Elastomeric wedge-type single disc gate valve

Abstract

The utility model relates to a kind of elastic wedge type single gate plate gate valves, including valve body, valve cover, elastic wedge type single gate plate and valve seat, valve cover is set on valve body;Valve seat is provided with wedge angle;Valve body is provided with guide convex rail inside;Elastic wedge type single gate plate is set between two valve seats with wedge angle, elastic wedge type single gate plate is provided with guide groove, elastic wedge type single gate plate is made relative lifting movement along guide convex rail by guide groove, so that the sealing surface of elastic wedge type single gate plate and the sealing surface of corresponding valve seat are attached to close or move away to open.Elastic groove structure is opened in the bottom of elastic wedge type single gate plate, and an elastic compensation gap structure is also processed in the middle position of gate plate upper end, the deformation of rigid gate plate is increased.The designed elastic single gate plate structure sealing surface deformation area increases, deformation is large and deformation is uniform, compensate the adverse factors such as processing deviation and deformation of sealing pair, ensure two sealing pair zero leakage.

Description

Technical Field

[0001] This invention belongs to the field of valve technology and relates to an elastic wedge single gate valve. Background Technology

[0002] With the continuous development and expansion of shipbuilding technology, and the needs of national defense and security, my country must continuously improve the overall combat capability of its ships, which places higher demands on the overall ship system.

[0003] Valves are crucial equipment in ship systems, and their performance and quality play a vital role in piping systems. The sealing performance, reliability, and low flow resistance of valves directly affect the reliability of the ship and even its combat effectiveness. Wedge gate valves consist of a gate and valve body forming two sealing surfaces. The gate moves perpendicular to the flow path axis to open or close the valve. Due to their simple structure, safety, reliability, and low fluid resistance, they are widely used in ship propulsion and safety systems such as water supply, compressed air, steam, and oil supply. With increasingly stringent national requirements for safety, environmental protection, energy conservation, and emission reduction, especially in special operating conditions such as the production and transportation of flammable, explosive, toxic, harmful, or radioactive media, stringent requirements are placed on the sealing performance of wedge gate valves. For marine flanged stainless steel gate valves, both sealing surfaces must be leak-free, making the sealing requirements even more stringent.

[0004] Wedge gate valves experience significant wear due to relative friction between the sealing surfaces during opening and closing. To improve the gate's service life and anti-scratch performance, a cobalt-chromium-tungsten hard alloy is welded onto the gate's base material. Wedge single-gate valves have two sealing surfaces and require high precision in the wedge angle, posing challenges to machining, grinding, assembly, and maintenance. Relying solely on the deformation of the rigid single-gate sealing surface to compensate for the errors caused by the aforementioned issues makes achieving zero leakage, especially difficult for large-diameter gate valves. Therefore, there is an urgent need for a marine-grade wedge single-gate valve with an elastic groove structure. Utility Model Content

[0005] To address the issue that existing wedge-type single-gate valves exhibit leakage on both sealing surfaces during actual production sealing tests and shipboard use, failing to meet the standard and actual operating condition requirements for zero leakage, this patent provides an elastic wedge-type single-gate valve. This valve incorporates two elastic groove structures on the A and B sides of the gate's two sealing surfaces, increasing the deformation of the sealing surfaces while ensuring the overall deformation and strength of the gate. Thus, when the valve is closed, the gate sealing surface deforms upon contact with the valve body sealing surface, ensuring a complete seal between the two sealing surfaces and achieving zero leakage.

[0006] This utility model is achieved through the following technical solution: A resilient wedge gate valve includes a valve body, a valve cover, a resilient wedge gate, and a valve seat. The valve cover is mounted on the valve body, and the valve body and the valve cover together form a pressure-bearing and sealing cavity inside the valve. The valve seat is symmetrically arranged along the center line of the valve body, and the valve seat is provided with a wedge angle; The valve body is provided with a guide rail; The elastic wedge gate is disposed between two valve seats with wedge angles. The elastic wedge gate is provided with a guide groove, which is adapted to the guide rail of the valve body. The elastic wedge gate moves up and down relative to the guide rail through the guide groove, so that the sealing surface of the elastic wedge gate is in contact with the sealing surface of the corresponding valve seat to achieve closure or moves in opposite directions to achieve opening.

[0007] As a further description of the above scheme, the bottom of the elastic wedge single gate is also symmetrically provided with elastic groove structures, and each elastic groove structure is provided with a predetermined distance from the sealing surface of the adjacent elastic wedge single gate; the sealing surface of the elastic wedge single gate is provided with a wedge angle α between it and the vertical axis, and the wedge angle α is adapted to the wedge angle of the valve seat.

[0008] As a further description of the above solution, the top of the elastic wedge-shaped single gate is provided with an elastic compensation gap structure, the elastic compensation gap structure coincides with the center line of the elastic wedge-shaped single gate, and the width of the elastic compensation gap structure is equal to the width of the elastic groove structure.

[0009] As a further description of the above scheme, each of the elastic wedge single gates is provided with a symmetrical arc-shaped protrusion structure on the center line. The arc-shaped protrusion structure extends along the height direction of the elastic wedge single gate, and the two arc-shaped protrusion structures enclose and form a hollow cavity that runs through the elastic wedge single gate from top to bottom.

[0010] The aforementioned resilient wedge gate valve further includes a valve stem, a square nut, and a square nut mounting and positioning hole. The upper part of the elastic wedge-type single gate is provided with a square nut mounting and positioning hole, which is coaxially arranged with the hollow cavity; the square nut is set in the square nut mounting and positioning hole. The lower end of the valve stem passes through the hollow cavity and is connected to the square nut via a trapezoidal thread. The center line of the valve stem is coaxial with the center line of the elastic wedge single gate. When the gate valve is opened or closed, rotating the valve stem drives the square nut, which in turn drives the elastic wedge single gate to move up and down.

[0011] The aforementioned resilient wedge gate valve further includes a stuffing box, packing, a packing gland, and a handwheel. The valve stem passes through the valve cover and contacts the packing in the stuffing box. By tightening the packing gland, the packing and valve stem are in close contact to form a dynamic seal structure. A handwheel is provided at the top of the valve stem.

[0012] As a further description of the above scheme, the valve cover and the valve body are connected by a flange; the sealing surface of the elastic wedge single gate is ground, and the surface roughness Ra of the sealing surface of the elastic wedge single gate is ≤0.4μm.

[0013] As a further description of the above solution, the upper part of the elastic wedge-shaped single gate is provided with a through groove structure formed by milling along the radial direction. The through groove structure is completely through in a direction perpendicular to the sealing surface of the elastic wedge-shaped single gate. The through groove structure is located below the elastic compensation gap structure and is not through the elastic compensation gap structure at a preset distance. The through groove structure makes the upper part of the elastic wedge-shaped single gate form a two-lobed structure that is symmetrical from left to right. The center line of symmetry of the two-lobed structure coincides with the center line of the elastic wedge-shaped single gate.

[0014] This utility model has the following beneficial effects: 1. This utility model utilizes the synergistic effect of the elastic groove structure at the bottom and the elastic compensation gap structure at the top of the elastic wedge-shaped single gate to compensate for processing or assembly errors through micro-deformation, ensuring that the sealing surface of the elastic wedge-shaped single gate and the sealing surface of the valve seat are evenly fitted, forming a stable sealing pressure and effectively preventing media leakage. In addition, the matching design of the wedge angle α between the sealing surface of the elastic wedge-shaped single gate and the valve seat further enhances the tightness of the sealing surface, making it particularly suitable for high-pressure and leakage-prone working conditions.

[0015] 2. This utility model uses the guide rail of the valve body and the guide groove of the elastic wedge gate to precisely match, forcibly restricting the elastic wedge gate to only move up and down along the axial direction, thus completely avoiding the problems of gate skewing and jamming; at the same time, the precise guidance ensures that the gate sealing surface and the valve seat sealing surface always remain parallel and aligned, achieving uniform contact of the entire contact surface, eliminating the leakage risk of one side being in contact and the other side having a gap from the perspective of the movement trajectory, and significantly improving the sealing reliability.

[0016] 3. This utility model uses a symmetrical arc-shaped protrusion at the center of the elastic wedge-shaped single gate to form a hollow cavity. This not only disperses the axial force transmitted by the valve stem through the arc-shaped structure, avoiding stress concentration, but also reduces the weight of the elastic wedge-shaped single gate through the hollow cavity. At the same time, the arc-shaped transition structure at the top of the elastic wedge-shaped single gate effectively disperses the top stress, avoids wear with the valve cover, and extends the service life of the elastic wedge-shaped single gate and the valve cover. In addition, the sealing surface is ground to Ra≤0.4μm, and the wedge angle design reduces friction loss on the sealing surface and improves wear resistance. Attached Figure Description

[0017] To more clearly illustrate the technical solutions of the embodiments of this utility model, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0018] Figure 1 A schematic diagram of the overall assembly structure of a wedge-type single-gate valve; Figure 2 This is a cloud diagram for valve body stress analysis; Figure 3 A cloud diagram for valve body displacement analysis; Figure 4 Displacement analysis cloud diagram for elastic wedge gate; Figure 5 The diagram shows the structure of an elastic wedge single gate, with the upper left being the front view of the elastic wedge single gate, the upper right being the right sectional view of the elastic wedge single gate, and the lower left being the top view of the elastic wedge single gate. Figure 6 This is an isometric view of a flexible wedge-type single gate.

[0019] The attached diagram lists the components represented by each number as follows: 1-Valve body, 2-Elastic wedge gate, 3-Square nut, 4-Valve stem, 5-Valve cover, 6-Stuffing gland, 7-Stuffing gland, 8-Handwheel. Detailed Implementation

[0020] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of the present utility model.

[0021] In existing technology, because the gate of the standard gate valve CB / T3955-2004 "Flanged Stainless Steel Gate Valve" is a rigid structure, when the deformation of the gate sealing surface at the 6 o'clock position in contact with the valve body reaches its limit, the deformation at other positions cannot fill the deformation of the valve body sealing surface. Simultaneously, the overall deformation of the gate sealing surface is small and uneven. This results in the applied sealing pressure not being able to completely compensate for the sealing joint's seal formation due to processing deviations and deformation, leading to gaps and sealing failure. This results in leakage on both sealing surfaces A and B, which matches the actual leakage points, thus demonstrating the correctness of the theoretical analysis. The production test results are shown in Table 1.

[0022]

[0023] Table 1. Test Results A 3D model was created using Solidworks, and finite element analysis software was applied to simulate and analyze the stress on the valve body and gate to identify the causes and locations of leaks at the sealing surface, comparing the results with actual leak points. Improvements were made to the single-gate valve, designing a resilient wedge-type single-gate valve to reduce energy losses in the pipeline system caused by design deficiencies in the valve itself.

[0024] An embodiment of the present invention provides a resilient wedge single gate valve, comprising a valve body 1, a valve cover 5, a resilient wedge single gate 2, and a valve seat. The valve cover 5 is disposed on the valve body 1, and the valve body 1 and the valve cover 5 enclose a pressure-bearing sealing cavity within the valve. The valve seat is symmetrically arranged along the center line of the valve body 1, and the valve seat is provided with a wedge angle. A guide rail is provided inside the valve body 1. A flexible wedge gate 2 is positioned between two valve seats with wedge angles. The flexible wedge gate 2 has a guide groove that matches the guide rail of the valve body 1. The flexible wedge gate 2 moves up and down relative to the guide rail via the guide groove, causing its sealing surface to engage with the corresponding valve seat's sealing surface to achieve closure, or to move away from each other to achieve opening. This invention, through the precise engagement of the guide rail of the valve body 1 and the guide groove of the flexible wedge gate 2, forcibly restricts the flexible wedge gate 2 to move only axially, completely avoiding gate misalignment and jamming. Simultaneously, the precise guidance ensures that the gate's sealing surface and the valve seat's sealing surface remain parallel and aligned, achieving uniform contact across the entire contact surface. This eliminates the risk of leakage due to one-sided contact and gaps on the other side, significantly improving sealing reliability.

[0025] The bottom of the elastic wedge-type single gate 2 in this embodiment of the invention is symmetrically provided with elastic groove structures, and each elastic groove structure is set at a predetermined distance from the sealing surface of the adjacent elastic wedge-type single gate 2. Specifically, there are two elastic groove structures, which ensures that the two sealing surfaces of the elastic wedge-type single gate 2 have a certain degree of elasticity after they are in contact with the valve seat. A wedge angle α is provided between the sealing surface of the elastic wedge-type single gate 2 and the vertical axis, and the wedge angle α is adapted to the wedge angle of the valve seat. This invention further enhances the tightness of the sealing surface by matching the sealing surface of the elastic wedge-type single gate 2 with the wedge angle α of the valve seat, and is especially suitable for high-pressure and leakage-prone working conditions.

[0026] The elastic wedge-type single gate 2 of this utility model has an elastic compensation gap structure on its top. The elastic compensation gap structure coincides with the center line of the elastic wedge-type single gate 2, and the width of the elastic compensation gap structure is equal to the width of the elastic groove structure. In order to ensure that the sealing surface of the elastic wedge-type single gate 2 can generate uniform and slight elastic deformation to compensate for the angle between the two sealing surfaces when the machining accuracy is not high, it ensures that the two sealing surfaces of the gate and the valve seat can simultaneously achieve complete fit, form a sealing pressure, and achieve sealing. Moreover, when the medium temperature rises, the gate is not easily wedged. Through the elastic compensation gap structure, the deformation of the rigid gate is increased, and sealing is achieved. This utility model, through the synergistic effect of the elastic groove structure at the bottom of the elastic wedge-type single gate 2 and the elastic compensation gap structure at the top, can compensate for machining or assembly errors through slight deformation, so that the sealing surface of the elastic wedge-type single gate 2 and the sealing surface of the valve seat are uniformly fitted, forming a stable sealing pressure and effectively preventing medium leakage.

[0027] Each elastic wedge-shaped single gate 2 in this embodiment of the present invention has a symmetrical arc-shaped protrusion structure on its center line. The arc-shaped protrusion structure extends along the height direction of the elastic wedge-shaped single gate 2, and the two arc-shaped protrusion structures enclose and form a hollow cavity that runs through the elastic wedge-shaped single gate 2 from top to bottom.

[0028] The resilient wedge-type single-gate valve of this utility model embodiment also includes a valve stem 4, a square nut 3, and a square nut mounting and positioning hole. The upper part of the elastic wedge-type single gate 2 is provided with a square nut mounting and positioning hole, which is coaxial with the hollow cavity; the square nut 3 is set in the square nut mounting and positioning hole. The lower end of the valve stem 4 passes through the hollow cavity and is connected to the square nut 3 by a trapezoidal thread. The center line of the valve stem 4 is coaxially set with the center line of the elastic wedge single gate 2. When the gate valve is opened or closed, the valve stem 4 is rotated to drive the square nut 3, which in turn drives the elastic wedge single gate 2 to move up and down.

[0029] The resilient wedge single gate valve of this utility model embodiment also includes a stuffing box 6, packing, a packing gland 7 and a handwheel 8. The valve stem 4 passes through the valve cover 5 and contacts the packing in the stuffing box 6. By pressing the packing gland 7, the packing is in close contact with the valve stem 4 to form a dynamic sealing structure. The top of the valve stem 4 is provided with a handwheel 8.

[0030] In this embodiment of the utility model, the valve cover 5 and the valve body 1 are connected by a flange; the sealing surface of the elastic wedge single gate 2 is ground, and the surface roughness Ra of the sealing surface of the elastic wedge single gate 2 is ≤0.4μm.

[0031] The upper part of the elastic wedge-type single gate 2 of this utility model is provided with a through groove structure formed by milling along the radial direction. The through groove structure is completely through in the direction perpendicular to the sealing surface of the elastic wedge-type single gate 2. The through groove structure is located below the elastic compensation gap structure and is not through the elastic compensation gap structure at a preset distance. The through groove structure makes the upper part of the elastic wedge-type single gate 2 form a two-lobed structure that is symmetrical from left to right. The center line of the symmetry of the two-lobed structure coincides with the center line of the elastic wedge-type single gate 2.

[0032] This invention utilizes a symmetrical arc-shaped protrusion at the center of the elastic wedge-shaped single gate 2 to form a hollow cavity. This arc-shaped structure disperses the axial force transmitted by the valve stem, preventing stress concentration, and the hollow cavity also reduces the weight of the elastic wedge-shaped single gate 2. Simultaneously, the arc-shaped transition structure at the top of the elastic wedge-shaped single gate 2 effectively disperses top stress, preventing wear with the valve cover 5 and extending the service life of both the elastic wedge-shaped single gate 2 and the valve cover 5. Furthermore, the sealing surface is ground to Ra≤0.4μm, and the wedge angle design reduces frictional loss on the sealing surface, improving wear resistance.

[0033] Specifically, the resilient wedge gate valve of this utility model has a non-rising stem structure, and its overall height remains unchanged when fully open. It mainly includes parts such as valve body 1, resilient wedge gate 2, square nut 3, valve stem 4, valve cover 5, stuffing box 6, stuffing gland 7, and handwheel 8. Figure 1 As shown. The valve body 1, the elastic wedge gate 2, and the valve cover 5 are precision cast and connected by flanges. The elastic wedge gate 2 has guide rail grooves on both sides and is connected to the valve stem 4 via square nuts 3. Rotating the handwheel 8 drives the valve stem 4 to rotate, causing the elastic wedge gate 2 to move up and down relative to the guide rails in the valve body 1, thus achieving closing and opening.

[0034] The resilient wedge gate valve features a double-sided forced sealing structure. Regardless of which end the medium flows in from, the resilient wedge gate 2 and the valve body 1 always maintain a seal simultaneously between their two sealing surfaces, allowing the medium to flow in from either end of the valve body 1 without limitation. The sealing performance is forcibly guaranteed by the axial force of the valve stem. When there is no medium, the positive pressure between the sealing surfaces must not be less than the sum of the medium's static pressure and the sealing force.

[0035] This patent features advanced design, reasonable structure, excellent sealing effect, and long service life. Through strength calculations and finite element analysis of the valve body 1, the results show that: Figure 2 and Figure 3As shown, the maximum stress of valve body 1 is 34.4 MPa, which is less than the material yield strength of 196 MPa and the allowable stress, meeting the requirements. The maximum displacement of valve body 1 is 0.0226 mm, satisfying the requirement that the deformation of valve body 1 cavity is controlled within 0.001 DN. The overall rigidity is further enhanced by reinforcing ribs, and the wall thickness and strength checks both meet the requirements. The designed elastic wedge-type single gate 2 with elastic groove retains the advantages of the original simple structure and reliable use, while also generating uniform, minute elastic deformation to compensate for the angle between the two sealing surfaces under conditions of low machining accuracy, thus ensuring sealing performance and greatly improving sealing efficiency. Finite element analysis calculations of the elastic wedge-type single gate 2 were performed using Solidworks Simulation to ensure reasonable design and safe use, providing practical and theoretical references for new product development and ensuring the use of the wedge-type single gate under special working conditions, such as... Figure 4 As shown, this is a displacement analysis cloud diagram of an elastic wedge gate.

[0036] Because the standard gate valve CB / T3955-2004 "Flanged Stainless Steel Gate Valves" uses a wedge-type single gate structure, the deformation area and amount of the sealing surface are small and uneven when closed. Furthermore, the sealing pressure applied to the elastic wedge-type single gate 2 cannot compensate for the deformation of the valve body 1's sealing surface and the sealing pair's sealing effect due to machining deviations, resulting in gaps and sealing failure. The analysis points match the actual leakage points. This patent designs an elastic wedge-type single gate 2 with an elastic groove structure. Elastic grooves are machined at the bottom and top of the sealing surface of the elastic wedge-type single gate 2, increasing the deformation of the rigid gate to achieve a seal and zero leakage. It combines the advantages of a simple and reliable rigid single gate structure with uniform elastic deformation to compensate for the sealing surface angle even with low machining precision, allowing both sealing pairs to seal simultaneously, significantly improving sealing and safety performance. Even in high-temperature media, the elastic wedge-type single gate 2 is not easily wedged, meeting both standard and practical application requirements.

[0037] The wedge-type single gate has a relatively simple structure but is reliable in use. It has high requirements for the machining accuracy and symmetry of the sealing surface angle, which makes machining and assembly difficult. At the same time, it requires that the valve seat deformation is small when the valve is closed. It can only use the slight elasticity generated by the gate to compensate for the deviation of the sealing surface angle during the manufacturing process and achieve a tight fit with the valve seat. This ensures that the two sealing surfaces of the gate and the valve seat are completely matched at the same time, forming a sealing pressure to achieve a seal. However, the possibility of the gate being wedged when the medium temperature rises is also relatively high.

[0038] The elastic wedge-type single gate 2 designed in this application uses a milling cutter to machine two elastic grooves of width C at a distance E from the sealing surface. Simultaneously, a slit structure of equal width is machined at the center of the upper end of the square nut hole on the gate, increasing the deformation of the rigid gate and achieving a seal. Figure 5 As shown.

[0039] Working principle: This valve is a non-sunk stem wedge gate valve. When the handwheel 8 is rotated clockwise, the elastic wedge gate 2 descends and cuts off the passage. When it is rotated counterclockwise, it opens.

[0040] In the description of this specification, references to terms such as "an embodiment," "example," "specific example," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0041] The preferred embodiments of this utility model disclosed above are merely illustrative of the present utility model. These preferred embodiments do not exhaustively describe all details, nor do they limit the utility model to any specific implementation. Clearly, many modifications and variations can be made based on the content of this specification. This specification selects and specifically describes these embodiments to better explain the principles and practical applications of this utility model, thereby enabling those skilled in the art to better understand and utilize it. This utility model is limited only by the claims and their full scope and equivalents.

Claims

1. A resilient wedge-type single-gate valve, characterized in that, Includes valve body (1), valve cover (5), resilient wedge gate (2), and valve seat. The valve cover (5) is disposed on the valve body (1), and the valve body (1) and the valve cover (5) enclose the valve to form a pressure-bearing sealing cavity; The valve seat is symmetrically arranged along the center line of the valve body (1), and the valve seat is provided with a wedge angle; The valve body (1) is provided with a guide rail; The elastic wedge gate (2) is set between two valve seats with wedge angles. The elastic wedge gate (2) is provided with a guide groove. The guide groove is adapted to the guide rail of the valve body (1). The elastic wedge gate (2) moves up and down relative to the guide rail through the guide groove, so that the sealing surface of the elastic wedge gate (2) is in contact with the sealing surface of the corresponding valve seat to achieve closure or moves in opposite directions to achieve opening.

2. The resilient wedge-type single-gate valve according to claim 1, characterized in that, The bottom of the elastic wedge-type single gate (2) is also symmetrically provided with elastic groove structures, and each elastic groove structure is provided with a predetermined distance from the sealing surface of the adjacent elastic wedge-type single gate (2); the sealing surface of the elastic wedge-type single gate (2) is provided with a wedge angle α between it and the vertical axis, and the wedge angle α is adapted to the wedge angle of the valve seat.

3. The resilient wedge-type single-gate valve according to claim 2, characterized in that, The top of the elastic wedge-type single gate (2) is provided with an elastic compensation gap structure. The elastic compensation gap structure coincides with the center line of the elastic wedge-type single gate (2), and the width of the elastic compensation gap structure is equal to the width of the elastic groove structure.

4. The resilient wedge-type single-gate valve according to claim 2, characterized in that, Each of the elastic wedge-shaped single gates (2) has a symmetrical arc-shaped protrusion structure on its center line. The arc-shaped protrusion structure extends along the height direction of the elastic wedge-shaped single gate (2), and the two arc-shaped protrusion structures enclose and form a hollow cavity that runs through the elastic wedge-shaped single gate (2) from top to bottom.

5. A resilient wedge-type single-gate valve according to claim 4, characterized in that, It also includes a valve stem (4), a square nut (3), and a square nut mounting hole. The upper part of the elastic wedge-type single gate (2) is provided with a square nut mounting and positioning hole, which is coaxial with the hollow cavity; the square nut (3) is set in the square nut mounting and positioning hole; The lower end of the valve stem (4) passes through the hollow cavity and is connected to the square nut (3) by a trapezoidal thread. The center line of the valve stem (4) is coaxially set with the center line of the elastic wedge single gate (2). When the gate valve is opened or closed, the valve stem (4) is rotated to drive the square nut (3), and the square nut (3) drives the elastic wedge single gate (2) to move up and down.

6. A resilient wedge-type single-gate valve according to claim 5, characterized in that, It also includes a stuffing box (6), packing, a packing gland (7) and a handwheel (8). The valve stem (4) passes through the valve cover (5) and contacts the packing in the stuffing box (6). By tightening the packing gland (7), the packing and the valve stem (4) are in close contact to form a dynamic sealing structure. The top of the valve stem (4) is provided with a handwheel (8).

7. The resilient wedge-type single-gate valve according to claim 1, characterized in that, The valve cover (5) and valve body (1) are connected by a flange; the sealing surface of the elastic wedge single gate (2) is ground, and the surface roughness Ra of the sealing surface of the elastic wedge single gate (2) is ≤0.4μm.

8. A resilient wedge-type single-gate valve according to claim 3, characterized in that, The upper part of the elastic wedge-type single gate (2) is provided with a through groove structure formed by milling process along the radial direction. The through groove structure is completely through in the direction perpendicular to the sealing surface of the elastic wedge-type single gate (2). The through groove structure is located below the elastic compensation gap structure and is not through the elastic compensation gap structure at a preset distance. The through groove structure makes the upper part of the elastic wedge-type single gate (2) form a two-lobed structure with left and right symmetry. The center line of the two-lobed structure coincides with the center line of the elastic wedge-type single gate (2).

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