An overpressure relief hydrant valve

Abstract

The application relates to the technical field of valves and discloses an overpressure self-discharge fire hydrant valve which comprises a main valve body, an adjuster, a joint, a pressure relief mechanism and a conduit. In the application, when a sliding block moves horizontally to form a gap with a drain pipe, water is discharged to the drain pipe for pressure relief. At this time, intermittent blocking is carried out through triangular blocks, so that the sliding block cannot rebound quickly after the pressure relief is completed, more water pressure is leaked, the water pressure is prevented from being in a persistent extreme pressure relief state, an extrusion ring extrudes an elastic block and a surface of a deformation plate, the elastic block and the extrusion ring generate mutual pressing force under the compression elastic force of a third spring, water at a water inlet cavity position is prevented from penetrating between the extrusion ring and a sealing plate, and through the mutual pressing force and the relatively soft material of the extrusion ring, the problem that roughness is increased due to metal rusting and rusting is easily caused is avoided.

Description

Technical Field

[0001] This invention relates to the field of valve technology, specifically an overpressure self-relieving fire hydrant valve. Background Technology

[0002] Overpressure self-relieving fire hydrants can automatically open and close according to the system's working pressure. They are generally installed on equipment or pipelines in closed systems to protect system safety. By automatically regulating pipeline pressure, they ensure that the system operates within a safe range. When the pipeline pressure exceeds the preset value, the valve automatically opens through the pilot valve to relieve pressure. After the pressure returns to normal, it automatically closes. The pilot valve opens to drain water and relieve pressure, maintaining stable pipeline pressure.

[0003] However, during the depressurization process, rotation is required to adjust the ultimate pressure value. This adjustment is achieved using a screw rotation, with the ultimate pressure value adjusted under the action of a spring. The spring's movement can cause the pressure to accumulate again after the ultimate pressure value is released, preventing most of the pressure from being released at the ultimate pressure. This results in the pressure remaining at the ultimate state and repeated intermittent depressurization, keeping the water pressure consistently at the ultimate pressure. Furthermore, the self-releasing fire hydrant valve uses a pressure-opening structure, making it easy for water to seep into the pressure-opening position under high pressure. This can cause the valve opening and closing positions to rust, affecting closure. Summary of the Invention

[0004] The present invention provides an overpressure self-relieving fire hydrant valve, which overcomes the shortcomings described in the background art.

[0005] The technical solution adopted by this invention to solve its technical problem is:

[0006] An overpressure self-relieving fire hydrant valve includes a main valve body 1, a regulator 2, a connector 3, a pressure relief mechanism 4, a conduit 5, and a main valve 6. The main valve 6 is connected to the left end of the main valve body 1 and allows water to flow through. The connector 3 is symmetrically arranged on the left and right sides of the main valve body 1. The regulator 2 is fixed to the upper end of the main valve body 1, and the conduits 5 on the left and right sides of the regulator 2 are connected to the interior of the main valve body 1. The pressure relief mechanism 4 is connected at its upper and lower ends to the upper and left ends of the main valve body 1. When the pressure at the left end of the main valve body 1 increases, the pressure is relieved through the connected pressure relief mechanism 4.

[0007] The main valve body 1 includes a valve cover 11, a valve core block 12, a valve core rod 13, a water inlet chamber 14, a drain chamber 15, a diaphragm 16, and a valve body shell 17. The valve core block 12 is sleeved on the outside of the valve core rod 13. The water inlet chamber 14 and the drain chamber 15 are located on the left and right sides inside the valve body shell 17, respectively. They are separated by the valve core block 12 pressing against the inner wall of the valve body shell 17. The valve cover 11 seals the outer periphery of the diaphragm 16 at the upper end of the valve body shell 17, forming a cavity above the diaphragm 16. The valve core rod 13 passes through the valve cover 11 and moves vertically. The valve core rod 13 drives the diaphragm 16 to move up and down in the cavity. The pressure relief mechanism 4 is provided with an adjustment mechanism 41 and a switch gate tube 42. The adjustment mechanism 41 and the switch gate tube 42 are respectively connected to the left and right sides of the valve cover 11. The adjustment mechanism 41 connects the cavity above the diaphragm 16 and the water inlet chamber 14. When the water pressure in the water inlet chamber 14 increases, the pressure is transmitted to the cavity, and the adjustment mechanism 41 releases the pressure.

[0008] In a preferred embodiment, the adjusting mechanism 41 includes a return pipe 411, a diversion pipe 412, a slider 413, a limiting structure 414, a first spring 415, a screw 416, and a handle 417. The return pipe 411 connects the cavity above the diaphragm 16 and the water inlet chamber 14 through the diversion pipe 412. The limiting structure 414 is located at the upper end of the diversion pipe 412 and provides elastic blocking for the slider 413. The first spring 415 connects the slider 413 and the screw 416 at both ends. The handle 417 is screwed outside the screw 416, and the screw 416 moves spirally inside the diversion pipe 412, causing the slider 413 to move within the diversion pipe 412 under the elasticity of the first spring 415.

[0009] In a preferred embodiment, the limiting structure 414 includes a movable block 31, a blocking block 32, a slide rail 33, a connecting plate 34, and a trapezoidal plate 35. The slide rail 33 is horizontally arranged within the connecting plate 34. The movable block 31 slides horizontally within the slide rail 33. The lower end of the movable block 31 slides along a track on the surface of the trapezoidal plate 35, causing the trapezoidal plate 35 to move downward within the connecting plate 34. The blocking blocks 32 are arranged at the lower end of the trapezoidal plate 35 and elastically block the slider 413. The surface of the slider 413 corresponding to the blocking block 32 is provided with toothed blocks 101, and the right-angled side of the toothed blocks 101 abuts against the right-angled side of the blocking block 32.

[0010] In a preferred embodiment, the blocking block 32 is provided with a rotating rod 21, a triangular block 22, a support plate 23, and a second spring 24. The triangular block 22 rotates within the support plate 23 via the rotating rod 21. The second spring 24 connects the support plate 23 and the triangular block 22 at both ends. When the triangular block 22 rotates, it elastically stretches the second spring 24. The triangular block 22 abuts against the toothed block 101, and the triangular block 22 rotates due to the elasticity of the second spring 24.

[0011] In a preferred embodiment, the valve core block 12 is provided with a fixing block 121, a sealing plate 122, a compression ring 123, and a sleeve 124. The compression ring 123 is attached to the lower surface of the fixing block 121, and the sealing plate 122 is circumferentially disposed on the surface of the sleeve 124. The compression ring 123 and the sealing plate 122 abut against each other. The fixing block 121 is disposed on the outside of the valve core rod 13. When the fixing block 121 moves with the valve core rod 13, the compression ring 123 abuts against and presses against the surface of the sealing plate 122 to form a seal.

[0012] In a preferred embodiment, the sealing plate 122 is provided with an elastic block 51, a rotating shaft 52, a deformation plate 53 and a third spring 54. The deformation plate 53 is attached to the side of the elastic block 51, and the elastic blocks 51 are arranged in a ring. The lower end of the elastic block 51 is provided with a third spring 54 fixed to the upper end of the sleeve 124. The elastic block 51 rotates on the surface of the sleeve 124 through the rotating shaft 52, and the elastic block 51 supports the compression ring 123 to abut under the elasticity of the rotating shaft 52.

[0013] Compared with existing technologies, this technical solution has the following advantages:

[0014] In this invention, the right-angled sides of the triangular block meet, and the force of moving to the left will cause the triangular block to rotate around the rotating rod. Under the elastic force of the second spring, it will provide elastic resistance. When the water pressure on the slider is greatly reduced, the leftward elastic force of the slider is greater than the resistance of the second spring pair, thus causing the horizontal movement to drive the triangular block to rotate to the disengaged state. When the slider moves horizontally to create a gap with the drain pipe, water is discharged into the drain pipe to release pressure. At this time, the triangular block pair provides intermittent obstruction, preventing the slider from quickly rebounding after the pressure is released, thus allowing more water pressure to leak out and avoiding the water pressure from being in a continuous extreme pressure release state.

[0015] In this invention, when the third spring is stationary, the elastic block is in an upward tilted state. After the compression ring moves downward and contacts the elastic block, it needs to press the elastic block downward and rotate the elastic block to a horizontal state through the pivot. At this time, the elastic block compresses the third spring downward, and then the compression ring compresses the surface of the elastic block and the deformation plate. Under the compression force of the third spring, the elastic block and the compression ring generate mutual resistance force to prevent water in the water inlet cavity from easily seeping between the compression ring and the sealing plate. Through the mutual resistance force and the relatively soft material of the compression ring, the problem of increased roughness caused by metal rusting and easy rusting is avoided. Attached Figure Description

[0016] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0017] Figure 1 This is an overall diagram of the present invention.

[0018] Figure 2A plan view of the main valve body.

[0019] Figure 3 This is a side view of the adjustment mechanism.

[0020] Figure 4 This is a side view of the limiting structure.

[0021] Figure 5 This is a three-dimensional cross-sectional view of the blocking block.

[0022] Figure 6 This is a side view of the valve core block.

[0023] Figure 7 This is a partial three-dimensional schematic diagram of the sealing plate.

[0024] In the diagram: Main valve body-1, regulator-2, connector-3, pressure relief mechanism-4, conduit-5, valve cover-11, valve core block-12, valve core rod-13, water inlet chamber-14, drain chamber-15, diaphragm-16, valve body shell-17, regulating mechanism-41, switch gate-42, return pipe-411, drain pipe-412, slider-413, limiting structure-414, first spring-415, screw-416 , Rotary handle-417, Movable block-31, Blocking block-32, Slide rail rod-33, Connecting plate-34, Trapezoidal plate-35, Rotating rod-21, Triangular block-22, Support plate-23, Second spring-24, Fixed block-121, Sealing plate-122, Compression ring-123, Sleeve-124, Elastic block-51, Rotating shaft-52, Deformation plate-53, Third spring-54, Tooth block-101, Drain pipe-102. Detailed Implementation

[0025] like Figures 1 to 7 As shown, the present invention proposes an overpressure self-relieving fire hydrant valve, including a main valve body 1, a regulator 2, a connector 3, a pressure relief mechanism 4, a conduit 5, and a main valve 6. The main valve 6 is connected to the left end of the main valve body 1 and allows water to flow through. The connector 3 is symmetrically arranged on the left and right sides of the main valve body 1. The regulator 2 is fixed to the upper end of the main valve body 1, and the conduits 5 on the left and right sides of the regulator 2 are connected to the interior of the main valve body 1. The pressure relief mechanism 4 is connected at its upper and lower ends to the upper and left ends of the main valve body 1. When the pressure at the left end of the main valve body 1 increases, the pressure is relieved through the connected pressure relief mechanism 4.

[0026] The main valve body 1 includes a valve cover 11, a valve core block 12, a valve core rod 13, a water inlet chamber 14, a drain chamber 15, a diaphragm 16, and a valve body shell 17. The valve core block 12 is sleeved on the outside of the valve core rod 13. The water inlet chamber 14 and the drain chamber 15 are located on the left and right sides inside the valve body shell 17, respectively. They are separated by the valve core block 12 pressing against the inner wall of the valve body shell 17. The valve cover 11 seals the outer periphery of the diaphragm 16 at the upper end of the valve body shell 17, forming a cavity above the diaphragm 16. The valve core rod 13 passes through the valve cover 11 and moves vertically. The valve core rod 13 drives the diaphragm 16 to move up and down in the cavity. The pressure relief mechanism 4 is provided with an adjustment mechanism 41 and a switch gate tube 42. The adjustment mechanism 41 and the switch gate tube 42 are respectively connected to the left and right sides of the valve cover 11. The adjustment mechanism 41 connects the cavity above the diaphragm 16 and the water inlet chamber 14. When the water pressure in the water inlet chamber 14 increases, the pressure is transmitted to the cavity, and the adjustment mechanism 41 releases the pressure.

[0027] Furthermore, the main valve 6 connects to the left end of the water inlet chamber 14 inside multiple main valve bodies 1. By controlling the opening and closing of the main valve 6, each main valve body 1 can control the water flow. Meanwhile, the regulating mechanism 41 performs overpressure self-release on the multiple water inlet chambers 14 connected by the main valve 6 to ensure that the water flow pressure of each main valve body 1 will not be overloaded.

[0028] Furthermore, a valve switch is provided at the outer end of the switch gate tube 42. Water in the inlet chamber 14 flows into the cavity above the diaphragm 16 through the regulating mechanism 41. The water in the cavity is discharged through the switch gate tube 42 to relieve pressure. At this time, the diaphragm 16 moves upward due to the decrease in pressure in the cavity, and drives the valve core rod 13 to move upward. Thus, the valve core rod 13 drives the valve core block 12 to separate from the middle channel of the valve body shell 17, and allows the water in the inlet chamber 14 to flow to the drain chamber 15, realizing the flow of water.

[0029] Furthermore, when the switch gate 42 is opened, water enters the lower end of the regulator 2 from the end of the left end of the conduit 5 connected to the water inlet chamber 14. Under the flow of water, the lower end of the regulator 2 is impacted, and the upper end of the valve core rod 13 is pushed to move. Then, the water flows from the right end of the conduit 5 into the drain chamber 15. Through the connection of the conduit 5 to the water inlet chamber 14 and the drain chamber 15, the water pressure on both sides remains unchanged after flow. When the switch gate 42 is closed, the water pushes and forms pressure in the cavity above the diaphragm 16, causing the diaphragm 16 to move downward. Thus, the valve core rod 13 is squeezed downward by the pressure of the cavity, and then the valve core block 12 closes the inside of the valve body shell 17, thus stopping the water in the water inlet chamber 14.

[0030] In this invention, when the water pressure is too high, the switch gate 42 is in a closed state, and water enters the regulating mechanism 41 from the water inlet chamber 14. Under pressure, the water squeezes the regulating mechanism 41 and forms pressure leakage through the regulating mechanism 41.

[0031] The adjustment mechanism 41 includes a return pipe 411, a diversion pipe 412, a slider 413, a limiting structure 414, a first spring 415, a screw 416, and a handle 417. The return pipe 411 connects the cavity above the diaphragm 16 and the water inlet cavity 14 through the diversion pipe 412. The limiting structure 414 is located at the upper end of the diversion pipe 412 and provides elastic blocking for the slider 413. The first spring 415 connects the slider 413 and the screw 416 at both ends. The handle 417 is screwed outside the screw 416, and the screw 416 moves spirally inside the diversion pipe 412, causing the slider 413 to move within the diversion pipe 412 under the elasticity of the first spring 415.

[0032] The lower end of the drainage pipe 412 is equipped with a drain pipe 102. When the slider 413 moves within the drainage pipe 412, it blocks the flow to the drain pipe 102. When the water pressure is too high, the water will squeeze the slider 413, causing it to compress the first spring 415 to the right, thus allowing water to flow out to the drain pipe 102 to relieve pressure. After the pressure decreases, the slider 413 moves to the left under the elastic force of the first spring 415, stopping the flow of water to the drain pipe 102. Furthermore, by rotating... Turning the handle 417 causes the screw 416 to push the slider 413 to the left, thereby changing the initial resistance of the slider 413 to the water pressure. This allows the slider 413 to move to the right only after the water pressure reaches a certain limit. Furthermore, when water flows out of the drain pipe 102 to release pressure, the limiting structure 414 provides some resistance to the slider 413, preventing it from quickly rebounding and cutting off the drain pipe 102 after pressure release. This relieves most of the pressure and prevents the water pressure from remaining at its limit for an extended period.

[0033] The limiting structure 414 includes a movable block 31, a blocking block 32, a slide rail 33, a connecting plate 34, and a trapezoidal plate 35. The slide rail 33 is horizontally arranged inside the connecting plate 34. The movable block 31 slides horizontally within the slide rail 33. The lower end of the movable block 31 slides along a track on the surface of the trapezoidal plate 35, causing the trapezoidal plate 35 to move downward within the connecting plate 34. The blocking blocks 32 are arranged at the lower end of the trapezoidal plate 35 and elastically block the slider 413. The surface of the slider 413 corresponding to the blocking block 32 is provided with toothed blocks 101, and the right-angled side of the toothed blocks 101 abuts against the right-angled side of the blocking block 32.

[0034] Furthermore, the surface of the trapezoidal plate 35 is inclined at 10°. In this invention, the movable block 31 is manually pushed to move horizontally on the slide rail 33. At this time, the lower end of the movable block 31 will slide on the inclined surface of the trapezoidal plate 35, thereby pushing the trapezoidal plate 35 downward within the connecting plate 34. At this time, the blocking block 32 at the lower end of the trapezoidal plate 35 is closer to the position of the toothed block 101 on the surface of the slider 413, and thus the blocking force of the right-angled side of the blocking block 32 and the right-angled side of the toothed block 101 is greater. When the slider 413 moves to the right under water pressure, the inclined side of the toothed block 101 slides and guides the slider according to the inclined side of the blocking block 32. When the pressure is released, the slider 413 rebounds under the force. When moving to the left, the toothed block 101 is elastically blocked by the blocking block 32, preventing the slider 413 from rebounding quickly and cutting off the water discharged to the drain pipe 102. The downward movement of the blocking block 32 increases the elastic resistance of the toothed block 101. By pushing the movable block 31 horizontally, the elastic resistance of the blocking block 32 to the slider 413 is adjusted, thereby adjusting the interval of the blocking. When the water pressure decreases to less than the elastic force of the first spring 415 and the blocking block 32, the toothed block 101 breaks through the elastic resistance of the blocking block 32 under the elastic force of the first spring 415, and the slider 413 moves to the left and cuts off the water discharged to the drain pipe 102.

[0035] Furthermore, the slide rail rod 33 is made of aluminum alloy, and the middle track position has a certain elastic deformation effect. The track position on the inner side of the slide rail rod 33 is a continuous arc structure. The side of the movable block 31 is provided with equidistant circular rods. The circular rods slide in the continuous arc structure position, and the track position of the slide rail rod 33 expands elastically, which facilitates the translation of the circular rods on the side of the movable block 31. When the movable block 31 stops moving, the continuous arc structure of the track position limits the movement of the movable block 31, so that the movable block 31 is limited after moving, which makes it easy for the trapezoidal plate 35 at the lower end of the movable block 31 to remain fixed.

[0036] The blocking block 32 is provided with a rotating rod 21, a triangular block 22, a support plate 23, and a second spring 24. The triangular block 22 rotates within the support plate 23 via the rotating rod 21. The second spring 24 connects the support plate 23 and the triangular block 22 at both ends. When the triangular block 22 rotates, it elastically stretches the second spring 24. The triangular block 22 abuts against the toothed block 101, and the triangular block 22 rotates due to the elasticity of the second spring 24.

[0037] In this invention, the right-angled side of the triangular block 22 abuts against the right-angled side of the toothed block 101. The force of the toothed block 101 moving to the left will cause the triangular block 22 to rotate around the rotating rod 21, and it will be elastically blocked by the elastic force of the second spring 24. When the water pressure push on the slider 413 is greatly reduced, the elastic force of the slider 413 to the left is greater than the resistance of the second spring 24 to the toothed block 101. Thus, the horizontally moving toothed block 101 drives the triangular block 22 to rotate to the disengaged state. When the slider 413 moves horizontally to create a gap with the drain pipe 102, water is discharged into the drain pipe 102 to release pressure. At this time, the triangular block 22 intermittently blocks the toothed block 101, so that the slider 413 cannot quickly rebound after the pressure is released, so that more water pressure is leaked and the water pressure is prevented from being in a continuous extreme pressure release state.

[0038] The valve core block 12 is provided with a fixing block 121, a sealing plate 122, a compression ring 123 and a sleeve 124. The compression ring 123 is attached to the lower surface of the fixing block 121, and the sealing plate 122 is arranged around the surface of the sleeve 124. The compression ring 123 and the sealing plate 122 abut against each other. The fixing block 121 is located on the outside of the valve core rod 13. When the fixing block 121 moves with the valve core rod 13, the compression ring 123 abuts against the surface of the sealing plate 122 to form a seal.

[0039] Furthermore, the compression ring 123 is made of rubber and is flexible. The fixing block 121 moves vertically along with the valve core rod 13. When the compression ring 123 contacts the sealing plate 122, the material of the compression ring 123 can avoid the problem of water seepage caused by metal rusting and surface roughness.

[0040] The sealing plate 122 is provided with an elastic block 51, a rotating shaft 52, a deformation plate 53 and a third spring 54. The deformation plate 53 is attached to the side of the elastic block 51, and the elastic blocks 51 are arranged in a ring. The lower end of the elastic block 51 is provided with a third spring 54 fixed to the upper end of the sleeve 124. The elastic block 51 rotates on the surface of the sleeve 124 through the rotating shaft 52, and the elastic block 51 supports the compression ring 123 to abut under the elasticity of the rotating shaft 52.

[0041] In this invention, the deformation plate 53 is made of rubber. When the third spring 54 is stationary, the elastic block 51 is in an upward tilted state. After the compression ring 123 moves downward and contacts the elastic block 51, it needs to press the elastic block 51 downward and rotate the elastic block 51 to a horizontal state through the rotating shaft 52. At this time, the elastic block 51 compresses the third spring 54 downward, and then the compression ring 123 compresses the surface of the elastic block 51 and the deformation plate 53. Under the compression force of the third spring 54, the elastic block 51 and the compression ring 123 generate mutual resistance pressure to prevent water at the water inlet cavity 14 from easily seeping between the compression ring 123 and the sealing plate 122. Through the mutual resistance pressure and the relatively soft material of the compression ring 123, the problem of increased roughness caused by metal rusting and easy rusting is avoided.

[0042] The above description is merely a preferred embodiment of the present invention, and therefore should not be construed as limiting the scope of the present invention. All equivalent changes and modifications made in accordance with the scope of the patent and the contents of the specification should still fall within the scope of the present invention.

Claims

1. An overpressure relief hydrant valve, comprising: Including main valve body, regulator, joint, pressure relief mechanism, conduit and total valve bolt, the total valve bolt accesses the left end of main valve body and carries out water, the joint is symmetrically arranged in the left and right sides of main valve body, the regulator is fixed on the upper end of main valve body, and the conduit of the left and right sides of regulator is communicated with the inside of main valve body, the pressure relief mechanism is communicated with the upper end and the left end of main valve body at the upper and lower ends, when the pressure of the left end of main valve body increases, the pressure relief mechanism is communicated and pressure relief; The main valve body includes valve cover, valve core block, valve core rod, water inlet cavity, drain cavity, diaphragm and valve body shell, the valve core block is sleeved on the outer side of valve core rod, the water inlet cavity and the drain cavity are respectively located on the left and right sides in the inside of valve body shell, and are separated by the valve core block pressing the inner wall of valve body shell, the valve cover seals the periphery of diaphragm on the upper end of valve body shell, a cavity is formed above the diaphragm, the valve core rod vertically moves through the valve cover, the diaphragm moves up and down in the cavity by the valve core rod, the pressure relief mechanism is provided with adjusting mechanism and switch gate pipe, the adjusting mechanism and the switch gate pipe are respectively connected on the left and right sides of valve cover, and the adjusting mechanism communicates the cavity above the diaphragm and the water inlet cavity, when the water pressure of water inlet cavity becomes larger, the pressure is transmitted to the cavity, and the adjusting mechanism is used to discharge the pressure outside; The adjusting mechanism is provided with return pipe, drainage pipe, sliding block, limiting structure, first spring, screw rod and handle, the return pipe is communicated with the cavity above the diaphragm and the water inlet cavity through the drainage pipe, the limiting structure is arranged on the upper end of drainage pipe, and elastically blocks the sliding block, the first spring is connected between the sliding block and the screw rod, the handle is screwed on the outside of screw rod, the screw rod spirally moves in the inside of drainage pipe, and the sliding block moves in the inside of drainage pipe under the elasticity of first spring; The limiting structure is provided with movable block, blocking block, slide rail rod, connecting plate and trapezoidal plate, the slide rail rod is horizontally arranged in the connecting plate, the movable block horizontally slides in the slide rail rod, the lower end of movable block slides on the surface track of trapezoidal plate, and the trapezoidal plate moves downward in the connecting plate, the blocking blocks are arranged on the lower end of trapezoidal plate, and elastically block the sliding block, the surface of sliding block is provided with tooth block, and the right angle edge of tooth block abuts against the right angle edge of blocking block.

2. A pressure relief valve according to claim 1, wherein The blocking block is provided with rotating rod, triangular block, supporting plate and second spring, the triangular block rotates in the supporting plate through the rotating rod, the second spring is connected between the supporting plate and the triangular block, and the triangular block rotates to elastically stretch the second spring, the triangular block abuts against the tooth block, and rotates through the elasticity of second spring.

3. A pressure relief valve according to claim 2, wherein The valve core block is provided with fixed block, sealing plate, extrusion ring and sleeve, the extrusion ring is attached to the lower surface of fixed block, the sealing plate is annularly arranged on the surface of sleeve, and the extrusion ring abuts against the sealing plate, the fixed block is arranged on the outer side of valve core rod, and the extrusion ring abuts against and presses the sealing plate surface to form sealing when the fixed block moves with valve core rod.

4. A pressure relief valve according to claim 3, wherein The sealing plate is provided with elastic blocks, a rotating shaft, a deformation plate and a third spring, the deformation plate is attached to the side of the elastic blocks, the elastic blocks are arranged in a ring shape, the lower end of the elastic blocks is provided with the third spring fixed on the upper end of the sleeve, the elastic blocks rotate on the surface of the sleeve through the rotating shaft and support and press the ring against the sleeve under the elasticity of the rotating shaft.

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