Pressure self-balancing type low-torque wedge gate valve
By setting a balancing hole on the gate plate for internal pressure balancing, the problem of size restrictions and cost increase of existing gate valves when installing a bypass valve under high temperature, high pressure or large diameter conditions is solved, and low torque and low cost pressure self-balancing is achieved. type gate valve.
Patent Information
- Application Number
- CN202421219932.0
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-05-30
- Publication Date
- 2025-01-21
- Estimated Expiration
- 2034-05-30
AI Technical Summary
When existing gate valves are used under high temperature and high pressure or large diameter conditions, there are problems of specification limitations and cost increase when installing bypass valves to balance pressure.
Design a kind of pressure self -balanced low -torque wedge -type gate valve. By setting up two balance holes on the gate for pressure, the internal pressure balance is used to replace the peripheral structure to achieve the pressure balance when the valve is closed.
The valve opening and closing torque is reduced, the structure is simple and reliable, not limited by valve specifications, and the production cost is significantly reduced.
Smart Images
Figure CN222377271U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of valves, in particular to a pressure self-balancing low-torque wedge-type gate valve. Background Art
[0002] The gate valve is suitable for various pipeline systems of water, oil, steam and other media. It relies on the vertical movement of the gate along the axis of the flow channel to open or cut off the flow of the medium. The gate valve is a forced seal, with large opening and closing torque, easy scratching of the sealing surface, and short service life. Valves used in special working conditions of high temperature, high pressure or large-diameter valves will be installed with bypass valves to balance the pressure at the inlet and outlet. Before the pipeline is opened, the pressure is released through the bypass valve to avoid the sudden surge of high pressure from impacting the pipeline at the outlet of the valve; or the pressure difference between the inlet and outlet of the valve is too large, and the opening torque is too large. In order to avoid damage to the valve by torque, the bypass valve is opened to release the pressure before opening the gate valve. However, this structure has the defects of installation of bypass valves being limited by valve specifications and significantly increasing costs. Therefore, it is necessary to design a pressure self-balancing low-torque wedge gate valve that is not limited by valve specifications and has low cost to solve the above problems. Utility Model Content
[0003] The purpose of the utility model is to provide a pressure self-balancing low-torque wedge-type gate valve. When the valve is opened, the utility model can balance the pressure at both ends of the inlet and outlet through the pressure relief hole, so that the valve opening and closing torque is smaller. The structure is simple and reliable, not limited by valve specifications, and significantly reduces the production cost.
[0004] To achieve the above-mentioned purpose, the utility model provides the following technical solutions: a pressure self-balancing low-torque wedge-type gate valve, comprising a valve stem, a gate connected to the valve stem, and a valve seat for forming a sealing fit with the gate when the valve is closed, the gate is in a wedge shape, the upper end of the gate is provided with an inverted T-shaped connecting groove, the lower end of the valve stem is provided with an inverted T-shaped connecting part that forms a limiting fit with the inverted T-shaped connecting groove; the inverted T-shaped connecting part can slide vertically in the inverted T-shaped connecting groove, the inner end of the inverted T-shaped connecting groove is vertically provided with a guide hole that is coaxial with the valve stem, a balancing plug is axially slidably provided in the guide hole, and the balancing plug is gap-matched with the guide hole, the inner end of the guide hole is coaxially provided with a middle hole, the inner diameter of the middle hole is smaller than the inner diameter of the guide hole, one end of the gate is provided with a first balancing hole connected to the middle hole, and the other end of the gate is provided with a second balancing hole connected to the inverted T-shaped connecting groove.
[0005] By adopting the above technical scheme, two balancing holes are arranged on the gate plate for pressure relief, and the internal pressure balance is adopted to replace the original external bypass structure, that is, when the valve is closed, the valve stem drives the gate plate to move downward, and when the sealing surface of the gate plate is tightly fitted with the sealing surface of the valve seat, the inverted T-shaped connecting part on the valve stem is pressed on the balancing plug at the bottom of the inverted T-shaped connecting groove of the gate plate, so that the balancing plug blocks the inner end of the middle hole of the gate plate, cuts off the medium and ensures the sealing; when the valve is opened, the valve stem drives the gate plate to move upward, and at this time, the inverted T-shaped connecting part at the bottom of the valve stem is separated from the balancing plug, and the medium passes through the pressure relief hole at the gate plate balancing plug, that is, the medium passes through the first balancing hole, the middle hole, the guide hole, the inverted T-shaped connecting groove and the second balancing hole in sequence, balances the pressures at both ends of the inlet and outlet, and reduces the opening and closing torque of the valve. The structure is simple and reliable, is not limited by the valve specifications, and significantly reduces the production cost.
[0006] The utility model is further configured that a conical sealing portion is provided at the bottom of the balancing plug, and a conical expansion opening matched with the conical sealing portion is provided at the upper end of the middle hole.
[0007] By adopting the above technical solution, not only can the balancing plug and the center hole fit more tightly and have better sealing when the valve is closed, but the conical sealing surface can also increase the fitting area, which can avoid stress concentration from damaging the surface of the balancing plug, thereby increasing its service life.
[0008] The utility model is further configured such that the extension directions of the first balancing hole and the second balancing hole are respectively perpendicular to the two end surfaces of the gate plate.
[0009] By adopting the above technical solution, not only is the processing convenient, but also the resistance to the passage of the medium can be reduced.
[0010] The utility model is further configured such that the bottom end of the inverted T-shaped connecting portion is in a dome shape.
[0011] By adopting the above technical solution, when the valve stem moves downward, the dome surface of the inverted T-shaped connecting portion at the lower end thereof abuts against the balancing plug, which can protect the balancing plug.
[0012] The utility model is further configured that the front and rear ends of the inverted T-shaped connecting groove pass through the gate plate.
[0013] By adopting the above technical solution, not only is the processing convenient, but it is also convenient for installing and disassembling the inverted T-shaped connecting part of the valve stem.
[0014] The utility model is further configured that two guide blocks are respectively arranged on the front and rear sides of the gate plate, and a guide groove is formed between the two guide blocks on the same side.
[0015] By adopting the above technical solution, the guide groove is used to cooperate with the guide convex strip inside the valve body, so that the gate plate can stably rise or fall under the drive of the valve stem to realize the opening and closing operation of the valve.
[0016] The utility model is further configured that an annular groove is arranged on the outer periphery of the gate plate, and the annular groove forms an annular sealing portion at each end of the gate plate, and the two annular sealing portions have a similar thickness.
[0017] By adopting the above technical solution, the production of the gate plate can save more materials, reduce production costs, and also make the weight of the gate plate lighter. BRIEF DESCRIPTION OF THE DRAWINGS
[0018] Figure 1 A three-dimensional diagram of the utility model as a whole;
[0019] Figure 2 It is a side view of the utility model as a whole;
[0020] Figure 3 for Figure 2 AA section view;
[0021] Figure 4 It is a cross-sectional view of the gate of the utility model.
[0022] In the figure: 1. valve stem; 2. gate; 3. valve seat; 4. inverted T-shaped connecting groove; 5. inverted T-shaped connecting part; 6. guide hole; 7. balance plug; 8. center hole; 9. first balance hole; 10. second balance hole; 11. conical sealing part; 12. conical expansion; 13. guide block; 14. guide groove; 15. annular groove; 16. annular sealing part. DETAILED DESCRIPTION
[0023] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.
[0024] Example: As attached Figures 1 to 4The pressure self-balancing low-torque wedge-type gate valve shown in the figure comprises a valve stem 1, a gate plate 2 connected to the valve stem 1, and a valve seat 3 used to form a sealing fit with the gate plate 2 when the valve is closed. The gate plate 2 is in a wedge shape, and an inverted T-shaped connecting groove 4 is provided at the upper end of the gate plate 2. An inverted T-shaped connecting portion 5 is provided at the lower end of the valve stem 1 to form a limited fit with the inverted T-shaped connecting groove 4. The inverted T-shaped connecting portion 5 and the valve stem 1 are an integrated structure, and there is a gap between the T-shaped connecting portion and the T-shaped connecting groove; the inverted T-shaped connecting portion 5 can slide vertically in the inverted T-shaped connecting groove 4. A guide hole 6 which is coaxial with the valve stem 1 is vertically arranged at the inner end of the inverted T-shaped connecting groove 4, a balancing plug 7 is axially slidably arranged in the guide hole 6, and the balancing plug 7 is clearance-matched with the guide hole 6, a middle hole 8 is coaxially arranged at the inner end of the guide hole 6, the inner diameter of the middle hole 8 is smaller than the inner diameter of the guide hole 6, and a limiting step is formed between the middle hole 8 and the guide hole 6, one end of the gate plate 2 is provided with a first balancing hole 9 which is connected with the middle hole 8, and the other end of the gate plate 2 is provided with a second balancing hole 10 which is connected with the inverted T-shaped connecting groove 4. Two balancing holes are arranged on the gate plate 2 for pressure relief, and internal pressure balance is adopted to replace the original external bypass structure, that is, when the valve is closed, the valve stem 1 drives the gate plate 2 to move downward, and when the sealing surface of the gate plate 2 is tightly fitted with the sealing surface of the valve seat 3, the inverted T-shaped connecting part 5 on the valve stem 1 is pressed on the balancing plug 7 at the bottom of the inverted T-shaped connecting groove 4 of the gate plate 2, so that the balancing plug 7 blocks the inner end of the middle hole 8 of the gate plate 2, and cuts off the medium to ensure sealing; when the valve is opened, the valve stem 1 drives the gate plate 2 to move upward, and at this time, the inverted T-shaped connecting part 5 at the bottom of the valve stem 1 is separated from the balancing plug 7, and the medium passes through the pressure relief hole at the balancing plug 7 of the gate plate 2, that is, the medium passes through the first balancing hole 9, the middle hole 8, the guide hole 6, the inverted T-shaped connecting groove 4 and the second balancing hole 10 in sequence, balances the pressure at both ends of the inlet and outlet, and reduces the valve opening and closing torque. Its structure is simple and reliable, is not limited by valve specifications, and significantly reduces the production cost.
[0025] As attached Figure 3 and attached Figure 4 As shown, the bottom of the balancing plug 7 is provided with a conical sealing portion 11, and the upper end of the middle hole 8 is provided with a conical expansion 12 matched with the conical sealing portion 11. This design not only makes the balancing plug 7 and the middle hole 8 fit more tightly when the valve is closed, and the sealing is better, but also the conical sealing surface increases the fitting area, which can avoid stress concentration from damaging the surface of the balancing plug 7, thereby prolonging its service life.
[0026] As attached Figure 3 or attached Figure 4 As shown, the extending directions of the first balancing hole 9 and the second balancing hole 10 are respectively perpendicular to the two end faces of the gate plate 2. This design is not only convenient for processing, but also can reduce the resistance of the medium passing through. In addition, the first balancing hole 9 and the second balancing hole 10 are not limited to the setting mode of being perpendicular to the end face of the gate plate, but can also be inclined.
[0027] As attached Figure 3 As shown, the bottom end of the inverted T-shaped connection part 5 is dome-shaped. When the valve stem 1 moves downward, the dome surface of the inverted T-shaped connection part 5 at the lower end thereof abuts against the balancing plug 7, which can protect the balancing plug 7.
[0028] As attached Figure 4 As shown, the front and rear ends of the inverted T-shaped connecting groove 4 pass through the gate plate 2. This design is not only convenient for processing, but also conducive to the installation and removal of the inverted T-shaped connecting portion 5 of the valve stem 1.
[0029] As attached Figure 1 As shown, two guide blocks 13 are respectively arranged on the front and rear sides of the gate plate 2, and a guide groove 14 is formed between the two guide blocks 13 on the same side, and the guide groove 14 extends vertically. The guide groove 14 is used to cooperate with the guide convex strip inside the valve body, so that the gate plate 2 can be stably raised or lowered under the drive of the valve stem 1 to realize the opening and closing operation of the valve.
[0030] As attached Figure 1 and attached Figure 4 As shown, the outer periphery of the gate plate 2 is provided with an annular groove 15, which extends in the circumferential direction. The annular groove 15 forms an annular sealing portion 16 at each end of the gate plate 2, and the two annular sealing portions 16 have the same thickness. This design saves more materials and reduces production costs in the production of the gate plate 2, and also makes the weight of the gate plate 2 lighter.
Claims
1. A pressure self-balancing low-torque wedge-type gate valve, comprising a valve stem (1), a gate plate (2) connected to the valve stem (1), and a valve seat (3) for forming a sealing fit with the gate plate (2) when the valve is closed, wherein the gate plate (2) is in a wedge shape, an inverted T-shaped connecting groove (4) is provided at the upper end of the gate plate (2), and an inverted T-shaped connecting portion (5) is provided at the lower end of the valve stem (1) for forming a limiting fit with the inverted T-shaped connecting groove (4); characterized in that: The inverted T-shaped connecting portion (5) can slide vertically in the inverted T-shaped connecting groove (4); a guide hole (6) which is coaxial with the valve stem (1) is vertically arranged at the inner end of the inverted T-shaped connecting groove (4); a balancing plug (7) is axially slidably arranged in the guide hole (6), and the balancing plug (7) is clearance-matched with the guide hole (6); a center hole (8) is coaxially arranged at the inner end of the guide hole (6); the inner diameter of the center hole (8) is smaller than the inner diameter of the guide hole (6); a first balancing hole (9) which is connected to the center hole (8) is arranged at one end of the gate plate (2); and a second balancing hole (10) which is connected to the inverted T-shaped connecting groove (4) is arranged at the other end of the gate plate (2).
2. The pressure self-balancing low torque wedge gate valve according to claim 1 is characterized in that: The bottom of the balancing plug (7) is provided with a conical sealing portion (11), and the upper end of the middle hole (8) is provided with a conical expansion opening (12) matching with the conical sealing portion (11).
3. The pressure self-balancing low torque wedge gate valve according to claim 1 is characterized in that: The extension directions of the first balancing hole (9) and the second balancing hole (10) are respectively perpendicular to the two end surfaces of the gate plate (2).
4. The pressure self-balancing low torque wedge gate valve according to claim 1 is characterized in that: The bottom end of the inverted T-shaped connecting portion (5) is in a dome shape.
5. The pressure self-balancing low torque wedge gate valve according to claim 1 is characterized in that: The front and rear ends of the inverted T-shaped connecting groove (4) pass through the gate plate (2).
6. The pressure self-balancing low torque wedge gate valve according to claim 1, characterized in that: Two guide blocks (13) are respectively arranged on the front and rear sides of the gate plate (2), and a guide groove (14) is formed between the two guide blocks (13) on the same side.
7. The pressure self-balancing low torque wedge gate valve according to claim 1, characterized in that: An annular groove (15) is provided on the outer periphery of the gate plate (2), and the annular groove (15) enables an annular sealing portion (16) to be formed at each end of the gate plate (2), and the two annular sealing portions (16) have a similar thickness.