 directly abuts against the limit block 9, providing direct and reliable locking force. The structure is simple and the cost is low. After unlocking the set screw 101, the preload of the upper elastic element 62 can be readjusted, allowing the device to quickly adapt to pressure-holding valves of different specifications, improving versatility and maintainability.

[0030] In this specific embodiment, both the upper elastic element 62 and the lower elastic element 61 are springs.

[0031] In this specific embodiment, the head 81 of the adjusting screw 8 is provided with an internal hexagonal hole 82 so as to facilitate the rotation of the screw using an internal hexagonal wrench.

[0032] In this specific embodiment, the clamping part 31 is disposed inside the guide cylinder. The guide cylinder has an opening 22, with both inner and outer openings, corresponding to the position of the clamping part 31, allowing the clamping part 31 to pass through when they move away from each other. The clamping part 31's placement inside the guide cylinder fully utilizes the internal space, resulting in a more compact overall structure and a shorter axial dimension. The opening 22 on the guide cylinder provides a clearance passage for the opening of the clamping part 31, ensuring smooth and unobstructed clamping and releasing actions.

[0033] In this specific embodiment, the length of the opening 22 along the axial direction of the guide cylinder should be greater than or equal to the maximum adjustment stroke of the guide cylinder, so as to ensure that the clamping part 31 can swing freely outward through the opening 22 in any adjustment position.

[0034] In this specific embodiment, the fulcrum is the pivot 30, and the clamping arm 3 is rotatably mounted on the pull-out cylinder 1 via the pivot 30. The pivot 30 enables the rotatable connection between the clamping arm 3 and the pull-out cylinder 1, resulting in a simple and reliable structure with flexible rotation, ensuring the stable transmission of the lever action. Furthermore, the pivot 30 is a standard part, making it easy to procure and replace, further reducing manufacturing costs and maintenance difficulty.

[0035] In this specific embodiment, the bottom of the hook portion 311 is provided with an inlet ramp 3111. When the pull-out device is inserted towards the plug A1, the inlet ramp 3111 first contacts the end edge of the plug A1. As pressure is applied, the edge of the plug A1 generates a radial force on the inlet ramp 3111, forcing the two clamping portions 31 to overcome the elastic force of the elastic pusher 5 and open outward until the hook portion 311 slides into the concave ring of the plug A1. At this time, it resets under the action of the elastic pusher 5, realizing automatic hooking. This ramp inlet structure allows the operator to lock the device simply by inserting it without manually prying open the clamping arm, further improving the convenience of operation.

[0036] In this specific embodiment, the hook portion 311 is a latch, and the mating portion A11 on the plug A1 is a concave ring provided on the outer wall of the plug A1. The shape of the latch is adapted to the cross-sectional shape of the concave ring. The cross-sectional shape of the concave ring can be arc-shaped or trapezoidal to facilitate the sliding in and out of the latch, while ensuring sufficient axial holding force.

[0037] In this specific embodiment, the inner wall of the hook is provided with anti-slip texture or elastic pad (not shown in the figure) to enhance the reliability of the hook engagement with the concave ring and prevent accidental disengagement due to vibration or impact during the pull-out process.

[0038] In this specific embodiment, the outer wall of the pull-out cylinder 1 is provided with an anti-slip structure (not shown in the figure, such as knurling or rubber sleeve) to facilitate the operator's grip and application of force.

[0039] In this specific embodiment, the guide cylinder is detachably installed inside the pull-out cylinder 1, and the guide cylinder and the adjusting rod 7 are detachably fixedly connected. Depending on the outer diameter of the valve body of different models of pressure holding valve A, the guide cylinder with the corresponding inner hole diameter 21 can be replaced to expand the versatility of the device.

Claims

1. A device for removing a plug from a pressure-holding valve, characterized in that... include: Pull out the cylinder to allow the operator to apply force; the end from which the cylinder is pulled out is the open end. A guide component, set on the pull-out cylinder, is used to cooperate with the valve body of the pressure holding valve for positioning, so that the pull-out cylinder is coaxial with the plug on the pressure holding valve; The clamping assembly includes two opposing clamping arms, which are rotatably connected to the pull-out cylinder via a fulcrum to form a lever structure. The fulcrum divides the clamping arms into a clamping part and a releasing part. The clamping part is located inside the pull-out cylinder and has a hook for hooking onto the mating part of the plug. The releasing part is exposed outside the pull-out cylinder. There is a clearance space between the outer wall of the clamping part and the inner wall of the pull-out cylinder for the clamping part to open outward. A locking and retaining mechanism is provided between the pull-out cylinder and the release part. It is used to apply an elastic bias force to the clamping arm so that the two hooks maintain a clamping tendency to move closer to each other when the release part is not under force. In use, the guide member is positioned in conjunction with the valve body of the pressure-holding valve, making the pull-out cylinder coaxial with the plug. The plug extends into the pull-out cylinder through the open end, and the hook part hooks onto the mating part of the plug. After hooking, the pull-out cylinder is pulled outward, and the plug is pulled out along its axis by the hook part. After the plug is pulled out, the two release parts are pressed inward simultaneously. The two release parts move closer to each other, and the two clamping parts move away from each other, so that the hook part disengages from the mating part of the plug. The guide component is a guide cylinder, which is disposed inside the pull-out cylinder. The guide cylinder has an inner hole that matches the outer contour of the corresponding position of the pressure holding valve body. In use, the guide cylinder is sleeved on the corresponding position of the pressure holding valve body through the inner hole to achieve coaxial positioning of the pull-out cylinder and the plug. The guide cylinder is movably disposed in the pull-out cylinder along the axial direction, and the pull-out device further includes an adjustment mechanism for adjusting the axial position of the guide cylinder relative to the pull-out cylinder. The adjustment mechanism includes an adjustment rod, an adjustment screw, a limit block, and a lower elastic element; The adjusting rod is axially disposed inside the pull-out cylinder, and a protruding ring is provided on the adjusting rod; The locking and retaining mechanism includes a positioning element, which is a positioning sleeve. A limit ring is provided inside the positioning sleeve. The lower end of the adjusting rod passes through the limit ring and is fixedly connected to the upper end of the guide cylinder. The lower elastic element is sleeved on the adjusting rod and is disposed between the convex ring and the limit ring. The adjusting screw is axially movable through the pull-out cylinder, with its head extending out of the pull-out cylinder and its lower part extending into the pull-out cylinder and positioned above the adjusting rod for pushing the adjusting rod downwards. The limiting block is screwed onto the adjusting screw and is located inside the pull-out cylinder for limiting the upward movement of the adjusting screw relative to the pull-out cylinder to its extreme position.

2. The device for removing the plug of a pressure-holding valve as described in claim 1, characterized in that... The locking and retaining mechanism further includes an elastic pusher, the positioning member is disposed inside the pull-out cylinder, the elastic pusher is disposed between the release part and the positioning member, and the elastic pusher applies an elastic bias force to the release part, so that the two hook parts maintain a clamping tendency to move closer to each other when the release part is not under force.

3. The device for removing the plug of a pressure-holding valve as described in claim 2, characterized in that... The elastic pushing member is a spring post. The positioning sleeve is provided with a concave hole, and the release part is provided with a corresponding concave cavity. The two ends of the spring post extend into the concave hole and the concave cavity respectively. The spring post applies an elastic bias force to the release part so that the spring post pushes against the release part.

4. The device for removing the plug of a pressure-holding valve as described in claim 1, characterized in that... An adjusting nut is screwed onto the upper part of the adjusting screw, and the adjusting nut is located outside the pull-out cylinder. The limiting block is axially movable inside the pull-out cylinder, and an upper elastic element is provided between the limiting block and the convex ring. The upper elastic element is sleeved on the adjusting rod. By rotating the adjusting nut, the adjusting screw is driven to move axially with the limiting block to adjust the preload of the upper elastic element.

5. The device for removing the plug of a pressure-holding valve as described in claim 4, characterized in that... The side of the pull-out cylinder is provided with a threaded hole that passes through the inside and outside of the pull-out cylinder, corresponding to the position of the limiting block. A set screw is screwed into the threaded hole, and the inner end of the set screw abuts against the limiting block to lock and fix the position of the limiting block.

6. The device for removing the plug of a pressure-holding valve as described in claim 1, characterized in that... The clamping part is disposed inside the guide cylinder, and the guide cylinder has an opening that extends through the inside and outside corresponding to the position of the clamping part, so that the clamping part can pass through when the clamping parts are far apart.

7. The device for removing the plug of a pressure-holding valve as described in claim 1, characterized in that... The bottom of the hook portion is provided with an inlet ramp. When the pull-out device is inserted into the plug direction, the inlet ramp abuts against the edge of the plug and generates a radial force that forces the two clamping portions to move away from each other, so that the hook portion slides in and hooks onto the mating part.

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