Adaptive pressure regulating type dark stem gate valve

Abstract

This utility model relates to the field of gate valve technology, and is an adaptive pressure regulating non-stick gate valve used to solve the problem of pressure difference on both sides of the gate. It includes a valve body, a valve cover, a valve stem, a gate, and a valve stem drive component. The valve body has an integrally formed sealing seat protruding forward and backward along the direction perpendicular to the water flow, for the gate to be inserted and sealed. An adaptive pressure regulating structure is provided at the bottom of the sealing seat. The adaptive pressure regulating structure includes an installation groove at the bottom of the valve body, a lower shell tightly fitted within the installation groove, and an upper shell tightly fitted on the lower shell, forming a pressure regulating cavity between the upper and lower shells. A sealing protrusion is formed on the upper surface of the upper shell, which is joined with the sealing seat. A sealing groove is formed between the sealing protrusions for the gate to be inserted and sealed. An inlet and an outlet, communicating with the pressure regulating cavity, are respectively opened at the left and right ends of the upper shell along the front-back direction on the upper shell. An adaptive pressure regulating seal is provided within the pressure regulating cavity.

Description

Technical Field

[0001] This utility model relates to the field of gate valve technology, and in particular to an adaptive pressure regulating non-stick gate valve. Background Technology

[0002] Gate valves, as an important type of shut-off valve, are widely used due to their advantages such as low fluid resistance and unrestricted media flow direction. The working principle of a gate valve is to open and close the pipeline by raising and lowering a gate. In actual use, gate valves are usually required to be in a normally open or normally closed state. When the gate of a gate valve is fully closed, the pressure at its inlet and outlet ends changes significantly. At the inlet end, due to the continuous fluid input and the blockage of the passage, the pressure continuously increases; while at the outlet end, due to the lack of fluid replenishment, the pressure gradually decreases, thus creating a large pressure difference on both sides of the gate. Over time, this persistent pressure difference exerts a significant force on the gate, causing it to bear enormous mechanical stress. Under long-term high stress, the gate is highly susceptible to fatigue damage, eventually leading to fatigue fracture and affecting the normal operation of the gate valve.

[0003] To address the aforementioned issues, this paper proposes a simple, adaptive gate valve with a non-stick stem that can adjust the pressure at both ends of the gate. Utility Model Content

[0004] Therefore, in view of the above problems, this utility model proposes an adaptive pressure regulating gate valve with a hidden stem for solving the problem of pressure difference on both sides of the gate.

[0005] To solve the above-mentioned technical problems, the solution adopted by this utility model is as follows: an adaptive pressure regulating gate valve, including a valve body, a valve cover, a valve stem, a gate, and a valve stem drive component. The valve body is integrally provided with a sealing seat that protrudes forward and backward along the direction perpendicular to the water flow, allowing the gate to be inserted and sealed. An adaptive pressure regulating structure is provided at the bottom of the sealing seat. The adaptive pressure regulating structure includes an installation groove at the bottom of the valve body, a lower shell that is tightly embedded in the installation groove, and an upper shell that is tightly attached to the lower shell. A pressure regulating cavity is formed between the upper shell and the lower shell. A sealing protrusion that splices with the sealing seat is provided on the upper surface of the upper shell. A sealing groove for the gate to be inserted is formed between the sealing protrusions. An inlet and an outlet that communicate with the pressure regulating cavity are respectively opened on the left and right ends of the upper shell along the front and rear directions. An adaptive pressure regulating seal is provided between the inlet and the outlet in the pressure regulating cavity to seal and isolate the inlet and outlet.

[0006] A further improvement is that the adaptive pressure regulating seal is a plurality of elastic sealing strips laid in the pressure regulating cavity along the front-back direction. The front and rear end faces of the elastic sealing strips are in contact with the front and rear inner walls of the pressure regulating cavity, and the top and bottom of the elastic sealing strips are in close contact with the top surface and the ground surface of the pressure regulating cavity, respectively.

[0007] A further improvement is that the elastic sealing strip is thick-walled and hollow.

[0008] A further improvement is that the cross-section of the elastic sealing strip is circular or rectangular.

[0009] A further improvement is that the elastic sealing strip is made of silicone rubber.

[0010] A further improvement is made as follows: a sealing groove is provided around the mounting groove; a lower convex edge and an upper convex edge are respectively provided around the lower housing and the upper housing; the upper convex edge and the lower convex edge are embedded in the sealing groove; a first sealing gasket is provided between the lower convex edge and the bottom of the sealing groove; a second sealing gasket is provided between the lower convex edge and the upper convex edge; a plurality of mounting holes are provided on the upper convex edge, the second sealing gasket, the lower convex edge, and the first sealing gasket; a plurality of threaded mounting holes are correspondingly provided at the bottom of the sealing groove; bolts are inserted into the mounting holes; the countersunk head of the bolt abuts against the upper convex edge; and the lower end is screwed into the threaded mounting hole.

[0011] A further improvement is that the outer surface of the gate is provided with a rubber coating layer.

[0012] By adopting the aforementioned technical solution, the beneficial effects of this utility model are:

[0013] 1. This utility model incorporates an adaptive pressure regulating structure at the bottom of the valve body. When the gate is closed and a pressure difference arises between the inlet and outlet, the elastic sealing strip within the pressure regulating chamber moves towards the low-pressure side under pressure, increasing the volume of the valve body's inlet and buffering the sudden increase in water pressure. This process effectively reduces the pressure difference across the gate, significantly decreasing the mechanical stress borne by the gate, preventing fatigue damage and fracture caused by prolonged exposure to high stress, and significantly extending the service life of the gate and the entire gate valve. It also reduces the frequency of replacements and maintenance costs due to gate damage.

[0014] 2. The elastic sealing strip adopts a thick-walled hollow design, which increases its lateral compression, allowing for more complete deformation under pressure and further improving the buffering and pressure regulation effect.

[0015] 3. When the elastic sealing strip is compressed laterally, it increases the pressure between the bottom and top of the strip and the top and bottom surfaces of the pressure regulating chamber, thereby improving its sealing performance during operation, effectively preventing fluid leakage in the pressure regulating chamber, and ensuring the stable realization of the pressure regulating function.

[0016] 4. After the gate is opened, the pressure at the inlet and outlet of the gate valve is the same, and the elastic sealing strip can automatically and elastically return to its original position without the need for an additional reset device. This avoids complex mechanical structures and improves the convenience and flexibility of using the gate valve.

[0017] 5. The upper and lower housings of the adaptive pressure regulating structure mate with the sealing grooves around the mounting groove via the lower and upper protruding edges. Combined with the first and second sealing gaskets and the tightening of bolts, this forms a stable and well-sealed integral structure. This modular assembly structure facilitates the assembly of components, and in case of damage, only the corresponding parts need to be replaced.

[0018] 6. The rubber coating layer on the outer surface of the gate not only increases the sealing effect between the gate and the sealing seat and sealing groove, but also reduces the manufacturing precision requirements of the sealing seat and sealing groove. Under the premise of ensuring sealing performance, it reduces production and processing costs and improves production efficiency. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the internal structure of the adaptive pressure regulating non-stick gate valve in the open state according to an embodiment of this utility model.

[0020] Figure 2 This is a schematic diagram of the internal structure of the adaptive pressure regulating non-stick gate valve in the closed state according to an embodiment of this utility model.

[0021] Figure 3 yes Figure 1 Enlarged view of the local structure at point A in the middle.

[0022] Figure 4 yes Figure 2 Enlarged view of the local structure at point B. Detailed Implementation

[0023] The present invention will now be further described in conjunction with the accompanying drawings and specific embodiments.

[0024] refer to Figures 1 to 4The present invention discloses an adaptive pressure regulating gate valve with a non-stick stem, comprising a valve body 10, a valve cover 11, a valve stem 12, a gate 13, and a valve stem drive 14. The valve cover 11 is bolted and tightly fitted onto the valve body 10, and a gate cavity 15 is formed between the valve cover 11 and the valve body 10 for raising and lowering the gate 13. The valve stem 12 is rotatably and sealingly mounted on the valve cover 11. The gate 13 is threaded and rotatably mounted on the lower end of the valve stem 12. The gate 13 has a valve stem passage 16 inside for accommodating the installation of the valve stem 12 and providing an insertion point for the valve stem 12. The valve stem drive 14 is disposed on the top of the valve stem 12 to drive the valve stem 12 to rotate. The valve body 10 is integrally provided with a sealing seat 17 that protrudes forward and backward along the direction perpendicular to the water flow, allowing the gate plate 13 to be inserted and sealed. The bottom of the sealing seat 17 is provided with an adaptive pressure regulating structure that adaptively adjusts the left and right pressures of the gate plate 13 after sealing, thereby reducing mechanical stress on the gate plate 13. The adaptive pressure regulating structure includes an installation groove 18 located at the bottom of the valve body 10, a lower housing 19 tightly fitted within the installation groove 18, and an upper housing 20 tightly fitted onto the lower housing 19. A pressure regulating cavity 21 is formed between the upper housing 20 and the lower housing 19. A sealing protrusion 22 protrudes upward from the upper surface of the upper housing 20, splicing with the sealing seat 17. A sealing groove 23 is formed between the sealing protrusions 22, allowing the gate plate 13 to be inserted and sealed. The outer surface of the gate plate 13 is provided with an adhesive layer 24 to enhance the sealing effect between the gate plate 13 and the sealing seat 17 and sealing groove 23, and to reduce the manufacturing precision requirements of the sealing seat 17 and sealing groove 23.

[0025] The upper housing 20 is provided with an inlet 25 and an outlet 26 at the left and right ends of the pressure regulating cavity 21, respectively, along the front and rear direction. An adaptive pressure regulating seal is provided in the pressure regulating cavity 21 between the inlet 25 and the outlet 26 to seal and isolate the inlet 25 and the outlet 26.

[0026] The adaptive pressure regulating seal consists of six elastic sealing strips 27 laid along the front-to-back direction within the pressure regulating cavity 21. The front and rear end faces of the elastic sealing strips 27 are in contact with the front and rear inner walls of the pressure regulating cavity 21, and the top and bottom of the elastic sealing strips 27 are in contact with the top and bottom surfaces of the pressure regulating cavity 21, respectively. The elastic sealing strips 27 are made of silicone rubber. The elastic sealing strips 27 are thick-walled and hollow to enhance their deformable space and improve buffering and pressure regulating effects. The cross-section of the elastic sealing strips 27 is circular or rectangular, preferably circular.

[0027] A sealing groove 28 is provided around the mounting groove 18. A lower protruding edge 29 and an upper protruding edge 30 are respectively provided around the lower housing 19 and the upper housing 20. The upper protruding edge 30 and the lower protruding edge 29 are embedded in the sealing groove 28. A first sealing gasket 31 is provided between the lower protruding edge 29 and the bottom of the sealing groove 28. A second sealing gasket 32 ​​is provided between the lower protruding edge 29 and the upper protruding edge 30. A plurality of mounting holes are provided on the upper protruding edge 30, the second sealing gasket 32, the lower protruding edge 29, and the first sealing gasket 31. A plurality of threaded mounting holes are correspondingly provided at the bottom of the sealing groove 28. A bolt 33 is inserted into the mounting hole. The top of the bolt is countersunk and abuts against the upper protruding edge 30. The lower end is screwed into the threaded mounting hole.

[0028] The working principle of the adaptive pressure regulating gate valve with a non-stick stem: After the gate 13 is closed, the water pressure at the left end (i.e., the inlet end) increases, while the water pressure at the right end (i.e., the outlet end) decreases. Under this pressure difference, the elastic sealing strip 27 is pushed to the right, increasing the volume at the inlet end of the valve body 10, buffering the sudden increase in water pressure, and effectively protecting the gate 13. The hollow design of the elastic sealing strip 27 increases its lateral compression, further improving the buffering and pressure regulating effect. While being laterally compressed, it also increases the bottom and top clamping force, improving the sealing performance during the movement of the elastic sealing strip 27. Simultaneously, it increases the frictional resistance between the elastic sealing strip 27 and the top and bottom surfaces of the pressure regulating chamber 21, enhancing the buffering effect. After the gate 13 is opened, the pressure at the inlet and outlet ends of the gate valve is consistent, and the elastic sealing strip 27 automatically and elastically returns to its original position.

[0029] The foregoing has shown and described the basic principles, main features, and advantages of this utility model. Those skilled in the art should understand that this utility model is not limited to the above embodiments. The embodiments and descriptions above are only illustrative of the principles of this utility model. Various changes and modifications may be made to this utility model without departing from the spirit and scope of this utility model. All such changes and modifications fall within the scope of protection of this utility model as defined by the appended claims and their equivalents.

Claims

1. An adaptive pressure-regulating non-rising stem gate valve, comprising a valve body, valve cover, valve stem, gate, and valve stem drive component, characterized in that: The valve body is integrally provided with a sealing seat that protrudes forward and backward along the direction perpendicular to the water flow, allowing the gate plate to be inserted and sealed tightly. The bottom of the sealing seat is provided with an adaptive pressure regulating structure. The adaptive pressure regulating structure includes an installation groove at the bottom of the valve body, a lower housing fitted into the installation groove, an upper housing fitted onto the lower housing, and a pressure regulating cavity formed between the upper and lower housings. The upper surface of the upper housing has a sealing protrusion that is spliced ​​with the sealing seat, and a sealing groove is formed between the sealing protrusions for the gate plate to be inserted. The upper housing has an inlet and an outlet connected to the pressure regulating cavity at the left and right ends of the pressure regulating cavity along the front and rear directions, respectively. An adaptive pressure regulating seal is provided between the inlet and outlet in the pressure regulating cavity to seal and isolate the inlet and outlet.

2. The adaptive pressure regulating gate valve with non-sunken stem according to claim 1, characterized in that: The adaptive pressure regulating seal is a plurality of elastic sealing strips laid in the pressure regulating cavity along the front-back direction. The front and rear end faces of the elastic sealing strips are in contact with the front and rear inner walls of the pressure regulating cavity, and the top and bottom of the elastic sealing strips are in contact with the top surface and the ground surface of the pressure regulating cavity, respectively.

3. The adaptive pressure regulating gate valve with non-sunken stem according to claim 2, characterized in that: The elastic sealing strip is thick-walled and hollow.

4. The adaptive pressure regulating gate valve with non-sunken stem according to claim 3, characterized in that: The cross-section of the elastic sealing strip is circular or rectangular.

5. The adaptive pressure regulating gate valve with non-sunken stem according to claim 4, characterized in that: The elastic sealing strip is made of silicone rubber.

6. The adaptive pressure regulating gate valve with non-sunken stem according to any one of claims 1-5, characterized in that: A sealing groove is provided around the mounting groove. The lower housing and the upper housing are respectively provided with a lower protrusion and an upper protrusion. The upper and lower protrusions are embedded in the sealing groove. A first sealing gasket is provided between the lower protrusion and the bottom of the sealing groove. A second sealing gasket is provided between the lower and upper protrusions. The upper protrusion, the second sealing gasket, the lower protrusion, and the first sealing gasket have several mounting holes. A number of threaded mounting holes are correspondingly provided at the bottom of the sealing groove. Bolts are inserted into the mounting holes. The top of the bolt is countersunk and abuts against the upper protrusion, and the lower end is screwed into the threaded mounting hole.

7. The adaptive pressure regulating gate valve with non-sunken stem according to any one of claims 1-5, characterized in that: The outer surface of the gate is provided with a rubber coating layer.

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