Wedge gate valve

Abstract

The utility model relates to a wedge gate valve which comprises a valve body, a valve seat, a gate plate, a valve cover, a valve rod and a power source, the valve cover is fixedly arranged on the valve body, the valve seat is arranged in the valve body, the upper end of the valve rod is connected with the power source, and the lower end of the valve rod is matched with the gate plate so as to drive the gate plate to axially slide relative to the valve seat. The valve body is provided with a flow channel and a containing cavity located above the flow channel, an opening is formed in the lower end of the containing cavity to communicate with the flow channel, the valve seats are welded to the positions, located on the two sides of the opening, in the flow channel, the valve seats are obliquely arranged, the lower end of the valve rod extends into the gate plate and is in threaded fit with the gate plate, and when the valve rod rotates under the action of the driving part, the valve rod is in threaded fit with the gate plate. The flashboard slides relative to the valve rod. By means of the technical scheme, the wedge gate valve is provided, the gate plate and the valve seat are in contact through the elastic sealing piece, the sealing performance between the gate plate and the valve seat is not affected, abrasion between the gate plate and the valve seat can be effectively avoided, the valve rod only rotates and does not move, and the space of the gate valve is reduced.

Description

Technical Field

[0001] This utility model relates to the field of valve technology, and in particular to a wedge gate valve. Background Technology

[0002] Wedge gate valves are opening and closing devices used in petrochemical, thermal power plant and other fields. They are mainly used to connect or cut off the medium in oil and steam pipelines.

[0003] A gate valve is an opening and closing component. The gate moves vertically along its center; upward movement opens the valve, and downward movement closes it. Currently, in most flat gate valves, the sealing surfaces of the valve seat and the gate are always in contact during the opening and closing process. This means that each time the valve is opened and closed, the sealing surfaces of the valve seat and the gate are constantly rubbing against each other, resulting in a large opening and closing torque and accelerating the wear of the valve seat and the gate, leading to a shorter service life. Furthermore, in existing technologies, the valve stem is driven up and down by a handwheel or electric drive to move the gate. This requires space for both the gate and the valve stem to move, which complicates the overall structure of the gate valve. Utility Model Content

[0004] The purpose of this utility model is to overcome the defects of the prior art. This utility model provides a wedge gate valve in which the gate and the valve seat are in contact through an elastic sealing element, which does not affect the sealing performance between the two and can effectively avoid wear between them. In addition, the valve stem only rotates and does not move, reducing the space of the gate valve.

[0005] The technical solution of this utility model is as follows: A wedge gate valve includes a valve body, a valve seat, a gate, a valve cover, a valve stem, and a power source. The valve cover is fixedly mounted on the valve body, and the valve seat is located within the valve body. The upper end of the valve stem extends through the valve cover and is directly or indirectly connected to the power source. The lower end of the valve stem engages with the gate to drive the gate to slide axially relative to the valve seat. The valve body has a flow channel and a receiving cavity located above the flow channel. The lower end of the receiving cavity has an opening to guide the flow channel. The valve seats are welded to both sides of the opening within the flow channel. The valve seats are inclined. The lower end of the valve stem extends into the gate and is threaded into the gate. When the valve stem rotates under the action of the drive component, the gate slides relative to the valve stem, sliding into the flow channel from the opening or rising into the receiving cavity to realize the opening and closing of the flow channel. The outer wall of the gate is provided with a first elastic seal and the valve seat is provided with a second elastic seal. When the gate is located in the flow channel, the first elastic seal and the second elastic seal are in contact. The valve cover is provided with a distance sensor for detecting the sliding distance of the gate. The valve body is provided with a positioning structure for positioning the gate after it slides.

[0006] Using the above technical solution, the valve seat is fixed to both sides of the flow channel opening by inclined welding. This ensures the connection strength between the valve seat and the valve body, preventing valve seat displacement and deformation under medium pressure. It also forms a precise sealing surface with the wedge gate. Combined with the double elastic contact seal of the first elastic seal on the outside of the gate and the second elastic seal on the valve seat, compared to traditional hard seal structures, the sealing surface fits more tightly, effectively compensating for minor machining errors and deformation under operating conditions, significantly reducing the risk of leakage. Simultaneously, the water grooves on both sides of the gate can, on the one hand, remove medium impurities adhering to the sealing surface during opening and closing, reducing seal wear and extending seal life; on the other hand, they can reduce the lateral pressure of the medium on the gate. This design avoids damage to the sealing surface caused by impurity accumulation, further improving sealing reliability. It is suitable for media conveying scenarios containing a small amount of suspended impurities. The valve stem and gate are driven by a threaded connection. When the valve stem rotates, it drives the gate to slide precisely along the axial direction. Compared with the direct drive structure of the valve stem, the transmission accuracy is higher, avoiding jamming caused by gate force deviation. The gate can smoothly slide into the flow channel from the accommodating cavity through the opening or rise to reset. There is no jamming during the opening and closing process. Moreover, the design of the accommodating cavity provides ample storage space for the gate, avoiding the gate from causing additional obstruction to the flow of media and reducing flow resistance loss. This transmission method also reduces the direct friction between the valve stem and the gate, reduces component wear, and extends the overall service life of the valve.

[0007] A further feature of this invention is that the distance sensor is provided on the upper top wall of the valve cover, and the distance sensor is located directly above the gate.

[0008] The above-mentioned further settings are used to monitor the displacement of the gate, avoiding the errors caused by the traditional indirect conversion through valve stem displacement, improving the accuracy and reliability of gate valve opening detection, and keeping it away from the main channel scouring area, so it is less affected by media erosion and impurity interference. At the same time, the valve cover structure can form effective protection, improving the working stability of the sensor under high temperature, high pressure, and particulate media conditions.

[0009] A further feature of this invention is as follows: the positioning structure includes a positioning plate and a return spring. The valve body has first mounting chambers on both sides of the opening. The positioning plate and the return spring are located in the first mounting chambers. The two ends of the return spring abut against the inner wall of the first mounting chamber and the positioning plate, respectively. The positioning plate slides relative to the first mounting chamber. The outer circumferential surfaces of the upper and lower ends of the gate plate are provided with arc-shaped positioning grooves. The end of the positioning plate is arc-shaped and is positioned and cooperates with the positioning grooves.

[0010] By further configuring the above-mentioned features, first mounting chambers are set on both sides of the valve body opening, and positioning plates and return springs are arranged in the first mounting chambers. The elastic pushing action of the return spring on the positioning plate makes the positioning plate and the arc positioning groove on the outer circumference of the gate form an elastic positioning fit, realizing the precise positioning and self-locking of the gate in the fully open or fully closed position. This prevents the gate from moving, shifting, or opening and closing on its own under the impact of the medium and vibration, improving the stability and positional reliability of the valve operation. The end of the positioning plate and the positioning groove both adopt an arc surface structure, and the arc surfaces form a guiding and fitting fit, which can not only ensure accurate positioning and smooth contact, but also reduce frictional resistance during the opening and closing of the gate, making the gate move smoothly, reducing the risk of jamming, and reducing wear on the positioning parts, extending the service life. The positioning plate can slide relative to the mounting chamber, and the structure is simple and compact. The elastic force of the return spring can adaptively compensate for machining errors and assembly gaps, ensuring reliable positioning and flexible operation, without affecting the overall sealing performance and structural strength of the valve, and is suitable for use in complex working conditions such as high temperature, high pressure, and vibration.

[0011] A further feature of this invention is that the gate is provided with an installation groove, and a nut is provided in the installation groove. The valve stem is threadedly engaged with the nut. When the valve stem rotates, the nut moves relative to the valve stem, causing the gate to move within the flow channel and the receiving cavity.

[0012] With the above-mentioned further configuration, the valve stem and the gate are driven by a threaded connection. The power is transmitted through the nut fixed by the mounting groove inside the gate. When the valve stem rotates, it drives the nut and the gate to slide precisely along the axial direction. Compared with the valve stem direct drive structure, the transmission accuracy is higher and the jamming problem caused by the gate being deviated by force is avoided.

[0013] A further feature of this invention is that the upper end of the gate is provided with an upper buffer member, and the lower end of the gate is provided with a lower buffer member. When the gate moves down into the flow channel, the lower buffer member contacts the bottom wall of the valve body. When the gate rises into the accommodating cavity, the upper buffer member contacts the top wall of the accommodating cavity.

[0014] With the above-mentioned further design, upper and lower buffer components are respectively installed at the upper and lower ends of the gate to form a two-way buffer protection. When the gate moves down to the flow channel, the lower buffer component contacts the bottom wall of the valve body, effectively absorbing the closing impact force and avoiding damage to the gate, valve body, and seals due to hard contact. When the gate rises to the accommodating cavity to reset, the upper buffer component contacts the top wall of the accommodating cavity, buffering the upward inertial force and preventing the gate from colliding and deforming with the valve cover. This design not only improves the smoothness of opening and closing operations, but also protects the integrity of the seals and valve body structure, reduces the impact of operating vibration on the valve, and is suitable for working scenarios with frequent opening and closing.

[0015] A further improvement of this utility model: the valve cover is bolted to the top of the valve body. The valve cover includes an integrally formed vertical part and a cover part. The cover part is arranged in an inverted bowl shape. The vertical part of the valve cover is provided with a fixed seat, a first packing and a first packing sleeve from bottom to top. The fixed seat is interference-fitted with the inner wall of the valve cover. The first packing sleeve presses the first packing onto the fixed seat. The outer edge of the upper end of the first packing sleeve abuts against the upper end face of the valve cover. The upper end of the valve stem passes through the fixed seat, the first packing and the first packing sleeve in sequence.

[0016] Further configuration: It also includes a bracket, which is fixedly installed above the valve cover. The upper end of the bracket is provided with a second mounting chamber. The second mounting chamber is provided with a second packing, a second packing sleeve, and a second packing pressure plate in sequence from bottom to top. The second packing pressure plate is provided with an annular baffle, which is pressed against the upper end face of the bracket. The second packing pressure plate is interference-fitted with the inner wall of the bracket. The upper end of the valve stem passes through the second packing, the second packing sleeve, and the second packing pressure plate in sequence and extends to the outside of the bracket to connect with the power source. The valve stem is also provided with a first packing pressure plate above the first packing sleeve. The first packing pressure plate is interference-fitted with the inner wall of the bracket.

[0017] With the above-mentioned further design, the valve cover can be detached and installed via bolts, facilitating later maintenance and repair. The one-piece molded vertical part and the inverted cup-shaped cover part enhance the structural rigidity of the valve cover, preventing deformation under high-pressure conditions. The fixing seat, first packing, first packing sleeve, and first packing pressure plate inside the vertical part of the valve cover form a multi-layer packing seal structure. The interference fit installation method ensures that the packing is fully compacted, effectively blocking the leakage of the medium from the gap between the valve stem and the valve cover. On this basis, the second packing, second packing sleeve, and second packing pressure plate above the bracket form a secondary sealing protection. The superposition of the double packing seal structure can adapt to high-pressure and corrosive media transportation scenarios, significantly improving the valve's leakage prevention level. The cooperation between the annular baffle and the bracket further fixes the position of the packing pressure plate, preventing the packing from loosening due to operating vibration and ensuring long-term stable sealing performance.

[0018] A further improvement of this invention is that the power source is a handwheel, located above the bracket, with the upper end of the valve stem passing through the bracket and connected to the power source.

[0019] With the above-mentioned further design, the power source adopts a handwheel design, which is simple and reliable in structure, low in maintenance cost, and suitable for small and medium diameter valves and manual control requirements. The handwheel is connected to the valve stem through a bracket, which provides stable support for the power source and provides an installation carrier for the secondary packing seal structure. The overall layout is compact and easy to operate, and can realize precise control of the gate opening and closing, meeting the needs of industrial scenarios with certain requirements for operational precision. Attached Figure Description

[0020] Figure 1 These are practical drawings illustrating specific embodiments of this utility model;

[0021] Figure 2 This is a schematic diagram of the valve body in a specific embodiment of the present utility model;

[0022] Figure 3 This is a schematic diagram of the gate plate according to a specific embodiment of the present utility model;

[0023] Figure 4 for Figure 1 Enlarged view of section A;

[0024] Figure 5 for Figure 1 Enlarged view of section B.

[0025] In the diagram, 1. Valve body; 11. Flow channel; 12. Receiving cavity; 13. First mounting chamber; 2. Valve seat; 21. Second elastic seal; 3. Gate; 31. First elastic seal; 32. Mounting groove; 33. Upper buffer; 34. Lower buffer; 35. Positioning groove; 4. Valve cover; 41. Vertical part; 411. Fixed seat; 412. First packing; 413. First packing sleeve; 414. First packing pressure plate; 42. Covering part; 43. Distance sensor; 5. Valve stem; 6. Power source; 7. Nut; 8. Bolt; 9. Bracket; 91. Second mounting chamber; 92. Second packing; 93. Second packing pressure rod; 94. Second packing pressure plate; 95. Annular baffle; 10. Positioning structure; 101. Positioning plate; 102. Return spring. Detailed Implementation

[0026] The technical solutions in this embodiment will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, and not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0027] It should be noted that all directional indicators (such as up, down, forward, backward, etc.) in the description of this utility model are only used to explain the relative positional relationship and movement of the components in a certain specific posture (as shown in the figure). If the specific posture changes, the directional indicator will also change accordingly.

[0028] Furthermore, in this utility model, the use of terms such as "first," "second," etc., is for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. In the description of this utility model, "a number" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0029] Furthermore, the technical solutions of the various embodiments of this utility model can be combined with each other, but this must be based on the ability of those skilled in the art to implement them. When the combination of technical solutions is contradictory or cannot be implemented, it should be considered that such combination of technical solutions does not exist and is not within the scope of protection claimed by this utility model.

[0030] like Figure 1-5As shown, a wedge gate valve includes a valve body 1, a valve seat 2, a gate 3, a valve cover 4, a valve stem 5, and a power source 6. The valve cover 4 is fixedly mounted on the valve body 1, and the valve seat 2 is disposed inside the valve body 1. The upper end of the valve stem 5 extends through the valve cover 4 and is directly or indirectly connected to the power source 6. The lower end of the valve stem 5 cooperates with the gate 3 to drive the gate 3 to slide axially relative to the valve seat 2. The valve body 1 is provided with a flow channel 11 and a receiving cavity 12 located above the flow channel 11. The lower end of the receiving cavity 12 has an opening to guide the flow channel 11. The valve seat 2 is welded to both sides of the opening in the flow channel 11. The valve seat 2 is inclined. The lower end of the valve stem 5 extends into the gate 3 and is threadedly engaged with the gate 3. The valve stem 5 is driven by... When rotated under the action of the valve stem 5, the gate 3 slides relative to the valve stem 5, sliding from the opening into the flow channel 11 or rising into the receiving cavity 12 to realize the opening and closing of the flow channel 11. The outer wall of the gate 3 is provided with a first elastic seal 31, and the valve seat 2 is provided with a second elastic seal 21. When the gate 3 is located in the flow channel 11, the first elastic seal 31 and the second elastic seal 21 are in contact. The valve cover 4 is provided with a distance sensor 43 for detecting the sliding distance of the gate. The valve body 1 is provided with a buzzer. After the distance sensor detects that the gate has moved into place, the buzzer works to remind the operator. The valve body 1 is provided with a positioning structure 10 for positioning the gate 3 after it slides. The valve seat 2 is made of inclined welding. Fixed on both sides of the opening of the flow channel 11, it ensures the connection strength between the valve seat 2 and the valve body 1, preventing displacement and deformation of the valve seat 2 under the action of medium pressure. It also forms a precise sealing surface with the wedge gate 3. Combined with the double elastic contact seal of the first elastic seal 31 on the outside of the gate 3 and the second elastic seal 21 on the valve seat 2, compared with the traditional hard seal structure, the sealing surface fits more tightly, which can effectively compensate for slight processing errors and deformation under working conditions, and significantly reduce the risk of leakage. At the same time, the water grooves on the left and right sides of the gate 3 can, on the one hand, remove the medium impurities attached to the sealing surface during opening and closing, reduce the wear of the seals, and extend the seal life; on the other hand, it can reduce the lateral pressure of the medium on the gate 3, and avoid the accumulation of impurities. Damage to the sealing surface further improves sealing reliability, making it suitable for media conveying scenarios containing a small amount of suspended impurities. The valve stem 5 and the gate 3 adopt a threaded connection for transmission. When the valve stem 5 rotates, it drives the gate 3 to slide precisely along the axial direction. Compared with the direct drive structure of the valve stem 5, the transmission accuracy is higher, avoiding the jamming problem caused by the force deviation of the gate 3. The gate 3 can smoothly slide into the flow channel 11 from the accommodating cavity 12 through the opening or rise to reset. There is no jamming during the opening and closing process. Moreover, the design of the accommodating cavity 12 provides sufficient storage space for the gate 3, avoiding the gate 3 from causing additional obstruction to the flow of media and reducing flow resistance loss. This transmission method also reduces the direct friction between the valve stem 5 and the gate 3, reduces component wear, and extends the overall service life of the valve.

[0031] The distance sensor 43 is provided on the upper top wall of the valve cover 4. The distance sensor 43 is located directly above the gate plate 3 and is used to monitor the displacement of the gate plate. This avoids the error caused by the traditional indirect calculation through valve stem displacement, improves the accuracy and reliability of gate valve opening detection, and is far away from the main channel scouring area. It is less affected by media erosion and impurity interference. At the same time, it can form effective protection through the valve cover structure, improving the working stability of the sensor under high temperature, high pressure and particulate media conditions.

[0032] The positioning structure 10 includes a positioning plate 101 and a return spring 102. The valve body 1 has first mounting chambers 13 located on both sides of the opening. The positioning plate 101 and the return spring 102 are disposed within the first mounting chambers 13, with the two ends of the return spring 102 respectively contacting the inner wall of the first mounting chamber 13 and the positioning plate 101. The positioning plate 101 slides relative to the first mounting chamber 13. The outer circumferential surfaces of the upper and lower ends of the gate plate 3 are provided with arc-shaped positioning grooves 35. The end of the positioning plate 101 is arc-shaped and positions itself in conjunction with the positioning grooves 35. By providing mounting chambers on both sides of the valve body opening and arranging the positioning plate and return spring within these chambers, the elastic pushing action of the return spring on the positioning plate causes the positioning plate and the arc-shaped positioning grooves on the outer circumference of the gate plate to form a spring-loaded connection. The precise positioning and self-locking mechanism ensures accurate positioning of the gate in both fully open and fully closed positions, preventing it from shifting, deviating, or opening / closing on its own under conditions of media impact and vibration. This improves the valve's operational stability and positional reliability. Both the end of the positioning plate and the positioning groove feature a circular arc surface structure, creating a guiding and close fit. This ensures accurate positioning and smooth contact, while also reducing frictional resistance during gate opening and closing, resulting in smooth gate movement, reduced jamming risk, and decreased wear on the positioning parts, extending service life. The positioning plate can slide relative to the mounting chamber, resulting in a simple and compact structure. The return spring's elastic force can adaptively compensate for machining errors and assembly gaps, ensuring reliable positioning and flexible operation without affecting the valve's overall sealing performance and structural strength. It is suitable for use in complex conditions such as high temperature, high pressure, and vibration.

[0033] The gate 3 has a mounting groove 32, and a nut 7 is provided in the mounting groove 32. The valve stem 5 is threadedly engaged with the nut 7. When the valve stem 5 rotates, the nut 7 moves relative to the valve stem 5, causing the gate 3 to move within the flow channel 11 and the accommodating cavity 12. The valve stem 5 and the gate 3 are driven by a threaded engagement. Power transmission is achieved through the nut 7 fixed by the mounting groove 32 in the gate 3. When the valve stem 5 rotates, it drives the nut 7 and the gate 3 to slide precisely along the axial direction. Compared with the direct drive structure of the valve stem 5, the transmission accuracy is higher, avoiding the jamming problem caused by the force deviation of the gate 3.

[0034] The upper end of the gate 3 is provided with an upper buffer 33, and the lower end of the gate 3 is provided with a lower buffer 34. The upper and lower buffers 34 can be set with sealing gaskets. When the gate 3 moves down into the flow channel 11, the lower buffer 34 contacts the bottom wall of the valve body 1. When the gate 3 rises into the receiving cavity 12, the upper buffer 33 contacts the top wall of the receiving cavity 12. The upper buffer 33 and lower buffer 34 respectively provided at the upper and lower ends of the gate 3 form a bidirectional buffer protection. When the gate 3 moves down into the flow channel 11, the lower buffer... The punch 34 contacts the inner bottom wall of the valve body 1, effectively absorbing the closing impact force and preventing damage to the gate 3, valve body 1, and seals due to hard contact. When the gate 3 rises to the reset position of the accommodating cavity 12, the upper buffer 33 contacts the top wall of the accommodating cavity 12, buffering the rising inertial force and preventing the gate 3 from colliding and deforming with the valve cover 4. This design not only improves the smoothness of opening and closing operations but also protects the seals and the structural integrity of the valve body 1, reduces the impact of operating vibrations on the valve, and is suitable for frequent opening and closing scenarios.

[0035] The valve cover 4 is installed on top of the valve body 1 by bolts 8. The valve cover 4 includes an integrally formed vertical part 41 and a cover part 42. The cover part 42 is arranged in an inverted bowl shape. The vertical part 41 of the valve cover 4 is provided with a fixing seat 411, a first packing 412 and a first packing 412 pressure sleeve from bottom to top. The fixing seat 411 is interference-fitted with the inner wall of the valve cover 4. The first packing 412 pressure sleeve presses the first packing 412 onto the fixing seat 411. The outer edge of the upper end of the first packing 412 pressure sleeve abuts against the upper end face of the valve cover 4. The upper end of the valve stem 5 passes through the valve cover 4. The valve includes a fixed seat 411, a first packing 412, and a first packing 412 pressure sleeve; it also includes a bracket 9, which is fixedly installed above the valve cover 4. A first packing 412 pressure plate is also provided above the first packing 412 pressure sleeve outside the valve stem 5. The first packing 412 pressure plate is interference-fitted with the inner wall of the bracket 9. A second mounting chamber 91 is provided at the upper end of the bracket 9. Inside the second mounting chamber 91, a second packing 92, a second packing 92 pressure sleeve, and a second packing 92 pressure plate are arranged sequentially from bottom to top. An annular baffle 95 is provided on the second packing 92 pressure plate. The baffle 95 is pressed onto the upper end face of the bracket 9. The second packing 92 pressure plate is press-fitted with the inner wall of the bracket 9. The upper end of the valve stem 5 passes through the second packing 92, the second packing 92 pressure sleeve, and the second packing 92 pressure plate in sequence, extending to the outside of the bracket 9 and connecting with the power source 6. The valve cover 4 is detachable and installable by bolts 8, which facilitates later maintenance and repair. The integrally formed vertical part 41 and the inverted cup-shaped cover part 42 improve the structural rigidity of the valve cover 4 and prevent deformation under high pressure conditions. The fixing seat 411, the first packing 412, the first packing 412 pressure sleeve, and the first packing are all located inside the vertical part 41 of the valve cover 4. The 412 pressure plate forms a multi-layer packing seal structure. The interference fit installation method ensures that the packing is fully compacted, effectively blocking the leakage of the medium from the gap between the valve stem 5 and the valve cover 4. On this basis, the second packing 92, the second packing 92 pressure sleeve and the second packing 92 pressure plate above the bracket 9 form a secondary sealing protection. The superposition of the double packing seal structure can adapt to high pressure and corrosive media transportation scenarios, greatly improving the leakage prevention level of the valve. The cooperation between the annular baffle 95 and the bracket 9 further fixes the position of the packing pressure plate, avoiding the packing from loosening due to operating vibration, and ensuring long-term stable sealing performance.

[0036] The power source 6 is equipped with a handwheel and is located above the bracket 9. The upper end of the valve stem 5 passes through the bracket 9 and is connected to the power source 6. The power source adopts a handwheel design, which is simple and reliable in structure, low in maintenance cost, and suitable for scenarios with small and medium diameters and manual control requirements. The handwheel is connected to the valve stem 5 through the bracket 9. The bracket 9 provides stable support for the power source 6 and also provides an installation carrier for the secondary packing seal structure. The overall layout is compact and easy to operate, which can realize precise control of the opening and closing of the gate 3 and meet the needs of industrial scenarios with certain requirements for operational precision.

Claims

1. A wedge gate valve, comprising a valve body (1), a valve seat (2), a gate (3), a valve cover (4), a valve stem (5), and a power source (6), wherein the valve cover (4) is fixedly disposed on the valve body (1), the valve seat (2) is disposed inside the valve body (1), the upper end of the valve stem (5) extends through the valve cover (4) and is directly or indirectly connected to the power source (6), and the lower end of the valve stem (5) cooperates with the gate (3) to drive the gate (3) to slide axially relative to the valve seat (2), characterized in that, The valve body (1) is provided with a flow channel (11) and a receiving cavity (12) located above the flow channel (11). The lower end of the receiving cavity (12) is provided with an opening to guide the flow channel (11). The valve seats (2) are welded to both sides of the opening in the flow channel (11). The valve seats (2) are inclined and the distance between the two valve seats (2) decreases from top to bottom. The lower end of the valve stem (5) extends into the gate plate (3) and is threadedly engaged with the gate plate (3). When the valve stem (5) rotates under the action of the driving component, the gate plate (3) slides relative to the valve stem (5) and slides into the flow channel (11) or the upper part of the flow channel (11) from the opening. The gate (3) is raised into the accommodating cavity (12) to realize the opening and closing of the flow channel (11). The outer wall of the gate (3) is provided with a first elastic seal (31), and the valve seat (2) is provided with a second elastic seal (21). When the gate (3) is located in the flow channel (11), the first elastic seal (31) contacts the second elastic seal (21). The valve cover (4) is provided with a distance sensor (43) for detecting the sliding distance of the gate (3). The valve body (1) is provided with a positioning structure (10) for positioning the gate (3) after the gate (3) slides. The valve body (1) is provided with a buzzer.

2. The wedge gate valve of claim 1, wherein, The distance sensor (43) is provided on the upper top wall of the valve cover (4), and the distance sensor (43) is located directly above the gate (3).

3. Wedge gate valve according to claim 1 or 2, characterized in that The positioning structure (10) includes a positioning plate (101) and a return spring (102). The valve body (1) is provided with a first installation chamber (13) on both sides of the opening. The positioning plate (101) and the return spring (102) are located in the first installation chamber (13). The two ends of the return spring (102) abut against the inner wall of the first installation chamber (13) and the positioning plate (101) respectively. The positioning plate (101) slides relative to the first installation chamber (13). The upper and lower outer circumferential surfaces of the gate (3) are provided with a positioning groove (35) in an arc shape. The end of the positioning plate (101) is provided with an arc surface and is positioned and cooperates with the positioning groove (35).

4. Wedge gate valve according to claim 1 or 2, characterized in that The gate (3) is provided with an installation groove (32), and the installation groove (32) is provided with a nut (7). The valve stem (5) is threadedly engaged with the nut (7). When the valve stem (5) rotates, the nut (7) moves relative to the valve stem (5), causing the gate (3) to move within the flow channel (11) and the accommodating cavity (12).

5. The wedge gate valve according to claim 1 or 2, wherein The upper end of the gate (3) is provided with an upper buffer (33), and the lower end of the gate (3) is provided with a lower buffer (34). When the gate (3) moves down into the flow channel (11), the lower buffer (34) contacts the bottom wall of the valve body (1). When the gate (3) rises into the accommodating cavity (12), the upper buffer (33) contacts the top wall of the accommodating cavity (12).

6. The wedge gate valve of claim 1 or 2, wherein, The valve cover (4) is installed on the valve body (1) by bolts (8). The valve cover (4) includes an integrally formed vertical part (41) and a cover part (42). The cover part (42) is set in an inverted bowl shape. The vertical part (41) of the valve cover (4) is provided with a fixed seat (411), a first packing (412) and a first packing (412) pressure sleeve from bottom to top. The fixed seat (411) is interference-fitted with the inner wall of the valve cover (4). The first packing (412) pressure sleeve presses the first packing (412) onto the fixed seat (411). The outer edge of the upper end of the first packing (412) pressure sleeve abuts against the upper end face of the valve cover (4). The upper end of the valve stem (5) passes through the fixed seat (411), the first packing (412) and the first packing (412) pressure sleeve in sequence.

7. The wedge gate valve of claim 6, wherein, It also includes a bracket (9), which is fixedly installed above the valve cover (4). The upper end of the bracket (9) is provided with a second installation chamber (91). The second installation chamber (91) is provided with a second packing (92), a second packing (92) sleeve and a second packing (92) pressure plate from bottom to top. The second packing (92) pressure plate is provided with an annular baffle (95). The annular baffle (95) is pressed on the upper end face of the bracket (9). The second packing (92) pressure plate is interference-fitted with the inner wall of the bracket (9). The upper end of the valve stem (5) passes through the second packing (92), the second packing (92) sleeve and the second packing (92) pressure plate in sequence and extends to the outside of the bracket (9) and connects to the power source (6). The valve stem (5) is also provided with a first packing (412) pressure plate above the first packing (412) sleeve. The first packing (412) pressure plate is interference-fitted with the inner wall of the bracket (9).

8. The wedge gate valve of claim 7, wherein, The power source (6) is equipped with a handwheel and is located above the bracket (9). The upper end of the valve stem (5) passes through the bracket (9) and is connected to the power source (6).

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