Valve seat sealing structure of flat gate valve

Abstract

The flat gate valve seat sealing structure comprises a valve body, a valve plate, a valve rod and a valve seat, a transversely-through flow channel is formed in the valve body, the vertically-arranged valve rod is installed in the middle of the valve body, the valve plate is fixedly installed at the lower end of the valve rod, the valve rod drives the valve plate to move up and down, and the valve plate can block or open the flow channel in the valve body; valve seats are installed in the valve body on the two transverse sides of the valve plate, the valve seats on the two sides can abut against the end faces of the two transverse sides of the valve plate respectively, the valve plate comprises a fixed plate, sliding plates and a pipeline, a cavity is formed in the lower portion of the fixed plate, the sliding plates are installed at the two transverse ends of the cavity in a limiting mode respectively, and the size of the sliding plates is matched with the hard sealing size of the valve seats; the sliding plate is in sealed sliding connection with the fixed plate, and the fixed plate is provided with a clamping groove so that the sliding plate can slide within a set range; and the cavity is communicated with an external hydraulic pump through a pipeline in the fixed plate. The sealing performance of the valve plate and the valve seat can be effectively improved, friction resistance in the opening and closing process is small, and the service life of a product is prolonged.

Description

Technical Field

[0001] The present application belongs to the field of valves and relates to a flat plate valve, specifically a flat plate gate valve seat sealing structure. Background Art

[0002] Flat plate valves are widely used in petroleum, petrochemical oil and gas pipelines, as well as in production and life, as opening and closing equipment. When closed, the valve plate of the flat plate valve abuts against the valve seat for sealing. In order to ensure the sealing effect, it is necessary to ensure close contact between the valve seat and the valve plate. However, after long-term use, the contact surface wears, which will cause the valve seat sealing performance to decline, affecting the service life of the valve. In addition, the close-fitting valve plate and valve seat also cause large relative movement resistance. Summary of the invention

[0003] In order to overcome the deficiencies of the prior art, the present application proposes a valve seat sealing structure for a flat gate valve.

[0004] The present application solves the technical problem by adopting the following technical solutions:

[0005] A flat gate valve seat sealing structure comprises a valve body, a valve plate, a valve stem and a valve seat. A transverse through-flow channel is arranged in the valve body. A vertically arranged valve stem is installed in the middle of the valve body. A valve plate is fixedly mounted at the lower end of the valve stem. The valve stem drives the valve plate to move up and down. The valve plate can block or open the flow channel in the valve body. Valve seats are installed in the valve body on both lateral sides of the valve plate. The valve seats on both sides can respectively abut against the lateral side end surfaces of the valve plate. The valve plate comprises a fixed plate, a sliding plate and a pipeline. A cavity is arranged at the lower part of the fixed plate. Sliding plates are respectively installed at the lateral ends of the cavity. The size of the sliding plate matches the hard sealing size of the valve seat. The sliding plate is sealingly and slidingly connected with the fixed plate. The fixed plate is provided with a slot to enable the sliding plate to slide within a set range. The cavity is connected to an external hydraulic pump through a pipeline in the fixed plate.

[0006] Moreover, the valve seat includes a seat body, a spring, a hard seal, and a sealing ring. A flow is arranged inside the valve seat, and a spring abuts against the seat body and the valve body on the side of the seat body away from the valve plate. The spring maintains a preload force to make the valve seat close to the valve plate. An annular hard seal is formed on the inner edge of the seat body on the side close to the valve plate. The hard seal has good wear resistance and ensures the reliability of sealing contact. A circle of sealing rings is embedded in the seat body on the outer periphery of the hard seal to further enhance the sealing effect.

[0007] Furthermore, a plurality of O-rings are arranged between the valve seat and the valve body.

[0008] Moreover, a rubber sleeve is fixedly mounted on the inner wall of the flow channel in the valve seat, and the transverse end surface of the rubber sleeve exceeds the valve seat, and the rubber sleeve is deformed when it abuts against the valve plate.

[0009] Moreover, the upper end of the valve stem extends outside the valve body to engage with a driver or a hand wheel to control the valve stem to move up and down.

[0010] The advantages and positive effects of the utility model are:

[0011] This structure can effectively improve the sealing performance between the valve plate and the valve seat, reduce the friction resistance during the opening and closing process, and increase the product life. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 It is a schematic diagram of the overall structure of this application.

[0013] Figure 2 yes Figure 1 Enlarged schematic diagram of part A in the middle.

[0014] Figure 3 yes Figure 2 Schematic diagram of another working state structure.

[0015] Figure Number:

[0016] 1. Valve stem; 2. Valve plate; 201. Fixed plate; 202. Pipe; 203. Sliding plate; 3. Valve body; 4. Valve seat; 401. Seat body; 402. Sealing ring; 403. Hard seal; 404. Spring; 5. Rubber sleeve; DETAILED DESCRIPTION

[0017] In order to make the purpose, technical solutions and advantages of this application clearer and easier to understand, the present application is further described below in conjunction with the accompanying drawings and specific implementation methods. It should be understood that the specific embodiments described herein are only used to explain this application and are not used to limit this application.

[0018] See also Figure 1 A flat gate valve seat sealing structure includes a valve body 3, a valve plate 2, a valve stem 1 and a valve seat 4. A transversely penetrating flow channel is arranged in the valve body 3. A vertically arranged valve stem 1 is installed in the middle of the valve body 3. The valve stem 1 is slidably connected to the valve body 3. The upper end of the valve stem 1 extends to the outside of the valve body 3 to engage with a driver or a hand wheel to control the valve stem 1 to move up and down;

[0019] The valve plate 2 is fixed at the lower end of the valve stem 1, and the valve stem 1 drives the valve plate 2 to move up and down. The valve plate 2 is slidably embedded in the valve body 3, and the valve plate 2 can block or open the flow channel in the valve body 3;

[0020] Valve seats 4 are installed in the valve bodies 3 on both lateral sides of the valve plate 2. The valve seats 4 on both sides can respectively abut against the lateral end surfaces of the valve plate 2 to seal the flow channel.

[0021] See also Figure 2As shown, the valve seat 4 includes a seat body 401, a spring 404, a hard seal 403, and a sealing ring 402. A flow is provided in the valve seat 4 that passes through the valve seat 4. The side of the seat body 401 away from the valve plate 2 abuts against the spring 404 between the seat body 401 and the valve body 3. The spring 404 maintains a pre-tightening force to make the valve seat 4 close to the valve plate 2. An annular hard seal 403 is formed on the inner edge of the side of the seat body 401 close to the valve plate 2. The hard seal 403 has good wear resistance and ensures the reliability of the sealing contact. A circle of sealing ring 402 is embedded in the seat body 401 on the outer periphery of the hard seal 403 to further enhance the sealing effect.

[0022] A plurality of O-rings are arranged between the valve seat 4 and the valve body 3 .

[0023] In order to further improve the sealing effect, a rubber sleeve 5 is fixedly installed on the inner wall of the flow channel in the valve seat 4. The horizontal end surface of the rubber sleeve 5 exceeds the valve seat 4 and can abut the valve plate 2. When the rubber sleeve 5 abuts the valve plate 2, it is squeezed and deformed to improve the sealing effect.

[0024] See also Figure 2 , 3 As shown, the valve plate 2 includes a fixed plate 201, a sliding plate 203 and a pipe 202. A cavity is provided at the lower part of the fixed plate 201, and sliding plates 203 are respectively installed at the lateral ends of the cavity. The size of the sliding plate 203 matches the size of the hard seal 403 of the valve seat 4; the sliding plate 203 is sealed and slidably connected to the fixed plate 201, and the fixed plate 201 is provided with a slot to enable the sliding plate 203 to slide within a set range; the cavity is connected to an external hydraulic pump through a pipe 202 in the fixed plate 201.

[0025] When closing is required, pressurized liquid is injected into the cavity to make the sliding plates on both sides squeeze the valve seat to form an effective seal; when the valve needs to be opened, the pressurized liquid is discharged to make the sliding plates on both sides return to the fixed plate, thereby reducing the friction resistance with the valve seat.

[0026] The above-mentioned embodiments only express several implementation methods of the present application, and the descriptions thereof are relatively specific and detailed, but they cannot be understood as limiting the scope of the present application. It should be pointed out that, for a person of ordinary skill in the art, several variations and improvements can be made without departing from the concept of the present application, and these all belong to the protection scope of the present application. Therefore, the protection scope of the present application shall be subject to the attached claims.

Claims

1. A flat gate valve seat sealing structure, comprising a valve body, a valve plate, a valve stem and a valve seat, wherein a transverse through-flow channel is arranged in the valve body, a vertically arranged valve stem is installed in the middle of the valve body, a valve plate is fixed at the lower end of the valve stem, the valve stem drives the valve plate to move up and down, and the valve plate can block or open the flow channel in the valve body; valve seats are installed in the valve body on both sides of the valve plate, and the valve seats on both sides can respectively abut against the transverse side end faces of the valve plate, and the characteristics are: The valve plate includes a fixed plate, a sliding plate and a pipeline. A cavity is provided at the lower part of the fixed plate. Sliding plates are respectively installed at the two lateral ends of the cavity. The size of the sliding plate matches the hard sealing size of the valve seat. The sliding plate is sealingly and slidingly connected with the fixed plate. The fixed plate is provided with a slot so that the sliding plate can slide within a set range. The cavity is connected to an external hydraulic pump through a pipeline in the fixed plate.

2. A flat gate valve seat sealing structure according to claim 1, characterized in that: The valve seat includes a seat body, a spring, a hard seal, and a sealing ring. A flow passage that passes through the valve seat is arranged inside the valve seat. The side of the seat body away from the valve plate abuts against the spring between the seat body and the valve body. The spring maintains a preload force to make the valve seat close to the valve plate. An annular hard seal is formed on the inner edge of the side of the seat body close to the valve plate. The hard seal is wear-resistant and ensures the reliability of the sealing contact. A circle of sealing rings is embedded in the seat body on the outer periphery of the hard seal to further enhance the sealing effect.

3. A flat gate valve seat sealing structure according to claim 1, characterized in that: A plurality of O-rings are arranged between the valve seat and the valve body.

4. A flat gate valve seat sealing structure according to claim 1, characterized in that: A rubber sleeve is fixedly mounted on the inner wall of the flow channel in the valve seat, and the transverse end surface of the rubber sleeve exceeds the valve seat. When the rubber sleeve abuts against the valve plate, it is deformed.

5. The valve seat sealing structure of a flat gate valve according to claim 1, characterized in that: The upper end of the valve stem extends outside the valve body to engage with a driver or a hand wheel to control the valve stem to move up and down.

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