A bidirectional sealing wedge gate valve
Patent Information
- Application Number
- CN202522196815.8
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-10-17
- Publication Date
- 2026-09-18
- Estimated Expiration
- 2035-10-17
AI Technical Summary
现有的楔式闸阀存在缺陷，其一、随着介质中杂质沉淀在阀体内腔底部，闸板底部会与杂质提前顶触而造成闸板向下移动不到位，闸板两侧与阀座存在间隙，无法完全关闭，维护周期短；其二、楔式闸阀的闸板与阀座多次摩擦或是在介质冲刷下而造成密封面损坏，此时需要更换整个闸板，如此会造成维护成本高且资源浪费的现象
[0010] The beneficial effects of this utility model are as follows: By disassembling and assembling the sealing plate relative to the wedge, this design reduces usage costs and resource waste compared to existing technologies, thus achieving both environmental protection and economic benefits. The design of the wedge block pushing the top rod, causing the sealing plate to fit tightly against the valve seat under the push of the top rod, ensures an effective hard seal between the gate and the valve seat even when the gate cannot move downwards to its position. This extends the maintenance cycle, reduces maintenance costs, and provides stable sealing. During the opening process, one sealing plate separates from the corresponding valve seat, and the pressure of the other sealing plate on the corresponding valve seat decreases, thereby improving the gate's opening efficiency. The contact block design prevents the sealing plate 22 from contacting impurities at the bottom of the valve body 1, which could affect its movement.
Smart Images
Figure CN224770908U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of gate valve technology, and more specifically to a bidirectional sealing wedge gate valve. Background Technology
[0002] A wedge gate valve is a sliding valve with a wedge-shaped gate as its closing element, where the gate and seat fit tightly together. Wedge gate valves are widely used in pipeline systems for petroleum, chemical, natural gas, and related products. However, existing wedge gate valves have several drawbacks. First, as impurities in the medium settle at the bottom of the valve body, the bottom of the gate may prematurely contact these impurities, preventing the gate from moving downwards completely and creating gaps between the gate and the seat, thus preventing complete closure and resulting in short maintenance cycles. Second, repeated friction between the gate and seat or damage from media erosion can damage the sealing surface, requiring replacement of the entire gate, leading to high maintenance costs and resource waste. Utility Model Content
[0003] In view of the shortcomings of the existing technology, the purpose of this utility model is to provide a wedge gate valve with low maintenance cost, long maintenance cycle and stable sealing performance.
[0004] To achieve the above objectives, this utility model provides the following technical solution: a bidirectional sealing wedge gate valve, comprising a valve body, a gate plate located within the valve body, a valve seat capable of forming a hard seal with the gate plate, and a valve stem capable of driving the gate plate to move up and down. The gate plate includes a wedge body connected to the valve stem and two sealing plates located on both sides of the wedge body. The upper and lower edges of the two sealing plates are respectively provided with upper hook feet and lower hook feet. The upper and lower surfaces of the wedge body are respectively provided with upper limit bars and lower limit bars that can extend into the corresponding upper hook foot cavity and lower hook foot cavity. The width of the inner cavity of the upper hook foot is greater than the width of the upper limit bar, and the width of the inner cavity of the lower hook foot is greater than the width of the lower limit bar. The wedge body has two push rods that are perpendicular to the sealing plate. One end of each push rod touches the two sealing plates, and the other end is located inside the wedge body. The end of the valve stem that enters the wedge body is provided with a wedge block that can simultaneously push the two push rods away from each other. A contact block is provided below the wedge body that touches the bottom of the valve body before the sealing plate. The wedge block pushes the push rods and the sealing plate to move as a whole, so that the sealing plate and the valve seat fit tightly together.
[0005] As a further improvement of this utility model, each of the two sealing plates facing each other is provided with a limiting groove for one end of the corresponding push rod to extend into.
[0006] As a further improvement of this utility model, the height of the upper limit bar is greater than the height of the inner cavity of the upper hook foot.
[0007] As a further improvement of this utility model, the wedge is provided with a centering groove parallel to the valve stem on the side wall perpendicular to the sealing plate, and the valve body is provided with a centering strip that matches the centering groove on the inner wall of the valve body.
[0008] As a further improvement of this utility model, the height of the middle part of the bottom of the inner cavity of the lower hook foot is greater than the height of the two sides of the bottom of the cavity.
[0009] As a further improvement of this utility model, the lower hook foot is provided with a material discharge port at both ends along the width direction of the sealing plate.
[0010] The beneficial effects of this utility model are as follows: By disassembling and assembling the sealing plate relative to the wedge, this design reduces usage costs and resource waste compared to existing technologies, thus achieving both environmental protection and economic benefits. The design of the wedge block pushing the top rod, causing the sealing plate to fit tightly against the valve seat under the push of the top rod, ensures an effective hard seal between the gate and the valve seat even when the gate cannot move downwards to its position. This extends the maintenance cycle, reduces maintenance costs, and provides stable sealing. During the opening process, one sealing plate separates from the corresponding valve seat, and the pressure of the other sealing plate on the corresponding valve seat decreases, thereby improving the gate's opening efficiency. The contact block design prevents the sealing plate 22 from contacting impurities at the bottom of the valve body 1, which could affect its movement. Attached Figure Description
[0011] Figure 1 This is a diagram showing the state of the present invention when no impurities have accumulated. Figure 2 A state diagram of the present invention when impurities are accumulated; Figure 3 for Figure 2 Cross-sectional view of AA; Figure 4 This is a cross-sectional view of the gate and valve stem in this utility model. Figure 5 This is a perspective view of the gate and valve stem connected in this utility model; Figure 6 for Figure 5 Exploded view.
[0012] Reference numerals: 1. Valve body; 11. Centering bar; 2. Gate; 21. Wedge; 22. Sealing plate; 221. Centering groove; 23. Upper hook foot; 24. Lower hook foot; 241. Discharge port; 25. Upper limit bar; 26. Lower limit bar; 27. Push rod; 28. Wedge block; 29. Contact block; 20. Limiting groove; 3. Valve seat; 4. Valve stem. Detailed Implementation
[0013] The present invention will be further described in detail below with reference to the accompanying drawings and embodiments. Identical components are indicated by the same reference numerals.
[0014] Reference Figures 1 to 6 As shown, a bidirectional sealing wedge gate valve of this embodiment includes a valve body 1, a gate 2 located inside the valve body 1, a valve seat 3 that can form a hard seal with the gate 2, and a valve stem 4 that can drive the gate 2 to move up and down. Based on the aforementioned prior art, the gate 2 includes a wedge 21 and two sealing plates 22. The wedge 21 is formed by two half-wedges joined together and connected by welding or bolts. Each of the two half-wedges has a half-rod hole for the valve stem 4 to pass through, a half-piece groove for the wedge block 28 to be accommodated, and a top hole for the top rod 27 to pass through and communicate with the half-piece groove. The inner cavity of the top hole is cuboid. An upper limit strip 25 and a lower limit strip 26 are integrally formed above and below the two half-wedges, respectively. Both the upper limit strip 25 and the lower limit strip 26 are connected to the inclined surface of their respective half-wedges. Each of the two half-wedges has an integrally formed semi-contact block below it, independent of the lower limit strip 26. The upper and lower edges of the two sealing plates 22 are integrally formed with L-shaped upper hook feet 23 and lower hook feet 24, respectively. The groove width formed by the upper hook feet 23 and the sealing plate 22 is greater than the width of the upper limit strip 25. The groove width formed by the lower hook feet 24 and the sealing plate 22 is greater than the width of the lower limit strip 26. The two push rods 27 are adapted to the rod holes. The two ends of the two push rods 27 are respectively inclined and spherical. One end of the valve stem 4 can be connected to a wedge block 28 by welding. During assembly, two half-wedges are placed on either side of the wedge block 28 and moved towards each other until the two half-wedges are joined together to form a complete wedge 21 and connected. The two half-rod holes are joined together to form a complete rod hole that matches the valve stem 4. The two half-contact blocks are joined together to form a complete contact block 29, with the length direction of the top hole perpendicular to the length direction of the valve stem 4. The two half-grooves are joined together to form a complete groove. The wedge block 28 is confined within the groove and can move linearly within it. Then, the valve stem 4 is pulled up so that the upper surface of the wedge block 28 contacts the upper end of the groove. Subsequently, two push rods 27 are inserted into the two top holes, with the beveled ends of the two push rods 27 extending into the groove and the spherical ends being machined. Keeping the inclined surface of the wedge 21 flush with the wedge, the two sealing plates 22 are then fitted onto the two sides of the wedge 21 along the length of the corresponding limiting strips. Finally, the valve stem 4 is released, and the valve stem 4 and the wedge block 28 move downward under the action of gravity and slide relative to the inclined ends of the two push rods 27. The two push rods 27 move away from each other until the spherical ends of the two push rods 27 touch the two sealing plates 22 respectively and push the two sealing plates 22 to move horizontally. After the upper hook foot 23 touches the upper limit strip 25 and the lower hook foot 24 touches the lower limit strip 26, the sealing plate 22 moves into place. The gate 2 with the valve stem 4 is then installed into the valve body, and the valve cover and drive device are installed in sequence for use. Initially, valve stem 4 pulls gate 2 so that the height of gate 2 is greater than the height of the flow channel, and the medium is in a flowing state. Wedge block 28 separates from the two push rods 27, and push rods 27 do not exert any thrust on sealing plate 22. There is a gap between the sealing plate 22 and the inclined surface of the corresponding wedge 21. If an impurity layer accumulates at the bottom of the inner cavity of valve body 1, during the closing process, valve stem 4 and gate 2 move downward as a whole. One side of gate 2 is pushed by the medium, and the sealing plate 22, pushed by the medium, moves towards the wedge 21 and finally engages with it. As the wedge 21 engages, the corresponding push rod 27 retracts into the top hole. The other sealing plate 22 slides relative to the corresponding valve seat 3 and gradually moves towards the wedge 21. The corresponding push rod 27 gradually moves into the top hole until the gate 2 moves downwards into position, the contact block 29 contacts the impurity layer, the wedge 21 stops moving, and a gap exists between the sealing plate 22 and the corresponding valve seat 3. The valve stem 4 continues to move downwards relative to the wedge 21, and the wedge block 28 contacts the two push rods 27 as the valve stem 4 moves vertically downwards. The two push rods 27 slide relative to the wedge block 28 and move horizontally in a straight line. The two sealing plates 22, pushed by the corresponding push rods 27, fit tightly against the corresponding valve seats 3. The valve stem 4 and the wedge block 28 stop moving, and the medium accumulates on one side of the gate 2 and cannot flow. During the opening process, the valve stem 4 drives the wedge block 28 upward and separates it from the push rods 27. The sealing plate 22 in contact with the medium moves towards the wedge body 21 under the push of the medium. The sealing plate 22 separates from the corresponding valve seat 3 and fits tightly against the wedge body 21. The other sealing plate 22 does not exert pressure on the corresponding valve seat 3 without being pushed by the corresponding push rod 27, thereby reducing the friction between the sealing plate 22 and the valve seat 3. As the wedge block 28 contacts the upper end of the groove, the valve stem 4 drives the wedge block 28 and the gate 2 to move upward as a whole, and finally the medium flows again. The gate 2 stays above the flow channel. After the sealing plate 22 is worn, the sealing plate 22 can be moved along the length of the limit strip and removed from the wedge body 21, and then a new sealing plate 22 can be replaced. Compared to existing technologies, this design reduces operating costs and resource waste by replacing the sealing plate 22, thus achieving both environmental and economic benefits. The design of the wedge block 28 pushing the push rod 27 to ensure that the sealing plate 22 is tightly fitted to the valve seat 3 under the push of the push rod 27 can form an effective hard seal between the gate 2 and the valve seat 3 even when the gate 2 cannot move downwards to its position. This helps to extend the maintenance cycle, reduce maintenance costs, and also provides stable sealing performance. During the opening process, one of the sealing plates 22 separates from the corresponding valve seat 3, and the pressure of the other sealing plate 22 on the corresponding valve seat 3 decreases, thereby improving the opening efficiency of the gate 2. The design of the contact block 29 can prevent the sealing plate 22 from contacting impurities at the bottom of the valve body 1, which would affect its movement.
[0015] As one specific implementation method of the improvement, refer to Figure 4As shown, a protrusion is machined on the sealing plate 22 by stamping, and the punched groove is a limiting groove 20. The limiting groove 20 allows the spherical end of the push rod to extend into it. After the sealing plate 22 is fitted onto one side of the wedge 21, the push rod 27 is driven by the wedge block 28 to move towards the corresponding sealing plate 22 until the spherical end of the push rod 27 extends into the limiting groove 20. During the disassembly of the sealing plate 22, the valve stem 4 and the wedge block 28 are first lifted as a whole, and then the sealing plate 22 is pushed towards the wedge 21 so that... The push rod 27 is retracted into the top hole, and then the sealing plate 22 is moved away from the wedge 21 so that the end of the push rod 27 is disengaged from the limiting groove 20. Finally, the sealing plate 22 is moved along the length of the limiting strip and removed from the wedge 21. The design of the end of the push rod 27 being inserted into the limiting groove 20 can improve the connection stability of the sealing plate 22 on the wedge 21, and avoid the phenomenon that the sealing plate 22 moves linearly relative to the wedge 21 during transportation or assembly, thus affecting the assembly and indirectly improving the assembly efficiency of the valve.
[0016] As an improved specific implementation, because the medium contains impurities that remain between the upper hook foot 23 and the upper limit bar 25, the movable distance between the upper hook foot 23 and the upper limit bar 25 is reduced, resulting in the sealing plate 22 failing to fit against the corresponding valve seat 3. To solve the aforementioned problem, refer to... Figure 4 As shown, the height of the upper limit bar 25 is greater than the height of the inner cavity of the upper hook foot 23. Therefore, there is a gap between the upper hook foot 23 and the upper surface of the wedge 21. The height of the impurities accumulated above the wedge 21 is lower than the height of the lowest point of the upper hook foot 23. The upper hook foot 23 can contact the upper limit bar 25 without interference from impurities. This design can increase the number of times the sealing plate 22 and the valve seat 3 are in contact, delay the impact of impurities, and extend the cleaning maintenance cycle.
[0017] As a specific implementation of the improvement, since the gate 2 will tilt relative to the vertical surface due to the thrust of the medium during its downward movement, one of the sealing plates 22 will rub against the corresponding valve seat 3 many times and is prone to damage. To solve the aforementioned problem, refer to Figure 3 As shown, centering grooves 221 are machined on both side walls of the wedge 21 where the sealing plate 22 is not installed. Then, a centering strip 11 matching the centering groove 221 is integrally formed on the inner wall of the valve body 1. This design can ensure that the gate 2 remains vertical during the up and down movement, reduce the wear between the sealing plate 22 and the valve seat 3, indirectly extend the service life of the sealing plate 22, and reduce resource waste.
[0018] As one specific implementation of the improvement, there is a possibility that impurities in the medium may remain in the inner cavity of the lower hook foot 24, causing a reduction in the movable distance between the lower hook foot 24 and the lower limit strip 26, resulting in the sealing plate 22 failing to fit against the corresponding valve seat 3. To solve the aforementioned problem, refer to... Figure 6As shown, two beveled surfaces are machined on the surface of the lower hook foot 24 used to receive impurities through a cutting process. The two beveled surfaces are connected at the higher end and connected to the end edge of the lower hook foot 24 at the other end. The lower limit strip 26 is close to the connection point of the two beveled surfaces. Impurities falling into the inner cavity of the lower hook foot 24 will move along the beveled surfaces to both ends of the lower hook foot 24 and eventually fall to the bottom of the inner cavity of the valve body 1. This design can avoid the interference of impurities with the lower hook foot 24 and ensure that the sealing plate 22 and the corresponding valve seat 3 are effectively fitted.
[0019] As one specific implementation of the improvement, since the width of the gate 2 is similar to the width of the inner cavity of the valve body 1, the small distance between the two ends of the lower hook 24 and the inner wall of the valve body 1 affects the speed of impurity discharge. To solve the aforementioned problem, refer to... Figure 6 As shown, discharge ports 241 are provided at both ends of the lower hook foot 24 along the width direction of the sealing plate 22. This design can accelerate the speed at which impurities fall from the lower hook foot 24.
[0020] The above description is merely a preferred embodiment of this utility model. The protection scope of this utility model is not limited to the above embodiments. All technical solutions falling within the scope of this utility model's concept are protected by this utility model. It should be noted that for those skilled in the art, any improvements and modifications made without departing from the principle of this utility model should also be considered within the protection scope of this utility model.
Claims
1. A bidirectional sealing wedge gate valve, comprising a valve body (1), a gate (2) located within the valve body (1), a valve seat (3) capable of forming a hard seal with the gate (2), and a valve stem (4) capable of driving the gate (2) to move up and down, characterized in that: The gate (2) includes a wedge (21) connected to the valve stem (4) and two sealing plates (22) located on both sides of the wedge (21). The upper and lower edges of the two sealing plates (22) are respectively provided with upper hook feet (23) and lower hook feet (24). The upper and lower surfaces of the wedge (21) are respectively provided with upper limit bars (25) and lower limit bars (26) that can extend into the corresponding cavities of the upper hook feet (23) and lower hook feet (24). The width of the cavity of the upper hook foot (23) is greater than the width of the upper limit bar (25), and the width of the cavity of the lower hook foot (24) is greater than the width of the lower limit bar (26). Two push rods (27) perpendicular to the sealing plate (22) are inserted through the wedge (21). One end of each push rod (27) contacts the two sealing plates (22) respectively, and the other end is located inside the wedge (21). The valve stem (4) is provided with a wedge block (28) that can push the two push rods (27) away from each other at the same time. A contact block (29) is provided below the wedge (21) that contacts the bottom of the valve body (1) before the sealing plate (22). The push rods (27) and the sealing plate (22) are moved as a whole by the wedge block (28) so that the sealing plate (22) and the valve seat (3) fit tightly together.
2. The bidirectional sealing wedge gate valve according to claim 1, characterized in that: Both of the two sealing plates (22) have a limiting groove (20) on their facing surfaces for one end of the corresponding push rod (27) to extend into.
3. A bidirectional sealing wedge gate valve according to claim 1 or 2, characterized in that: The height of the upper limit bar (25) is greater than the height of the inner cavity of the upper hook foot (23).
4. A bidirectional sealing wedge gate valve according to claim 1 or 2, characterized in that: The wedge (21) has a centering groove (221) parallel to the valve stem (4) on its side wall perpendicular to the sealing plate (22), and the valve body (1) has a centering strip (11) matching the centering groove (221) on its inner wall.
5. A bidirectional sealing wedge gate valve according to claim 1 or 2, characterized in that: The height of the middle part of the cavity bottom of the lower hook foot (24) is greater than the height of the two sides of the cavity bottom.
6. A bidirectional sealing wedge gate valve according to claim 5, characterized in that: The lower hook (24) is provided with a material discharge port (241) at both ends along the width direction of the sealing plate (22).