Flat gate valve

Abstract

The utility model belongs to the technical field of valves, and particularly relates to a flat gate valve which comprises a valve body, a valve core, a valve rod and a valve rod. The valve cover is arranged on the valve body; the valve plate is arranged on the valve body and comprises a sealing area and a water passing area, and the water passing area is circular; the adjusting structure is arranged on the valve cover, connected with the valve plate and used for controlling the valve plate to move up and down; the sealing structure is arranged on the left valve seat and the right valve seat; when the adjusting structure drives the valve plate to make contact with the sealing structures, the gate plate extrudes the sealing structures on the two sides, and a left sealing face and a right sealing face are formed. The check valve has the beneficial effects that by arranging the adjusting structure, when the adjusting structure drives the valve plate to make contact with the sealing structures, the valve plate can extrude the sealing structures on the two sides to form a tight left sealing face and a tight right sealing face, the sealing performance of the valve body in the closed state is ensured, and the leakage problem is effectively prevented.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of valves, and particularly relates to a flat gate valve. BACKGROUND

[0002] The flat gate valve is a sliding valve with a flat gate as a closing part. The closing part is generally composed of a gate and a valve seat. The compression force of the gate to the valve seat is controlled by the medium pressure acting on the gate. The medium pushes the gate to compress the valve seat, so as to form a seal.

[0003] Patent No. CN108692051B discloses a flat gate valve, which is characterized in that an anti-wear adjusting device is further arranged in the inner cavity of the valve body. The anti-wear adjusting device comprises a horizontal guide rod, an upper bevel gear, a left bevel gear, a right bevel gear, the upper bevel gear is arranged above the gate and the left and right valve seats, the upper bevel gear is provided with an inner hole, the valve rod penetrates the inner hole, a helical groove in a spiral structure is arranged at the wall of the inner hole, a horizontal groove is arranged at the upper wall of the inner cavity of the valve body, the horizontal guide rod is in a round rod structure, one end of the horizontal guide rod is fixed to the upper part of the upper bevel gear, the other end of the horizontal guide rod extends into the horizontal groove, the part of the valve rod extending into the inner hole is provided with a ball head, and the ball head extends into the helical groove.

[0004] The above patent can save labor when opening and closing by avoiding the friction between the sealing surface and the sealing surface of the left and right valve seats. However, the sealing performance is reduced, and improvement is needed. SUMMARY

[0005] The purpose of the present application is to provide a flat gate valve that can solve the above problems.

[0006] The purpose of the present application is to provide a flat gate valve, which comprises:

[0007] A valve body, which is internally provided with a left valve seat and a right valve seat;

[0008] A valve cover arranged on the valve body;

[0009] A valve plate arranged on the valve body, which comprises a sealing area and a water passing area, and the water passing area is circular;

[0010] An adjusting structure arranged on the valve cover and connected with the valve plate, for controlling the upward and downward movement of the valve plate;

[0011] A sealing structure arranged on the left valve seat and the right valve seat;

[0012] When the adjusting structure drives the valve plate to contact the sealing structure, the gate plate extrudes the sealing structures on both sides and forms left and right sealing surfaces.

[0013] The adjusting structure drives the valve plate to contact the sealing structure, and the valve plate extrudes the sealing structure on both sides to form a left sealing surface and a right sealing surface, thereby ensuring the sealing performance of the valve body in the closed state and effectively preventing leakage. The valve plate includes a sealing area and a water passage area, and the water passage area is circular, which not only has a beautiful appearance, but also helps to enhance the overall stability of the valve body. Meanwhile, the connection design of the adjusting structure and the valve plate ensures the stability and accuracy of the valve plate during movement.

[0014] Further, the sealing structure comprises:

[0015] The first sealing ring is arranged on the left valve seat, and the left valve seat is provided with a first mounting groove matched with the first sealing ring;

[0016] The second sealing ring is arranged on the right valve seat, and the right valve seat is provided with a second mounting groove matched with the second sealing ring;

[0017] The first sealing ring and the second sealing ring are made of rubber and have elasticity, and the valve plate extrudes the first sealing ring and the second sealing ring to be tightly pressed on the respective mounting grooves after contacting the first sealing ring and the second sealing ring, thereby achieving sealing.

[0018] The first sealing ring is made of rubber and has good elasticity and wear resistance. The first sealing ring is arranged on the left valve seat and tightly adheres to the left valve seat. The left valve seat is provided with a first mounting groove matched with the first sealing ring, which ensures that the sealing ring will not be displaced or detached during installation. The second sealing ring is also made of rubber and has the same material as the first sealing ring, which ensures the stability of the sealing performance. The second sealing ring is arranged on the right valve seat and tightly adheres to the right valve seat. The right valve seat is provided with a second mounting groove matched with the second sealing ring, which ensures the stable installation of the sealing ring.

[0019] The first sealing ring and the second sealing ring are made of rubber and have excellent elasticity and recovery. When the valve plate contacts the sealing ring, the sealing ring can be deformed by the extrusion of the valve plate to fill the small gap between the valve plate and the valve seat, thereby achieving a tight sealing effect. By arranging the mounting groove matched with the sealing ring, the stability and accuracy of the sealing ring during installation are ensured, which helps to prevent the sealing ring from being displaced or detached during use, further improving the sealing performance. At the same time, by adjusting the size and material of the sealing ring, the special requirements of different users for the sealing performance can be met. Moreover, the replacement and maintenance of the sealing ring are relatively simple. When the sealing ring is worn or aged, it can be taken out of the mounting groove and replaced with a new sealing ring. This reduces the maintenance cost and time, improves the reliability and service life of the equipment.

[0020] Further, the adjusting structure comprises:

[0021] The bracket is arranged on the valve cover;

[0022] a valve stem provided with external threads at one end and a hand wheel at the other end;

[0023] a mounting seat provided on the valve plate and threadedly engaged with the valve stem;

[0024] wherein the valve plate can be moved up and down by the valve stem through rotating the hand wheel.

[0025] The bracket is provided on the valve cover as a support structure for the valve stem and the mounting seat, to ensure the stability and accuracy of the valve stem during installation and use. One end of the valve stem is provided with external threads for threadedly engaging with the mounting seat, and the other end is provided with a hand wheel for easy user operation. The valve stem is made of high-strength, corrosion-resistant material to ensure its reliability and durability during long-term use. The mounting seat is provided on the valve plate and threadedly engaged with the valve stem. The valve stem and the valve plate are connected through thread engagement, realizing the conversion of the rotary motion of the valve stem into the up-and-down movement of the valve plate.

[0026] By rotating the hand wheel, the user can accurately control the rotation of the valve stem and thus the up-and-down movement distance of the valve plate, so that the user can accurately open and close the valve according to actual needs. The design of the hand wheel allows the user to control the opening and closing of the valve through manual operation, reducing the operation difficulty and cost and improving the work efficiency.

[0027] Further, the mounting seat comprises:

[0028] a limiting base which is a block with a square cross-section;

[0029] a connecting protrusion provided on the limiting base and in the shape of a cylinder, with a threaded hole penetrating through the limiting base and adapted to the external threads of the valve stem;

[0030] wherein the valve stem is further provided with a limiting slot adapted to the mounting seat.

[0031] The limiting base is a block with a square cross-section, serving as the base part of the mounting seat, providing stable support and limiting the movement of the valve stem in the horizontal direction. The connecting protrusion is provided on the limiting base and in the shape of a cylinder, with a threaded hole penetrating through the limiting base and adapted to the external threads of the valve stem, ensuring the firm connection between the valve stem and the mounting seat. The limiting slot is provided on the valve stem and adapted to the mounting seat, ensuring the connection between the valve stem and the valve plate. Moreover, the limiting base and the connecting protrusion are an integral structure, simplifying the production process and reducing the production cost. The mounting seat and the limiting slot are connected through insertion, so that when the mounting seat is worn or damaged, the user can easily disassemble and replace the entire mounting seat without the need to replace the threaded part separately, reducing the maintenance cost and time and improving the reliability and service life of the equipment.

[0032] Further, the valve plate is also provided with a movable groove for the movement of the valve stem, which is in communication with the threaded hole.

[0033] In the flat gate valve, the valve plate is the key component for controlling fluid flow. In order to ensure that the valve stem can smoothly drive the valve plate to move up and down, while avoiding unnecessary interference between the valve stem and the valve plate, the present application provides a movable groove on the valve plate. The diameter of the movable groove is larger than that of the valve stem to avoid friction, and its position matches the movement path of the valve stem to ensure smooth movement of the valve stem. The movable groove is in communication with the threaded hole, and the valve stem can move freely in a linear manner on the valve plate when it rotates and moves up and down.

[0034] The movable groove effectively avoids interference between the valve stem and the valve plate. During the movement of the valve plate driven by the valve stem, the movable groove provides sufficient space for the valve stem, preventing damage or jamming caused by friction or collision. Since the movable groove is in communication with the threaded hole, the valve stem can smoothly pass through the movable groove and move up and down along the threaded hole, ensuring the stability and accuracy of the valve plate during opening and closing.

[0035] Further, the valve body and the valve cover are provided with a packing between them, and the valve body and the valve cover are fixed by a plurality of bolts.

[0036] The packing is arranged at the joint surface between the valve body and the valve cover, and is made of soft and wear-resistant materials such as graphite, asbestos or polytetrafluoroethylene, etc. It is used to fill the small gap between the valve body and the valve cover, prevent fluid leakage, and ensure the sealing performance of the valve. The bolts are arranged in multiple, uniformly distributed on the joint surface of the valve body and the valve cover, used to tightly connect the valve body and the valve cover together, preventing them from being separated under the action of fluid pressure.

[0037] The use of packing effectively fills the gap between the valve body and the valve cover, preventing fluid leakage and ensuring the sealing performance of the valve, thereby ensuring the normal flow and control of fluid. Through the uniform distribution and pre-tightening of multiple bolts, the connection between the valve body and the valve cover can be made more firm, enhancing the overall strength and stability of the valve body, so that it can withstand higher fluid pressure and more severe working environment.

[0038] The beneficial effects of the present application are:

[0039] 1. By setting the adjusting structure, when the adjusting structure drives the valve plate to contact with the sealing structure, the valve plate will extrude the sealing structure on both sides, forming a tight left sealing surface and a right sealing surface, ensuring the sealing performance of the valve body in the closed state, effectively preventing leakage problems;

[0040] 2、By setting the mounting seat, both the valve plate and the valve rod are connected, and when the mounting seat is worn or damaged, the user can easily disassemble and replace the entire mounting seat without the need to replace the threaded part alone, reducing maintenance cost and time, improving the reliability and service life of the equipment;

[0041] 3、The setting of the movable groove effectively avoids the interference between the valve rod and the valve plate. In the process of moving the valve plate driven by the valve rod, the movable groove provides sufficient space for the valve rod, preventing damage or jamming caused by friction or collision. BRIEF DESCRIPTION OF DRAWINGS

[0042] Figure 1 is a structural schematic diagram of the utility model;

[0043] Figure 2 is a schematic diagram of the internal structure of the utility model;

[0044] Figure 3 is another schematic diagram of the internal structure of the utility model;

[0045] Figure 4 is a sectional view of the utility model.

[0046] In the drawing, the reference signs are: 100, valve body; 110, left valve seat; 120, right valve seat; 200, valve cover; 300, valve plate; 310, sealing area; 320, water passing area; 330, movable groove; 400, adjusting structure; 410, bracket; 420, valve rod; 430, hand wheel; 440, mounting seat; 441, limiting base; 442, connecting protrusion; 450, limiting clamping groove; 500, sealing structure; 510, first sealing ring; 520, first mounting groove; 530, second sealing ring; 540, second mounting groove; 600, filler. DETAILED DESCRIPTION

[0047] The technical solutions in the embodiments of the present application will be clearly described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art belong to the scope of protection of the present application.

[0048] The terms "first", "second", etc. in the specification and claims of the present application are used to distinguish similar objects, and are not used to describe a specific order or sequence. It should be understood that the data used in this way can be exchanged under appropriate circumstances, so that the embodiments of the present application can be implemented in an order other than those illustrated or described herein, and the objects distinguished by "first", "second", etc. are generally a class and do not limit the number of objects, for example, the first object can be one or more. In addition, "and / or" in the specification and claims indicates at least one of the connected objects, and the character " / " generally indicates that the objects before and after are in an "or" relationship.

[0049] The flat gate valve provided by the embodiments of the present application will be described in detail below in combination with the drawings, specific embodiments and application scenarios.

[0050] Embodiment 1

[0051] As shown in Figures 1 to 4 The embodiments of the present application provide a flat gate valve, which comprises:

[0052] A valve body 100, which is internally provided with a left valve seat 110 and a right valve seat 120;

[0053] A valve cover 200, which is arranged on the valve body 100;

[0054] A valve plate 300, which is arranged on the valve body 100 and comprises a sealing area 310 and a water passing area 320, and the water passing area 320 is circular;

[0055] An adjusting structure 400, which is arranged on the valve cover 200 and connected with the valve plate 300, and is used for controlling the up and down movement of the valve plate 300;

[0056] A sealing structure 500, which is arranged on the left valve seat 110 and the right valve seat 120;

[0057] When the adjusting structure 400 drives the valve plate 300 to contact the sealing structure 500, the gate plate extrudes the sealing structure 500 on both sides and forms a left sealing surface and a right sealing surface.

[0058] In some embodiments of the embodiments of the present application, as Figure 1As shown, the aforementioned flat gate valve, through the setting of the adjusting structure 400, when the adjusting structure 400 drives the valve plate 300 to contact the sealing structure 500, the valve plate 300 will squeeze the sealing structures 500 on both sides, forming a tight left and right sealing surface, ensuring the sealing performance of the valve body 100 in the closed state and effectively preventing leakage problems. The valve plate 300 includes a sealing area 310 and a water passage area 320, wherein the water passage area 320 is circular. This structure is not only aesthetically pleasing but also helps to enhance the overall stability of the valve body 100. At the same time, the connection design between the adjusting structure 400 and the valve plate 300 ensures the smoothness and accuracy of the valve plate 300 during movement.

[0059] Furthermore, a packing 600 is provided between the valve body 100 and the valve cover 200, and the valve body 100 and the valve cover 200 are fixed together by multiple bolts.

[0060] Packing 600 is disposed at the mating surface between the valve body 100 and the valve cover 200, and is made of a soft and wear-resistant material, such as graphite, asbestos, or polytetrafluoroethylene, to fill the tiny gaps between the valve body 100 and the valve cover 200, prevent fluid leakage, and ensure the valve's sealing performance. Multiple bolts are provided, evenly distributed on the mating surface between the valve body 100 and the valve cover 200, to tightly connect the valve body 100 and the valve cover 200 together, preventing them from separating under fluid pressure.

[0061] The use of packing 600 effectively fills the gap between valve body 100 and valve cover 200, preventing fluid leakage and ensuring the valve's sealing performance, thereby guaranteeing normal fluid flow and control. The even distribution and pre-tightening of multiple bolts makes the connection between valve body 100 and valve cover 200 more robust, enhancing the overall strength and stability of valve body 100, enabling it to withstand higher fluid pressures and harsher working environments.

[0062] Example 2:

[0063] This application provides a flat gate valve, which, in addition to the above-mentioned technical features, also includes the following technical features.

[0064] like Figures 2 to 4 As shown, the sealing structure 500 includes:

[0065] A first sealing ring 510 is disposed on a left valve seat 110, and a first mounting groove 520 adapted to the first sealing ring 510 is provided on the left valve seat 110.

[0066] The second sealing ring 530 is disposed on the valve seat, and the right valve seat 120 is provided with a second mounting groove 540 that is adapted to the second sealing ring 530.

[0067] The first sealing ring 510 and the second sealing ring 530 are made of rubber and have elasticity. The valve plate 300 is in contact with the first sealing ring 510 and the second sealing ring 530, and the two are pressed on the respective installation grooves, thereby achieving sealing.

[0068] In the embodiment of the present application, the first sealing ring 510 is made of rubber and has good elasticity and wear resistance. It is arranged on the left valve seat 110 and closely adheres to the left valve seat 110. The left valve seat 110 is provided with a first installation groove 520 matched with the first sealing ring 510, which ensures that the sealing ring will not shift or fall off during installation. The second sealing ring 530 is also made of rubber and has the same material as the first sealing ring 510, which ensures the stability of the sealing performance. It is arranged on the right valve seat 120 and closely adheres to the right valve seat 120. The right valve seat 120 is provided with a second installation groove 540 matched with the second sealing ring 530, which ensures the stable installation of the sealing ring.

[0069] The first sealing ring 510 and the second sealing ring 530 are made of rubber and have excellent elasticity and recovery. When the valve plate 300 is in contact with the sealing ring, the sealing ring can be deformed by the extrusion of the valve plate 300 and fill the small gap between the valve plate 300 and the valve seat, thereby achieving a tight sealing effect. By arranging the installation groove matched with the sealing ring, the stability and accuracy of the sealing ring during installation are ensured, which helps to prevent the sealing ring from shifting or falling off during use, further improving the sealing performance. At the same time, by adjusting the size and material of the sealing ring, the special requirements of different users for the sealing performance can be met. Moreover, the replacement and maintenance of the sealing ring are relatively simple. When the sealing ring is worn or aged, it only needs to be taken out of the installation groove and replaced with a new sealing ring. This reduces the maintenance cost and time, improves the reliability and service life of the equipment.

[0070] Embodiment 3:

[0071] The embodiment of the present application provides a flat gate valve. In addition to the above technical features, the flat gate valve of the embodiment of the present application further comprises the following technical features.

[0072] As shown in Figures 1 to 4 , the adjusting structure 400 comprises:

[0073] The bracket 410 is arranged on the valve cover 200;

[0074] The valve stem 420 is provided with external threads at one end and a hand wheel 430 at the other end;

[0075] The mounting seat 440 is arranged on the valve plate 300 and threadedly cooperates with the valve stem 420;

[0076] The valve plate 300 can be driven to move up and down by the valve stem 420 by rotating the hand wheel 430.

[0077] In the embodiments of the present application, the support 410 is arranged on the valve cover 200 as a support structure for the valve stem 420 and the mounting seat 440, for ensuring the stability and accuracy of the valve stem 420 during installation and use. One end of the valve stem 420 is provided with external threads for threaded cooperation with the mounting seat 440, and the other end is provided with a hand wheel 430 for easy user operation. The valve stem 420 is made of high-strength, corrosion-resistant material to ensure its reliability and durability during long-term use. The mounting seat 440 is arranged on the valve plate 300 and threaded with the valve stem 420. The valve stem 420 is connected with the valve plate 300 by threaded cooperation, realizing the conversion of the rotary motion of the valve stem 420 into the up-down movement of the valve plate 300.

[0078] By rotating the hand wheel 430, the user can accurately control the rotation of the valve stem 420 and thus the up-down movement distance of the valve plate 300, so that the user can accurately open and close the valve according to actual needs. The design of the hand wheel 430 allows the user to control the opening and closing of the valve by manual operation, reducing the operation difficulty and cost and improving the work efficiency.

[0079] Embodiment 4:

[0080] The embodiments of the present application provide a flat gate valve, in addition to the above technical features, the flat gate valve of the embodiments of the present application further comprises the following technical features.

[0081] As shown in Figures 2 to 4 The mounting seat 440 comprises:

[0082] The limiting base 441 is a block with a square cross-section;

[0083] The connecting protrusion 442 is arranged on the limiting base 441 and is cylindrical, and a threaded hole penetrating through the limiting base 441 is formed on the surface of the connecting protrusion 442, which is adapted to the external threads of the valve stem 420;

[0084] Among them, the valve stem 420 is further provided with a limiting clamping groove 450 adapted to the mounting seat 440.

[0085] In the embodiments of the present application, the limiting base 441 is a block with a square cross-section, serving as the base part of the mounting seat 440, providing stable support and limiting the movement of the valve stem 420 in the horizontal direction. The connecting protrusion 442 is provided on the limiting base 441 and is cylindrical in shape, with a threaded hole penetrating through the limiting base 441 and matching the external threads of the valve stem 420, ensuring the firm connection between the valve stem 420 and the mounting seat 440. The limiting clamping groove 450 is provided on the valve stem 420 and matches the mounting seat 440, ensuring the connection between the valve stem 420 and the valve plate 300. The limiting base 441 and the connecting protrusion 442 are an integral structure, simplifying the production process and reducing production costs. The mounting seat 440 and the limiting clamping groove 450 are connected by insertion, and when the threads of the mounting seat 440 are worn or damaged, the user can easily disassemble and replace the entire mounting seat 440 without the need to replace the threaded part separately, reducing maintenance costs and time and improving the reliability and service life of the equipment.

[0086] Further, the valve plate 300 is also provided with a movable groove 330 for the movement of the valve stem 420, which communicates with the threaded hole.

[0087] In some embodiments of the present application, in a flat gate valve, the valve plate 300 is a key component for controlling fluid flow. In order to ensure that the valve stem 420 can smoothly drive the valve plate 300 to move up and down, while avoiding unnecessary interference between the valve stem 420 and the valve plate 300, the present application provides a movable groove 330 on the valve plate 300. The diameter of the movable groove 330 is greater than that of the valve stem 420 to avoid friction with the valve stem 420, and its position matches the movement path of the valve stem 420 to ensure that the valve stem 420 can smoothly pass through during movement. The movable groove 330 communicates with the threaded hole, and the valve stem 420 can perform free linear motion on the valve plate 300 when rotating and moving up and down through the movable groove 330.

[0088] The provision of the movable groove 330 effectively avoids interference between the valve stem 420 and the valve plate 300. During the movement of the valve plate 300 driven by the valve stem 420, the movable groove 330 provides sufficient space for the valve stem 420, preventing damage or jamming due to friction or collision. Since the movable groove 330 communicates with the threaded hole, the valve stem 420 can smoothly pass through the movable groove 330 and move up and down along the threaded hole, ensuring the stability and accuracy of the valve plate 300 during opening and closing.

[0089] It should be noted that, in the present document, the terms "comprises", "comprising", or any other variations thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but can also include other elements not expressly listed or inherent to such process, method, article, or apparatus. An element proceeded by "comprises... a" does not, without more constraints, exclude the presence of additional identical elements in the process, method, article, or apparatus that comprises the element. Furthermore, it is to be understood that the method and apparatus of the present application can be carried out by someone other than the person named in the independent claims, and that the scope of the independent claims is not limited to the person named in the independent claims. In addition, it should be noted that the scope of the method and apparatus of the present application is not limited to performing the functions in the order discussed or illustrated, but can also include performing the functions in a substantially simultaneous manner or in a reverse order, for example, the described method can be performed in an order different from that described, and various steps can be added, omitted, or combined, in addition, features described with reference to certain examples can be combined in other examples.

[0090] The embodiments of the present application described above are merely illustrative, and are not intended to limit the present application, and the specific embodiments described above are merely illustrative, and are not intended to limit the present application, and the person of ordinary skill in the art can make many forms under the inspiration of the present application without departing from the purpose of the present application and the scope protected by the claims, and all forms belong to the protection of the present application.

Claims

1. A flat gate valve, characterized by: The utility model relates to a valve, which comprises: a valve body (100) internally provided with a left valve seat (110) and a right valve seat (120); a valve cover (200) arranged on the valve body (100); a valve plate (300) arranged on the valve body (100) and comprising a sealing area (310) and a water passing area (320) in a circular shape; an adjusting structure (400) arranged on the valve cover (200) and connected with the valve plate (300) for controlling the up-and-down movement of the valve plate (300); a sealing structure (500) arranged on the left valve seat (110) and the right valve seat (120); wherein, when the adjusting structure (400) drives the valve plate (300) to contact the sealing structure (500), the valve plate extrudes the sealing structure (500) on both sides and forms left and right sealing surfaces; the sealing structure (500) comprises: a first sealing ring (510) arranged on the left valve seat (110), which is provided with a first mounting groove (520) matched with the first sealing ring (510); a second sealing ring (530) arranged on the right valve seat (120), which is provided with a second mounting groove (540) matched with the second sealing ring (530); wherein, the first sealing ring (510) and the second sealing ring (530) are made of rubber and have elasticity, and the valve plate (300) presses the first sealing ring (510) and the second sealing ring (530) tightly on the respective mounting grooves after contacting them, thereby achieving sealing; the adjusting structure (400) comprises: a support (410) arranged on the valve cover (200); a valve rod (420) provided with external threads at one end and a hand wheel (430) at the other end; a mounting seat (440) arranged on the valve plate (300) and threadedly matched with the valve rod (420); wherein, the valve plate (300) can be moved up and down by the valve rod (420) through the rotation of the hand wheel (430); the mounting seat (440) comprises: a limiting base (441) in the shape of a block with a square cross section; a connecting protrusion (442) arranged on the limiting base (441) and in the shape of a cylinder, which is provided with a threaded hole penetrating through the limiting base (441) and matched with the external threads of the valve rod (420); wherein, the valve rod (420) is further provided with a limiting clamping groove (450) matched with the mounting seat (440); the valve plate (300) is further provided with a movable groove (330) for the movement of the valve rod (420), which is in communication with the threaded hole; the valve body (100) and the valve cover (200) are provided with a packing (600) therebetween, and the valve body (100) and the valve cover (200) are fixed by a plurality of bolts.

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