Gate valve capable of being opened and closed more easily

Abstract

The gate valve comprises a valve body, a valve cover, a valve rod, an actuator, a gate plate and a valve seat, an inverted-T-shaped groove is formed in the upper end of the gate plate, and an inverted-T-shaped connecting part matched with the inverted-T-shaped groove is arranged at the lower end of the valve rod; the depth of the inverted-T-shaped groove is larger than the height of the inverted-T-shaped connecting part so that the inverted-T-shaped connecting part can vertically move in the inverted-T-shaped groove, a pressure relief assembly is installed on the gate plate and comprises a pressure relief valve element and a spring, a guide hole is formed in the upper end of the gate plate in the vertical direction, and a water inlet hole and a water outlet hole which are communicated with the guide hole are formed in the two sides of the gate plate respectively. The pressure relief valve element and the spring are arranged in the guide hole from top to bottom, a pressure relief channel is arranged on the pressure relief valve element, and when the pressure relief valve element moves under the action of the valve rod and the spring, the pressure relief valve element has a first position where the pressure relief channel enables the guide hole to be communicated with the water outlet hole and a second position where the pressure relief channel is separated from the water outlet hole. The pressure relief assembly is arranged on the flashboard, so that opening and closing operation of the valve is easier.

Description

TECHNICAL FIELD

[0001] The utility model relates to valve technical field, especially a gate valve that opening and closing operation is more relaxed. BACKGROUND

[0002] At present, the ordinary gate valve that petroleum, petrochemical, chemical industry, electric power, steam and heat conducting oil system mainly apply, its opening and closing piece is the gate plate, the movement direction of gate plate is perpendicular to the fluid direction, and the gate valve can only be fully opened and closed, and cannot be adjusted and throttled. The gate plate has two sealing surfaces, the most commonly used mode gate plate valve forms a wedge with the two sealing surfaces, and the wedge angle is different from the valve parameter, and is usually 5 degrees, and is 3 degrees when the medium temperature is not high.

[0003] Most of the gate valves adopt forced sealing, that is, when the valve is closed, the gate plate is forced to be pressed to the valve seat by external force to ensure the sealing of the sealing surface. The gate plate of the gate valve moves linearly with the valve rod, which is called a lifting rod gate valve, also called a gate valve. When the valve is opened, when the lifting height of the gate plate is equal to 1:1 times of the valve diameter, the fluid channel is completely unobstructed. Therefore, the full opening position of the valve is determined according to the position of the gate plate, that is, the stroke.

[0004] But such valve is difficult to open in the process of opening or closing, that is, the pressure difference on both sides of the gate plate is large, which leads to the difficulty of opening the valve, therefore, it is necessary to improve the existing gate valve to adapt to the high pressure environment, so that the opening of the valve is more relaxed in the high pressure environment. CONTENT OF THE UTILITY MODEL

[0005] The utility model discloses a kind of gate valves that opening and closing operation is more relaxed, the utility model is by being provided with pressure relief assembly on gate plate, so that the opening and closing operation of valve is more relaxed.

[0006] To achieve the above objectives, this utility model provides the following technical solution: a gate valve for easier opening and closing, comprising a valve body, a valve cover, a valve stem, an actuator, a gate, and valve seats. The valve cover is installed on the upper part of the valve body. The valve stem passes through the valve disc and extends into the valve body. The actuator is installed above the valve cover, and its output end is connected to the upper end of the valve stem. The upper end of the gate has an inverted T-shaped groove, and the lower end of the valve stem has an inverted T-shaped connecting part that mates with the inverted T-shaped groove. There are two valve seats, which are installed in the valve body at positions corresponding to both sides of the gate. The inverted T-shaped groove has a large depth. The inverted T-shaped connection is positioned at a height that allows it to move vertically within the inverted T-shaped groove. A pressure relief assembly is installed on the gate plate, comprising a pressure relief valve core and a spring. A guide hole is vertically arranged at the upper end of the gate plate. Inlet and outlet holes connected to the guide hole are respectively provided on both sides of the gate plate. The pressure relief valve core and spring are arranged from top to bottom in the guide hole. A pressure relief channel is provided on the pressure relief valve core. When the pressure relief valve core moves under the action of the valve stem and the spring, it has a first position where the pressure relief channel connects the guide hole and the outlet hole, and a second position where the pressure relief channel is separated from the outlet hole.

[0007] By adopting the above technical solution, when the valve is closed, the pressure relief valve core is in the second position, and the spring is compressed to store energy. When the valve is opened, the valve stem first moves the inverted T-shaped connecting part upwards, while the gate remains stationary. At this time, the pressure relief valve core moves upwards under the action of the spring, and the pressure relief channel on the valve core gradually connects with the outlet hole. This causes the upstream medium to flow sequentially from the inlet hole, guide hole, pressure relief channel, and outlet hole to the downstream, reducing the pressure difference on both sides of the gate. This continues until the inverted T-shaped connecting part abuts against the upper end of the inverted T-shaped groove, at which point the pressure relief valve core moves to the first position, and the pressure relief channel is fully connected to the outlet hole. The valve stem then moves the gate upwards. At this point, because the pressure difference on both sides of the gate is reduced, the valve opening operation is easier and less strenuous. The same principle applies when the valve is closed. Because the gate first abuts against the valve seat, the upstream medium can still flow downstream through the pressure relief assembly, making the pre-closing operation easier. This continues until the inverted T-shaped connecting part of the valve stem completely presses the pressure relief valve core into the guide hole. At this point, the pressure relief valve core reaches the second position, the pressure relief channel is separated from the outlet hole, and the valve is completely closed. Therefore, this structure makes the valve opening and closing operation much easier.

[0008] The present invention is further configured such that the pressure relief channel includes an axial flow channel extending upward from the lower end of the pressure relief valve core, an annular groove disposed on the periphery of the pressure relief valve core, and a plurality of radial through holes connecting the axial flow channel and the annular groove.

[0009] By adopting the above technical solution, an annular groove is set at the outlet end of the pressure relief channel for docking with the water outlet, so that it does not need to be installed at a specific angle. The pressure relief channel and the water outlet can be connected or disconnected by axial movement, making the installation and operation more convenient.

[0010] The present invention is further configured such that a sealing ring for forming a sealing fit with the inner wall of the guide hole is installed on the outer periphery of the pressure relief valve core at the positions corresponding to the upper and lower positions of the annular groove.

[0011] By adopting the above technical solution, when the valve is closed, the upstream medium can be prevented from leaking downstream through the gap between the pressure relief valve core and the inner wall of the guide hole.

[0012] The present invention is further configured such that a washer is sandwiched between the spring and the pressure relief valve core.

[0013] By adopting the above technical solution and setting gaskets, the medium can pass through smoothly while protecting the spring and pressure relief valve core. This not only makes the force on the end of the spring more even, but also prevents the lower end of the pressure relief valve core from being scratched by the spring, thereby improving the service life of the pressure relief assembly.

[0014] The present invention is further configured such that the pressure relief assembly includes a buffer block, the buffer block is disposed on the upper end of the pressure relief valve core, and the upper end of the pressure relief valve core is provided with a positioning groove, and the lower end of the buffer block is provided with a positioning protrusion that matches the positioning groove.

[0015] By adopting the above technical solution, a buffer block is set at the upper end of the pressure relief valve core to buffer when it comes into contact with the inverted T-shaped connection at the lower end of the valve stem, thereby protecting the pressure relief valve core.

[0016] The present invention is further configured such that an installation groove is provided inside the valve body at a position corresponding to both sides of the gate, the valve seat is threadedly connected to the corresponding installation groove, and a sealing gasket is sandwiched between the inner end of the valve seat and the inner end of the installation groove.

[0017] By adopting the above technical solution, the detachable structure of the valve seat not only facilitates the initial assembly, but also makes it easier to replace the valve seat later, thus reducing maintenance costs.

[0018] The present invention is further provided that the inner wall of the valve seat is provided with a plurality of operating grooves along the circumferential direction.

[0019] By adopting the above technical solution, during valve installation, the valve seat can be rotated manually or by inserting a tool into the operating groove of the valve seat, which is more conducive to the installation or disassembly of the valve seat. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the overall structure of the pressure relief component of this utility model when it is fully closed;

[0021] Figure 2 for Figure 1 Enlarged structural diagram of section A in the middle;

[0022] Figure 3This is a schematic diagram of the overall structure of the pressure relief component of this utility model when it is fully open;

[0023] Figure 4 for Figure 3 Enlarged structural diagram of section B in the middle;

[0024] Figure 5 This is a schematic diagram of the mating structure of the inverted T-shaped connecting part and the inverted T-shaped groove of this utility model.

[0025] In the diagram: 1. Valve body; 2. Valve cover; 3. Valve stem; 4. Actuator; 5. Gate; 6. Valve seat; 7. Inverted T-groove; 8. Inverted T-connection; 9. Pressure relief assembly; 10. Pressure relief valve core; 11. Spring; 12. Guide hole; 13. Inlet hole; 14. Outlet hole; 16. Pressure relief channel; 17. Axial flow channel; 18. Annular groove; 19. Radial through hole; 20. Sealing ring; 21. Washer; 22. Buffer block; 23. Positioning groove; 24. Positioning protrusion; 25. Mounting groove; 26. Sealing gasket; 27. Operating groove. Detailed Implementation

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

[0027] Example: As attached Figures 1 to 5The illustrated gate valve, designed for easier opening and closing, includes a valve body 1, a valve cover 2, a valve stem 3, an actuator 4, a gate 5, and a valve seat 6. The valve cover 2 is mounted on the upper part of the valve body 1. The valve stem 3 passes through the valve disc and extends into the valve body 1. The actuator 4 is mounted above the valve cover 2, and its output end is connected to the upper end of the valve stem 3. The upper end of the gate 5 has an inverted T-shaped groove 7, and the lower end of the valve stem 3 has an inverted T-shaped connecting part 8 that mates with the inverted T-shaped groove 7. The valve seat 6 is a wedge. Two valve seats 6 are installed inside the valve body 1 at positions corresponding to both sides of the gate 5, and are used to abut against the gate 5 to form a sealing fit when the valve is closed; the depth of the inverted T-shaped groove 7 is greater than the height of the inverted T-shaped connecting part 8, so that the inverted T-shaped connecting part 8 can move vertically within the inverted T-shaped groove 7, that is, the lower end of the inverted T-shaped connecting part 8 has limiting protrusions extending to both sides, and the two sides of the inner end of the inverted T-shaped groove 7 are provided with grooves for the vertical movement of the limiting protrusions. Its connection structure is similar to that of the prior art. The difference in the connection structure between the valve stem 3 and the gate 5 lies in the fact that the groove depth extending from both sides of the inner end of the inverted T-shaped groove 7 is greater, allowing the valve stem 3 and the gate 5 to generate vertical relative movement within a certain range while connected. A pressure relief assembly 9 is installed on the gate 5, which includes a pressure relief valve core 10 and a spring 11. A guide hole 12 is vertically arranged at the upper end of the gate 5, connecting to but not penetrating the lower end of the gate 5. Inlets are respectively provided on both sides of the gate 5, communicating with the guide hole 12. Water hole 13 and water outlet hole 14 are provided. The pressure relief valve core 10 and spring 11 are arranged from top to bottom in the guide hole 12. The valve core has a cylindrical structure with a chamfer at the lower end to facilitate its insertion into the guide hole 12. The pressure relief valve core 10 is provided with a pressure relief channel 16. When the pressure relief valve core 10 moves under the action of the valve stem 3 and the spring 11, it has a first position in which the pressure relief channel 16 connects the guide hole 12 and the water outlet hole 14, and a second position in which the pressure relief channel 16 is separated from the water outlet hole 14. When the valve is closed, the pressure relief valve core 10 is in the second position, and the spring 11 is compressed and stores energy.When the valve is opened, the valve stem 3 first moves the inverted T-shaped connecting part 8 upward, while the gate 5 remains stationary. At this time, the pressure relief valve core 10 moves upward under the action of the spring 11. The pressure relief channel 16 on the pressure relief valve core 10 gradually connects with the outlet hole 14, causing the upstream medium to flow sequentially from the inlet hole 13, guide hole 12, pressure relief channel 16, and outlet hole 14 to the downstream, reducing the pressure difference on both sides of the gate 5. This continues until the inverted T-shaped connecting part 8 abuts against the upper end of the inverted T-shaped groove 7, and the pressure relief valve core 10 moves to the first position, where the pressure relief channel 16 connects with the outlet hole 14. 4. When the valve is fully open, and the valve stem 3 drives the gate 5 upward, the pressure difference on both sides of the gate 5 decreases, making the valve opening operation easier and less strenuous. The same principle applies when the valve is closed. Since the gate 5 first abuts against the valve seat 6, the upstream medium can still pass through the pressure relief assembly 9 to the downstream, making the pre-closing operation easier. This continues until the inverted T-shaped connecting part 8 of the valve stem 3 completely presses the pressure relief valve core 10 into the guide hole 12. At this point, the pressure relief valve core 10 reaches the second position, the pressure relief channel 16 is separated from the outlet hole 14, and the valve is completely closed. Therefore, this structure makes the valve opening and closing operation easier.

[0028] As attached Figure 2 As shown, the pressure relief channel 16 includes an axial flow channel 17 extending upward from the lower end of the pressure relief valve core 10, an annular groove 18 disposed around the pressure relief valve core 10, and a plurality of radial through holes 19 connecting the axial flow channel 17 and the annular groove 18. The axial flow channel 17 does not penetrate the upper end of the gate plate 5. The outlet end of the pressure relief channel 16 is provided with an annular groove 18 for docking with the water outlet 14, so that it does not need to be installed at a specific angle. The connection or disconnection between the pressure relief channel 16 and the water outlet 14 can be achieved by axial movement, making the installation operation more convenient.

[0029] As attached Figure 2 As shown, a sealing ring 20 is installed on the outer periphery of the pressure relief valve core 10 at a position corresponding to the upper and lower positions of the annular groove 18, respectively, to form a sealing fit with the inner wall of the guide hole 12. An annular groove can be provided on the outer periphery of the pressure relief valve core 10 to embed the sealing ring 20 in the corresponding annular groove. When the valve is closed, it can prevent the upstream medium from leaking downstream through the gap between the pressure relief valve core 10 and the inner wall of the guide hole 12.

[0030] As attached Figure 2 As shown, a washer 21 is sandwiched between the spring 11 and the pressure relief valve core 10. The washer 21 not only ensures that the medium can pass through smoothly, but also protects the spring 11 and the pressure relief valve core 10. It can make the force on the end of the spring 11 more even and prevent the lower end of the pressure relief valve core 10 from being scratched by the spring 11, thereby improving the service life of the pressure relief assembly 9.

[0031] As attached Figure 2As shown, the pressure relief assembly 9 also includes a buffer block 22, which is made of rubber or silicone. The upper end of the buffer block 22 is spherical. The buffer block 22 is disposed on the upper end of the pressure relief valve core 10, and the upper end of the pressure relief valve core 10 is provided with a positioning groove 23. The lower end of the buffer block 22 is provided with a positioning protrusion 24 that matches the positioning groove 23. The buffer block 22 is provided on the upper end of the pressure relief valve core 10 to buffer when it abuts against the inverted T-shaped connecting part 8 at the lower end of the valve stem 3, thereby protecting the pressure relief valve core 10.

[0032] As attached Figure 2 As shown, the valve body 1 has a mounting groove 25 on each side corresponding to the gate 5. The valve seat 6 is threaded into the corresponding mounting groove 25, and a sealing gasket 26 is sandwiched between the inner end of the valve seat 6 and the inner end of the mounting groove 25. In the above structure, the inner wall of the mounting groove 25 is provided with an internal thread, and the outer wall of the valve seat 6 is provided with an external thread that matches the internal thread. The detachable structure of the valve seat 6 not only facilitates the initial assembly but also facilitates the replacement of the valve seat 6 later, reducing maintenance costs.

[0033] As attached Figure 2 As shown, the valve seat 6 has multiple operating grooves 27 arranged circumferentially on its inner wall. During valve installation, the valve seat 6 can be rotated by manually inserting or using a tool into the operating grooves 27, which facilitates the installation or removal of the valve seat 6.

Claims

1. A gate valve for easier opening and closing, comprising a valve body, a valve cover, a valve stem, an actuator, a gate, and valve seats, wherein the valve cover is mounted on the upper part of the valve body, the valve stem passes through the valve disc and extends into the valve body, the actuator is mounted above the valve cover and its output end is connected to the upper end of the valve stem, the upper end of the gate is provided with an inverted T-shaped groove, the lower end of the valve stem is provided with an inverted T-shaped connecting part that mates with the inverted T-shaped groove, and there are two valve seats, which are mounted in the valve body at positions corresponding to both sides of the gate; characterized in that: The depth of the inverted T-shaped groove is greater than the height of the inverted T-shaped connecting part, allowing the inverted T-shaped connecting part to move vertically within the inverted T-shaped groove. A pressure relief assembly is installed on the gate plate, which includes a pressure relief valve core and a spring. A guide hole is provided vertically at the upper end of the gate plate. Water inlet and water outlet holes connected to the guide hole are respectively provided on both sides of the gate plate. The pressure relief valve core and the spring are arranged from top to bottom in the guide hole. A pressure relief channel is provided on the pressure relief valve core. When the pressure relief valve core moves under the action of the valve stem and the spring, it has a first position where the pressure relief channel connects the guide hole and the water outlet hole, and a second position where the pressure relief channel is separated from the water outlet hole.

2. The gate valve with easier opening and closing operation according to claim 1, characterized in that: The pressure relief channel includes an axial flow channel extending upward from the lower end of the pressure relief valve core, an annular groove disposed on the periphery of the pressure relief valve core, and a plurality of radial through holes connecting the axial flow channel and the annular groove.

3. The gate valve with easier opening and closing operation according to claim 2, characterized in that: A sealing ring is installed on the outer periphery of the pressure relief valve core at a position corresponding to the upper and lower positions of the annular groove, respectively, to form a sealing fit with the inner wall of the guide hole.

4. The gate valve with easier opening and closing operation according to claim 1, characterized in that: A washer is sandwiched between the spring and the pressure relief valve core.

5. A gate valve with easier opening and closing operation according to claim 1, characterized in that: The pressure relief assembly also includes a buffer block, which is disposed on the upper end of the pressure relief valve core. The upper end of the pressure relief valve core is provided with a positioning groove, and the lower end of the buffer block is provided with a positioning protrusion that matches the positioning groove.

6. A gate valve with easier opening and closing operation according to claim 1, characterized in that: The valve body has an installation groove on each side of the gate, and the valve seat is threaded into the corresponding installation groove. A sealing gasket is sandwiched between the inner end of the valve seat and the inner end of the installation groove.

7. A gate valve with easier opening and closing operation according to claim 6, characterized in that: The valve seat has multiple operating grooves arranged circumferentially on its inner wall.

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