Self-cooling gate valve

Abstract

The invention provides a self-heat-dissipation gate valve. The self-heat-dissipation gate valve comprises a valve body, a valve cover, a gate plate and a valve rod. The valve body comprises a channel and a valve seat located on the channel. The valve cover is fixedly connected to the valve body, and a plurality of cooling fins are arranged on the outer side wall of the valve cover at intervals. The flashboard is located in an inner cavity of the valve body, one end of the valve rod is connected with the flashboard, the other end of the valve rod extends upwards to partially extend out of the valve deck, and the flashboard is suitable for being driven by the valve rod to move to be matched with the valve seat to block the channel or driven by the valve rod to move in the direction away from the valve seat to conduct the channel. In the using process, a high-temperature medium in the valve body channel can transfer heat to the valve body and the valve cover, the multiple cooling fins arranged on the valve cover can diffuse the heat to the surrounding environment, and the situation that the temperature of the gate valve is too high, and the working performance of the gate valve is affected is prevented.

Description

Technical Field

[0001] The invention relates to the technical field of mechanical engineering, and in particular to a self-heating gate valve. Background Art

[0002] 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.

[0003] In the prior art, a forged steel gate valve comprises at least a valve body, a valve stem and a gate plate. The gate plate blocks or opens the passage in the valve body under the drive of the valve stem, thereby controlling the flow of the medium. However, the existing forged steel gate valve has poor heat dissipation and cannot be fully applied to high-temperature medium pipelines. High-temperature medium has a great influence on the working performance of the forged steel gate valve. Summary of the invention

[0004] Therefore, the technical problem to be solved by the present invention is to overcome the defects of the forged steel gate valve in the prior art that the heat dissipation is poor, it cannot be fully applied to high-temperature medium pipelines, and the high-temperature medium has a great influence on the working performance of the forged steel gate valve, thereby providing a self-heating gate valve.

[0005] In order to solve the above problems, the present invention 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 sinks are arranged at intervals on the outer side wall of the valve cover; a gate plate and a valve stem, 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 extend out of 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, moving in a direction away from the valve seat to open the channel.

[0006] 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.

[0007] 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, and the heat sink is annular, and the areas of the upper and lower end surfaces are different.

[0008] Optionally, the groove is a strip 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 faces are different.

[0009] 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 press, and the packing press is suitable for pressing the packing in the packing groove.

[0010] 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.

[0011] 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.

[0012] 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 pressing block and a nut or a nut on the top of the screw.

[0013] Optionally, the gate valve includes a driving part, which includes: a mounting seat connected to the valve cover via a column, and the column supports the mounting seat at a certain distance from the valve cover; and a driving member, the other end of the valve stem extends to be transmission-connected to the driving member.

[0014] Optionally, the driving part comprises 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.

[0015] 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.

[0016] Optionally, the driving member is a gear box, the gear box is transmission-connected to the valve stem, and the driving part includes a hand wheel transmission-connected to the gear box.

[0017] Optionally, the gate plate has a connecting groove therein, the connecting groove has an annular step therein, 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 via a connecting piece with a T-shaped cross-section.

[0018] Optionally, the bottom of the connecting groove is in a hexagonal shape.

[0019] Optionally, an elastic groove is provided on the side of the gate plate.

[0020] Optionally, a flange is connected to the side of the valve body, and a radius of the flange is half of the center height of the valve body.

[0021] The present invention has the following advantages:

[0022] The self-heat dissipating gate valve provided by the present invention comprises: a valve body, a valve cover, a gate plate and a valve stem. The valve body comprises 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 extend out of the valve cover, and 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, and the plurality of heat sinks arranged on the valve cover can diffuse the heat into the surrounding environment to prevent the gate valve from overheating and affecting the working performance of the gate valve. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] In order to more clearly illustrate the specific implementation methods of the present invention or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0024] Figure 1 is a schematic structural diagram of a gate valve in an embodiment of the present invention;

[0025] Figure 2 is a partial cross-sectional view of a valve cover in an embodiment of the present invention;

[0026] Figure 3 yes Figure 1 The enlarged view of point A in the middle;

[0027] Figure 4 yes Figure 1 A top view of the top of the middle valve cover;

[0028] Figure 5 yes Figure 1 A top view of the top of the middle mounting seat;

[0029] Figure 6 yes Figure 1 The enlarged view of point B in the middle;

[0030] Figure 7 It is a schematic diagram of the structure of the gate;

[0031] Figure 8 It is a top view of the gate;

[0032] Fig. 9It is a schematic diagram of the structure of the elastic groove on the side of the gate;

[0033] Fig.10 It is a schematic diagram of the height dimensions of the flange and the valve body center;

[0034] Fig.11 It is a schematic diagram of the flange and valve body thickness dimensions.

[0035] Description of reference numerals:

[0036] 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. Press 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

[0037] The technical solution of the present invention will be described clearly and completely below in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0038] In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", and "third" are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance.

[0039] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0040] In addition, the technical features involved in the different embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.

[0041] refer to Figure 1 and Figure 2 In one embodiment of the present invention, the self-heat dissipating gate valve provided by the present invention comprises: a valve body 1, a valve cover 2, a gate plate 3 and a valve stem 4. The valve body 1 comprises 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 dissipating 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, 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.

[0042] 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 550°C and above. A groove can be provided on the top of the valve body 1, and a ridge is provided at the corresponding position of the bottom of the valve cover 2. When installed, 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, and the annular ridge is pressed on 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 out of the valve cavity, it cooperates with the valve seat 12 to block the channel 11. After the gate plate 3 retracts to the valve cavity, it leaves the valve seat 12 to conduct the channel 11. The gate valve provided by the present invention 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.

[0043] There are two valve seats 12 which are arranged opposite to each other in the channel 11. The gate plate 3 is a column with a wedge-shaped cross section, which can contact and cooperate with the two valve seats 12 to block the channel 11 and prevent the flow of the medium. The heat sink 21 can be integrally formed with the valve cover 2. For example, a plurality of 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, which is conducive to heat dissipation.

[0044] 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 arranged on the valve cover 2 can diffuse the heat to the surrounding environment to prevent the gate valve from overheating and affecting its working performance.

[0045] refer to Figure 1 and Figure 2In one embodiment of the present invention, the outer side wall of the valve cover 2 has a plurality of grooves 22 arranged at intervals, and the depths of the plurality of grooves 22 are different, and a heat sink 21 is formed between two adjacent grooves 22. For example, the plurality of grooves 22 are arranged in parallel and at intervals, so that a plurality of parallel heat sinks 21 can be formed, and the depths of adjacent grooves 22 are different, so that the heat dissipation areas at both ends of the heat sink 21 can be different, thereby enhancing the heat dissipation effect. The outer side wall of the valve cover 2 forms a plurality of heat sinks 21 by processing a plurality of grooves 22, thereby reducing the processing difficulty and cost.

[0046] refer to Figure 1 and Figure 2 In a specific embodiment of the present invention, the groove 22 is a through groove extending along the circumferential direction of the outer wall of the valve cover 2. A plurality of 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. For example, four grooves 22 can be processed on the outer wall of the valve cover 2. The depth of the grooves 22 increases from top to bottom, or from shallow to deep to shallow, as long as the depths of two adjacent grooves 22 are different. The heat dissipation areas of the opposite ends of the heat sink 21 formed thereby are different, thereby increasing the heat dissipation effect.

[0047] In another specific embodiment of the present invention, the groove is a strip groove extending in the height direction, and a plurality of 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. For example, a plurality of grooves surround the outer wall of the valve cover along the circumference of the valve cover, and a plurality of heat sinks are formed that also surround the outer wall of the valve cover along the circumference of the valve cover, and the heat dissipation areas of the heat sinks at the two opposite ends are different, thereby increasing the heat dissipation effect.

[0048] refer to Figure 1 and Figure 3 In one embodiment of the present invention, 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 part is arranged on the axial hole 41, and 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. The packing part can ensure the sealing performance of the valve cover 2.

[0049] refer to Figure 1 and Figure 3 In one embodiment of the present invention, the packing includes an upper packing 231 and a lower packing 232, the packing portion includes a spacer ring 233 located between the upper packing 231 and the lower packing 232, the lower packing 232 is a high temperature resistant material packing, and the upper packing 231 is a graphite packing. Since the medium temperature may be higher than 550°C, the lower packing is added with a high temperature resistant packing to withstand the high temperature of the gate, and the heat sink 21 of the valve cover 2 can reduce the temperature of the valve cover 2, and the upper packing 231 can be added with a graphite packing, which is at a normal working temperature, can ensure sealing, and will not be ablated.

[0050] refer to Figure 1 and Figure 3 In one embodiment of the present invention, a first positioning hole 24 is provided on the valve cover 2, and the packing pressing piece includes: a sleeve 251, a pressing block 252, and a first fixing piece 254. The sleeve 251 is sleeved on the valve stem 4 and presses the packing. The pressing block 252 is sleeved on the valve stem 4, and the bottom is in contact with the top of the sleeve 251, and a second positioning hole 253 is provided on the pressing block 252. The first fixing piece 254 passes 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.

[0051] Specifically, the sleeve 251 is cylindrical and has a flange on the top, the pressing block 252 has a circular hole in the middle, the valve stem 4 passes through the circular hole, and the bottom of the pressing block 252 abuts against the top of the sleeve 251. Figure 4 As shown, the edge of the pressing block is provided with two second positioning holes 253, and the corresponding top of the valve cover 2 has two first positioning holes 24. The two first fixing members 254 can pass through the corresponding second positioning holes 253 and the first positioning holes 24 to press the pressing block 252 onto the shaft sleeve 251, so that the shaft sleeve 251 can be pressed onto 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 pressing block 252. When the packing is damaged, the elastic force of the elastic member 255 can continue to provide pressure to the pressing block 252, so that the pressing block 252 and the shaft sleeve 251 are pressed toward the packing to ensure the sealing.

[0052] refer to Figure 3 In a specific embodiment of the present invention, 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, which is pre-pressed between the pressing block 252 and the nut or nut on the top of the screw. The screw can pass through the two threaded holes in sequence, and then the disc spring is used to transfer the pressure to the pressing block 252. The screw can have a nut, or a nut threadedly matched at the top of the screw, which can play the role of providing pressure to the disc spring.

[0053] refer to Figure 1 In one embodiment of the present invention, the gate valve includes a driving unit, which includes: a mounting seat 5 and a driving member 61. The mounting seat 5 is connected to the valve cover 2 through a column 51, and the column 51 supports the mounting seat 5 at a certain distance from the valve cover 2. The other end of the valve stem 4 extends to be in transmission connection with the driving member 61.

[0054] For example Figure 1 and Figure 5As shown, the mounting seat 5 is mounted on the valve cover 2 through four columns 51, thereby preventing the heat of the valve cover 2 from being transferred to the mounting seat 5, and at the same time exposing the top of the valve cover 2 to increase the heat dissipation area of ​​the valve cover 2. After the valve stem 4 extends from the valve cavity, it extends to connect with the driving member, and the driving member 61 can drive the valve stem 4 to move toward or away from the valve cavity.

[0055] refer to Figure 1 and Figure 5 In one embodiment of the present invention, a countersunk hole 52 is provided on the mounting seat 5, and one end of the column 51 is fixed in the countersunk hole 52 of the mounting seat 5. Figure 5 The mounting seat 5 can be a connecting flange, and four countersunk holes 52 are arranged on the connecting flange. One end of the column 51 is fixed in the countersunk hole 52 by a nut, so that the thickness of the connecting flange can be reduced, making the overall structure more compact.

[0056] refer to Figure 1 and Figure 5 In one embodiment of the present invention, the driving member 61 is a gear box, which is in driving connection with the valve stem 4, and the driving part includes a hand wheel 62 in driving connection with the gear box. When the valve is opened and closed, the hand wheel 62 can be used to drive the gear of the gear box to rotate, so as to drive the valve stem 4 to move toward or away from the valve cavity. Of course, the hand wheel can also be replaced by a motor.

[0057] refer to Figure 1 and Figure 5 , the mounting seat 5 is provided with a third positioning hole 53, and the driving member 61 is fixed to the mounting seat 5 through the second fixing member 54. For example, four third positioning holes 53 may be evenly arranged along the circumference of the mounting seat 5, and the four second fixing members 54 respectively pass through the corresponding third positioning holes 53 to fix the driving member 61 to the mounting seat 5. The third positioning hole 53 may be a threaded hole, and the second fixing member 54 may be a screw.

[0058] refer to Figure 1 In one embodiment of the present invention, the driving unit includes an indicator cover 7, which is arranged along the extension direction of the valve stem 4, and has corresponding valve stem 4 position indication information at different height positions of the indicator cover 7. For example, the indicator cover 7 is provided with indication marks for the valve opening and closing positions, and when the top of the valve stem 4 reaches different indication marks, the current valve opening and closing status can be determined.

[0059] refer to Figure 6 , Figure 7 and Figure 8In one embodiment of the present invention, the gate plate 3 has a connecting groove 31, the connecting groove 31 has an annular step, the bottom size of the connecting groove 31 is larger than the opening size of the connecting groove 31, and the valve stem is connected to the connecting groove 31 through a connecting piece 32 with a T-shaped cross section. The smaller end of the connecting piece 32 can be connected to the valve stem 4 by welding, and 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 to prevent the gate plate 3 from separating from the connecting piece 32, thereby improving the stability of the connection.

[0060] refer to Figure 6 , Figure 7 and Figure 8 In one embodiment of the present invention, the bottom of the connection groove 31 is in a hexagonal shape. Accordingly, the cross section of the larger end of the connection member 32 is also in a hexagonal shape, thereby ensuring that the outer wall of the connection member 32 abuts against the corresponding inner wall of the connection groove 31. The hexagonal shape ensures that the connection member 32 provides a stable and uniform pressure to the gate plate 3, and also prevents the gate plate 3 from rotating in the horizontal direction relative to the connection member 32.

[0061] refer to Figure 6 and Fig. 9 In one embodiment of the present invention, an elastic groove 33 is provided on the side of the gate plate 3. For example, the gate plate 3 is a column and can be processed from a bar. The elastic groove 33 is on the side of the gate plate 3 and is a 360-degree annular elastic groove, which can ensure that the gate plate 3 can be properly deformed under the action of an external force, and prevent the gate plate 3 from being stuck by the valve seat 12 under high temperature.

[0062] refer to Fig.10 and Fig.11 In one embodiment of the present invention, the side of the valve body 1 is connected with a flange 13, and the radius of the flange 13 is half of the center height of the valve body 1. For example, half of the center height of the valve body 1 is H2, half of 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. The equal flange encompassing the outer contour of the valve body design can effectively reduce the amount of valve body blanks, and the size of the flange can be determined according to the user's choice.

[0063] Obviously, the above embodiments are merely examples for the purpose of clear explanation, and are not intended to limit the implementation methods. For those skilled in the art, other different forms of changes or modifications can be made based on the above description. It is not necessary and impossible to list all the implementation methods here. The obvious changes or modifications derived therefrom are still within the scope of protection of the invention.

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 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 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 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 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 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 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 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 gate valve according to claim 1, characterized in that: The 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 transmission-connected to the driving member (61).

10. The 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 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 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 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 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 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 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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