A wear-resistant valve plate and a gate valve containing the same

Abstract

The utility model relates to the technical field of gate valve especially a kind of wear-resistant valve plate and the gate valve containing it, comprising: board core, one end is connected with the screw rod end part of gate valve, it is equipped with the core hole along with vertical through sliding plane;Side plate, number is two, respectively install in the both sides of board core, for isolating the direct sliding contact between board core and sealing ring to improve valve plate wear resistance, the board core includes top, middle and bottom concave portion of the cross section being I-shaped in turn setting composition, two side plates are respectively embedded in the recess in the both sides of board core, the side plate is set along the plate hole in the direction perpendicular to board face, the plate hole is not greater than the diameter of core hole, for solving the technical problem that valve plate wear resistance is poor, impact resistance is poor and application range is narrow in prior art.

Description

Technical Field

[0001] This utility model relates to the field of gate valve technology, and in particular to a wear-resistant valve plate and a gate valve containing the same. Background Technology

[0002] Gate valves are control devices commonly used in fluid pipelines, widely applied in natural gas, petroleum, chemical, environmental protection, urban pipelines, gas pipelines, venting systems, and gasoline storage devices, serving as opening and closing devices in various pipeline systems. A gate valve typically consists of a valve plate and a valve seat. Its main operating principle is to control the sliding of the valve plate along the valve seat to cut off or connect the fluid. During the frequent opening and closing of conventional gate valves, when the sealing ring between the valve plate and the valve seat slides relative to each other, solid particles in the fluid medium, such as silt and welding slag, can erode and scratch the sealing surface at high speeds, forming grooves. Alternatively, under high pressure differentials, cavitation can occur at the rear of the valve plate, and the bursting of these bubbles impacts the material surface, causing pitting corrosion. Therefore, gate valves are highly susceptible to wear, affecting their service life, reducing the likelihood of malfunctions in fluid pipeline operations, and resulting in poor equipment stability.

[0003] A ceramic gate valve is disclosed in the prior art, according to a utility model patent with publication number CN204828725U. It includes a valve body, a valve cover, a valve stem, and a handwheel. The valve body has a through-flow liquid channel in the middle, and a valve cavity extending downwards and communicating with the liquid channel at the top of the valve body. A valve plate is slidably mounted inside the valve cavity. An elastic rubber block is located at the bottom of the valve cavity below the valve plate. A semi-circular ceramic movable block that cooperates with the valve plate is located on the top of the elastic rubber block. First valve cavity ceramic plates are provided on the front and rear side walls of the valve cavity, and second valve cavity ceramic plates are provided on the left and right side walls of the valve cavity. Ceramic through-tubes are provided on the inner walls of the liquid channels on both sides of the valve plate, and valve plate ceramic plates are provided on both side walls of the valve plate. The aforementioned technologies still have many problems, such as: ① Narrow applicable operating conditions: Existing valve plate ceramic plates mostly rely on diamond grinding for machining and can usually only be installed by bonding or embedding, not by mechanical connection. The temperature resistance of the adhesive limits the operating temperature of the valve plate, and the sliding between the valve plate and the valve seat easily generates high temperatures, resulting in poor installation stability of the ceramic plate; ② Poor impact resistance: Conventional metal valve plates or valve plates with ceramic coatings generally have poor impact resistance. During operation, the valve plate needs to withstand closing collisions, impacts from solid particles in the medium, pressure fluctuations, etc. Ceramic plates or metal valve plates are prone to breakage. Once broken, not only will the valve fail, but it may also damage the entire valve system; ③ Wear resistance needs to be improved: Ceramics have good wear resistance in pure media and under good lubrication conditions, but when applied to fluids containing impurities or in impact environments, wear will accelerate. Conventional metal or carbon steel valve plates are prone to wear and deformation, resulting in poor gate valve sealing performance, requiring frequent replacement, and increasing equipment maintenance costs. Utility Model Content

[0004] The purpose of this utility model is to provide a wear-resistant valve plate and a gate valve containing the same, in order to solve the technical problems of poor wear resistance, poor impact resistance and narrow application range of valve plates in the prior art.

[0005] To achieve the above objectives, this utility model provides the following technical solution:

[0006] A wear-resistant valve plate, comprising:

[0007] The core plate is connected at one end to the screw end of the gate valve, and it has a core hole that runs perpendicular to the sliding plane.

[0008] There are two side plates, which are installed on both sides of the core plate to isolate the core plate from direct sliding contact with the sealing ring, thereby improving the wear resistance of the valve plate.

[0009] Furthermore, the core includes a top, middle and bottom recessed portion arranged in sequence to form an I-shaped cross section, and two side plates are respectively embedded in the grooves on both sides of the core. The side plates are provided with plate holes along the direction perpendicular to the plate surface, and the plate holes are not larger than the core hole diameter.

[0010] Furthermore, the top and middle of the core plate form protrusions for contacting the top surface of the side plate. The bottom recess of the core plate is set as an irregular U-shaped structure. The bottom surface of the bottom recess is a plane, and the angle between the two sides and the bottom surface is an obtuse angle. The thickness of the U-shaped structure is uniform. The bottom surface of the side plate is set as a bottom protrusion. The shape of the bottom protrusion is the same as that of the bottom recess and they are in surface contact. The two sides of the bottom recess are set as planes, and the planes on the two sides of the bottom protrusion of the side plate are in surface contact with each other.

[0011] Furthermore, the thickness of the core plate is H, the thickness of the top and bottom recesses protruding from the center is L, and the angle between the two sides of the bottom recess and the bottom edge is α, where H = (1.5~2.1)L, 120° < α < 150°.

[0012] Furthermore, the thickness of the bottom recess is M, the width of the middle part of the core is K, and the distance from the critical surface between the middle part of the core and the top to the upper surface of the center of the bottom recess is P, where: P = (1.2~1.8)K = 25.5M, P = (7~9)H.

[0013] Furthermore, the distance from the center of the core hole to the upper surface of the center of the bottom recess is Q, and the distance from the center of the core hole to the middle side is R, where: P = (3.3~3.8)Q, R = 0.5K, and the center of the core hole is located in the middle in the horizontal direction.

[0014] Furthermore, the length of the U-shaped bottom edge of the recessed portion is S, where K = (1.5~2)S, and the U-shaped structure is symmetrically arranged about the vertical axis of the core hole center.

[0015] Furthermore, threaded holes are provided at corresponding positions on the side plate and the core plate, which are used to install fasteners to achieve a mechanical connection between the side plate and the core plate.

[0016] Furthermore, the core plate is made of carbon steel or metal, and the side plates are made of carbon ceramic.

[0017] A gate valve including the aforementioned valve plate further includes a detachably installable upper valve cover and a lower valve cover. A threaded rod is threaded through the upper valve cover, and an operating wheel is fixedly installed on the top of the rod. The lower part of the rod is installed with an upper connecting post on the top of the plate core. The lower valve cover has a horizontally penetrating medium channel hole. A sliding cavity is provided inside the lower valve cover. The sliding cavity intersects with the medium channel hole, and the bottom of the sliding cavity is lower than the medium channel hole. The top of the sliding cavity extends upward along the interior of the lower valve cover to the valve cavity. The valve cavity is formed by the upper valve cover and the lower valve cover surrounding each other. A sealing ring is installed at both junctions of the medium channel hole and the sliding cavity. The sealing ring is concentrically arranged with the medium channel hole and is used to isolate the gap between the valve plate and the medium channel hole when the gate valve is closed.

[0018] Compared with the prior art, the technical solution of this utility model has the following beneficial effects:

[0019] (1). This utility model improves the structure of the valve plate to avoid the defects of poor impact resistance and low strength of traditional valve plates made of metal, carbon steel or ceramic and metal combination. By setting the combination of the plate core and the side plate, the part with high wear resistance requirements is replaced with a detachable side plate. At the same time, the structure of the plate core is designed to provide strength support for the side plate, so as to realize the simultaneous improvement of the wear resistance and strength of the valve plate, thereby improving the service life of the valve plate.

[0020] (2). By limiting the size and proportion of the core plate and the side plate, this utility model maximizes the strength support function of the core plate and the wear resistance function of the side plate, while facilitating processing and disassembly. It is also compatible with the gate valve structure in the prior art, without requiring changes to the structure of other components in the gate valve to match the structural improvement of the valve plate, thus minimizing the production cost of the equipment.

[0021] (3) By limiting the material of the core plate and the material of the side plate, this utility model satisfies the dual performance requirements of the valve plate for strength and wear resistance, gives full play to the wear resistance advantage of carbon ceramic material, and at the same time, the brittleness and poor impact resistance of carbon ceramic material are compensated by the metal core plate. Meanwhile, the structural design of the core plate better ensures the full manifestation of the wear resistance of the carbon ceramic side plate, realizes the performance improvement of the valve plate, and ensures the service life of the valve plate. Attached Figure Description

[0022] Figure 1 This is a three-dimensional structural diagram of the valve plate of this utility model;

[0023] Figure 2 This is a schematic diagram of the main structure of the valve plate of this utility model;

[0024] Figure 3 This is a side view of the valve plate of this utility model.

[0025] Figure 4 This is a three-dimensional structural diagram of the plate body of this utility model;

[0026] Figure 5 This is a schematic diagram of the main structure of the core of this utility model;

[0027] Figure 6 This is a side view of the core structure of the present invention.

[0028] Figure 7 This is a three-dimensional structural diagram of the side plate of this utility model;

[0029] Figure 8 This is a schematic diagram of the main structure of the side plate of this utility model;

[0030] Figure 9 This is a three-dimensional structural diagram of the gate valve of this utility model;

[0031] Figure 10 This is an exploded structural diagram of the gate valve of this utility model;

[0032] Figure 11 This is a schematic diagram of the main structure of the gate valve of this utility model;

[0033] Figure 12 for Figure 11 Schematic diagram of the cross-sectional structure at point AA.

[0034] In the diagram: 100, valve plate; 101, upper connecting column; 102, plate core; 1021, top; 1022, middle; 1023, core hole; 1024, bottom recess; 103, side plate; 1031, plate body; 1032, plate hole; 1033, bottom protrusion; 200, operating wheel; 300, screw; 400, upper valve cover; 500, lower valve cover; 600, medium channel hole; 700, sealing ring; 800, valve cavity; 900, sliding cavity. Detailed Implementation

[0035] 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 of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0036] The accompanying drawings are for illustrative purposes only and should not be construed as limiting the scope of this patent.

[0037] The terminology used in the embodiments of this application is for the purpose of describing particular embodiments only and is not intended to limit the embodiments of this application. The singular forms “a,” “the,” and “the” used in the embodiments of this application and the appended claims are also intended to include the plural forms unless the context clearly indicates otherwise. It should also be understood that the term “and / or” as used herein refers to and includes any or all possible combinations of one or more of the associated listed items.

[0038] In the following description, when referring to the accompanying drawings, the same numbers in different drawings denote the same or similar elements unless otherwise indicated. The embodiments described in the following exemplary embodiments do not represent all embodiments consistent with this application. Rather, they are merely examples of apparatuses and methods consistent with some aspects of this application as detailed in the appended claims.

[0039] In the description of this application, it should be understood that the terms "first," "second," "third," etc., are used only to distinguish similar objects and are not necessarily used to describe a specific order or sequence, nor should they be construed as indicating or implying relative importance. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0040] Furthermore, in the description of this application, unless otherwise stated, "multiple" refers to two or more. "And / or" describes the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A alone, A and B simultaneously, or B alone. The character " / " generally indicates that the preceding and following related objects are in an "or" relationship. The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0041] To address the limitations of existing technologies, this embodiment provides a technical solution. The technical solution of this utility model will be further described below with reference to the accompanying drawings and embodiments.

[0042] This utility model is mainly aimed at addressing the problem that the valve plate of the gate valve in the prior art has poor wear resistance. When used for a long time during fluid cut-off, the valve plate surface is easily scratched by impurities between the valve plate and the valve seat, which causes the gate valve to leak. The specific improvement scheme is as follows.

[0043] Example 1

[0044] See appendix Figure 1-3 A wear-resistant valve plate includes: a core plate 102, one end of which is connected to the end of the screw 300 of the gate valve, and has a core hole 1023 that runs perpendicularly through the sliding plane, wherein the core plate 102 is located in the middle of the valve plate 100; and two side plates 103, which are respectively installed on both sides of the core plate 102 to isolate the core plate 102 from direct sliding contact with the sealing ring 700 in order to improve the wear resistance of the valve plate 100. Threaded holes are provided at corresponding positions on the side plate 103 and the core plate 102. These threaded holes are used to install fasteners to achieve a mechanical connection between the side plate 103 and the core plate 102. The core plate 102 is made of carbon steel or metal, and the side plate 103 is made of carbon ceramic. It can be understood that the carbon ceramic side plate 103 has both high hardness and high wear resistance. Compared with ceramic, it can also absorb external impact through fiber deformation, and has high toughness and high impact resistance. Compared with traditional ceramic, which can resist scratches but is easily broken by impact, it has a better effect. Compared with traditional metal, which has good impact resistance but poor wear resistance, it has a better effect. In addition, ceramics have poor machinability and can generally only be machined by diamond grinding. The connection method is to use adhesive or embedded installation. However, when the operating temperature of the gate valve is high, it is easy to cause delamination. Furthermore, carbon ceramics and metal materials such as carbon steel have a high coefficient of thermal expansion. When the temperature changes, the connection between carbon ceramics and the metal core 102 is more reliable and less likely to fall off. However, due to the asynchronous thermal expansion and contraction between ceramics and metals, the adhesive is prone to cracking or loosening.

[0045] See appendix Figure 4-8The core plate 102 includes a top 1021, a middle 1022, and a bottom recess 1024 arranged sequentially to form an I-shaped cross section. Two side plates 103 are respectively embedded in the grooves on both sides of the core plate 102. The side plates 103 are provided with plate holes 1032 along the direction perpendicular to the plate surface. The plate holes 1032 are not larger than the diameter of the core hole 1023. It can be understood that the top 1021 and the bottom recess 1024 are located on the upper and lower sides of the middle 1022 respectively. The three are designed as a whole. The thickness of the top 1021 and the bottom recess 1024 is greater than that of the middle 1022. Therefore, the cross section of the core plate 102 formed by the three is I-shaped. The purpose of the I-shaped structure is to facilitate the embedded installation of the side plates 103, and at the same time, with the help of screw mechanical installation, so as to ensure the stability of the installation between the core plate 102 and the side plates 103. Specifically, the top 1021 and middle 1022 of the core plate 102 form a boss for contacting the top 1021 of the side plate 103. The bottom recess 1024 of the core plate 102 is configured as an irregular U-shaped structure. The bottom surface of the middle position of the bottom recess 1024 is a plane, and the angle between the two sides and the bottom surface is an obtuse angle. The thickness of the U-shaped structure is uniform. The bottom surface of the plate body 1031 of the side plate 103 is configured as a bottom protrusion 1033. The shape of the bottom protrusion 1033 is consistent with the shape of the bottom recess 1024 and they are in surface contact. The two sides of the recess 1024 are set as planes, and these planes are in surface contact with the planes set on the two sides of the bottom protrusion 1033 of the side plate 103. It can be understood that by designing the structure of the core plate 102 and embedding it with the side plate 103, it is not only beneficial to improve the installation stability of the core plate 102 and the side plate 103, but also beneficial to make up for the brittleness and lack of impact resistance of the carbon ceramic material by the high strength performance of the core plate 102 itself, thereby greatly improving the strength and wear resistance of the valve plate 100. Specifically, the thickness of the middle portion 1022 of the core 102 is H, and the thickness of the top portion 1021 and the bottom recess 1024 protruding from the middle portion 1022 is L. The angle between the two sides of the bottom recess 1024 and the bottom edge is α, where H = (1.5~2.1)L, 120° < α < 150°. It can be understood that by limiting the ratio of the thickness H of the middle portion 1022 to the dimension L, high temperature resistance, impact resistance, and sufficient [other properties] can be guaranteed to the maximum extent. Mechanical strength and pressure resistance, especially wear resistance, are greatly improved. When the ratio of H to L is too small, the overall bending deformation resistance of the valve plate 100 decreases significantly, thus affecting the sealing performance of the valve plate 100. If the ratio of H to L is too large, the weight of the valve plate 100 is too large, which will increase the load on the gate valve operating mechanism and is not conducive to rapid opening and closing. At the same time, the core plate 102 has a large heat capacity and slow heating. Under the condition of rapid temperature change, it may generate greater transient thermal stress with the side plate 103.Specifically, the thickness of the bottom recess 1024 is M, the width of the middle part 1022 of the core 102 is K, and the distance from the critical surface between the middle part 1022 and the top 1021 of the core 102 to the upper surface of the center of the bottom recess 1024 is P, where: P = (1.2~1.8)K = 25.5M, P = (7~9)H. Specifically, the distance from the center of the core hole 1023 to the upper surface of the center of the bottom recess 1024 is Q, and the distance from the center of the core hole 1023 to the side of the middle part 1022 is R, where: P = (3.3~3.8)Q, R = 0.5K, and the center of the core hole 1023 is located in the middle part 1022 in the horizontal direction. Specifically, the length of the U-shaped bottom edge of the bottom recess 1024 is S, where: K = (1.5~2)S, and the U-shaped structure is symmetrically arranged about the vertical axis where the center of the core hole 1023 is located. By defining the dimensions and proportions of the core plate 102 and the side plate 103, the strength support function of the core plate 102 and the wear resistance function of the side plate 103 are maximized. At the same time, it is easy to process and disassemble, and it is compatible with the gate valve structure in the existing technology. It does not require changes to the structure of other components in the gate valve to match the structural improvement of the valve plate 100, thus minimizing the production cost of the equipment, ensuring the toughness of the overall structure of the valve plate 100 and its fatigue resistance under temperature cycling, ensuring the toughness of the overall structure of the valve plate 100, avoiding brittle fracture, and extending the service life of the valve plate 100.

[0046] Example 2

[0047] See appendix Figure 9-12 A gate valve including the aforementioned valve plate further includes a detachably installable upper valve cover 400 and a lower valve cover 500. A screw 300 is threaded through the upper valve cover 400, and an operating wheel 200 is fixedly installed on the top 1021 of the screw 300. The lower part of the screw 300 is installed with an upper connecting post 101 on the top 1021 of the plate core 102. The lower valve cover 500 has a horizontally penetrating medium channel hole 600, and a sliding cavity 900 is provided inside the lower valve cover 500. The sliding cavity 900 and the medium channel hole 600... The valve plate 100 and the medium channel hole 600 are arranged at the intersection of the two valves. The bottom of the sliding cavity 900 is lower than that of the medium channel hole 600. The top 1021 of the sliding cavity 900 extends upward along the interior of the lower valve cover 500 to the valve cavity 800. The valve cavity 800 is formed by the upper valve cover 400 and the lower valve cover 500 surrounding each other. A sealing ring 700 is installed at both junctions of the medium channel hole 600 and the sliding cavity 900. The sealing ring 700 is concentrically arranged with the medium channel hole 600 and is used to isolate the gap between the valve plate 100 and the medium channel hole 600 when the gate valve is closed.

[0048] When using the gate valve of this utility model, the medium channel holes 600 on both sides of the lower valve cover 500 are connected in series in the medium channel. When the gate valve needs to be closed, the operating wheel 200 is rotated, causing the screw 300 to rotate and move downward along the upper valve cover 400, thereby driving the valve plate 100 to move downward. This moves the core hole 1023 of the valve plate 100 downward to avoid the sealing ring 700 and the medium flow channel of the medium channel hole 600, thus achieving the closure of the gate valve to cut off the fluid. When the gate valve needs to be opened, the operating wheel 200 is rotated, causing the screw 300 to drive the valve plate 100 upward, thereby driving the core hole 1023 upward so that it is coaxial with the through hole of the sealing ring 700 and the medium channel hole 600, thus achieving the flow of fluid.

[0049] The above description of the disclosed embodiments enables those skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

[0050] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A wear-resistant valve plate, characterized in that, include: The core plate (102) is connected at one end to the end of the screw (300) of the gate valve, and has a core hole (1023) that runs perpendicular to the sliding plane. Two side plates (103) are installed on both sides of the core plate (102) to isolate the core plate (102) from direct sliding contact with the sealing ring (700) in order to improve the wear resistance of the valve plate (100).

2. The wear-resistant valve plate according to claim 1, characterized in that, The core (102) includes a top (1021), a middle (1022) and a bottom recess (1024) arranged in sequence to form an I-shaped cross section. Two side plates (103) are respectively embedded in the grooves on both sides of the core (102). The side plates (103) are provided with plate holes (1032) in a direction perpendicular to the plate surface. The plate holes (1032) are not larger than the diameter of the core hole (1023).

3. The wear-resistant valve plate according to claim 2, characterized in that, The top (1021) and middle (1022) of the core plate (102) form a boss for contacting the top (1021) surface of the side plate (103). The bottom recess (1024) of the core plate (102) is set as an irregular U-shaped structure. The bottom surface of the bottom recess (1024) is a plane, and the angle between the two sides and the bottom surface is an obtuse angle. The thickness of the U-shaped structure is consistent. The bottom surface of the plate body (1031) of the side plate (103) is set as a bottom protrusion (1033). The shape of the bottom protrusion (1033) is consistent with the shape of the bottom recess (1024) and is in surface contact. The two sides of the bottom recess (1024) are set as planes, and the planes are in surface contact with the planes set on the two sides of the bottom protrusion (1033) of the side plate (103).

4. A wear-resistant valve plate according to claim 3, characterized in that, The thickness of the middle part (1022) of the core (102) is H, and the thickness of the top (1021) and the bottom recess (1024) protruding from the middle part (1022) is L. The angle between the two sides of the bottom recess (1024) and the bottom edge is α, H = (1.5~2.1)L, 120° < α < 150°.

5. A wear-resistant valve plate according to claim 4, characterized in that, The thickness of the bottom recess (1024) is M, the width of the middle part (1022) of the core (102) is K, and the distance from the critical surface between the middle part (1022) of the core (102) and the top (1021) to the upper surface of the center of the bottom recess (1024) is P, where: P = (1.2~1.8)K = 25.5M, P = (7~9)H.

6. A wear-resistant valve plate according to claim 5, characterized in that, The distance from the center of the core hole (1023) to the upper surface of the center of the bottom recess (1024) is Q, and the distance from the center of the core hole (1023) to the side of the middle part (1022) is R, where: P = (3.3~3.8)Q, R = 0.5K, and the center of the core hole (1023) is located in the middle part (1022) in the horizontal direction.

7. A wear-resistant valve plate according to claim 6, characterized in that, The length of the U-shaped bottom edge of the recessed portion (1024) is S, where K = (1.5~2)S, and the U-shaped structure is symmetrically arranged about the vertical axis of the core hole (1023).

8. A wear-resistant valve plate according to claim 7, characterized in that, Threaded holes are provided at corresponding positions on the side plate (103) and the core plate (102). These threaded holes are used to install fasteners to achieve a mechanical connection between the side plate (103) and the core plate (102).

9. A wear-resistant valve plate according to claim 8, characterized in that, The core plate (102) is made of carbon steel or metal, and the side plate (103) is made of carbon ceramic.

10. A gate valve comprising a wear-resistant valve plate as described in any one of claims 1-9, characterized in that, It also includes a detachable upper valve cover (400) and a lower valve cover (500). A screw rod (300) is threaded through the upper part of the upper valve cover (400). An operating wheel (200) is fixedly installed on the top (1021) of the screw rod (300). The lower part of the screw rod (300) is installed with the upper connecting post (101) on the top (1021) of the core plate (102). The lower valve cover (500) is provided with a horizontally penetrating medium channel hole (600). A sliding cavity (900) is provided inside the lower valve cover (500). The sliding cavity (900) intersects with the medium channel hole (600). The bottom of the sliding cavity (900) is lower than the medium channel hole (600), and the top (1021) of the sliding cavity (900) extends upward along the interior of the lower valve cover (500) to the valve cavity (800). The valve cavity (800) is formed by the upper valve cover (400) and the lower valve cover (500) surrounding each other. Sealing rings (700) are installed at both junctions of the medium channel hole (600) and the sliding cavity (900). The sealing rings (700) are concentrically arranged with the medium channel hole (600) and are used to isolate the gap between the valve plate (100) and the medium channel hole (600) when the gate valve is closed.

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