Gate valve

Abstract

The gate valve comprises a valve body, a gate plate and a driving mechanism, the valve body comprises a valve cavity, the gate plate is movably arranged in the valve cavity, the gate plate is connected with the driving mechanism, the gate plate comprises an overflowing hole, valve holes are formed in the two sides of the valve body, valve seats are arranged at the inner ends of the valve holes, and sealing ring assemblies are arranged on the valve seats. The sealing ring assembly comprises a sealing ring and a plurality of springs, the valve seat comprises an annular mounting groove, openings are formed in the radial inner side of the mounting groove and the axial end corresponding to the gate plate, and the sealing ring is embedded in the mounting groove and is in contact sealing fit with the gate plate; a plurality of mounting holes used for mounting springs are uniformly formed in the other axial end of the mounting groove in the axial direction, the sealing ring assembly further comprises a rigid gasket, the gasket is embedded in the mounting groove, one axial end of the gasket abuts against the sealing ring, and the other axial end of the gasket abuts against the springs in a matched mode. The gate valve has better sealing performance.

Description

Technical Field

[0001] The invention relates to a gate valve. Background Art

[0002] The gate valve is a common shut-off valve widely used in industrial piping systems such as the petroleum, chemical, power, and water supply and drainage industries. To improve the valve's sealing performance, an elastic element is typically installed on the valve seat or behind the sealing ring. The spring force presses the sealing ring against the valve disc, ensuring the seal remains in contact during opening and closing. A commonly used structure in the prior art is to provide a distributed preload force along the entire circumference of the sealing ring, with a spring placed in each mounting hole.

[0003] In this structure, the sealing ring relies primarily on the elastic force provided by the spring to achieve sealing. However, due to manufacturing deviations, installation errors, and performance degradation of the spring after long-term operation, the preload force at each location is often not completely consistent, resulting in differences in the circumferential force on the sealing ring. Insufficient contact pressure in some areas can easily cause leakage, while excessive pressure in other areas can cause localized wear. Summary of the Invention

[0004] The present invention aims to provide a gate valve with better sealing stability.

[0005] The gate valve of the present invention includes a valve body, a gate plate, and a driving mechanism. The valve body includes a valve cavity, the gate plate is movably arranged in the valve cavity, the gate plate and the driving mechanism are connected, the gate plate includes a flow hole, valve holes are arranged on both sides of the valve body, a valve seat is arranged at the inner end of the valve hole, and the valve seat is provided with a sealing ring assembly, the sealing ring assembly includes a sealing ring and multiple springs, the valve seat includes an annular mounting groove, the radial inner side of the mounting groove and the axial end corresponding to the gate plate are both provided with openings, an annular gap is left between the axial end of the mounting groove and the gate plate, the sealing ring is embedded in the mounting groove and contacts and seals with the gate plate, the other axial end of the mounting groove is evenly distributed along the axial direction with multiple mounting holes for installing springs, the sealing ring assembly also includes a rigid gasket, the gasket is embedded in the mounting groove, one axial end of the gasket abuts against the sealing ring, and the other axial end of the gasket abuts against multiple springs.

[0006] By adding a rigid gasket between the sealing ring and the spring, this gate valve can evenly transmit the elastic force of multiple springs to all parts of the sealing ring around the circumference, effectively offsetting the uneven preload force caused by spring manufacturing deviation, installation error and performance degradation, and at the same time avoiding excessive or insufficient local force on the sealing ring due to its own insufficient rigidity, reducing local wear, improving sealing reliability and extending the service life of the gate valve.

[0007] Furthermore, the mounting hole is provided with a communicating port on the inner circumferential wall of the valve seat, and the width of the communicating port along the circumference of the valve seat is smaller than the diameter of the spring, which can prevent the spring from escaping from the communicating port. The mounting hole is connected to the valve hole through the communicating port, which can balance the pressure between the mounting hole and the valve hole. When the valve is in a closed state, the pressure at the mounting hole can be used to cause the sealing ring to be axially pressed and contacted on the gate plate, thereby further improving the sealing effect.

[0008] Furthermore, one end of the communicating port extends to the other axial end face of the mounting groove, and the other axial end of the gasket is evenly distributed along the circumferential direction with a plurality of convex walls, and the plurality of convex walls are embedded in the corresponding communicating ports. Through the embedded cooperation of the convex walls and the communicating ports, the gasket can be prevented from rotating, and the spring can be prevented from being twisted by the circumferential friction force, thereby ensuring the stable operation of the spring. In addition, the contact effect between the gasket and the sealing ring can also be ensured.

[0009] Furthermore, a flat cavity is formed between the other axial end surface of the mounting groove and the other axial end surface of the gasket, and the cavity can increase the contact area between the fluid and the other axial end of the gasket, thereby further improving the sealing effect.

[0010] Furthermore, a sealing ring is provided between the outer peripheral wall of the sealing ring and the inner peripheral wall of the mounting groove, which can prevent the fluid from flowing into the valve cavity along the gap between the sealing ring and the mounting groove. In addition to ensuring good sealing, it is conducive to ensuring smooth opening and closing of the gate.

[0011] Furthermore, the inner circumferential wall of the mounting groove is conical, and its diameter gradually increases toward the gate plate. The outer circumferential walls of the sealing ring and the gasket are both conical. The radial outward pressure of the fluid acting on the inner circumferential walls of the sealing ring and the gasket can be used to drive one axial end of the sealing ring to be pressed against the gate plate, thereby further improving the sealing effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 is a structural diagram of an embodiment of the present invention; Figure 2 is a cross-sectional view of an embodiment of the present invention; Figure 3 In the embodiment of the present invention Figure 2 A partial enlarged view of . DETAILED DESCRIPTION

[0013] The embodiment of the gate valve of the present invention is as follows Figure 1-3As shown, it includes a valve body 1, a gate plate 2, and a driving mechanism 3. The valve body 1 includes a valve cavity 10. The gate plate 2 is movably arranged in the valve cavity 10. The gate plate 2 is connected to the driving mechanism 3. The driving mechanism 3 realizes the opening and closing of the valve by driving the gate plate 2 to move linearly back and forth. The gate plate 2 includes a flow hole 21. Valve holes 11 are provided on both sides of the valve body 1. A valve seat 12 is provided at the inner end of the valve hole 11. The valve seat 12 is provided with a sealing ring assembly. The sealing ring assembly includes a sealing ring 31 and multiple springs 32. The valve seat 12 includes an annular mounting groove 121. The radial inner side of the mounting groove 121 and the gate plate 2 are connected. The corresponding axial ends are each provided with an opening, and an annular gap 13 is left between the axial end of the mounting groove 121 and the gate plate 2. The sealing ring 31 is embedded in the mounting groove 121 and is in sliding contact and sealing cooperation with the gate plate 2. The other axial end of the mounting groove 121 is evenly distributed along the axial direction with a plurality of mounting holes 122 for installing springs 32. The sealing ring assembly also includes a rigid gasket 33, which is preferably made of steel. The gasket 33 is embedded in the mounting groove 121, and one axial end of the gasket 33 abuts against the sealing ring 31, and the other axial end of the gasket 33 abuts against multiple springs 32.

[0014] By adding a rigid gasket 33 between the sealing ring 31 and the spring 32, this gate valve can evenly transmit the elastic force of multiple springs 32 to all parts of the sealing ring 31 around the circumference, effectively offsetting the uneven preload force caused by manufacturing deviation, installation error and performance degradation of the spring 32, and at the same time avoiding excessive or insufficient local force on the sealing ring 31 due to its own insufficient rigidity, reducing local wear, improving sealing reliability, and extending the service life of the gate valve.

[0015] A communicating port 123 is provided on the inner peripheral wall of the valve seat 12 at one axial end of the mounting hole 122. The width of the communicating port 123 along the circumference of the valve seat 12 is smaller than the diameter of the spring 32, which can prevent the spring 32 from radially escaping from the communicating port 123. The mounting hole 122 is connected to the valve hole 11 through the communicating port 123, which can balance the pressure between the mounting hole 122 and the valve hole 11. When the valve is in a closed state, the pressure at the mounting hole 122 can be used to force the sealing ring 31 to be in close contact with the gate plate 2. The fluid pressure at the mounting hole 122 directly acts on the other axial end face of the gasket 33, and indirectly acts on the sealing ring 31 through the gasket 33 to push the sealing ring 31 toward the gate plate 2, thereby further improving the sealing effect.

[0016] One end of the communication port 123 extends to the other axial end face of the mounting groove 121, and the other axial end of the gasket 33 is evenly distributed along the circumferential direction with a plurality of convex walls 331, and the plurality of convex walls 331 are correspondingly embedded in the plurality of communication ports 123. Through the embedded cooperation of the convex walls 331 and the communication ports 123, the gasket 33 can be prevented from rotating, and the end of the spring 32 can be prevented from being twisted by the circumferential friction force, thereby ensuring the stable operation of the spring 32. In addition, the contact effect between the gasket 33 and the sealing ring 31 can also be ensured.

[0017] A flat chamber 124 is formed between the other axial end surface of the mounting groove 121 and the other axial end surface of the gasket 33. The chamber 124 can increase the contact area between the fluid and the other axial end of the gasket 33, thereby further improving the sealing effect.

[0018] A sealing ring 4 is provided between the outer peripheral wall of the sealing ring 31 and the inner peripheral wall of the mounting groove 121, which can prevent the fluid from flowing into the valve cavity 10 along the gap between the sealing ring 31 and the mounting groove 121. In addition to ensuring good sealing, it is also conducive to ensuring smooth opening and closing of the gate plate 2.

[0019] The inner peripheral wall of the mounting groove 121 is conical, and its diameter gradually increases toward the gate plate 2. The outer peripheral walls of the sealing ring 31 and the gasket 33 are both conical. Since the fluid in the valve hole 11 exerts radial outward pressure on the inner peripheral walls of the sealing ring 31 and the gasket 33, this pressure will cause the gasket 33 and the sealing ring 31 to have a tendency to deform radially outward. The axial component force generated during radial contact is used to drive the axial end of the sealing ring 31 to be further pressed against the gate plate 2, which can further improve the sealing effect. The greater the fluid pressure, the more obvious the pressing effect.

[0020] The above embodiment is only one preferred embodiment of the present invention. Common changes and substitutions made by those skilled in the art within the scope of the technical solution of the present invention are all included in the protection scope of the present invention.

Claims

1. A gate valve, comprising a valve body, a gate, and a driving mechanism, wherein the valve body comprises a valve cavity, the gate is movably arranged in the valve cavity, the gate is connected to the driving mechanism, the gate comprises a flow hole, valve holes are arranged on both sides of the valve body, a valve seat is arranged at the inner end of the valve hole, the valve seat is provided with a sealing ring assembly, the sealing ring assembly comprises a sealing ring and multiple springs, the valve seat comprises an annular mounting groove, the radial inner side of the mounting groove and an axial end corresponding to the gate are both provided with openings, an annular gap is left between the axial end of the mounting groove and the gate, the sealing ring is embedded in the mounting groove and contacts and seals with the gate, and is characterized in that: The other axial end of the mounting groove is evenly distributed along the axial direction with multiple mounting holes for mounting springs. The sealing ring assembly also includes a rigid gasket, which is embedded in the mounting groove. One axial end of the gasket abuts against the sealing ring, and the other axial end of the gasket abuts against multiple springs.

2. The gate valve according to claim 1, characterized in that: The mounting hole is provided with a communication port on the inner peripheral wall of the valve seat. The width of the communication port along the circumference of the valve seat is smaller than the diameter of the spring. The mounting hole is connected to the valve hole through the communication port.

3. The gate valve according to claim 2, characterized in that: One end of the communication port extends to the other axial end surface of the mounting groove, and the other axial end of the gasket is evenly distributed along the circumferential direction with a plurality of convex walls, and the plurality of convex walls are correspondingly embedded in the plurality of communication ports.

4. The gate valve according to claim 2, characterized in that: A flat cavity is formed between the other axial end surface of the mounting groove and the other axial end surface of the washer.

5. The gate valve according to claim 1, characterized in that: A sealing ring is provided between the outer peripheral wall of the sealing ring and the inner peripheral wall of the mounting groove.

6. The gate valve according to claim 1 or 2, characterized in that: The inner peripheral wall of the mounting groove is tapered, and its diameter gradually increases toward the gate plate. The outer peripheral walls of the sealing ring and the gasket are both tapered.

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