Hydraulic anti-seepage gate valve

Abstract

This utility model discloses a hydraulic anti-leakage gate valve, comprising: a valve body, a gate, a valve stem, a valve cover, a first sealing ring, a pressure screw, and a piston. A flange extending upwards is provided in the middle of the valve body, and the valve cover is mounted on the flange. The valve stem is vertically mounted in the valve cover. The gate is located at the bottom of the valve stem, and annular first sealing surfaces are provided on both sides of the gate. A second sealing surface corresponding to the first sealing surface is provided in the valve body. An annular groove is recessed on the first sealing surface, and the first sealing ring is located in the annular groove. A ring plate is located at the bottom of the annular groove. A liquid storage hole extending downwards into the gate is provided at the top of the valve stem. The pressure screw is located at the top of the liquid storage hole, which contains pressurized solution. A guide hole connected to the liquid storage hole is provided in the annular groove, and the piston is located in the guide hole. A connecting rod is provided between the piston and the ring plate for double sealing, resulting in good anti-leakage performance. The first sealing ring is low in cost and easy to replace.

Description

Technical Field

[0001] This utility model relates to the field of gate valves, and in particular to a hydraulically operated anti-leakage gate valve. Background Technology

[0002] In a gate valve, the gate moves perpendicular to the fluid direction, and the valve is fully opened or fully closed by the raising and lowering of the gate. The gate valve achieves sealing through the contact surface between the valve body and the gate. Gates are classified as rigid or resilient, and based on the type of gate, gate valves are further categorized as rigid gate valves or resilient gate valves.

[0003] Rigid gate valves require high precision machining of the sealing surface, and if particles adhere to the sealing surface, it can easily lead to seal failure. Flexible gate valves require high material elasticity, but the material tends to harden after a period of use, causing the gate valve to not close tightly and resulting in slow fluid leakage. This necessitates complete replacement, which is costly and requires improvement. Utility Model Content

[0004] The purpose of this utility model is to provide a hydraulic anti-leakage gate valve that improves the sealing effect after the gate valve is closed and reduces leakage problems.

[0005] To achieve this objective, the present invention adopts the following technical solution:

[0006] A hydraulically operated leak-proof gate valve includes: a valve body, a gate, a valve stem, a valve cover, a first sealing ring, a pressure screw, and a piston. The valve body has an upwardly extending flange at its center, the valve cover is mounted on the flange, the valve stem is vertically mounted within the valve cover, the gate is located at the bottom of the valve stem, and annular first sealing surfaces are provided on both sides of the gate. The valve body has second sealing surfaces corresponding to the first sealing surfaces. An annular groove is recessed on the first sealing surface, the first sealing ring is located within the annular groove, and an annular plate is located at the bottom of the annular groove. A liquid storage hole extending downwards into the gate is located at the top of the valve stem, and pressurized solution is stored in the liquid storage hole. A guide hole connected to the liquid storage hole is located in the annular groove, and the piston is located within the guide hole. A connecting rod is provided between the piston and the annular plate.

[0007] The pressure solution is either pure water or hydraulic oil.

[0008] The valve cover is rotatably provided with a valve stem nut corresponding to the valve stem, and the valve stem is provided with a first external thread corresponding to the valve stem nut.

[0009] The valve cover is provided with a threaded sleeve at the top for axially limiting the valve stem nut, and the valve cover is provided with a second external thread corresponding to the threaded sleeve.

[0010] The upper part of the valve stem nut extends above the threaded sleeve, and a handle is provided on the upper outer wall of the valve stem nut.

[0011] A partition is provided between the valve cover and the flange fitting, and a guide sleeve corresponding to the valve stem is provided in the middle of the partition.

[0012] The guide sleeve is provided with a second sealing ring corresponding to the valve stem.

[0013] The beneficial effects of this utility model are as follows: A hydraulic anti-leakage gate valve can achieve both rigid sealing by the cooperation of the first sealing surface and the second sealing surface, and elastic sealing by the first sealing ring, thus providing double sealing against leakage. It can also compress the pressure solution by the pressure screw and transmit the power to the ring plate by the piston, thereby achieving active pressure on the first sealing ring and further improving the sealing effect. Moreover, the first sealing ring is low in cost and easy to replace. Attached Figure Description

[0014] Figure 1 This is a schematic diagram of the structure of this utility model;

[0015] Figure 2 yes Figure 1 A magnified view of part A in the middle. Detailed Implementation

[0016] The following is combined Figures 1 to 2 The technical solution of this utility model will be further illustrated through specific embodiments.

[0017] like Figure 1 and Figure 2 The hydraulic anti-seepage gate valve shown includes: valve body 1, gate plate 4, valve stem 3, valve cover 5, first sealing ring 19, pressure screw 9 and piston 23. The valve body 1 is provided with an upwardly extending flange fitting 2 in the middle. The valve body 1 and the flange fitting 2 are made of an integrated casting with high strength.

[0018] The valve cover 5 is mounted on the flange fitting 2 and can be fixed with screws. The valve stem 3 is vertically mounted in the valve cover 5. In this embodiment, a partition 17 is provided between the valve cover 5 and the flange fitting 2. A guide sleeve 6 corresponding to the valve stem 3 is provided in the middle of the partition 17 to guide the valve stem 3 during its lifting and lowering. In addition, a second sealing ring 14 corresponding to the valve stem 3 is provided in the guide sleeve 6 to achieve sealing during the lifting and lowering process of the valve stem 3.

[0019] The gate 4 is positioned at the bottom of the valve stem 3 and can be welded in place, allowing the gate 4 and valve stem 3 to move up and down synchronously. For example... Figure 1 and Figure 2As shown, the valve cover 5 is rotatably provided with a valve stem nut 10 corresponding to the valve stem 3 on its top. The valve stem 3 is provided with a first external thread 8 corresponding to the valve stem nut 10. The valve stem 3 can be raised or lowered by rotating the valve stem nut 10.

[0020] The valve cover 5 is provided with a threaded sleeve 12 at its top to axially limit the valve stem nut 10, and a limiting ring 13 located inside the threaded sleeve 12 is provided on the outer circumference of the bottom of the valve stem nut 10 to prevent the valve stem nut 10 from rising or falling. In this embodiment, the valve cover 5 is provided with a second external thread 7 corresponding to the threaded sleeve 12 to facilitate the installation of the threaded sleeve 12.

[0021] like Figure 1 As shown, the upper part of the valve stem nut 10 extends above the threaded sleeve 12, and a handle 11 is provided on the upper outer wall of the valve stem nut 10, which facilitates the rotation of the valve stem nut 10 through the handle 11, making the operation relatively simple.

[0022] like Figure 2 As shown, annular first sealing surfaces 18 are provided on both sides of the gate plate 4, and second sealing surfaces 16 corresponding to the first sealing surfaces 18 are provided in the valve body 1. The first sealing surfaces 18 on both sides are distributed in a V shape and are wedge-shaped rigidly matched with the second sealing surfaces 16 to achieve rigid sealing.

[0023] An annular groove 20 is recessed on the first sealing surface 18, and the first sealing ring 19 is disposed in the annular groove 20 to achieve elastic sealing of the mating surface and further improve the sealing effect. The first sealing ring 19 fits tightly with the annular groove 20 and will not fall off. Moreover, the first sealing ring 19 is low in cost and easy to replace.

[0024] A ring plate 21 is provided at the bottom of the annular groove 20. The ring plate 21 is made of stainless steel and has high strength. A liquid storage hole 15 is provided at the top of the valve stem 3, extending downward into the gate plate 4. The liquid storage hole 15 is filled with a pressurized solution. The pressurized solution can be pure water or hydraulic oil, or it can be the fluid passing through the valve body 1, allowing for flexible selection.

[0025] A guide hole 22 connected to the liquid storage hole 15 is provided in the annular groove 20. The piston 23 is provided in the guide hole 22. A connecting rod 24 is provided between the piston 23 and the ring plate 21. The pressure screw 9 is provided at the top of the liquid storage hole. By rotating the pressure screw 9, the pressure solution is squeezed. The piston 23 transmits power to the ring plate 21 to realize the active pressure of the first sealing ring 19 and further improve the sealing effect.

[0026] The above description is only a preferred embodiment of this utility model. For those skilled in the art, there will be changes in the specific implementation method and application scope based on the idea of ​​this utility model. The content of this specification should not be construed as a limitation of this utility model.

Claims

1. A hydraulically operated leak-proof gate valve, characterized in that, include: The valve comprises a valve body, a gate, a valve stem, a valve cover, a first sealing ring, a pressure screw, and a piston. The valve body has an upwardly extending flange in its middle section. The valve cover is mounted on the flange. The valve stem is vertically mounted within the valve cover. The gate is located at the bottom of the valve stem. The gate has annular first sealing surfaces on both sides. The valve body has second sealing surfaces corresponding to the first sealing surfaces. An annular groove is recessed on the first sealing surface. The first sealing ring is located within the annular groove. An annular plate is located at the bottom of the annular groove. The top of the valve stem has a liquid storage hole extending downwards into the gate. Pressurized solution is stored in the liquid storage hole. The pressure screw is located at the top of the liquid storage hole. A guide hole connected to the liquid storage hole is located in the annular groove. The piston is located within the guide hole. A connecting rod is provided between the piston and the annular plate.

2. The hydraulically operated leak-proof gate valve according to claim 1, characterized in that, The pressure solution is either pure water or hydraulic oil.

3. The hydraulically operated leak-proof gate valve according to claim 1, characterized in that, The valve cover is rotatably provided with a valve stem nut corresponding to the valve stem, and the valve stem is provided with a first external thread corresponding to the valve stem nut.

4. The hydraulically operated leak-proof gate valve according to claim 3, characterized in that, The valve cover is provided with a threaded sleeve at the top for axially limiting the valve stem nut, and the valve cover is provided with a second external thread corresponding to the threaded sleeve.

5. The hydraulically operated leak-proof gate valve according to claim 4, characterized in that, The upper part of the valve stem nut extends above the threaded sleeve, and a handle is provided on the upper outer wall of the valve stem nut.

6. The hydraulically operated leak-proof gate valve according to claim 1, characterized in that, A partition is provided between the valve cover and the flange fitting, and a guide sleeve corresponding to the valve stem is provided in the middle of the partition.

7. The hydraulically operated leak-proof gate valve according to claim 6, characterized in that, The guide sleeve is provided with a second sealing ring corresponding to the valve stem.

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