A valve seat sealing structure

Abstract

This utility model relates to a valve seat sealing structure, comprising a ball (1), a valve seat (2), and a valve body (6) connected in sequence, and further comprising: a first sealing assembly disposed between the valve seat (2) and the valve body (6); and a first pre-pressure assembly disposed between the end of the valve seat (2) on the side opposite to the valve seat (2) and the valve body (6). This utility model, through a multi-seal design of the first sealing assembly, the second sealing assembly, the second graphite packing, and the ball-seat gasket, can significantly enhance the sealing effect, effectively prevent media leakage, and improve the sealing reliability of the valve.

Description

Technical Field

[0001] This utility model relates to a valve seat sealing structure, specifically a valve seat sealing structure. Background Technology

[0002] A ball valve is a type of valve that controls fluid flow by rotating a ball. A ball valve typically uses a ball as the closing element inside the valve body, and the ball has a circular orifice. When the orifice is aligned with the pipe axis, the valve is in the open state; when the ball rotates so that the orifice is perpendicular to the pipe axis, the valve is in the closed state.

[0003] Ball valves can be classified into three types according to their structure: floating ball valves, fixed ball valves, and resilient ball valves. Among them, the ball in a fixed ball valve is stationary and does not move under pressure. It can withstand the erosion of the medium during opening and closing, and is therefore widely used in applications involving stationary particles and abrasive media. Existing fixed ball valves all have floating seats. Under medium pressure, the seat moves, pressing the sealing ring tightly against the ball to ensure a seal. However, relying solely on medium pressure is insufficient to reliably guarantee the reliability and effectiveness of the seal, especially in low-pressure operating environments, which directly affects the reliability and stability of the ball valve's operation. Utility Model Content

[0004] The purpose of this utility model is to provide a valve seat sealing structure to overcome at least one of the defects of the prior art.

[0005] The objective of this utility model can be achieved through the following technical solutions:

[0006] A valve seat sealing structure includes a ball, a valve seat, and a valve body connected in sequence, and further includes:

[0007] A first sealing assembly is disposed between the valve seat and the valve body;

[0008] The first pre-pressure assembly is disposed between the end of the valve seat on the side opposite to the valve seat and the valve body.

[0009] Furthermore, a second sealing assembly is provided between the valve seat and the first pre-compression assembly.

[0010] Furthermore, the second sealing assembly includes a sealing ring fitted onto the valve seat.

[0011] Furthermore, the first sealing assembly includes a first graphite packing disposed on the valve seat.

[0012] Furthermore, the first pre-compression assembly includes a support ring and a plurality of pre-compression members disposed between the support ring and the valve body.

[0013] Furthermore, a second graphite packing is provided between the support ring and the valve body.

[0014] Furthermore, the preload component is a spring.

[0015] Furthermore, a placement hole is provided on the side of the valve body near the support ring, and the pre-compression member is located in the placement hole.

[0016] Furthermore, a gasket is provided at the point where the ball and the valve seat meet.

[0017] Furthermore, the valve body includes an inlet valve body and an outlet valve body, which together form a valve cavity; the valve seat sealing structure is respectively disposed at the inlet and outlet of the valve cavity.

[0018] Compared with the prior art, the present invention has the following advantages:

[0019] (1) This utility model provides a valve seat sealing structure. The structure can significantly enhance the sealing effect, effectively prevent medium leakage, and improve the sealing reliability of the valve through the multiple sealing design of the first sealing component, the second sealing component, the second graphite packing and the ball-seat gasket.

[0020] (2) This utility model provides a valve seat sealing structure. The first pre-pressure component in the structure can provide continuous pre-tightening force, which can compensate for the deformation and gap of the valve seat and seal caused by temperature fluctuation, pressure change or long-term wear, and ensure that the seal is always tightly fitted and maintains stable sealing performance. It is especially suitable for complex working conditions.

[0021] (2) This utility model provides a valve seat sealing structure. The pre-compression component in the structure is placed in the valve body placement hole. With the support ring design, the pre-tightening force can be evenly transmitted to the valve seat, avoiding sealing failure caused by uneven local force. At the same time, the modular component design facilitates installation, maintenance and replacement, improving the practicality of the valve. Attached Figure Description

[0022] Figure 1 This is a schematic diagram of the ball valve with a valve seat sealing structure in the embodiment;

[0023] Figure 2 for Figure 1 A magnified view of a portion of region A in the middle;

[0024] The numbers in the diagram indicate: 1-ball; 2-valve seat; 3-support ring; 4-sealing ring; 5-spring; 6-valve body; 7-first graphite packing. Detailed Implementation

[0025] The present invention will now be described in detail with reference to the accompanying drawings and specific embodiments. These embodiments are implemented based on the technical solution of the present invention, providing detailed implementation methods and specific operating procedures. However, the scope of protection of the present invention is not limited to the following embodiments.

[0026] Example

[0027] This embodiment provides a valve seat sealing structure, the specific structure of which is shown below. Figure 1-2 It includes a ball 1, a valve seat 2 and a valve body 6 connected in sequence, and also includes a first sealing assembly and a first pre-pressure assembly;

[0028] The first sealing assembly is disposed between the valve seat 2 and the valve body 6; the first pre-pressure assembly is disposed between the end of the valve seat 2 facing away from the valve seat 2 and the valve body 6.

[0029] In this embodiment, a second sealing assembly is further provided between the valve seat 2 and the first pre-compression assembly. The second sealing assembly includes a sealing ring 4 sleeved on the valve seat 2. Specifically, there is a gap between the first pre-compression assembly and the valve seat 2. The second sealing assembly can block the possibility of medium leakage from this gap, forming a multi-layer sealing structure with the first sealing assembly, thereby improving the overall sealing reliability.

[0030] In this embodiment, the first sealing assembly includes a first graphite packing 7 sleeved on the valve seat 2.

[0031] In this embodiment, the first pre-compression assembly includes a support ring 3 and a plurality of pre-compression members 5 disposed between the support ring 3 and the valve body 6; a second graphite packing is also provided between the support ring 3 and the valve body 6; the pre-compression member 5 is a spring. Specifically, the spring provides continuous pre-compression force, which is transmitted to the valve seat 2 through the support ring 3 to ensure that the valve seat 2 is always in close contact with the ball 1. The function of the support ring 3 is to evenly distribute the pre-compression force of the spring and avoid uneven force on the valve seat.

[0032] The second graphite packing further seals the gap between the support ring and the valve body, preventing the medium from leaking from the pre-compression assembly side and ensuring that the pre-compression assembly itself does not become a leak point.

[0033] In this embodiment, the valve body 6 has a placement hole on the side near the support ring 3, and the pre-compression component 5 is located in the placement hole. The placement hole provides a stable installation space for the spring, ensuring that the spring is subjected to force in an accurate direction, avoiding spring deviation that could lead to pre-compression failure, and ensuring the stability of the pre-compression component.

[0034] In this embodiment, a gasket is provided at the point where the ball 1 and the valve seat 2 abut. The gasket can fill the tiny gap between them, such as unevenness caused by processing errors, and further block the path of medium leakage from the contact surface, thereby improving the reliability of the seal.

[0035] In this embodiment, the valve body 6 includes an inlet valve body and an outlet valve body, which together form a valve cavity; the valve seat sealing structure is respectively disposed at the inlet and outlet of the valve cavity.

[0036] Working principle:

[0037] In this embodiment, the ball 1, valve seat 2 and valve body 6 of the ball valve are connected in sequence. The valve body 6 is formed by the inlet valve body and the outlet valve body. The valve seat sealing structure is respectively set at the inlet and outlet of the valve cavity, which can provide double sealing protection for the inlet and outlet of the valve cavity. The first pre-compression assembly plays a pre-tightening role. Its pre-compression component 5 is installed in the placement hole on the side of the valve body 6 near the support ring 3, applying pre-pressure to the support ring 3. The support ring 3 transmits this force to the valve seat 2, causing the valve seat 2 to press tightly towards the ball 1. At the same time, the gasket at the abutment of the ball 1 and the valve seat 2 enhances the initial sealing effect between the two, ensuring that the valve seat 2 and the ball 1 fit tightly. Meanwhile, the first graphite packing 7 fitted on the valve seat 2 constitutes the first sealing assembly, which can effectively prevent the medium from leaking from the gap between the valve seat 2 and the valve body 6. The sealing ring 4 fitted between the valve seat 2 and the first pre-compression assembly constitutes the second sealing assembly, which can prevent the medium from leaking between the valve seat 2 and the support ring 3. In addition, the second graphite packing between the support ring 3 and the valve body 6 further enhances the sealing performance. The multiple sealing assemblies and the pre-compression assembly work together to achieve reliable sealing of the valve.

[0038] The above description is merely a preferred embodiment of this utility model and is not intended to limit the utility model in any other way. Any person skilled in the art may make changes or modifications to the above-disclosed technical content to create equivalent embodiments. However, any simple modifications, equivalent changes, and modifications made to the above embodiments based on the technical essence of this utility model without departing from its technical solution shall still fall within the protection scope of this utility model.

Claims

1. A valve seat sealing structure comprising, in succession, a ball (1), a valve seat (2) and a valve body (6), characterized in that, Also includes: A first sealing assembly is disposed between the valve seat (2) and the valve body (6); The first pre-pressure assembly is located between the end of the valve seat (2) on the side away from the valve seat (2) and the valve body (6); The first sealing assembly includes a first graphite packing (7) fitted onto the valve seat (2).

2. A valve seat sealing structure according to claim 1, wherein A second sealing component is also provided between the valve seat (2) and the first pre-pressure component.

3. A valve seat sealing structure according to claim 2, wherein The second sealing assembly includes a sealing ring (4) fitted onto the valve seat (2).

4. The valve seat sealing structure of claim 1, wherein The first pre-compression assembly includes a support ring (3) and a plurality of pre-compression members (5) disposed between the support ring (3) and the valve body (6).

5. A valve seat sealing structure according to claim 4, wherein A second graphite packing is also provided between the support ring (3) and the valve body (6).

6. A valve seat sealing structure according to claim 4, wherein The preload component (5) is a spring.

7. A valve seat sealing structure according to claim 4, wherein The valve body (6) has a placement hole on the side near the support ring (3), and the pre-compression member (5) is located in the placement hole.

8. The valve seat sealing structure of claim 1, wherein A gasket is provided at the point where the ball (1) and the valve seat (2) meet.

9. The valve seat sealing structure of claim 1, wherein The valve body (6) includes an inlet valve body and an outlet valve body, which together form a valve cavity; the valve seat sealing structure is respectively disposed at the inlet and outlet of the valve cavity.

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