Leak-proof high-pressure valve and packing dismounting tool thereof

Abstract

The high-pressure valve comprises a valve rod and a valve plate which are installed in a valve body, the packing is installed between the valve rod and a valve cover, the valve plate is a plate-shaped body provided with a liquid flow opening, and the matching face between the valve plate and a valve seat is a plane. An anti-falling connector is arranged at the lower end of the valve rod and is connected with the valve plate; the outer diameter of the anti-disengaging connector is larger than the inner diameter of the center hole of the valve deck, and a stabbing leakage prevention sealing ring is arranged on the upper portion of the anti-disengaging connector. The packing disassembling and assembling tool is provided with a handle and a connecting rod, the connecting rod is connected with the handle, the lower portion of the connecting rod is a barb cone with threads, and a lower inclined hook opening is formed in a lower cone body in the barb cone. And the maximum outer diameter of the barb cone is equal to or smaller than the width of a filling core in the packing. According to the utility model, leakage can be prevented, and parts such as the valve rod are prevented from flying out of the valve body. The conveying and injecting capacity of the high-pressure valve is improved, normal operation of production is guaranteed, the environment is protected, and the remarkable using effect is achieved.

Description

Technical Field

[0001] The utility model relates to the technical field of high-pressure valves, in particular to a leakage-proof high-pressure valve and a packing disassembly and assembly tool thereof, which is particularly suitable for water injection, steam injection and polymer injection equipment in the oil development industry. Background Art

[0002] As oilfield development enters the middle and late stages, oilfield injection work becomes more and more important, with more and more injection wells, and the use of high-pressure valves is also increasing. Each injection well and pump station needs to install and use high-pressure valves. At least 6 high-pressure valves need to be installed in each injection well, and a large number of high-pressure valves also need to be installed and used in the water distribution room and water injection pump station.

[0003] The sealing materials of the high-pressure valves currently in use are mostly rubber or fiber materials, which require a large pressure to seal, resulting in a large opening and closing resistance of the valve. In addition, the rubber or fiber materials are prone to aging, which leads to leakage or puncture of the high-pressure valves. The valve stem and the large cover often leak, which not only poses a great safety and environmental hazard, but also seriously affects the injection rate.

[0004] Since produced water is corrosive, the connection between the valve plate and the valve stem of the high-pressure valve often falls off, seriously affecting production. If the above-mentioned connection and the valve stem thread are damaged at the same time, the valve stem and other components will be blown out of the valve body by the high-pressure liquid, which poses a great safety hazard. The valve plate and valve plate seat of the current high-pressure valve are mostly wedge-shaped structures, which need to be pressed tightly to seal the high-pressure liquid. The friction resistance is large, which makes the opening and closing of the valve laborious and time-consuming.

[0005] After searching, the following high-pressure valves are related to it: Patent application number CN201510222208.2, authorization announcement number CN201510222208A discloses a deep-sea high-pressure valve stem bidirectional sealing structure and a sealing wear reduction test method. The above invention relates to a deep-sea high-pressure valve stem bidirectional sealing structure and a sealing wear reduction test method, including an underwater actuator arranged at one end of the valve, each sealing structure includes a valve body, an upper valve cover, a valve stem and a valve stem sealing part; the upper valve cover is connected to the valve body and the underwater actuator respectively, and a valve stem sealing part is arranged between the upper valve cover and the valve stem; a detection threaded hole is arranged on one side of the upper valve cover. The above invention adopts a multiple combination seal that the balance pressure in the underwater actuator at both ends of the valve stem sealing device and the medium pressure in the valve act on the valve stem in two relative directions respectively, and the sealing force increases with the increase of pressure to realize the bidirectional pressure sealing of the valve stem. Grease is injected into the inside of the valve stem through the threaded detection hole arranged on the upper valve cover to improve the service life of the seal and the flexibility of the valve stem movement. The above invention can be widely used in the field of deep-sea control valves.

[0006] The above device still has the following defects: two-way sealing, complex structure, high cost, many failure points, difficult repair and maintenance, suitable for deep sea but not suitable for land.

[0007] Patent application number: CN202123288143.1, authorization announcement number: CN216430645U discloses "a leakage prevention device for oil and gas gathering and transportation valves". The utility model includes: a shell, the shell includes an upper shell and a lower shell; four arc-shaped avoidance grooves, the four arc-shaped avoidance grooves are respectively arranged on the outer wall of the upper shell and the lower shell close to each other; a valve, the valve is arranged in the shell; two connecting pipes, the two connecting pipes are fixedly installed at both ends of the valve, and the other ends of the two connecting pipes extend out of the shell; four arc-shaped mounting rings, the four arc-shaped mounting rings are respectively fixedly installed on the outer walls of the two connecting pipes; four arc-shaped sealing grooves, the four arc-shaped sealing grooves are respectively arranged on the outer walls of the four arc-shaped mounting rings. The leakage prevention device for oil and gas gathering and transportation valves provided by the utility model has the advantages of simple operation, convenient disassembly and assembly, and good protection effect.

[0008] The above device is only an anti-leakage device for high-pressure valves and still has the following defects: the pressure bearing capacity is low and it is not suitable for situations with higher working pressures; it only protects the outside of the valve without making any changes to the valve structure, the sealing performance is poor, and it cannot avoid the safety hazard of the valve stem falling off and flying out.

[0009] Patent application number: CN201220458178.7, authorization announcement number: The "high temperature and high pressure flat gate valve" disclosed in CN202790608U includes a valve body, a valve seat, a gate plate, a valve cover, a valve stem, a bracket, a hand wheel, a seal and a mounting part. The main purpose is to provide a middle cavity self-sealing device between the outer side of the valve cover and the inner wall of the valve body. The middle cavity self-sealing device is composed of a double wedge sealing ring and a wedge gasket ring installed on the conical inclined surface on the outer side of the valve cover. The lower wedge surface of the double wedge sealing ring is dynamically sealed with the conical inclined surface on the outer side of the valve cover, the upper wedge surface of the double wedge sealing ring is dynamically sealed with the lower wedge surface of the wedge gasket ring, the outer cylindrical surface of the double wedge sealing ring is dynamically sealed with the inner wall of the valve body, and the upper end surface of the wedge gasket ring is fixed and pressed by a four-open ring in the mounting groove of the inner wall of the valve body. The double wedge sealing ring and the wedge gasket ring are made of metal materials, and an annular groove is formed in the middle of the outer cylindrical surface of the double wedge sealing ring. The higher the pressure, the better the sealing performance, and it has the advantages of reliable sealing performance and long service life. It is suitable for high temperature and high pressure medium working conditions in industries such as petroleum, petrochemical, and natural gas.

[0010] However, the above device still has the following defects: flexible graphite material is used as sealing material, the sealing material has low strength and is easily damaged and leaked; a metal spacer ring is provided, and when used in a place with corrosive media, the metal spacer ring is easily corroded; a double wedge seal is used, the friction resistance is large, the valve is time-consuming and laborious to open and close, and it is easy to be damaged when impurities such as scaling appear. Summary of the invention

[0011] The purpose of the utility model is to develop a leak-proof high-pressure valve and its packing disassembly and assembly tool, change the structure of the valve seat and valve stem in the high-pressure valve and the connection structure between the valve plate and the valve stem, improve the working safety of the high-pressure valve, and avoid the valve stem and other components from flying out of the valve body; improve the sealing structure of the valve stem, improve the sealing performance, reduce and avoid the leakage of the existing high-pressure valve. Improve the delivery and injection capacity of the high-pressure valve, ensure the normal operation of production, protect the environment, reduce the labor intensity of employees, and improve work efficiency.

[0012] The technical solution of the utility model is: an anti-leakage high-pressure valve, comprising a valve stem and a valve plate installed in a valve body, a packing is installed between the valve stem and the valve cover, wherein: the valve plate is a plate-shaped body provided with a liquid flow port and the matching surface between the valve seat is a plane; an anti-detachment connector is provided at the lower end of the valve stem, and the anti-detachment connector is connected to the valve plate; the outer diameter of the anti-detachment connector is larger than the inner diameter of the center hole of the valve cover, and an anti-puncture sealing ring is provided on the upper part of the anti-detachment connector.

[0013] Preferably, the anti-detachment connector is a plate structure and valve stem connection clamps are provided on both sides of the middle of the plate structure, and the valve stem connection clamps are connected to the valve plate clamping groove in the valve plate.

[0014] Preferably, the upper body of the valve plate is a U-shaped groove, and the valve plate slot is arranged inside the groove body of the U-shaped groove; the thickness of the valve stem connecting clamp arranged in the anti-detachment connector is consistent with the depth of the valve plate slot in the valve plate.

[0015] Preferably, the puncture-proof sealing ring is installed in the puncture-proof ring groove at the upper end of the anti-detachment connector; the groove body of the puncture-proof ring groove is a V-shaped groove with upper and lower relative slopes, and the puncture-proof sealing ring is installed in the groove between the upper and lower relative slopes.

[0016] Preferably, the outer diameter of the upper bevel of the V-shaped groove in the anti-puncture leakage ring groove is equal to the outer diameter of the valve stem; the outer diameter of the lower bevel of the V-shaped groove in the anti-puncture leakage ring groove is equal to the outer diameter of the anti-detachment connector and the lower bevel of the V-shaped groove is a finely machined sealing surface, which matches the lower chamfer of the lower end of the center hole of the valve cover.

[0017] Preferably, the packing inserted outside the valve stem and installed in the valve cover is a double sealing filler, the longitudinal section of the barrel wall of the packing is U-shaped, and the double sealing filler consists of a filling core and an outer sealing sleeve, and the filling core is filled in the filling groove in the outer sealing sleeve sealed at the lower end.

[0018] Preferably, the filling core of the packing is made of rubber material, the outer sealing sleeve is made of polymer composite nanomaterial, and a gasket is installed below the packing and between the valve stem and the valve cover; the openings of the filling core and the outer sealing sleeve face upward.

[0019] Preferably, a booster spring is installed between the main body and the valve seat at the periphery of the liquid flow hole in the valve body 1, and a guide ring is installed at the periphery of the fitting surface between the valve seat and the valve stem; the booster spring is a wave spring, and the outer diameter of the guide ring is larger than the outer diameter of the valve seat and has an interference fit with the valve seat.

[0020] Preferably, a grease injection hole radially penetrating the center hole of the valve cover is provided in the body of one side of the valve cover, and a grease injection nozzle is installed at the outer end of the grease injection hole; a pressure measuring and pressure relief hole radially penetrating the center hole of the valve cover is provided in the valve cover on the other side where the grease injection nozzle is installed, and a pressure measuring and pressure relief nozzle is installed at the outer end of the pressure measuring and pressure relief hole; a pressure gauge or a pressure relief valve can be connected to the pressure measuring and pressure relief nozzle.

[0021] A packing disassembly and assembly tool for use in a leakage-proof high-pressure valve, comprising a handle and a connecting rod, wherein the connecting rod is connected to the handle, the lower part of the connecting rod is a barbed cone with a thread, and a downwardly inclined hook opening is arranged in the lower cone of the barbed cone; the maximum outer diameter of the barbed cone is equal to or less than the width of the filling core in the packing.

[0022] Compared with the existing high-pressure valves, the use effects of the device are: 1. An anti-drop connection head is set at the lower end of the valve stem. The outer diameter of the anti-drop connection head is larger than the aperture of the center hole of the valve cover, which can effectively prevent the valve stem from flying out when the valve plate and the valve stem fall off, causing injuries to people and property, thereby improving the safety of the operation of the utility model.

[0023] 2. An anti-puncture sealing ring groove and an anti-puncture sealing ring are set on the upper end of the anti-detachment connector at the lower end of the valve stem. When the anti-puncture sealing ring seals the center hole of the valve cover, it can prevent liquid from leaking from here and high-pressure liquid from leaking from here from hurting people, making it easy to replace the packing in the valve cover.

[0024] 3. The structure and material of the packing have been improved. The filling core made of rubber material and the outer sealing sleeve made of polymer composite nanomaterial have small friction resistance and good sealing performance, which reduces the switching resistance of the valve.

[0025] 4. The utility model provides a pressure measuring and relief nozzle in the valve cover, which can test the pressure inside the high-pressure valve and can relieve the residual pressure around the valve stem in the valve body through this nozzle, so as to facilitate the replacement of the packing.

[0026] 5. A grease injection nozzle is provided on the other side of the pressure measuring and relief nozzle in the valve cover, through which sealing grease can be injected to further improve the sealing performance of the valve stem;

[0027] 6. A booster spring is designed and installed between the valve seat and the outer periphery of the valve body's liquid flow port. The booster spring can push the valve seat and the valve plate to move and cooperate in parallel, which not only ensures the seal, but also reduces the friction resistance compared to the existing high-pressure valves, making the opening and closing of the valve labor-saving and time-saving.

[0028] 7. A guide ring is installed outside the matching surface of the valve seat and the valve plate to guide the valve plate and prevent the valve plate and the valve seat from falling out during movement;

[0029] 8. A packing disassembly and assembly tool is designed to facilitate the disassembly and assembly of the packing in the valve cover.

[0030] In summary, the utility model can prevent leakage and avoid the valve stem and other components from flying out of the valve body. It improves the delivery and injection capacity of the high-pressure valve, ensures the normal operation of production, protects the environment, reduces the labor intensity of employees, improves work efficiency, and has a significant use effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] The accompanying drawings are used to provide a further understanding of the present invention and constitute a part of the specification. Together with the embodiments of the present invention, they are used to explain the present invention and do not constitute a limitation of the present invention. In the accompanying drawings:

[0032] Figure 1 It is a structural schematic diagram of the utility model.

[0033] Figure 2 yes Figure 1 A schematic diagram of the structure enlarged at I in the middle.

[0034] Figure 3 yes Figure 1 Schematic diagram of the structure of the middle packing.

[0035] Figure 4 yes Figure 1 Schematic diagram of the structure of the disassembly and assembly tool of the center packing.

[0036] In the figure: valve body 1, valve plate 2, guide ring 3, O-ring 4, valve seat 5, booster spring 6; valve stem 7, anti-drop connector 7-1, anti-puncture ring groove 7-2, anti-puncture sealing ring 7-3; valve cover gasket 8, valve cover 9, grease nipple 10; packing 11, filling core 11-1, outer sealing sleeve 11-2; gasket 12, packing gland 13, bearing box 14, grease nipple 15, thrust ball bearing 16, gland bolt 17, valve stem nut 18, bearing gland 19, upper gland 20, handwheel 21, pressure measuring and pressure relief nozzle 22; handle cz1; connecting rod cz2; barbed cone cz3. DETAILED DESCRIPTION

[0037] The accompanying drawings are for reference and illustration only and are not intended to limit the scope of protection of the present utility model. The technical solutions in the embodiments of the present utility model will be described clearly and completely below in conjunction with the accompanying drawings in the embodiments of the present utility model. Obviously, the described embodiments are only part of the embodiments of the present utility model, not all of them. Based on the embodiments of the present utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present utility model.

[0038] In order to make the purpose, technical solution and advantages of the utility model more clear, the utility model is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the utility model and are not used to limit the utility model.

[0039] In the description of the present invention, it should be understood that the terms "length", "width", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention. In addition, in the description of the present invention, "multiple" means two or more, unless otherwise clearly and specifically defined.

[0040] See also Figure 1-Figure 4 A leakage-proof high-pressure valve comprises a valve stem 7 and a valve plate 2 installed in a valve body 1, a packing 11 is arranged between the valve stem 7 and the valve cover 9, wherein: the valve plate 2 is a plate-shaped body provided with a liquid flow port and the mating surface between the valve seat 5 is a plane; an anti-detachment connector 7-1 is arranged at the lower end of the valve stem 7, and the anti-detachment connector 7-1 is connected to the valve plate 2; the outer diameter of the anti-detachment connector 7-1 is larger than the inner diameter of the center hole of the valve cover 9, and an anti-puncture sealing ring 7-3 is arranged at the upper part of the anti-detachment connector 7-1.

[0041] The current high-pressure valve is generally equipped with a valve body 1, a valve plate 2, an O-ring 4, a valve seat 5, a valve stem 7, a valve cover gasket 8, a valve cover 9, a packing 11, a packing gland 13, a bearing box 14, a grease nipple 15, a thrust ball bearing 16, a gland bolt 17, a valve stem nut 18, a bearing gland 19, an upper gland 20 and a handwheel 21.

[0042] The valve seat 5 is installed at the liquid flow ports on both sides of the valve body 1, the valve plate 2 and the valve stem 7 are connected in the valve body 1, and O-type sealing rings 4 are installed at the valve seat 5 and the liquid flow ports on both sides of the valve body 1. The upper end of the valve body 1 is connected to the valve cover 9 by bolts, and a valve cover sealing gasket 8 is also installed between the valve body 1 and the valve cover 9.

[0043] The packing 11 is installed between the valve cover 9 and the valve stem 7. A packing gland 13 is installed above the packing 11, and the valve stem 7 is sealed at this location through the packing 11.

[0044] A bearing box 14 is installed above the valve cover 9, and a valve stem nut 18 and a thrust ball bearing 16 are installed in the bearing box 14. The valve stem nut 18 is threadedly connected to the valve stem 7. The thrust ball bearing 16 is installed between the bearing box 14 and the valve stem nut 18. A grease nipple 15 is installed in the body of the bearing box 14 at this location, and grease can be injected through the grease nipple 15 to lubricate the thrust ball bearing 16.

[0045] A bearing gland 19 is installed above the thrust ball bearing 16 in the bearing box 14 , and the bearing box 14 and the bearing gland 19 are fastened by gland bolts 17 .

[0046] A hand wheel 21 and an upper pressure cover 20 are mounted on the upper portion of the valve stem nut 18 . The hand wheel 21 is fixedly connected to the valve stem nut 18 , and the upper pressure cover 20 is connected to the top of the valve stem nut 18 .

[0047] When the hand wheel 21 is rotated, the valve stem 7 connected to the valve stem nut 18 can move up and down, and the valve plate 2 is driven by the valve stem 7 to open or close the liquid flow ports on both sides of the valve seat 5 in the valve body 1.

[0048] The utility model improves the structure of the valve plate 2 and the valve seat 5, and at the same time improves the connection structure between the lower end of the valve stem 7 and the valve plate 2, so that the outer diameter of the anti-slip connector 7-1 is larger than the inner diameter of the center hole of the valve cover 9. Under the impact of high-pressure liquid, even if the valve plate 2 and the valve stem 7 fall off, the valve stem 7 cannot fly out of the valve body 1, thereby improving the safety of the high-pressure valve. At the same time, the utility model is provided with an anti-slip seal ring 7-3 on the upper part of the anti-slip connector 7-1. When the valve stem 7 drives the valve plate 2 to move upward and reaches the lower end of the valve cover 9, the anti-slip seal ring 7-3 seals the center hole of the valve cover 9, which can well prevent the high-pressure liquid from leaking out through the valve stem 7 and the valve cover 9, thereby avoiding the leakage phenomenon of the existing high-pressure valve. When the anti-slip seal ring 7-3 seals the center hole of the valve cover 9, it can prevent the liquid from leaking therefrom, and can also prevent the high-pressure liquid from leaking therefrom and injuring people, thereby facilitating the replacement of the packing 11 in the valve cover 9.

[0049] Based on the above embodiment 1, the utility model also has the following embodiments:

[0050] A preferred embodiment: the anti-drop connector 7-1 is a plate structure and valve stem connecting clamps 7-4 are provided on both sides of the middle of the plate structure, and the valve stem connecting clamps 7-4 are connected to the valve plate slot 2-1 in the valve plate 2.

[0051] A preferred embodiment: the upper body of the valve plate 2 is a U-shaped groove, the valve plate clamping groove 2-1 is arranged inside the groove body of the U-shaped groove; the thickness of the valve stem connection clamping platform 7-4 arranged in the anti-detachment connector 7-1 is consistent with the depth of the valve plate clamping groove 2-1 in the valve plate 2. The valve stem connection clamping platform 7-4 at the lower part of the anti-detachment connector 7-1 can be installed into the valve plate clamping groove 2-1 at the upper part of the valve plate 2 from the side of the valve plate clamping groove 2-1.

[0052] A preferred embodiment: the puncture-proof sealing ring 7-3 is installed in the puncture-proof ring groove 7-2 at the upper end of the anti-detachment connector 7-1; the groove body of the puncture-proof ring groove 7-2 is a V-shaped groove with relative inclined surfaces at the upper and lower ends, and the puncture-proof sealing ring 7-3 is installed in the groove between the upper and lower relative inclined surfaces.

[0053] A preferred embodiment: the outer diameter of the upper slope of the V-shaped groove in the anti-puncture leakage ring groove 7-2 is equal to the outer diameter of the valve stem 7; the outer diameter of the lower slope of the V-shaped groove in the anti-puncture leakage ring groove 7-2 is equal to the outer diameter of the anti-detachment connector 7-1, and the lower slope of the V-shaped groove is a finely machined sealing surface, which matches the lower chamfer of the lower end of the center hole of the valve cover 9. When the valve stem 7 is used to open the high-pressure valve, the valve stem 7 drives the valve plate 2 to move upward to the lower chamfer of the lower end of the center hole of the valve cover 9, and the lower slope of the V-shaped groove in the anti-puncture leakage ring groove 7-2 is tightly matched with the lower chamfer of the lower end of the center hole of the valve cover 9 to prevent liquid leakage from there.

[0054] A preferred embodiment: the packing 11 which is sleeved outside the valve stem 7 and installed in the valve cover 9 is a double sealing filler, the longitudinal section of the cylinder wall of the packing 11 is U-shaped, and the double sealing filler consists of a filling core 11-1 and an outer sealing sleeve 11-2, and the filling core 11-1 is filled in the filling groove in the outer sealing sleeve 11-2 which is sealed at the lower end.

[0055] A preferred embodiment: the filling core 11-1 of the packing 11 is made of rubber material, the outer sealing sleeve 11-2 is made of polymer composite nano material, and a gasket 12 is installed below the packing 11 and between the valve stem 7 and the valve cover 9; the openings of the filling core 11-1 and the outer sealing sleeve 11-2 face upward. The longitudinal section of the wall of the packing 11 is a "U"-shaped structure, and the whole is a circular ring structure, and the inner and outer sides and the bottom of the wall are made of pressure-resistant and wear-resistant polymer composite nano material. The filling groove in the outer sealing sleeve 11-2 is filled with a filling core 11-1 made of a rubber material with good elasticity. The packing 11 is installed in the valve cover 9, and the valve stem 7 passes through it. The openings of the filling core 11-1 and the outer sealing sleeve 11-2 face upward, toward the packing gland 13 above, and with the help of liquid pressure and the elastic force of the opening of the packing 11, it can play a role in sealing high-pressure liquid and reduce the resistance of the switch valve.

[0056] A preferred embodiment: a booster spring 6 is also installed between the body and the valve seat 5 at the periphery of the liquid flow hole in the valve body 1, and a guide ring 3 is installed at the periphery of the fitting surface of the valve seat 5 and the valve stem 7; the booster spring 6 is a wave spring, and the outer diameter of the guide ring 3 is larger than the outer diameter of the valve seat 5 and has an interference fit with the valve seat 5. The booster spring 6 is installed between the body and the valve seat 5 at the periphery of the liquid flow hole in the valve body 1, which can push the valve seat 5 and the valve plate 2 to always fit properly. The valve plate 2 and the valve seat 5 are both flat structures, and the plane fits when moving up and down, and the friction resistance is small. The valve plate and valve seat of the valves currently in use are mostly wedge-shaped structures, which need to be pressed to seal. The valve plate and valve seat of the high-pressure valve are in parallel contact and sealing under the action of the booster spring. After installing the booster spring 6, it can ensure sealing and reduce friction resistance. The guide ring 3 is installed on the valve seat 5 to guide the valve plate 2 and prevent the valve plate 2 from coming out of the valve seat 5.

[0057] A preferred embodiment: a grease injection hole radially penetrating the center hole of the valve cover 9 is provided in one side of the body of the valve cover 9, and a grease injection nozzle 10 is installed at the outer end of the grease injection hole; a pressure measuring and pressure relief hole radially penetrating the center hole of the valve cover 9 is provided in the valve cover 9 on the other side where the grease injection nozzle 10 is installed, and a pressure measuring and pressure relief nozzle 22 is installed at the outer end of the pressure measuring and pressure relief hole; a pressure gauge or a pressure relief valve can be connected to the pressure measuring and pressure relief nozzle 22. The utility model provides a grease injection hole and a grease injection nozzle 10 in the valve cover 9. Through the grease injection hole connected to the center hole of the valve cover 9, before the high-pressure valve is put into use or during use, sealing grease is injected through the grease injection nozzle 10, which can further improve the sealing performance of the valve stem 7. By installing a pressure gauge through the pressure measuring and relief nozzle 22 which is connected to the center hole of the valve cover 9, the pressure inside the high-pressure valve can be detected; by installing a pressure relief valve in the pressure measuring and relief nozzle 22, the residual pressure around the valve stem 7 can be released through the pressure relief valve, which facilitates the replacement of the packing 11 and the anti-puncture leakage sealing ring 7-3.

[0058] The packing disassembly and assembly tool used for the anti-leakage high-pressure valve is provided with a handle cz1 and a connecting rod cz2, wherein:

[0059] The connecting rod cz2 is connected to the handle cz1. The lower part of the connecting rod cz2 is a threaded hook cone cz3. A lower oblique hook opening is arranged in the lower cone of the hook cone cz3. The maximum outer diameter of the hook cone cz3 is equal to or less than the width of the filling core 11-1 in the packing 11.

[0060] The packing removal tool can be used to conveniently and quickly remove and install the packing 11: when removing the packing 11, insert the packing removal tool into the filling core 11-1 in the packing 11, hold the handle cz1 and rotate it, and the threaded barb cone cz3 at the bottom of the connecting rod cz2 will quickly drill into the filling core 11-1. When it reaches half the depth of the filling core 11-1, lift the handle cz1 and easily remove the packing 11 in one piece.

[0061] When installing the packing 11, screw the barb cone cz3 in the disassembly tool into the filling core 11-1, and install the packing 11 into the valve cover 9 through the packing disassembly tool.

[0062] The anti-drop connector 7-1 is arranged at the lower part of the valve stem 7, and is connected to the valve stem 7 as a whole. Its outer diameter is larger than the inner diameter of the center hole of the valve cover 9 and is stepped. It can prevent the valve stem 7 from flying out and injuring people when the valve stem 2 and the valve stem 7 fall off.

[0063] The anti-puncture leakage ring groove 7-2 is arranged at the top of the anti-detachment connector 7-1, and the anti-puncture leakage sealing ring 7-3 is installed in the anti-puncture leakage ring groove 7-2 at the top of the anti-detachment connector 7-1. When the valve is fully opened or the valve stem 7 and the valve plate 2 fall off, it plays a sealing role together with the packing 11 to prevent the leakage of high-pressure liquid from injuring people, and it is convenient to replace the packing 11 outside the valve stem 7.

[0064] The dedicated packing disassembly and assembly tool is easy to use and can quickly replace the packing 11.

[0065] The embodiments described above are only typical embodiments, but the utility model is not limited to these embodiments, and those skilled in the art can make modifications without departing from the spirit and enlightenment of the utility model. Although the utility model is described in detail with reference to the aforementioned embodiments, for those skilled in the art, it is still possible to modify the technical solutions recorded in the aforementioned embodiments, or to replace some of the technical features therein by equivalents. Any modifications, equivalent replacements, improvements, etc. made within the creative spirit and creative concept of the utility model should be included in the protection scope of the utility model. Therefore, the protection scope is not limited to the above description.

Claims

1. A leak-proof high-pressure valve, comprising a valve stem and a valve plate installed in a valve body, with packing installed between the valve stem and the valve cover, characterized in that: The valve plate is a plate-like body with a liquid flow port and the mating surface between it and the valve seat is a plane; the lower end of the valve stem is provided with an anti-detachment connector, which is connected to the valve plate; the outer diameter of the anti-detachment connector is larger than the inner diameter of the center hole of the valve cover, and an anti-puncture sealing ring is provided on the upper part of the anti-detachment connector.

2. A leak-proof high-pressure valve as claimed in claim 1, characterized in that: The anti-drop connection head is a plate structure and valve stem connection clamps are provided on both sides of the middle of the plate structure, and the valve stem connection clamps are connected to the valve plate clamping groove in the valve plate.

3. A leak-proof high-pressure valve as claimed in claim 2, characterized in that: The upper body of the valve plate is a U-shaped groove, and the valve plate clamping groove is arranged inside the groove body of the U-shaped groove; the thickness of the valve stem connecting clamping platform arranged in the anti-detachment connecting head is consistent with the depth of the valve plate clamping groove in the valve plate.

4. The anti-leakage high-pressure valve according to claim 1, characterized in that: The anti-puncture leakage sealing ring is installed in the anti-puncture leakage ring groove at the upper end of the anti-detachment connector; the groove body of the anti-puncture leakage ring groove is a V-shaped groove with upper and lower relative inclined surfaces, and the anti-puncture leakage sealing ring is installed in the groove between the upper and lower relative inclined surfaces.

5. A leak-proof high-pressure valve as claimed in claim 4, characterized in that: The outer diameter of the upper inclined surface of the V-shaped groove in the anti-puncture leakage ring groove is equal to the outer diameter of the valve stem; the outer diameter of the lower inclined surface of the V-shaped groove in the anti-puncture leakage ring groove is equal to the outer diameter of the anti-detachment connector and the lower inclined surface of the V-shaped groove is a finely machined sealing surface, which matches the lower chamfer of the lower end of the center hole of the valve cover.

6. The anti-leakage high-pressure valve according to claim 1, characterized in that: The packing that is sleeved outside the valve stem and installed in the valve cover is a double sealing filler. The longitudinal section of the packing wall is U-shaped. The double sealing filler consists of a filling core and an outer sealing sleeve. The filling core is filled in the filling groove in the outer sealing sleeve sealed at the lower end.

7. A leak-proof high-pressure valve as claimed in claim 6, characterized in that: The filling core of the packing is made of rubber material, the outer sealing sleeve is made of polymer composite nano material, and a gasket is arranged below the packing and between the valve stem and the valve cover; the openings of the filling core and the outer sealing sleeve face upward.

8. The anti-leakage high-pressure valve according to claim 1, characterized in that: A booster spring is also installed between the main body and the valve seat at the periphery of the liquid flow hole in the valve body, and a guide ring is installed at the periphery of the fitting surface between the valve seat and the valve stem; the booster spring is a wave spring, and the outer diameter of the guide ring is larger than the outer diameter of the valve seat and has an interference fit with the valve seat.

9. The anti-leakage high-pressure valve according to claim 1, characterized in that: A grease injection hole radially penetrating the center hole of the valve cover is provided in the body of one side of the valve cover, and a grease injection nozzle is installed at the outer end of the grease injection hole; a pressure measuring and pressure relief hole radially penetrating the center hole of the valve cover is provided in the valve cover on the other side where the grease injection nozzle is installed, and a pressure measuring and pressure relief nozzle is installed at the outer end of the pressure measuring and pressure relief hole; a pressure gauge or a pressure relief valve can be connected to the pressure measuring and pressure relief nozzle.

10. A packing disassembly and assembly tool for a leak-proof high-pressure valve according to any one of claims 1 to 9, characterized in that: A handle and a connecting rod are provided, wherein: the connecting rod is connected to the handle, the lower part of the connecting rod is a threaded hook cone, and a lower oblique hook mouth is provided in the lower cone of the hook cone; the maximum outer diameter of the hook cone is equal to or less than the width of the filling core in the packing.

Images