Self-heat dissipation gate valve

Abstract

A self-heat dissipation gate valve, comprising a valve body (1), a valve cover (2), a gate plate (3), and a valve rod (4). The valve body comprises a channel (11) and a valve seat (12) located on the channel. The valve cover is fixedly connected to the valve body, and a plurality of cooling fins (21) are arranged at intervals on the outer side wall of the valve cover. The gate plate is located in an inner cavity of the valve body. One end of the valve rod is connected to the gate plate, and the other end of the valve rod extends upwards until the other end of the valve rod partially extends out of the valve cover. The gate plate is configured to be driven by the valve rod to move to be mated with the valve seat to block the channel or is configured to be driven by the valve rod to move in a direction away from the valve seat to unblock the channel. During use, the high-temperature medium in the channel of the valve body can transfer heat to the valve body and the valve cover, and the plurality of cooling fins arranged on the valve cover can diffuse heat into the surrounding environment, so that the working performance of the gate valve is prevented from being affected by the excessively high temperature of the gate valve.

Description

Self-heating gate valve

[0001] CROSS-REFERENCE TO RELATED APPLICATIONS

[0002] This application claims priority to the Chinese patent application filed with the China Patent Office on October 8, 2023, with application number 202311291179.6 and invention name “Self-heat relieving gate valve”, the entire contents of which are incorporated by reference into this application. Technical Field

[0003] The present application relates to the field of mechanical engineering technology, and in particular to a self-heating gate valve. Background Art

[0004] Forged steel gate valve is a gate with a wide range of uses. Its main function is to cut off the pipeline. It can be used to control the flow of various types of fluids such as air, water, steam, various corrosive media, mud, oil, liquid metal and radioactive media.

[0005] Prior art forged steel gate valves consist of at least a valve body, a valve stem, and a gate. The gate, driven by the valve stem, blocks or opens the passageway in the valve body, thereby controlling the flow of media. However, existing forged steel gate valves suffer from poor heat dissipation and are not fully suitable for use with high-temperature media pipelines. High-temperature media significantly impact their performance.

[0006] Summary of the Invention

[0007] Therefore, the technical problem to be solved by this application is to overcome the defects of the forged steel gate valve in the prior art, which has poor heat dissipation and cannot be fully applied to high-temperature medium pipelines, and the high-temperature medium has a great impact on the working performance of the forged steel gate valve, thereby providing a self-heating gate valve.

[0008] In order to solve the above problems, the present application provides a self-heating gate valve, comprising: a valve body, comprising a channel and a valve seat located on the channel; a valve cover, fixedly connected to the valve body, and a plurality of heat dissipation fins are arranged at intervals on the outer side wall of the valve cover; a gate plate and a valve stem, the gate plate being located in the inner cavity of the valve body, one end of the valve stem being connected to the gate plate, and the other end extending upward to partially protrude from the valve cover, the gate plate being suitable for moving under the drive of the valve stem to cooperate with the valve seat to block the channel, or, moving in a direction away from the valve seat under the drive of the valve stem to open the channel.

[0009] Optionally, the outer side wall of the valve cover has a plurality of grooves arranged at intervals, the depths of the plurality of grooves are different, and the heat sink is formed between two adjacent grooves.

[0010] Optionally, the groove is a through groove extending circumferentially along the outer side wall of the valve cover, a plurality of the grooves are spaced apart along the axial direction of the valve cover, the heat sink is annular, and the areas of the upper and lower end surfaces are different.

[0011] Optionally, the groove is a strip-shaped groove extending in the height direction, a plurality of the grooves are arranged at intervals along the circumference of the valve cover, and the areas of the heat sink relative to the two end surfaces are different.

[0012] Optionally, the valve cover has an axial hole, the valve stem extends outward from the inner cavity of the valve body through the axial hole, a packing part is provided on the axial hole, the packing part includes a packing groove and a packing pressing piece, and the packing pressing piece is suitable for pressing the packing in the packing groove.

[0013] Optionally, the filler includes an upper filler and a lower filler, the filler portion includes a spacer ring located between the upper filler and the lower filler, the lower filler is a high-temperature resistant material filler, and the upper filler is a graphite filler.

[0014] Optionally, a first positioning hole is provided on the valve cover, and the packing pressing piece includes: a sleeve, which is sleeved on the valve stem and presses the packing; a pressure block, which is sleeved on the valve stem and has its bottom abutted against the top of the sleeve, and a second positioning hole is provided on the pressure block; a first fixing piece, which passes through the second positioning hole and the first positioning hole in sequence, and an elastic piece is pre-pressed between the top of the first fixing piece and the pressure block.

[0015] Optionally, the first positioning hole and the second positioning hole are threaded holes, the first fixing member is a screw, the elastic member is a disc spring, and the disc spring is pre-pressed between the pressure block and the nut or the nut on the top of the screw.

[0016] Optionally, the gate valve includes a driving part, which includes: a mounting seat connected to the valve cover through a column, and the column supports the mounting seat at a certain distance from the valve cover; a driving member, and the other end of the valve stem extends to be transmission-connected to the driving member.

[0017] Optionally, the driving portion includes an indicator cover, which is arranged along the extension direction of the valve stem, and has corresponding valve stem position indication information at different height positions of the indicator cover.

[0018] Optionally, a countersunk hole is provided on the mounting seat, and one end of the column is fixed in the countersunk hole of the mounting seat.

[0019] Optionally, the driving member is a gear box, the gear box is transmission-connected to the valve stem, and the driving part includes a handwheel transmission-connected to the gear box.

[0020] Optionally, a connecting groove is provided in the gate plate, the connecting groove has an annular step, the bottom size of the connecting groove is larger than the opening size of the connecting groove, and the valve stem is connected to the connecting groove through a connecting piece with a T-shaped cross-section.

[0021] Optionally, the bottom of the connecting groove is hexagonal in shape.

[0022] Optionally, an elastic groove is provided on the side of the gate plate.

[0023] Optionally, a flange is connected to the side of the valve body, and the radius of the flange is half of the center height of the valve body.

[0024] This application has the following advantages:

[0025] The self-heating gate valve provided in the present application includes: a valve body, a valve cover, a gate plate and a valve stem. The valve body includes a channel and a valve seat located on the channel. The valve cover is fixedly connected to the valve body, and a plurality of heat sinks are arranged at intervals on the outer wall of the valve cover. The gate plate is located in the inner cavity of the valve body, one end of the valve stem is connected to the gate plate, and the other end extends upward to partially protrude from the valve cover. The gate plate is suitable for moving under the drive of the valve stem to cooperate with the valve seat to block the channel, or, under the drive of the valve stem, to move in a direction away from the valve seat to open the channel. During use, the high-temperature medium in the valve body channel will transfer heat to the valve body and the valve cover. The multiple heat sinks arranged on the valve cover can diffuse the heat into the surrounding environment to prevent the gate valve from overheating and affecting its working performance. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] In order to more clearly illustrate the specific implementation methods of the present application or the technical solutions in the prior art, the following is a brief introduction to the drawings required for use in the specific implementation methods or the description of the prior art. Obviously, the drawings described below are some implementation methods of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without any creative work.

[0027] FIG1 is a schematic structural diagram of a gate valve in an embodiment of the present application;

[0028] FIG2 is a partial cross-sectional view of the valve cover in an embodiment of the present application;

[0029] Figure 3 is an enlarged view of point A in Figure 1;

[0030] FIG4 is a top view of the top of the valve cover in FIG1 ;

[0031] FIG5 is a top view of the top of the mounting base in FIG1 ;

[0032] Figure 6 is an enlarged view of point B in Figure 1;

[0033] Figure 7 is a schematic structural diagram of the gate;

[0034] FIG8 is a top view of the gate;

[0035] Figure 9 is a schematic structural diagram of the elastic groove on the side of the gate;

[0036] Figure 10 is a schematic diagram of the height dimensions of the flange and the valve body center;

[0037] Figure 11 is a schematic diagram of the flange and valve body thickness dimensions.

[0038] Description of reference numerals:

[0039] 1. Valve body; 11. Channel; 12. Valve seat; 13. Flange; 2. Valve cover; 21. Heat sink; 22. Groove; 231. Upper packing; 232. Lower packing; 233. Spacer ring; 24. First positioning hole; 251. Bushing; 252. Pressure block; 253. Second positioning hole; 254. First fixing member; 255. Elastic member; 3. Gate; 31. Connecting groove; 32. Connecting member; 33. Elastic groove; 4. Valve stem; 41. Shaft hole; 5. Mounting seat; 51. Column; 52. Countersunk hole; 53. Third positioning hole; 54. Second fixing member; 61. Driving member; 62. Handwheel; 7. Indicator cover. DETAILED DESCRIPTION

[0040] The following will clearly and completely describe the technical solution of this application in conjunction with the accompanying drawings. Obviously, the embodiments described are only part of the embodiments of this application, not all of them. Based on the embodiments in this application, all other embodiments obtained by ordinary technicians in this field without making any creative efforts are within the scope of protection of this application.

[0041] In the description of this application, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings and are intended solely to facilitate the description of this application and simplify the description. They do not indicate or imply that the devices or components referred to must have a specific orientation, be constructed, or operate in a specific orientation. Therefore, they should not be construed as limitations on this application. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0042] In the description of this application, it should be noted that, unless otherwise expressly specified or limited, the terms "installed," "connected," and "connected" should be understood in a broad sense. For example, they can refer to fixed connections, detachable connections, or integral connections; mechanical connections or electrical connections; direct connections or indirect connections through an intermediate medium; and internal connections between two components. Those skilled in the art will understand the specific meanings of the above terms in this application based on specific circumstances.

[0043] In addition, the technical features involved in the different embodiments of the present application described below can be combined with each other as long as they do not conflict with each other.

[0044] With reference to Figures 1 and 2, in one embodiment of the present application, the self-heating gate valve provided by the present application includes: a valve body 1, a valve cover 2, a gate plate 3, and a valve stem 4. The valve body 1 includes a channel 11 and a valve seat 12 located on the channel 11. The valve cover 2 is fixedly connected to the valve body 1, and a plurality of heat dissipation fins 21 are arranged at intervals on the outer wall of the valve cover 2. The gate plate 3 is located in the inner cavity of the valve body 1, and one end of the valve stem 4 is connected to the gate plate 3, and the other end extends upward to partially protrude from the valve cover 2. The gate plate 3 is suitable for moving under the drive of the valve stem 4 to cooperate with the valve seat 12 to block the channel 11, or, under the drive of the valve stem 4, to move in a direction away from the valve seat 12 to open the channel 11.

[0045] Specifically, the valve body 1 and the valve cover 2 can be made of high-temperature resistant materials, for example, high-temperature resistant materials that can withstand temperatures of 550°C and above. A groove can be provided on the top of the valve body 1, and a ridge can be provided at a corresponding position on the bottom of the valve cover 2. During installation, the ridge of the valve cover 2 contacts and limits the groove of the valve body 1, and the valve cover 2 is fixed to the valve body 1 by bolts. The groove can be an annular groove, and a sealing gasket is provided at the bottom of the groove. The ridge of the valve cover 2 is an annular ridge that matches the shape of the groove. The annular ridge is pressed against the sealing gasket to ensure the sealing between the valve cover 2 and the valve body 1. There is a valve cavity between the valve cover 2 and the valve body 1 that allows the gate plate 3 to move. After the gate plate 3 extends from the valve cavity, it cooperates with the valve seat 12 to block the channel 11. After the gate plate 3 retracts into the valve cavity, it leaves the valve seat 12 and opens the channel 11. The gate valve provided in this application is suitable for controlling the on-off of high-temperature medium pipelines, and the high-temperature working environment will not affect the working performance of the gate valve.

[0046] There are two valve seats 12, which are arranged opposite each other in the channel 11. The gate 3 is cylindrical with a wedge-shaped cross-section and can contact and cooperate with the two valve seats 12 to block the channel 11 and prevent the flow of medium. The heat sink 21 can be integrally formed with the valve cover 2. For example, multiple heat sinks 21 can be machined on the side wall of the valve cover 2. The heat sink 21 can increase the contact area between the valve cover 2 and the outside world, thereby facilitating heat dissipation.

[0047] During use, the high-temperature medium in the valve body 1 channel 11 will transfer heat to the valve body 1 and the valve cover 2. The multiple heat sinks 21 provided on the valve cover 2 can diffuse the heat to the surrounding environment to prevent the gate valve temperature from being too high and affecting the working performance of the gate valve.

[0048] Referring to Figures 1 and 2, in one embodiment of the present application, the outer wall of the valve cover 2 has multiple spaced grooves 22, each of varying depths. Fins 21 are formed between adjacent grooves 22. For example, multiple grooves 22 can be arranged parallel and spaced apart to form multiple parallel fins 21. The varying depths of adjacent grooves 22 allow for different heat dissipation areas at each end of the fins 21, enhancing heat dissipation. Forming multiple fins 21 by machining multiple grooves 22 on the outer wall of the valve cover 2 reduces manufacturing difficulty and cost.

[0049] With reference to Figures 1 and 2, in one embodiment of the present application, the grooves 22 are through-grooves extending circumferentially along the outer wall of the valve cover 2. Multiple grooves 22 are spaced apart along the axial direction of the valve cover 2. The heat sink 21 is annular, with upper and lower end surfaces having different areas. For example, four grooves 22 may be formed on the outer wall of the valve cover 2. The depth of the grooves 22 may increase from top to bottom, or may be shallower to deeper to shallower, as long as the depths of adjacent grooves 22 are different. This results in different heat dissipation areas at opposite ends of the heat sink 21, thereby enhancing heat dissipation.

[0050] In another specific embodiment of the present application, the grooves are strip-shaped grooves extending in the height direction, and multiple grooves are spaced apart along the circumference of the valve cover, with the heat sinks having different areas relative to the two end surfaces. For example, the multiple grooves surround the outer wall of the valve cover along the circumference of the valve cover, forming multiple heat sinks that also surround the outer wall of the valve cover along the circumference of the valve cover, with the heat sinks having different heat dissipation areas at opposite ends, thereby enhancing the heat dissipation effect.

[0051] Referring to Figures 1 and 3 , in one embodiment of the present application, the valve cover 2 has an axial hole 41. The valve stem 4 extends outward from the inner cavity of the valve body 1 through the axial hole 41. A packing portion is provided in the axial hole 41. The packing portion includes a packing groove and a packing pressing member. The packing pressing member is suitable for pressing the packing in the packing groove. The packing portion ensures the sealing of the valve cover 2.

[0052] Referring to Figures 1 and 3 , in one embodiment of the present application, the packing includes an upper packing 231 and a lower packing 232. The packing portion includes a spacer ring 233 positioned between the upper and lower packings 231 and 232. The lower packing 232 is made of a high-temperature resistant material, while the upper packing 231 is made of graphite. Because the medium temperature may exceed 550°C, the lower packing is filled with a high-temperature resistant material to withstand the high temperatures of the gate. Combined with the heat sink 21 of the valve cover 2, this reduces the temperature of the valve cover 2. Graphite filler can be added to the upper packing 231. The graphite filler is kept at a normal operating temperature, ensuring sealing and preventing ablation.

[0053] Referring to Figures 1 and 3 , in one embodiment of the present application, a first positioning hole 24 is provided on the valve cover 2, and the packing pressure member includes a sleeve 251, a pressure block 252, and a first fixing member 254. The sleeve 251 is mounted on the valve stem 4 and compresses the packing. The pressure block 252 is mounted on the valve stem 4, with its bottom abutting the top of the sleeve 251. A second positioning hole 253 is provided on the pressure block 252. The first fixing member 254 sequentially passes through the second positioning hole 253 and the first positioning hole 24. An elastic member 255 is pre-compressed between the top of the first fixing member 254 and the pressure block 252.

[0054] Specifically, the sleeve 251 is cylindrical and has a flange on the top. The pressure block 252 has a circular hole in the middle, through which the valve stem 4 passes. The bottom of the pressure block 252 abuts the top of the sleeve 251. For example, as shown in Figure 4, the edge of the pressure block is provided with two second positioning holes 253, and the top of the corresponding valve cover 2 has two first positioning holes 24. The two first fixing members 254 can respectively pass through the corresponding second positioning holes 253 and first positioning holes 24 to press the pressure block 252 onto the sleeve 251, thereby allowing the sleeve 251 to be pressed against the packing to ensure the sealing of the packing. The elastic member 255 is pre-pressed between the top of the first fixing member 254 and the pressure block 252. When the packing is damaged, the elastic force of the elastic member 255 can continue to provide pressure to the pressure block 252, so that the pressure block 252 and the sleeve 251 are pressed toward the packing to ensure the sealing.

[0055] Referring to Figure 3, in one embodiment of the present application, the first positioning hole 24 and the second positioning hole 253 are threaded holes, the first fixing member 254 is a screw, and the elastic member 255 is a disc spring. The disc spring is pre-loaded between the pressure block 252 and the cap or nut on the top of the screw. The screw can be inserted through the two threaded holes in sequence, and then the disc spring transmits pressure to the pressure block 252. The screw can have a nut or a nut threaded on the top of the screw to provide pressure to the disc spring.

[0056] Referring to Figure 1 , in one embodiment of the present application, a gate valve includes a drive unit comprising a mounting base 5 and a drive member 61. The mounting base 5 is connected to the valve cover 2 via a column 51, which supports the mounting base 5 at a predetermined distance from the valve cover 2. The other end of the valve stem 4 extends to a position in driving connection with the drive member 61.

[0057] For example, as shown in Figures 1 and 5, the mounting base 5 is mounted on the valve cover 2 via four columns 51, thereby preventing heat from the valve cover 2 from being transferred to the mounting base 5. At the same time, the top of the valve cover 2 is exposed, thereby increasing the heat dissipation area of ​​the valve cover 2. The valve stem 4 extends from the valve cavity and then connects to the driver 61, which can drive the valve stem 4 to move toward or away from the valve cavity.

[0058] 1 and 5 , in one embodiment of the present application, a countersunk hole 52 is provided on the mounting base 5, and one end of the column 51 is fixed in the countersunk hole 52 of the mounting base 5. Specifically referring to FIG5 , the mounting base 5 can be a connecting flange having four countersunk holes 52 provided on the connecting flange, and one end of the column 51 is fixed in the countersunk hole 52 via a nut. This can reduce the thickness of the connecting flange and make the overall structure more compact.

[0059] Referring to Figures 1 and 5 , in one embodiment of the present application, a drive member 61 is a gearbox, which is in driving connection with the valve stem 4. The drive unit includes a handwheel 62, which is in driving connection with the gearbox. To control the opening and closing of the valve, the handwheel 62 drives the gears of the gearbox to rotate, thereby moving the valve stem 4 toward or away from the valve chamber. Of course, the handwheel can also be replaced with a motor.

[0060] 1 and 5 , the mounting base 5 is provided with a third positioning hole 53, and the driver 61 is fixed to the mounting base 5 via a second fixing member 54. For example, four third positioning holes 53 may be evenly arranged along the circumference of the mounting base 5, and four second fixing members 54 may pass through their respective third positioning holes 53 to fix the driver 61 to the mounting base 5. The third positioning holes 53 may be threaded holes, and the second fixing members 54 may be screws.

[0061] Referring to FIG1 , in one embodiment of the present application, the drive unit includes an indicator cover 7 , which is arranged along the extension direction of the valve stem 4 . Positions at different heights of the indicator cover 7 indicate the corresponding positions of the valve stem 4 . For example, indicator marks indicating the valve open and closed positions are provided on the indicator cover 7 . When the top of the valve stem 4 reaches different indicator marks, the current valve open / close status can be determined.

[0062] With reference to Figures 6, 7, and 8, in one embodiment of the present application, a connecting groove 31 is provided in the gate plate 3. The connecting groove 31 has an annular step therein. The bottom dimension of the connecting groove 31 is larger than the opening dimension of the connecting groove 31. The valve stem is connected to the connecting groove 31 via a connecting piece 32 having a T-shaped cross section. The smaller end of the connecting piece 32 can be connected to the valve stem 4 by welding, while the larger end is installed in the connecting groove 31 of the gate plate 3. The connecting piece 32 abuts against the annular step in the connecting groove 31, preventing the gate plate 3 from separating from the connecting piece 32 and improving the stability of the connection.

[0063] Referring to Figures 6, 7, and 8, in one embodiment of the present application, the bottom of the connecting groove 31 is hexagonal. Accordingly, the larger end of the connecting member 32 also has a hexagonal cross-section. This ensures that the outer wall of the connecting member 32 abuts the corresponding inner wall of the connecting groove 31. The hexagonal shape ensures that the connecting member 32 provides stable and uniform pressure to the gate plate 3, while also preventing the gate plate 3 from rotating horizontally relative to the connecting member 32.

[0064] 6 and 9 , in one embodiment of the present application, an elastic groove 33 is provided on the side of the gate plate 3. For example, the gate plate 3 is cylindrical and can be processed from bar stock. The elastic groove 33 is located on the side of the gate plate 3 and is a 360-degree annular elastic groove. This ensures that the gate plate 3 can deform appropriately under external forces, preventing the gate plate 3 from being stuck on the valve seat 12 under high temperature conditions.

[0065] Referring to Figures 10 and 11 , in one embodiment of the present application, a flange 13 is connected to the side of the valve body 1. The radius of the flange 13 is half the center height of the valve body 1. For example, half the center height of the valve body 1 is H2, half the thickness of the valve body 1 is H3, and the radius of the flange 13 is H1. H1, H2, and H3 are all consistent. Using a design method where the flanges encompass the outer contour of the valve body, the amount of valve body blank used can be effectively reduced. The flange size can be determined according to the user's preference.

[0066] Obviously, the above embodiments are merely examples for clarity of explanation and are not intended to limit the implementation methods. Those skilled in the art will readily appreciate that other variations or modifications based on the above descriptions are possible. It is not necessary and impossible to enumerate all implementation methods here. Obvious variations or modifications arising therefrom remain within the scope of protection of this application.

Claims

1. A self-heating gate valve, characterized in that: include: A valve body (1) comprising a channel (11) and a valve seat (12) located on the channel (11); A valve cover (2) is fixedly connected to the valve body (1), and a plurality of cooling fins (21) are arranged at intervals on the outer side wall of the valve cover (2); A gate plate (3) and a valve stem (4), wherein the gate plate (3) is located in the inner cavity of the valve body (1), one end of the valve stem (4) is connected to the gate plate (3), and the other end extends upward to partially protrude from the valve cover (2), and the gate plate (3) is suitable for moving under the drive of the valve stem (4) to cooperate with the valve seat (12) to block the channel (11), or, under the drive of the valve stem (4), moving in a direction away from the valve seat (12) to open the channel (11).

2. The self-heating gate valve according to claim 1, characterized in that: The outer side wall of the valve cover (2) has a plurality of grooves (22) arranged at intervals, the depths of the plurality of grooves (22) are different, and the heat sink (21) is formed between two adjacent grooves (22).

3. The self-heating gate valve according to claim 2, characterized in that: The groove (22) is a through groove extending circumferentially along the outer wall of the valve cover (2), and a plurality of the grooves (22) are arranged at intervals along the axial direction of the valve cover (2). The heat sink (21) is annular, and the areas of the upper and lower end surfaces are different.

4. The self-heating gate valve according to claim 2, characterized in that: The groove (22) is a strip-shaped groove extending in the height direction, a plurality of the grooves (22) are arranged at intervals along the circumference of the valve cover (2), and the areas of the heat sink (21) relative to the two end surfaces are different.

5. The self-heating gate valve according to claim 1, characterized in that: The valve cover (2) has an axial hole (41), and the valve stem (4) extends outward from the inner cavity of the valve body (1) through the axial hole (41). A packing portion is provided on the axial hole (41), and the packing portion includes a packing groove and a packing pressing piece, and the packing pressing piece is suitable for pressing the packing in the packing groove.

6. The self-heating gate valve according to claim 5, characterized in that: The filler comprises an upper filler (231) and a lower filler (232); the filler portion comprises a spacer ring (233) located between the upper filler (231) and the lower filler (232); the lower filler (232) is a high temperature resistant material filler, and the upper filler (231) is a graphite filler.

7. The self-heating gate valve according to claim 5, characterized in that: The valve cover (2) is provided with a first positioning hole (24), and the packing pressing piece comprises: a sleeve (251) sleeved on the valve stem (4) and pressing the packing; a pressing block (252) sleeved on the valve stem (4) and with its bottom abutting against the top of the sleeve (251), and a second positioning hole (253) is provided on the pressing block (252); a first fixing piece (254) passing through the second positioning hole (253) and the first positioning hole (24) in sequence, and an elastic piece (255) is pre-pressed between the top of the first fixing piece (254) and the pressing block (252).

8. The self-heating gate valve according to claim 7, characterized in that: The first positioning hole (24) and the second positioning hole (253) are threaded holes, the first fixing member (254) is a screw, the elastic member (255) is a disc spring, and the disc spring is pre-pressed between the pressing block (252) and the nut or the nut on the top of the screw.

9. The self-heating gate valve according to claim 1, characterized in that: The self-heating gate valve comprises a driving part, which comprises: a mounting seat (5) connected to the valve cover (2) via a column (51), the column (51) supporting the mounting seat (5) at a certain distance from the valve cover (2); and a driving member (61), the other end of the valve stem (4) extending to be drivingly connected to the driving member (61).

10. The self-heating gate valve according to claim 9, characterized in that: The driving part comprises an indication cover (7), the indication cover (7) being arranged along the extension direction of the valve stem (4), and having corresponding valve stem position indication information at different height positions of the indication cover (7).

11. The self-heating gate valve according to claim 9, characterized in that: The mounting seat (5) is provided with a countersunk hole (52), and one end of the upright column (51) is fixed in the countersunk hole (52) of the mounting seat (5).

12. The self-heating gate valve according to claim 9, characterized in that: The driving member (61) is a gear box, the gear box is drivingly connected to the valve stem (4), and the driving part includes a hand wheel (62) drivingly connected to the gear box.

13. The self-heating gate valve according to claim 1, characterized in that: The gate plate (3) has a connecting groove (31) therein, the connecting groove (31) has an annular step therein, the bottom size of the connecting groove (31) is larger than the opening size of the connecting groove (31), and the valve stem (4) is connected to the connecting groove (31) via a connecting piece (32) with a T-shaped cross section.

14. The self-heating gate valve according to claim 13, characterized in that: The bottom of the connecting groove (31) is in the shape of a hexagon.

15. The self-heating gate valve according to claim 1, characterized in that: An elastic groove (33) is provided on the side of the gate plate (3).

16. The self-heating gate valve according to claim 1, characterized in that: The side of the valve body (1) is connected to a flange (13), and the radius of the flange (13) is half of the center height of the valve body (1).

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