Gate valve

Abstract

The utility model relates to the technical field of gate valves, and discloses a gate valve which comprises a valve body and a valve plate, the valve body is provided with a medium flow channel, the medium flow channel is provided with a first sealing face, the valve plate is movably arranged in the valve body in the first direction, and the valve plate is provided with a first position and a second position relative to the valve body; the valve plate is provided with a second sealing face assembled with the first sealing face in a matched mode, when the valve plate is located at the first position, the first sealing face and the second sealing face are separated so that the medium flow channel can be communicated, and when the valve plate is located at the second position, the first sealing face and the second sealing face are attached in a sealed mode so that the medium flow channel can be disconnected. The second sealing face inclines towards the central axis of the valve plate, the central axis is parallel to the first direction, the inclination angle of the second sealing face is alpha, and the relation that alpha is larger than 3 degrees and smaller than or equal to 4.4 degrees is met. Therefore, by reasonably setting the inclination angle of the second sealing face, the valve plate can make contact with the valve body more tightly, and the sealing effect of the gate valve can be better improved.

Description

Technical Field

[0001] This application relates to the field of gate valve technology, and more particularly to a gate valve. Background Technology

[0002] Gate valves, as a commonly used valve structure, are widely used in various pipeline connections.

[0003] In related technologies, gate valves include structures such as valve body, valve plate, and valve stem. The valve plate is movable along the vertical direction of the valve stem and is constructed as a wedge-shaped valve plate. The valve plate has a valve plate sealing surface, and the valve body has a valve body sealing surface corresponding to the valve plate sealing surface. The working principle of the gate valve is that when the gate valve is closed, the sealing effect is achieved by the forced contact between the valve plate sealing surface and the valve body sealing surface.

[0004] However, the sealing performance of gate valves is currently poor. Therefore, how to improve the sealing performance of gate valves has become an urgent technical problem to be solved. Utility Model Content

[0005] This application provides a gate valve in which, by reasonably setting the inclination angle of the second sealing surface, the valve plate and the valve body can be in closer contact, which is beneficial to improving the sealing effect of the gate valve.

[0006] To achieve the above objectives, the main technical solutions adopted in this application include:

[0007] In a first aspect, embodiments of this application provide a gate valve, comprising:

[0008] The valve body has a medium flow channel and a first sealing surface is provided on the medium flow channel;

[0009] The valve plate is movably disposed in the valve body along the first direction, and the valve plate has a first position and a second position relative to the valve body. The valve plate is provided with a second sealing surface that is fitted and assembled with the first sealing surface. When the valve plate is in the first position, the first sealing surface and the second sealing surface are separated to allow the medium flow channel to be open. When the valve plate is in the second position, the first sealing surface and the second sealing surface are sealed and fitted to allow the medium flow channel to be closed.

[0010] From the first position to the second position, the second sealing surface is inclined toward the central axis of the valve plate, wherein the central axis is parallel to the first direction, and the inclination angle of the second sealing surface is α, which satisfies the relationship: 3°<α≤4.4°.

[0011] According to the gate valve proposed in the first aspect of this application, when the first sealing surface and the second sealing surface are sealed and fitted together, by reasonably setting the tilt angle of the second sealing surface, the valve plate and the valve body can be made to contact more tightly, thereby improving the sealing effect of the gate valve.

[0012] Optionally, the tilt angle satisfies the relationship: 3.2°≤α≤4°.

[0013] Optionally, the tilt angle is 3.2° or 4°.

[0014] Optionally, it further includes: a valve cover and a valve stem, the medium flow channel including a first opening, the valve cover sealing the first opening, the valve stem passing through the valve cover, the valve stem having a first end and a second end disposed opposite to each other along a first direction, the first end being drivenly connected to the valve plate, the second end extending out of the valve cover, and the valve stem being adapted to drive the valve plate to move along the first direction to a first position or a second position.

[0015] Optionally, the first end and the valve plate are connected by a lead screw drive.

[0016] Optionally, the first opening has a first internal thread, and the valve cover has a first external thread corresponding to the first internal thread.

[0017] Optionally, the medium flow channel further includes a second opening and a third opening, which are arranged opposite to each other along the second direction, and a first sealing surface is disposed between the second opening and the third opening, with the second direction being perpendicular to the first direction.

[0018] Optionally, it further includes: a first sealing element, the valve cover having a mounting hole, the valve stem passing through the mounting hole, the outer peripheral wall of the valve stem having a first sealing groove, the first sealing element being disposed in the first sealing groove and along the radial direction of the valve stem, the first sealing element abutting and being installed between the bottom wall of the first sealing groove and the inner peripheral wall of the mounting hole.

[0019] Optionally, it further includes: a clamping member and a second sealing member, the clamping member being fixedly connected to the valve cover and used to seal the cover mounting hole, the second sealing member being sandwiched between the clamping member and the valve cover along the first direction, and the second sealing member being abutted between the valve stem and the clamping member along the radial direction of the valve stem, the valve stem passing through the second sealing member and the clamping member in sequence, and the second end extending out of the clamping member.

[0020] Optionally, it also includes a handwheel, with the second end fixedly connected to the handwheel. Attached Figure Description

[0021] To more clearly illustrate the technical solutions in the specific embodiments of this application or the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this application. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0022] Figure 1 A cross-sectional view of a gate valve provided in one embodiment of this application;

[0023] Figure 2This is a cross-sectional view of a valve body provided in one embodiment of this application;

[0024] Figure 3 A cross-sectional view of a valve plate provided in one embodiment of this application;

[0025] Figure 4 A schematic diagram of a valve cover provided in one embodiment of this application;

[0026] Figure 5 This is a schematic diagram of a valve stem provided in one embodiment of this application.

[0027] [Explanation of Labels in the Attached Image]

[0028] Gate valve 100;

[0029] Valve body 1; Medium flow channel 11; First sealing surface 111; First opening 112; Second opening 113; Third opening 114;

[0030] Valve plate 2; Second sealing surface 21;

[0031] Valve cover 3; Mounting hole 31;

[0032] Valve stem 4; First end 41; Second end 42; First sealing groove 43;

[0033] First sealing element 5;

[0034] Clamping component 6;

[0035] Second sealing element 7;

[0036] Handwheel 8;

[0037] First direction X;

[0038] Second direction Y. Detailed Implementation

[0039] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0040] Unless otherwise defined, all technical and scientific terms used in this application have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains; the terminology used in the description of this application is for the purpose of describing particular embodiments only and is not intended to limit the application; the terms "comprising" and "having," and any variations thereof, in the description, claims, and accompanying drawings of this application are intended to cover non-exclusive inclusion. The terms "first," "second," etc., in the description, claims, or accompanying drawings of this application are used to distinguish different objects, not to describe a specific order or hierarchy.

[0041] In this application, the reference to "embodiment" means that a specific feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of this application. The appearance of this phrase in various places throughout the specification does not necessarily refer to the same embodiment, nor is it a mutually exclusive, independent, or alternative embodiment. It will be explicitly and implicitly understood by those skilled in the art that the embodiments described in this application can be combined with other embodiments.

[0042] In the description of this application, it should be noted that, unless otherwise expressly specified and limited, the terms "installation," "connection," "linking," and "attachment" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal communication between two components. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0043] In this application, the term "and / or" is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent three cases: A existing alone, A and B existing simultaneously, and B existing alone. Additionally, in this application, the character " / " generally indicates that the preceding and following related objects have an "or" relationship.

[0044] In this application, "multiple" refers to two or more (including two), and similarly, "multiple groups" refers to two or more (including two), and "multiple pieces" refers to two or more (including two).

[0045] It should be noted that gate valves, as a commonly used valve structure, are widely used in various pipeline connections.

[0046] In related technologies, gate valves include structures such as valve body, valve plate, and valve stem. The valve plate is movable along the vertical direction of the valve stem and is constructed as a wedge-shaped valve plate. The valve plate has a valve plate sealing surface, and the valve body has a valve body sealing surface corresponding to the valve plate sealing surface. The working principle of the gate valve is that when the gate valve is closed, the sealing effect is achieved by the forced contact between the valve plate sealing surface and the valve body sealing surface.

[0047] However, the sealing performance of gate valves is currently poor. Therefore, how to improve the sealing performance of gate valves has become an urgent technical problem to be solved.

[0048] Based on this, this application proposes a gate valve 100. When the first sealing surface 111 and the second sealing surface 21 are sealed and fitted together, by reasonably setting the tilt angle of the second sealing surface 21, the valve plate 2 and the valve body 1 can be made to contact more tightly, thereby improving the sealing effect of the gate valve 100.

[0049] The gate valve 100 proposed in this application is described below with reference to the accompanying drawings.

[0050] like Figures 1-5 As shown, the gate valve 100 according to an embodiment of this application includes: a valve body 1 and a valve plate 2. The valve body 1 has a medium flow channel 11, and a first sealing surface 111 is provided on the medium flow channel 11. The valve plate 2 is movably disposed in the valve body 1 along the first direction X, and the valve plate 2 has a first position and a second position relative to the valve body 1. The valve plate 2 is provided with a second sealing surface 21 that is fitted and assembled with the first sealing surface 111. When the valve plate 2 is in the first position, the first sealing surface 111 and the second sealing surface 21 are separated to allow the medium flow channel 11 to be open. When the valve plate 2 is in the second position, the first sealing surface 111 and the second sealing surface 21 are sealed and fitted to allow the medium flow channel 11 to be disconnected. From the first position to the second position, the second sealing surface 21 is inclined toward the central axis of the valve plate 2, wherein the central axis is parallel to the first direction X, and the inclination angle of the second sealing surface 21 is α, which satisfies the relationship: 3°<α≤4.4°.

[0051] Specifically, taking gate valve 100 according to Figure 1 Taking the placement direction shown as an example, it can be understood that the first direction X is the vertical direction. The valve plate 2 is set inside the valve body 1, and along the vertical direction, the valve plate 2 can move up and down relative to the valve body 1 so that the valve plate 2 can move to the first position or the second position.

[0052] Gate valve 100 typically controls the opening and closing of the medium flow channel 11 by raising and lowering the valve plate 2. (Continue to refer to...) Figure 1As shown, the first position is when the valve plate 2 moves upward to open the medium flow channel 11, and the second position is when the valve plate 2 moves downward to close the medium flow channel 11. That is, when the valve plate 2 is in the first position (e.g., the open state), the first sealing surface 111 of the valve body 1 separates from the second sealing surface 21 of the valve plate 2, and the medium flow channel 11 is open. When the valve plate 2 is in the second position (e.g., the open state), the first sealing surface 111 of the valve body 1 and the second sealing surface 21 of the valve plate 2 are in contact with each other and sealed, and the medium flow channel 11 is closed.

[0053] Furthermore, as a concrete example, refer to Figures 1-3 As shown, the valve plate 2 is constructed as a wedge-shaped valve plate 2. Second sealing surfaces 21 are respectively provided on both sides of the valve plate 2. Two first sealing surfaces 111, corresponding one-to-one with the two second sealing surfaces 21, are provided on the medium flow channel 11. The medium flow channel 11 is divided into a first sub-flow channel, a second sub-flow channel, and a third sub-flow channel by the two first sealing surfaces 111. The second sub-flow channel is located between the two first sealing surfaces 111, and the first and third sub-flow channels are located on both sides of the second sub-flow channel. When the valve plate 2 moves upward to the first position, the two second sealing surfaces 21 of the valve plate 2 respectively seal with their corresponding first sealing surfaces 111. 1. Separation: Thus, the first sub-channel, the second sub-channel, and the third sub-channel are sequentially connected, that is, the medium channel 11 is connected. In other words, the medium can flow in the medium channel 11. The medium flowing in the medium channel 11 can be water, natural gas, or other gases or liquids with flow properties. When the valve plate 2 moves downward to the second position, the valve plate 2 moves between the two first sealing surfaces 111, and the two second sealing surfaces 21 of the valve plate 2 are pressed and adhered to their respective first sealing surfaces 111. Thus, the first sub-channel and the third sub-channel are cut off by the valve plate 2, that is, the medium channel 11 is disconnected.

[0054] In some embodiments of this application, such as Figure 3 As shown, the second sealing surface 21 is inclined relative to the central axis of the valve plate 2 along the vertical direction from top to bottom. The inclination angle of the second sealing surface 21 is the angle between the second sealing surface 21 and the vertical plane. It should be noted that when the valve plate 2 is pressed down to seal the first sealing surface 111 and the second sealing surface 21, the size of the inclination angle of the second sealing surface 21 will affect the sealing effect of the gate valve 100 and the force required for the valve plate 2 to move. For example, if the inclination angle of the second sealing surface 21 is too large, it may cause excessive friction when the valve plate 2 moves, making operation difficult and easily leading to accelerated wear of the valve plate 2, thereby affecting the service life of the gate valve 100. If the inclination angle of the second sealing surface 21 is too small, the wedging effect between the first sealing surface 111 and the second sealing surface 21 may be insufficient, greatly reducing the sealing performance.

[0055] Based on this, the tilt angle of the second sealing surface 21 is set to be greater than 3° and less than or equal to 4.4°. This makes the tilt angle of the second sealing surface 21 within a reasonable range. When the first sealing surface 111 and the second sealing surface 21 are sealed and fitted together, the medium pressure acts on the valve plate 2. The reasonable tilt angle is conducive to enhancing the self-tightening effect between the sealing surfaces. At the same time, the reasonable tilt angle of the second sealing surface 21 in this application can also reduce the opening and closing resistance, which is conducive to reducing local wear and extending the service life of the gate valve 100. Moreover, this angle range is particularly suitable for high cycle number scenarios.

[0056] According to the gate valve 100 proposed in the first aspect embodiment of this application, when the first sealing surface 111 and the second sealing surface 21 are sealed and fitted together, by reasonably setting the tilt angle of the second sealing surface 21, the valve plate 2 and the valve body 1 can be made to contact more tightly, thereby improving the sealing effect of the gate valve 100.

[0057] In some embodiments of this application, the tilt angle satisfies the relationship: 3.2°≤α≤4°. That is, in order to further improve the sealing effect and service life of the gate valve 100, the tilt angle of the second sealing surface 21 can be set to be greater than or equal to 3.2° and less than or equal to 4°. For example, the tilt angle of the second sealing surface 21 can be set to 3.2°, 3.3°, 3.4°, 3.5°, 3.6°, 3.7°, 3.8°, 3.9°, or 4.0°, which can greatly reduce the leakage rate of the gate valve 100 after high-frequency opening and closing.

[0058] In some embodiments of this application, the tilt angle is 3.2° or 4°. Preferably, the tilt angle of the second sealing surface 21 can be set to 3.2° or 4°, which can maximize the sealing effect of the gate valve 100 and the service life of the gate valve 100.

[0059] In some embodiments of this application, such as Figures 1-5 As shown, it also includes: a valve cover 3 and a valve stem 4. The medium flow channel 11 includes a first opening 112. The valve cover 3 is sealed in the first opening 112. The valve stem 4 passes through the valve cover 3. Along the first direction X, the valve stem 4 has a first end 41 and a second end 42 that are arranged opposite to each other. The first end 41 is connected to the valve plate 2 in a driving connection. The second end 42 extends out of the valve cover 3. The valve stem 4 is adapted to drive the valve plate 2 to move along the first direction X to a first position or a second position.

[0060] Specifically, such as Figure 2 As shown, the axis of the first opening 112 of the medium flow channel 11 is parallel to the first direction X. The valve plate 2 can be installed into the medium flow channel 11 through the first opening 112, as shown. Figure 5As shown, along the first direction X, the valve stem 4 has a first end 41 and a second end 42 that are arranged opposite to each other. The first end 41 of the valve stem 4 extends into the medium flow channel 11 and is connected to the valve plate 2 in a driving manner. It can be understood that the first end 41 of the valve stem 4 can be connected to the valve plate 2 in a driving manner, or it can be indirectly connected to the valve plate 2 through other components.

[0061] As a specific example, the valve stem 4 is fixedly connected to the valve plate 2, the valve cover 3 seals the first opening 112, the valve stem 4 passes through the valve cover 3, and the second end 42 of the valve stem 4 extends out of the valve cover 3. When the valve stem 4 is driven to move up and down in the first direction X, the valve stem 4 drives the valve plate 2 to move up and down in the first direction X, so that the valve plate 2 can move to the first position or the second position. In this way, by setting the part of the valve stem 4 that drives the valve plate 2 to move up and down on the outside of the valve cover 3, it is easier to control the up and down movement of the valve plate 2.

[0062] It should be noted that the valve cover 3 and the valve stem 4, together with the sealing element, can seal the first opening 112, thereby preventing the medium (water, natural gas) from leaking from the first opening 112 when the valve plate 2 opens the medium flow channel 11.

[0063] In some embodiments of this application, the first end 41 and the valve plate 2 are connected by a screw drive. It should be noted that the screw drive refers to the conversion of rotational motion into linear motion through the cooperation of a screw and a nut. The first end 41 of the valve stem 4 is constructed as a screw, and the valve plate 2 has a threaded connection that mates with the screw. Thus, by driving the valve stem 4 and the valve plate 2 to rotate relative to each other, the valve plate 2 can be driven up and down.

[0064] Screw drives offer high transmission precision. The lead of the screw (i.e., the linear travel distance per revolution) can be precisely designed, enabling fine-tuning of the valve plate 2 position. This ensures accurate contact between the first sealing surface 111 and the second sealing surface 21. Furthermore, screw drives provide high repeatability, guaranteeing consistent sealing each time the valve is closed, thus improving sealing reliability, especially for valves that require frequent opening and closing. Additionally, screw drives eliminate the need for intermediate conversion mechanisms such as gears and connecting rods, resulting in a compact structure that is well-suited for designs with limited internal space, such as gate valves 100.

[0065] In some embodiments of this application, the first opening 112 has a first internal thread, and the valve cover 3 has a first external thread corresponding to the first internal thread. That is, the valve cover 3 can be fixedly installed on the valve body 1 by screwing the first external thread and the first internal thread together. This threaded connection can not only provide a stable connection, but also reduce the probability of fluid medium leaking from the first opening 112.

[0066] In addition, the threaded assembly method is relatively simple, and the connection between the first opening 112 and the valve cover 3 is highly efficient.

[0067] In some embodiments of this application, such as Figure 1 and Figure 2 As shown, the medium flow channel 11 also includes a second opening 113 and a third opening 114. Along the second direction Y, the second opening 113 and the third opening 114 are arranged opposite to each other. The first sealing surface 111 is disposed between the second opening 113 and the third opening 114. The second direction Y is perpendicular to the first direction X.

[0068] Specifically, the axis of the first opening 112 is perpendicular to the axes of the second opening 113 and the third opening 114. The valve plate 2 has second sealing surfaces 21 on both sides. The medium flow channel 11 has two first sealing surfaces 111 corresponding to the two second sealing surfaces 21, positioned between the second opening 113 and the third opening 114. When the valve plate 2 moves upward to the first position, the two second sealing surfaces 21 of the valve plate 2 separate from their respective first sealing surfaces 111. Thus, the second opening 113 and the third opening 114 are connected, allowing the medium to flow from the second opening 113 to the third opening 114, or vice versa. The flow from the third opening 114 to the second opening 113 is smoother due to the relative arrangement of the second and third openings 113 and 114. This helps to reduce turbulence and eddies in the fluid, as well as reduce the flow resistance of the fluid in the pipe and reduce energy loss. It also reduces noise and vibration caused by the impact of the fluid. When the valve plate 2 moves downward to the second position, it moves between the two first sealing surfaces 111, and the two second sealing surfaces 21 of the valve plate 2 are pressed and fitted against their respective first sealing surfaces 111. Thus, the second opening 113 and the third opening 114 are cut off by the valve plate 2, that is, the medium flow channel 11 is disconnected.

[0069] In some embodiments of this application, such as Figure 1 and Figure 5 As shown, it also includes: a first sealing element 5, a valve cover 3 having a mounting hole 31, a valve stem 4 passing through the mounting hole 31, a first sealing groove 43 provided on the outer peripheral wall of the valve stem 4, the first sealing element 5 being disposed in the first sealing groove 43 and along the radial direction of the valve stem 4, the first sealing element 5 abutting between the bottom wall of the first sealing groove 43 and the inner peripheral wall of the mounting hole 31.

[0070] Specifically, the valve cover 3 is assembled with the valve body 1, and the valve stem 4 passes through the mounting hole 31 into the valve cover 3 so that the second end 42 of the valve stem 4 extends out of the valve cover 3. In order to ensure the sealing performance of the valve cover 3 and the valve stem 4 to the first opening 112, this application provides a first sealing groove 43 on the outer peripheral wall of the valve stem 4. The first sealing element 5 can be constructed as an O-ring. The O-ring is fitted inside the first sealing groove 43 and along the radial direction of the valve stem 4. The O-ring abuts against the bottom wall of the first sealing groove 43 and the inner peripheral wall of the mounting hole 31. In this way, the mounting hole 31 of the valve cover 3 can be well sealed, preventing the medium from leaking from the mounting hole 31, and further improving the sealing performance of the gate valve 100.

[0071] In some embodiments of this application, such as Figure 1 As shown, it also includes: a clamping member 6 and a second sealing member 7. The clamping member 6 is fixedly connected to the valve cover 3 and is used to seal the cover mounting hole 31. For example, the clamping member 6 is constructed as a clamping nut, and the clamping nut is threadedly connected to the valve cover 3. This threaded assembly method is relatively simple and has high connection efficiency.

[0072] Furthermore, along the first direction X, the second sealing element 7 is sandwiched between the clamping element 6 and the valve cover 3, and along the radial direction of the valve stem 4, the second sealing element 7 is abutted between the valve stem 4 and the clamping element 6. In this way, the second sealing element 7 can effectively fill and seal the gap between the clamping element 6 and the valve cover 3, thereby further improving the sealing performance of the gate valve 100.

[0073] Meanwhile, the valve stem 4 passes through the second sealing element 7 and the clamping element 6 in sequence, and the second end 42 extends out of the clamping element 6. In this way, the part of the valve stem 4 is set on the outside of the clamping element 6, which will not affect the up and down driving of the valve plate 2.

[0074] In some embodiments of this application, such as Figure 1 As shown, it also includes: a handwheel 8, with the second end 42 fixedly connected to the handwheel 8. That is, the second end 42 of the valve stem 4 is fixedly connected to the handwheel 8. When the first end 41 of the valve stem 4 and the valve plate 2 are connected by a screw drive, rotating the handwheel 8 can drive the valve stem 4 to rotate relative to the valve plate 2, thereby enabling the valve plate 2 to be driven up and down. The handwheel 8 is ergonomically designed, and by increasing the rotation radius, the operating torque can be reduced, thus making it easy to open and close the valve. At the same time, rotating the handwheel 8 multiple times corresponds to a small linear displacement of the screw. Combined with the high precision characteristics of the screw, the sealing surface contact force can be finely adjusted. By slowly rotating the screw with the handwheel 8, the second sealing surface 21 of the valve plate 2 gradually presses against the first sealing surface 111 along the tilt angle, evenly distributing the sealing pressure, avoiding impact loads, and helping to extend the sealing life.

[0075] It should also be noted that the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

[0076] The various embodiments in this specification are described in a progressive manner. Similar or identical parts between embodiments can be referred to interchangeably. Each embodiment focuses on describing the differences from other embodiments. In particular, the system embodiments are basically similar to the method embodiments, so the description is relatively simple; relevant parts can be referred to the descriptions in the method embodiments.

[0077] The above description is merely an embodiment of this application and is not intended to limit this application. Various modifications and variations can be made to this application by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principle of this application should be included within the scope of the claims of this application.

[0078] Although embodiments of this application have been described in conjunction with the accompanying drawings, those skilled in the art can make various modifications and variations without departing from the spirit and scope of this application, and such modifications and variations all fall within the scope defined by the appended claims.

Claims

1. A gate valve, characterized by include: Valve body (1), the valve body (1) has a medium flow channel (11), and a first sealing surface (111) is provided on the medium flow channel (11). A valve plate (2) is movably disposed within the valve body (1) along a first direction (X), and the valve plate (2) has a first position and a second position relative to the valve body (1). The valve plate (2) is provided with a second sealing surface (21) that is fitted and assembled with the first sealing surface (111). When the valve plate (2) is in the first position, the first sealing surface (111) and the second sealing surface (21) are separated to allow the medium flow channel (11) to be open. When the valve plate (2) is in the second position, the first sealing surface (111) and the second sealing surface (21) are sealed and fitted to allow the medium flow channel (11) to be disconnected. From the first position to the second position, the second sealing surface (21) is inclined toward the central axis of the valve plate (2), wherein the central axis is parallel to the first direction (X), and the inclination angle of the second sealing surface (21) is α, satisfying the relationship: 3°<α≤4.4°; The medium flow channel (11) further includes a second opening (113) and a third opening (114) along a second direction (Y). The second opening (113) and the third opening (114) are arranged opposite to each other. The first sealing surface (111) is located between the second opening (113) and the third opening (114). The second direction (Y) is perpendicular to the first direction (X).

2. The gate valve of claim 1, wherein, The tilt angle satisfies the following relationship: 3.2°≤α≤4°.

3. The gate valve of claim 1, wherein, The tilt angle is 3.2° or 4°.

4. The gate valve according to any one of claims 1 to 3, characterized in that Also includes: The valve cover (3) and valve stem (4) are provided. The medium flow channel (11) includes a first opening (112). The valve cover (3) is sealed in the first opening (112). The valve stem (4) passes through the valve cover (3). Along the first direction (X), the valve stem (4) has a first end (41) and a second end (42) disposed opposite to each other. The first end (41) is throttle connected to the valve plate (2). The second end (42) extends out of the valve cover (3). The valve stem (4) is adapted to drive the valve plate (2) to move along the first direction (X) to the first position or the second position.

5. The gate valve of claim 4, wherein, The first end (41) and the valve plate (2) are connected by a lead screw drive.

6. The gate valve of claim 4, wherein, The first opening (112) has a first internal thread, and the valve cover (3) has a first external thread corresponding to the first internal thread.

7. The gate valve according to claim 4, characterized in that, Also includes: The first sealing element (5) is provided in the valve cover (3), which has a mounting hole (31). The valve stem (4) passes through the mounting hole (31). The outer peripheral wall of the valve stem (4) is provided with a first sealing groove (43). The first sealing element (5) is provided in the first sealing groove (43) and along the radial direction of the valve stem (4). The first sealing element (5) is abutted between the bottom wall of the first sealing groove (43) and the inner peripheral wall of the mounting hole (31).

8. The gate valve of claim 7, wherein, Also includes: A clamping member (6) and a second sealing member (7) are provided. The clamping member (6) is fixedly connected to the valve cover (3) and is used to cover the mounting hole (31). Along the first direction (X), the second sealing member (7) is sandwiched between the clamping member (6) and the valve cover (3). Along the radial direction of the valve stem (4), the second sealing member (7) is abutted between the valve stem (4) and the clamping member (6). The valve stem (4) passes through the second sealing member (7) and the clamping member (6) in sequence, and the second end (42) extends out of the clamping member (6).

9. The gate valve of claim 4, wherein, Also includes: The handwheel (8) is fixedly connected to the second end (42).

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