A socket-sealed gate valve

Abstract

This utility model relates to a socket-sealed gate valve, comprising a socket valve body, a socket rubber ring, a pipeline, and a valve seat for the valve body sealing surface. The socket valve body has socket structures at both ends, and an annular groove on its inner wall to accommodate the socket rubber ring. The socket rubber ring has two oblique protrusions inside to enhance the sealing effect. The pipeline uses standard steel pipe or PVC pipe. The valve seat for the valve body sealing surface is fixed to the socket valve body by compression and is replaceable. The gate, valve stem, and valve cover constitute the valve's opening and closing mechanism. This gate valve achieves quick assembly / disassembly and reliable sealing through its special socket structure and the socket rubber ring with oblique protrusions.

Description

Technical Field

[0001] This utility model belongs to the field of valve technology, specifically a socket hard seal gate valve. Background Technology

[0002] Socket-sealed gate valves are important control devices in pipeline systems. They employ a socket connection method, offering advantages such as convenient installation and small footprint, making them suitable for scenarios requiring rapid assembly or where space is limited. However, existing socket-sealed gate valves have shortcomings in practical use, failing to meet the demands of modern industry for highly efficient and reliable valves.

[0003] In the prior art, patent CN101424354B discloses a socket-type double-sealed gate valve for gas. This design incorporates sealing grooves and pipe seals in the medium inlet and outlet sections of the valve body flow channel, along with a pipe clamping device, to prevent gas leakage and address structural detachment and leakage issues under high pressure. However, this design primarily relies on an elastic seated seal structure, and its sealing performance may decline under long-term high-pressure conditions due to aging or wear of the sealing material, resulting in reduced sealing effectiveness. Furthermore, the installation and adjustment of the pipe clamping device are complex, increasing maintenance costs and operational difficulty. In scenarios with frequent opening and closing, its service life and reliability are limited.

[0004] Another patent, CN109059999B, discloses a backflush measuring device and its usage method. It uses a socket-welded gate valve as a key component, employing a pressure gauge or transmitter to diagnose pipeline faults and provide troubleshooting and maintenance methods. However, the socket-welded gate valve in this design is primarily used for auxiliary functions and is not optimized for hard-seal structures. This results in insufficient sealing performance and durability when facing high-temperature, high-pressure, or corrosive media. This design focuses on measurement and maintenance functions, without in-depth exploration of structural improvements and performance enhancements to the socket-welded gate valve itself, making it difficult to meet the industrial requirements for high sealing performance and long service life.

[0005] Therefore, existing socket-sealed gate valves need improvement in sealing performance, durability, and ease of maintenance, especially under complex operating conditions such as high temperature, high pressure, and corrosive media, where traditional designs struggle to provide reliable sealing and long service life. This invention aims to solve these problems. Utility Model Content

[0006] This utility model provides a socket hard seal gate valve to solve the technical problems of existing socket gate valves, such as the decline in sealing performance due to aging or wear of sealing materials under long-term high-pressure conditions, the complexity of installation and adjustment of pipeline clamping devices, and the difficulty of adapting traditional soft seal structures to working conditions containing particulate or corrosive media.

[0007] To solve the above problems, the present invention provides a socket-sealed gate valve with the following technical solution: A socket-sealed gate valve includes a socket valve body, a socket rubber ring, a pipeline, and a valve seat for the valve body sealing surface. Both ends of the socket valve body are configured with socket structures, the head dimensions of which are designed according to relevant pipeline standards to facilitate pipeline disassembly. The socket rubber ring is disposed inside the grooves at both ends of the socket valve body and tightly fits against the valve body wall. The socket rubber ring has two oblique protrusions inside, which enhance the sealing effect at the rubber ring interface under pipeline pressure. The pipeline uses standard steel pipe or polyvinyl chloride pipe, which mates with the socket structures at both ends of the socket valve body. The valve seat for the valve body sealing surface is installed inside the socket valve body using a replaceable extrusion sleeve structure. When the sealing surface is worn, the valve seat can be replaced without replacing the entire valve.

[0008] The socket structure of the valve body includes sockets at both ends, with annular grooves on the inner walls of these sockets to accommodate a socket rubber ring. The socket dimensions match the outer diameter of a standard pipe, ensuring quick insertion and fixation of the pipe. The socket rubber ring is made of an elastic material, and its cross-sectional shape includes two inwardly protruding oblique protrusions. These oblique protrusions deform radially under pressure from the medium inside the pipe to enhance the sealing contact area. The outer circumferential surface of the socket rubber ring fits tightly against the inner wall of the socket valve body groove, and the inner circumferential surface of the socket rubber ring forms a sealing fit with the outer wall of the pipe.

[0009] The valve body sealing surface is fixed to the inner wall of the flow channel of the socket valve body by a valve seat through compression. The valve seat is made of rigid material, and its outer surface has an annular flange, which forms an interference fit with the corresponding groove on the inner wall of the socket valve body. The inner surface of the valve seat forms a gate sealing surface, which is precision machined to ensure a hard seal fit with the gate. The valve seat has disassembly slots at both axial ends to facilitate the installation and disassembly of the valve seat using tools.

[0010] The socket-sealed gate valve further includes a gate, a valve stem, and a valve cover. The gate is disposed within the flow channel of the socket valve body, and its sealing surface mates with the inner bore surface of the valve seat. One end of the valve stem is connected to the gate, and the other end extends through the valve cover to the outside. The valve cover is fixed to the top opening of the socket valve body with bolts, and a sealing packing gland is provided inside the valve cover for dynamic sealing of the valve stem.

[0011] As a further improvement, the two oblique protrusions of the socket ring are continuously arranged along the circumference of the ring, and the two oblique protrusions are inclined in opposite directions and symmetrically distributed. The top of each oblique protrusion is an arc-shaped structure, and the radius of curvature of the arc-shaped structure is smaller than the radius of curvature of the outer wall of the pipe, so that there is a small gap between the socket ring and the pipe under no pressure, while under pressure, the gap disappears and a tight seal is formed.

[0012] As a further improvement, the inner walls of the sockets at both ends of the valve body are provided with multiple annular grooves, each groove containing a socket rubber ring. These multiple socket rubber rings are arranged at intervals along the pipeline axial direction, forming a multi-layer sealing structure. The spacing between adjacent socket rubber rings is equal, and this spacing is greater than the axial width of a single socket rubber ring.

[0013] As a further improvement, the annular flange cross-section of the valve seat on the valve body sealing surface is trapezoidal, with the larger end of the trapezoidal structure facing the valve seat mounting direction. The corresponding groove on the inner wall of the valve body has a trapezoidal cross-section that matches the annular flange of the valve seat, allowing the valve seat to expand radially under axial pressure, thereby enhancing the fixing effect between it and the valve body.

[0014] As a further improvement, the valve seat's disassembly groove on the valve body sealing surface consists of two symmetrically arranged axial blind holes, the inner walls of which are provided with anti-slip textures. The line connecting the centers of the two blind holes passes through the axis of the valve seat, and the depth of the blind holes is greater than half the thickness of the valve seat.

[0015] As a further improvement, the socket end of the valve body is provided with a guide slope, the angle of which is fifteen to twenty degrees. The height of the guide slope gradually decreases inward from the valve body end, forming a flared structure to facilitate pipe insertion.

[0016] As a further improvement, the socket ring is made of corrosion-resistant synthetic rubber with a hardness ranging from 70 to 80 on the Shore A scale. A V-shaped groove is formed between the two oblique protrusions of the socket ring, and the thickness of the bottom of the V-shaped groove is less than the thickness of the top of the protrusion.

[0017] As a further improvement, the hard material of the valve seat used for the valve body sealing surface is stainless steel or hard alloy, and its sealing surface is ground to a surface roughness of no more than 0.4 micrometers. The inner diameter of the valve seat is consistent with the flow channel diameter of the socket valve body, and the axial length of the valve seat is 1.2 to 1.5 times its inner diameter.

[0018] As a further improvement, the inner wall of the flow channel of the socket valve body is provided with an annular shoulder at the valve seat mounting position, and the end face of the annular shoulder contacts the end face of the valve seat. The height of the annular shoulder is two to three millimeters, and its outer diameter is the same as the outer diameter of the valve seat.

[0019] As a further improvement, the fit between the socket rubber ring and the groove of the socket valve body is an interference fit, with an interference amount of 0.5 to 1 mm. The outer diameter of the socket rubber ring in its free state is larger than the inner diameter of the groove, while in the installed state, the socket rubber ring is subjected to radial compression.

[0020] The beneficial effects of this invention are reflected in the following aspects:

[0021] This utility model of a socket-sealed gate valve achieves rapid assembly and disassembly of pipeline connections and reliable sealing through a special socket structure design at both ends of the socket valve body and a socket rubber ring with an internal oblique protrusion. The replaceable hard-seal valve seat structure significantly improves the valve's sealing performance and service life under conditions containing particles or corrosive media. The overall structure is compact and reasonable, maintenance is convenient, and operating costs are effectively reduced, thus having a positive effect on improving the reliability and economy of industrial pipeline systems. Attached Figure Description

[0022] Figure 1 This is a schematic diagram of the overall structure of a socket-sealed gate valve according to the present invention;

[0023] Figure 2 This is a partially enlarged schematic diagram of the socket structure of a socket-sealed gate valve according to an embodiment of this application;

[0024] Figure 3 This is an exploded structural diagram of a socket-sealed gate valve according to the present invention.

[0025] Figure 4 This is a schematic diagram of the valve seat structure for the valve body sealing surface according to an embodiment of this application;

[0026] Figure 5 This is a schematic diagram of the cross-section of the socket rubber ring of a socket hard seal gate valve according to the present invention;

[0027] Explanation of reference numerals in the attached drawings: 1. Socket valve body; 2. Socket rubber ring; 3. Pipeline; 4. Valve seat for valve body sealing surface; 5. Gate; 6. Valve stem; 7. Valve cover; 8. Socket; 9. Slanted protrusion; 10. Annular groove; 11. Annular flange; 12. Groove for disassembly; 13. Guide slope; 14. V-groove; 15. Annular shoulder. Detailed Implementation

[0028] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Those skilled in the art should understand that the embodiments described below are only some, not all, of the embodiments of the present utility model. All other embodiments obtained by those skilled in the art based on the embodiments of the present utility model without creative effort are within the scope of protection of the present utility model.

[0029] First embodiment

[0030] Please see Figures 1 to 5As shown, the present invention provides a socket-sealed gate valve, the overall structure of which includes a socket valve body 1, several socket rubber rings 2, several pipes 3, two valve seats 4 for valve body sealing surfaces, a gate 5, a valve stem 6, and a valve cover 7. These core components, through precise mechanical structure design and coordinated operation, together constitute a fully functional gate valve device.

[0031] Specifically, the socket valve body 1, as the main load-bearing component of the entire gate valve, is typically integrally cast from high-strength, high-toughness ductile iron (e.g., grade QT450-10) with good casting properties. Alternatively, in applications requiring superior corrosion resistance, it may be manufactured from stainless steel (e.g., grade CF8M) through precision casting or forging. The socket valve body 1 has a hollow cylindrical shape with a through-flow channel inside. The inner wall surface of this channel is precision-machined to ensure smooth fluid flow. Both ends of the socket valve body 1 extend outwards to form a pair of sockets 8. The external dimensions of the sockets 8 are designed to conform to relevant piping standards (e.g., ISO 4422 or GB / T 10002.1) to facilitate quick and convenient connection and disassembly with external pipes 3. The inner wall of the socket 8 is a smooth cylindrical structure with a surface roughness (Ra value) strictly controlled to no more than 1.6 micrometers to ensure the quality of fit with the socket ring 2 and the pipe 3. The inner diameter tolerance grade of the socket 8 is set to H7. Along the axial direction of the socket valve body 1, at least one annular groove 10 is provided on the inner wall of each socket 8. In this embodiment, each socket 8 of the socket valve body 1 has two annular grooves 10 arranged at intervals along the axial direction of the socket valve body 1, thereby forming a multi-seal structure. The axial spacing between adjacent annular grooves 10 is equal, and the spacing value is slightly larger than the axial width of a single socket ring 2, ensuring that each socket ring 2 can independently perform a sealing function. The width and depth of the annular grooves 10 are precisely designed, and their dimensional tolerances are strictly controlled to ensure that the socket ring 2 can be tightly and stably accommodated. The inner wall of the annular groove 10 and the outer circumferential surface of the socket ring 2 form an interference fit, with the specific interference amount designed to be between 0.5 mm and 1 mm. This means that the outer diameter of the socket ring 2 in its free state is larger than the inner diameter of the annular groove 10. During installation, the socket ring 2 is radially compressed, thus being firmly fixed inside the annular groove 10 and forming an initial pre-tight seal. The outermost end of the socket port 8 of the socket valve body 1 tapers radially inward to form a conical guide slope 13. The angle of the guide slope 13 is designed to be between 15 and 20 degrees, and its height gradually decreases inward from the end face of the valve body 1, forming a trumpet-shaped structure. The surface finish of the guide slope 13 is high, and its angle tolerance is controlled within ±0.5 degrees, aiming to provide a smooth transition area, which greatly facilitates the alignment and guidance of the pipe 3 when it is inserted into the socket port 8 of the socket valve body 1.

[0032] Inside the flow channel of the socket valve body 1, at the mounting position of the valve seat 4 on the valve body sealing surface, an annular shoulder 15 is provided. The height of the annular shoulder 15 is two to three millimeters, and its outer diameter is precisely the same as the outer diameter of the valve seat 4 on the valve body sealing surface. The end face of the annular shoulder 15 is precision ground, with a flatness tolerance controlled within 0.02 millimeters to ensure tight and reliable axial contact with the end face of the valve seat 4 on the valve body sealing surface, providing stable axial positioning and support for the valve seat 4 on the valve body sealing surface. The top of the socket valve body 1 has an opening, around which are multiple evenly distributed threaded holes for fixed connection with the valve cover 7 by bolts. The thread accuracy grade of these threaded holes is 6H to ensure the reliability of the bolt connection.

[0033] The socket ring 2, as a key elastic element for fluid sealing in the socket connection, is made of synthetic rubber with excellent corrosion resistance, high elasticity, and good aging resistance, such as nitrile rubber (NBR) or ethylene propylene diene monomer (EPDM), with a Shore hardness range of 70 to 80 degrees. The physical properties of the socket ring 2 include, but are not limited to: tensile strength not less than 15 MPa, elongation at break not less than 300%, and compression set not greater than 25% under specified temperature and time conditions, to ensure stable sealing performance and service life under long-term high-pressure conditions. The cross-sectional shape of the socket ring 2 is uniquely designed, containing two continuously arranged oblique protrusions 9 along the circumference of the ring on its inner circumference. These two oblique protrusions 9 are symmetrically distributed with opposite inclination directions, each protruding radially towards the center of the socket ring 2, forming two independent sealing lips. Each inclined protrusion 9 has a top designed as an arc shape with a radius of curvature ranging from 0.5 mm to 1.5 mm, smaller than the radius of curvature of the outer wall of the pipe 3. This design creates a small radial gap between the inner circumferential surface of the socket ring 2 and the outer wall of the pipe 3 in its free state, facilitating the smooth insertion of the pipe 3. A V-groove 14 is formed between the two inclined protrusions 9 of the socket ring 2, with the bottom thickness of the V-groove 14 being less than the thickness of the top of the inclined protrusion 9. The groove angle of the V-groove 14 is 30 to 45 degrees, and its depth matches the height of the inclined protrusion 9. This structure enhances the elastic deformation capacity and sealing effect of the inclined protrusion 9 under radial pressure. When the pipe 3 is inserted into the socket 8 and subjected to internal medium pressure, the medium pressure forces the inclined protrusion 9 to undergo radially inward elastic deformation. Its arc-shaped top fits tightly against the outer wall of the pipe 3, thereby significantly increasing the sealing contact area and forming a reliable self-tightening seal. The outer circumferential surface of the socket rubber ring 2 fits tightly against the inner wall surface of the annular groove 10 of the socket valve body 1. The socket rubber ring 2 is pre-compressed during installation, and its outer diameter in the free state is 0.5 mm to 1 mm larger than the inner diameter of the annular groove 10.

[0034] The pipe 3 is made of steel or polyvinyl chloride (PVC) pipe conforming to national or international standards, and its outer diameter is precisely matched to the inner diameter tolerance of the socket 8 of the socket valve body 1. One end of the pipe 3 is inserted into the socket 8 of the socket valve body 1, forming a dynamic seal with the socket rubber ring 2. The inserted end of the pipe 3 is usually chamfered to facilitate its smooth passage through the guide slope 13 of the socket valve body 1 and the beveled protrusion 9 of the socket rubber ring 2.

[0035] The valve seat 4 for the valve body sealing surface is the core component for realizing the hard seal structure of this utility model. It is made of materials with extremely high hardness, excellent wear resistance, and superior corrosion resistance, such as austenitic stainless steel (e.g., 316L stainless steel, grade CF8M) or higher-performance cobalt-based hard alloys (e.g., Stellite 6), where Stellite 6 has a Mohs hardness of HRC40-50. The valve seat 4 for the valve body sealing surface is precisely fixed to the inner wall of the flow channel of the socket valve body 1 by a compression fitting. The overall structure of the valve seat 4 for the valve body sealing surface is annular, with a continuous annular flange 11 on its outer surface. The cross-section of the annular flange 11 is trapezoidal, with the larger end of the trapezoid facing the installation direction of the valve seat 4 for the valve body sealing surface. The ratio of the smaller side to the larger side of the trapezoid is approximately 0.8, and the angle between the inclined plane of the trapezoid and the axis is 15 degrees. The inner wall of the flow channel of the socket valve body 1 has an annular groove at a corresponding position that precisely matches the trapezoidal shape and size of the annular flange 11. This groove also has a trapezoidal cross-section and forms an interference fit with the annular flange 11, with a fit grade of H7 / p6. During the installation of the valve seat 4 on the valve body sealing surface, through special tooling or thermal expansion and contraction processes, the annular flange 11 and the corresponding annular groove of the socket valve body 1 form a tight interference fit. Under axial pressing and radial constraint, the annular flange 11 of the valve seat 4 on the valve body sealing surface is radially expanded and firmly stuck in the groove of the socket valve body 1, thereby enhancing the fixing effect and sealing reliability between it and the socket valve body 1. The inner bore surface of the valve seat 4 forms the sealing surface of the gate 5. This sealing surface undergoes extremely precise grinding, with its surface roughness (Ra value) strictly controlled to be no greater than 0.4 micrometers, and even reaching 0.2 micrometers, to ensure a mirror-like hard seal with the sealing surface of the gate 5. The inner bore diameter of the valve seat 4 matches the flow channel diameter of the socket valve body 1, ensuring that there is no unnecessary throttling or turbulence when the fluid passes through the valve. The axial length of the valve seat 4 is designed to be 1.2 to 1.5 times its inner bore diameter. For example, when the inner bore diameter is 50 mm, the axial length is designed to be 60 mm to 75 mm to provide sufficient sealing contact area and structural strength. To facilitate the installation and removal of the valve seat 4, symmetrical removal slots 12 are provided at both axial ends. The disassembly slot 12 consists of two symmetrically arranged axial blind holes. The diameter of each blind hole is five to eight millimeters, and its depth is greater than half the thickness of the valve seat 4 used for the valve body sealing surface, typically ten to fifteen millimeters. The inner wall of each blind hole has anti-slip textures, such as fine knurling or axial straight lines, to facilitate the insertion of a special tool and the application of torque for screwing the valve seat 4 into or out of the valve body sealing surface. The center line connecting the two blind holes precisely passes through the axis of the valve seat 4 used for the valve body sealing surface, ensuring balanced force distribution.

[0036] The gate 5 is disposed inside the flow channel of the socket valve body 1. Its structure is typically a wedge-shaped gate or a parallel gate, used to cut off or connect the medium flow when the valve is opened and closed. Both sealing surfaces of the gate 5 are hardened, for example, by overlaying cobalt-based alloy (Stellite) and precision grinding, with a surface roughness consistent with that of the valve seat 4, ensuring a tight hard seal between them. The lower end of the gate 5 is typically V-shaped or arc-shaped to better cut off the medium flow during closing. The upper end of the gate 5 is fixedly connected to the lower end of the valve stem 6 via a mechanical connection such as a T-slot or thread. When the valve stem 6 moves axially, the gate 5 moves smoothly in a straight line under the guidance of a guide groove or guide post inside the flow channel of the socket valve body 1. The clearance fit of the gate 5's guide mechanism is H9 / f8, ensuring that it does not jam during movement and maintains good positioning accuracy.

[0037] The valve stem 6 is used to transmit external operating force, driving the gate 5 to move up and down. One end of the valve stem 6 is connected to the gate 5 by a mechanical connection (e.g., a T-connection or a pin connection), and the other end extends through the valve cover 7 to the outside, typically connected to a handwheel, gearbox, or electric actuator. The valve stem 6 is typically made of austenitic stainless steel (e.g., 304 or 316 stainless steel) with high strength, high rigidity, and good corrosion resistance, and its tensile strength is not less than 500 MPa. The portion of the valve stem 6 that passes through the valve cover 7 typically uses a trapezoidal thread or an Acram thread with a thread accuracy grade of 7e and an optimized pitch to ensure high transmission efficiency and smooth operation. The mating part of the valve stem 6 and the valve cover 7 is precision machined with a high surface finish to reduce frictional resistance with the packing.

[0038] The valve cover 7 is installed at the top opening of the socket valve body 1 and is typically made of the same material as the socket valve body 1. The valve cover 7 is fixedly connected to the top flange face of the socket valve body 1 by multiple high-strength bolts (e.g., grade 8.8). A static sealing gasket, made of flexible graphite, polytetrafluoroethylene (PTFE), or metal spiral wound gasket, with a thickness of two to three millimeters, is typically placed between the connection surfaces of the valve cover 7 and the socket valve body 1 to ensure reliable sealing at the connection under various operating conditions. Inside the valve cover 7 is a sealing stuffing box for the valve stem 6. The sealing stuffing box contains a set of packing rings made of flexible graphite, PTFE, or aramid fiber, with five to seven layers, their cross-sectional dimensions precisely matching the annular space inside the stuffing box. These packing rings surround the valve stem 6 and apply axial pressure through a gland and multiple clamping bolts, thereby forming a reliable dynamic seal for the valve stem 6 during movement, effectively preventing leakage of the internal medium from the connection between the valve stem 6 and the valve cover 7. The depth and diameter of the stuffing box are carefully designed to accommodate a sufficient number of packing rings and ensure uniform application of clamping force. The radial clearance between the gland and the stuffing box wall is controlled within 0.1 mm. A handwheel or actuator mounting base can also be provided on the outside of the valve cover 7 for connecting external operating devices.

[0039] This utility model's socket-sealed gate valve, through the ingenious combination and synergistic effect of the aforementioned structural features, achieves rapid, convenient, and highly reliable sealing at the socket connection point for pipeline connections. Simultaneously, the replaceable hard-seal valve seat structure significantly improves the valve's sealing performance and service life when handling media containing particles, abrasives, or corrosives. The overall structure is compact and reasonable, easy to maintain, and effectively reduces the valve's lifecycle cost, thus playing a positive role in improving the operational reliability and economy of industrial pipeline systems.

[0040] In another embodiment of this utility model,

[0041] The inner walls of the socket ports 8 at both ends of the socket valve body 1 can be designed to contain a greater number of annular grooves 10 according to specific operating conditions. For example, three or four annular grooves 10 can be provided, with one socket rubber ring 2 installed in each annular groove 10. This arrangement of multiple socket rubber rings 2 can further enhance the sealing reliability and redundancy of the socket connection, ensuring that even if one seal fails, the remaining seals can still function effectively. The axial width and depth of each annular groove 10, as well as the axial spacing between adjacent annular grooves 10, are optimized based on the size, elastic characteristics, and medium pressure of the socket rubber ring 2 to ensure that each socket rubber ring 2 can independently or collaboratively generate effective radial sealing deformation and achieve its own self-tightening sealing function when subjected to medium pressure. The remaining structural features of the socket valve body 1, including its material, flow channel design, guide slope 13, and annular shoulder 15, are basically the same as those described in the first embodiment and will not be repeated here.

[0042] In another embodiment of this utility model,

[0043] The cross-sectional structure of the annular flange 11 of the valve seat 4 for the valve body sealing surface can be finely adjusted while maintaining the interference fit principle between it and the socket valve body 1. For example, the annular flange 11 can be designed as a rectangular cross-section with a small chamfer angle of five to ten degrees, forming a tight transition fit or a small interference fit with the corresponding annular groove on the inner wall of the socket valve body 1. In this structural variation, the axial fixation of the valve seat 4 for the valve body sealing surface can also be achieved by adding several evenly distributed threaded holes to the inner wall of the flow channel of the socket valve body 1 and screwing in positioning screws or pressure rings to increase the fixing strength and disassembly. The material of the positioning screws or pressure rings can be stainless steel, which is compatible with the material of the valve body 1 and has good corrosion resistance. The remaining structural features of the valve seat 4 for the valve body sealing surface, including its hard material, sealing surface roughness, inner hole diameter, and the design and size of the disassembly slot 12, are consistent with the description of the first embodiment and will not be repeated here.

[0044] In yet another embodiment of this utility model,

[0045] The material selection of the socket rubber ring 2 can be more precisely adjusted according to the specific properties of the transported medium and the operating temperature range. For example, when the medium is a strong oxidizing acid, strong alkali, or high-temperature medium, the socket rubber ring 2 can be made of perfluoroether rubber (FFKM) or polytetrafluoroethylene (PTFE) composite material to provide better chemical corrosion resistance and temperature resistance. Simultaneously, the Shore hardness range of the socket rubber ring 2 can also be finely adjusted according to changes in pipeline pressure. For example, under ultra-high pressure conditions, the hardness of the rubber ring can be appropriately increased to 85 to 90 degrees to prevent excessive deformation under high pressure, which could lead to sealing failure. The arc-shaped structure design of the two oblique protrusions 9 of the socket rubber ring 2, the design of the V-groove 14, and the fitting method with the annular groove 10 of the socket valve body 1 are basically the same as described in the first embodiment, ensuring its self-tightening sealing characteristic under pressure. The remaining structural features of the socket rubber ring 2, including its shape, size, and sealing relationship with the pipeline 3, are basically the same as in the first embodiment and will not be described in detail here.

[0046] In another example of this utility model,

[0047] The valve stem 6 and the gate 5 can be connected using a pin connection structure. Specifically, the upper end of the gate 5 has a pin hole extending through its width, and the lower end of the valve stem 6 is designed as a two-lobed fork structure, the width of which matches the width of the upper end of the gate 5. A precision-machined pin passes through the fork structure of the valve stem 6 and the pin hole of the gate 5, and is fixed axially by a cotter pin or elastic retaining ring, thereby achieving a firm connection between the valve stem 6 and the gate 5. This pin connection method allows for a certain degree of relative rotational freedom between the valve stem 6 and the gate 5, helping to eliminate eccentric loads or installation errors that may occur during the raising and lowering of the valve stem 6, ensuring the smoothness of the gate's movement. The portion of the valve stem 6 extending outward through the valve cover 7 can be designed with a threaded structure and threadedly connected to the internal thread of an external operating mechanism (such as a handwheel, gearbox, or electric actuator). The rotational movement of the external operating mechanism converts the rotation into the axial linear movement of the valve stem 6, thereby driving the gate 5 to rise and fall. The structure of the sealing packing gland inside the valve stem 6 and the valve cover 7, as well as the structure of the socket valve body 1, the socket rubber ring 2, the pipe 3 and the valve seat 4 for the valve body sealing surface, are consistent with the description of the first embodiment, and will not be repeated here.

[0048] Furthermore,

[0049] The outer diameter of the socket 8 of the valve body 1 can be customized according to different national or industry standards. For example, it can match various nominal pipe diameter specifications such as DN50, DN80, DN100, DN150, and DN200 to meet the needs of a wide range of industrial applications. The external structure of the valve body 1 is typically designed with reinforcing ribs to enhance its overall mechanical strength and rigidity. Especially in the transition area between the socket 8 and the valve body, the reinforcing ribs effectively disperse stress, improving the valve body's compressive strength and bending strength. The cross-sectional shape of the reinforcing ribs can be rectangular, trapezoidal, or arc-shaped, and their size and arrangement are optimized through finite element analysis to ensure optimal structural performance with minimal material consumption. The internal surface of the flow channel of the valve body 1, especially the parts in long-term contact with the medium, can be treated with an anti-corrosion coating, such as an epoxy resin coating or fiberglass lining, to further improve its chemical corrosion resistance and wear resistance, extending the valve's service life in harsh media environments. The coating is typically between 0.2 mm and 0.5 mm thick, with a smooth and flat surface to ensure minimal fluid resistance and prevent media adhesion.

[0050] also,

[0051] The structure of the gate 5 can be further optimized to enhance its wear resistance and maintainability. For example, the sealing surface of the gate 5 can adopt a detachable inlay structure. Specifically, rectangular or dovetail grooves are designed on both sides of the gate 5, and hard sealing rings are inlaid in the grooves. These sealing rings can be made of the same or similar cobalt-based alloy material as the valve seat 4 of the valve body sealing surface, and are firmly fixed to the gate 5 by interference fit, micro-thread connection or pin fixing. When the sealing rings wear due to long-term use, only the worn sealing rings need to be replaced, instead of replacing the entire gate 5, which greatly simplifies the maintenance process and significantly reduces spare parts costs. The guiding mechanism of the gate 5 can also be enhanced, for example, by symmetrically providing two T-shaped or dovetail guide grooves on the inner wall of the flow channel of the socket valve body 1, and corresponding guide protrusions that cooperate with the guide grooves on both sides of the gate 5. These guide grooves and guide protrusions are precision-machined, with the clearance controlled to between 0.1 mm and 0.2 mm, ensuring that the gate 5 can move smoothly and accurately during lifting and lowering, effectively preventing jamming or skew. The guide protrusions can be made of self-lubricating materials, such as oil-impregnated nylon or polyethylene, to reduce frictional resistance and extend service life.

[0052] Furthermore,

[0053] In addition to the bolt fixing method described in the first embodiment, the connection between the valve cover 7 and the socket valve body 1 can also be a flange connection. An annular flange is provided at the bottom of the valve cover 7, and a matching annular flange is also provided around the top opening of the socket valve body 1. Multiple evenly distributed bolts pass through the flange holes and are tightened evenly with nuts to form a robust and detachable connection structure. A static sealing gasket made of materials such as rubber, graphite, or metal-wound graphite is typically placed between the flange connection surfaces. The compression ratio and hardness of the gasket are precisely selected according to the operating conditions (e.g., pressure, temperature, and media type) to ensure reliable sealing at the connection point under different media and pressure conditions. A valve position indicator can also be integrated into the exterior of the valve cover 7, displaying the open or closed position of the gate 5 in real time via a mechanical linkage mechanism. This indicator can be a graduated pointer, a digital display device, or a simple lifting lever, providing operators with intuitive and accurate valve status information, thus improving operational safety and convenience. The linkage mechanism of the indicator is usually composed of gears, connecting rods or lead screw and nut pairs, and its transmission accuracy ensures that the valve position display is highly consistent with the actual position of the gate.

[0054] Through the above-described embodiments and more detailed structural features, this utility model comprehensively demonstrates its innovative design concepts and technical implementation methods in terms of socket connection, hard sealing performance, maintainability, and structural reliability. Its core lies in effectively solving the prominent problems encountered by traditional gate valves under specific operating conditions, such as sealing failure and complex maintenance, through ingenious mechanical structure design, high-quality material selection, and rigorous manufacturing processes. This greatly improves the overall performance of the gate valve and its application value in industrial pipeline systems.

Claims

1. A socket-sealed gate valve, characterized in that, The valve body includes a socket valve body (1), the two ends of which are configured as socket structures. The socket structure includes socket ports (8) provided at both ends of the valve body. The inner wall of the socket ports (8) is provided with annular grooves (10). The socket rubber ring (2) is disposed inside the annular groove (10) at both ends of the socket valve body (1). The outer peripheral surface of the socket rubber ring (2) is tightly fitted with the inner wall surface of the annular groove (10) of the socket valve body (1). The inner peripheral surface of the socket rubber ring (2) is provided with two oblique protrusions (9). Pipe (3), the pipe (3) is matched with the socket (8) at both ends of the socket valve body (1), and the inner circumferential surface of the socket rubber ring (2) is sealed with the outer wall surface of the pipe (3); A valve seat (4) for sealing the valve body is fixed to the inner wall of the flow channel of the valve body (1) by compression. The outer surface of the valve seat (4) for sealing the valve body is provided with an annular flange (11). The annular flange (11) and the corresponding groove of the inner wall of the valve body (1) form an interference fit. The inner hole surface of the valve seat (4) for sealing the valve body constitutes a gate sealing surface. Gate (5), the gate (5) is set in the flow channel of the socket valve body (1), and its sealing surface is matched with the inner hole surface of the valve seat (4) of the valve body sealing surface; Valve stem (6), one end of which is connected to gate (5); The valve cover (7) is fixed to the top opening of the socket valve body (1) by bolts. The other end of the valve stem (6) extends through the valve cover (7) to the outside. The valve cover (7) is provided with a sealing packing gland for dynamic sealing of the valve stem (6).

2. The socket-sealed hard-seal gate valve according to claim 1, characterized in that, The two oblique protrusions (9) of the socket rubber ring (2) are continuously arranged along the circumference of the rubber ring. The two oblique protrusions (9) are in opposite directions and symmetrically distributed. The top of each oblique protrusion (9) is an arc-shaped structure, and a V-shaped groove (14) is formed between the two oblique protrusions (9).

3. The socket-sealed hard-seal gate valve according to claim 2, characterized in that, The socket rubber ring (2) is made of corrosion-resistant synthetic rubber with a hardness range of 70 to 80 degrees Shore. The bottom thickness of the V-groove (14) is less than the top thickness of the inclined protrusion (9).

4. The socket-sealed hard-seal gate valve according to claim 1, characterized in that, The inner walls of the sockets (8) at both ends of the socket valve body (1) are provided with multiple annular grooves (10), and each annular groove (10) is equipped with a socket rubber ring (2). The multiple socket rubber rings (2) are arranged at intervals along the axial direction of the pipe (3), and the distance between adjacent socket rubber rings (2) is equal and greater than the axial width of a single socket rubber ring (2).

5. The socket-sealed hard-seal gate valve according to claim 1, characterized in that, The annular flange (11) of the valve seat (4) for the valve body sealing surface has a trapezoidal cross section. The large end of the trapezoidal structure faces the installation direction of the valve seat (4) for the valve body sealing surface. The corresponding groove of the valve body (1) has a trapezoidal cross section that matches the annular flange (11) of the valve seat.

6. The socket-sealed gate valve according to claim 1 or 5, characterized in that, The valve seat (4) for the valve body sealing surface is provided with disassembly slots (12) at both axial ends. The disassembly slots (12) are two symmetrically arranged axial blind holes. The center line connecting the two blind holes passes through the axis of the valve seat (4) for the valve body sealing surface, and the depth of the blind holes is greater than half the thickness of the valve seat (4) for the valve body sealing surface.

7. The socket-sealed gate valve according to claim 1, characterized in that, The socket (8) end of the valve body (1) is provided with a guide slope (13), the angle of the guide slope (13) is fifteen to twenty degrees, and the height of the guide slope (13) gradually decreases from the end of the valve body inward.

8. The socket-sealed hard-seal gate valve according to claim 1, characterized in that, The hard material of the valve seat (4) for the valve body sealing surface is stainless steel or hard alloy. Its sealing surface is ground and the surface roughness is no more than 0.4 micrometers. The inner diameter of the valve seat (4) for the valve body sealing surface is consistent with the flow channel diameter of the socket valve body (1). The axial length of the valve seat (4) for the valve body sealing surface is 1.2 to 1.5 times its inner diameter.

9. The socket-sealed gate valve according to claim 1, characterized in that, The inner wall of the flow channel of the socket valve body (1) is provided with an annular shoulder (15) at the valve seat (4) installation position on the valve body sealing surface. The end face of the annular shoulder (15) is in contact with the end face of the valve seat (4) on the valve body sealing surface. The height of the annular shoulder (15) is two to three millimeters, and its outer diameter is the same as the outer diameter of the valve seat (4) on the valve body sealing surface.

10. The socket-sealed gate valve according to claim 1, characterized in that, The fit between the socket rubber ring (2) and the annular groove (10) of the socket valve body (1) is an interference fit, with an interference amount of 0.5 to 1 mm. The outer diameter of the socket rubber ring (2) in the free state is larger than the inner diameter of the annular groove (10).

Images