A valve seat hard seal structure

Abstract

This utility model relates to a valve seat hard seal structure, comprising a ball, a valve seat, and a valve body connected in sequence. A pre-compression assembly is provided between the valve seat and the valve body. The pre-compression assembly includes a support ring and a pre-compression member disposed between the support ring and the valve body. The valve seat is stepped, including a first stepped portion, a second stepped portion, and a protrusion on the end face of the second stepped portion near the valve body, wherein the protrusion is embedded in a groove on the support ring and a sealing ring is fitted on the unembedded portion. This utility model provides a valve seat hard seal structure in which the pre-compression assembly can provide continuous pre-tightening force, which can compensate for gaps caused by temperature changes, pressure fluctuations, or component wear, ensuring that the valve seat and the ball are always tightly fitted and maintaining a stable seal.

Description

Technical Field

[0001] This utility model relates to a valve seat hard seal structure, specifically a valve seat hard seal 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 a floating seat. Under medium pressure, the seat moves, causing the sealing ring to press 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 overcome at least one of the defects of the prior art and provide a valve seat hard seal structure.

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

[0006] A valve seat hard seal structure includes a ball, a valve seat, and a valve body connected in sequence. A pre-compression assembly is provided between the valve seat and the valve body. The pre-compression assembly includes a support ring and a pre-compression member disposed between the support ring and the valve body.

[0007] The valve seat is stepped, including a first stepped portion, a second stepped portion, and a protrusion on the end face of the second stepped portion near the valve body, which are connected in sequence. The protrusion is embedded in a groove on the support ring and the unembedded portion is fitted with a sealing ring.

[0008] 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.

[0009] Furthermore, the preload component is a spring.

[0010] Furthermore, the first stepped portion is embedded in the groove formed by the sphere and the valve body.

[0011] Furthermore, a gasket is provided at the part of the first stepped portion that contacts the sphere.

[0012] Furthermore, a gasket is provided on the portion of the first stepped section that contacts the valve body.

[0013] Furthermore, a gasket is provided between the end face of the protrusion embedded in the groove on the support ring and the support ring.

[0014] Furthermore, the gasket is a polytetrafluoroethylene gasket.

[0015] Furthermore, the outer wall of the protrusion and the inner wall of the groove on the support ring are interference fit.

[0016] Furthermore, the valve body includes an inlet valve body and an outlet valve body, which together form a valve cavity; the valve hard seal structure is respectively disposed at the inlet and outlet of the valve cavity.

[0017] Compared with the prior art, the present invention has the following advantages:

[0018] (1) This utility model provides a valve seat hard seal structure. The pre-pressure component in the valve seat hard seal structure can provide continuous pre-tightening force, which can compensate for the gap caused by temperature changes, pressure fluctuations or wear of parts, and ensure that the valve seat and the ball are always tightly fitted and maintain a stable seal.

[0019] (2) This utility model provides a valve seat hard seal structure. The valve seat protrusion and the support ring groove in the valve seat hard seal structure are interference fit together. Combined with the sealing ring of the unembedded part of the protrusion, a multi-seal structure is formed, which effectively prevents the medium from leaking from between the valve seat and the support ring.

[0020] (3) This utility model provides a valve seat hard seal structure. The valve seat in the valve seat hard seal structure adopts a stepped design. The first step is embedded in the groove formed by the ball and the valve body, which can effectively limit the radial and axial displacement of the valve seat, ensure the accurate alignment of the sealing surface, and avoid sealing failure caused by misalignment. At the same time, the cooperation between the support ring and the pre-compression component, as well as the guiding and positioning of the pre-compression component by the valve body placement hole, ensure that the pre-compression component is subjected to uniform force and works stably, avoid the pre-compression component offset from affecting the pre-tightening effect, and improve the stability of the overall structure. Attached Figure Description

[0021] Figure 1 This is a schematic diagram of a ball valve with a hard seal structure on the valve seat, as shown in the embodiment.

[0022] Figure 2 for Figure 1 A schematic diagram of region A in the middle;

[0023] The numbers in the diagram indicate: 1-ball; 2-valve seat; 21-first step; 22-second step; 23-protrusion; 3-support ring; 4-sealing ring; 5-pre-compression component; 6-valve body. Detailed Implementation

[0024] 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.

[0025] Example

[0026] This embodiment provides a valve seat hard seal structure, the specific structure of which is shown in [link to specific structure]. Figure 1-2 It includes a ball 1, a valve seat 2 and a valve body 6 connected in sequence. A pre-compression assembly is provided between the valve seat 2 and the valve body 6. The pre-compression assembly includes a support ring 3 and a pre-compression member 5 disposed between the support ring 3 and the valve body 6.

[0027] The valve seat 2 is stepped, including a first stepped portion 21, a second stepped portion 22, and a protrusion 23 on the end face of the second stepped portion 22 near the valve body 6, which are connected in sequence. The protrusion 23 is partially embedded in the groove on the support ring 3 and the unembedded portion is fitted with a sealing ring 4.

[0028] The pre-compression component provides continuous pre-tightening force, which can compensate for gaps caused by temperature changes, pressure fluctuations, or wear of parts, ensuring that the valve seat 2 and the ball 1 are always tightly fitted and maintain a stable seal.

[0029] In this embodiment, 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; wherein, the pre-compression member 5 is a spring.

[0030] In this embodiment, the first stepped portion 21 is embedded in the groove formed by the ball 1 and the valve body 6.

[0031] In this embodiment, a gasket is provided at the portion of the first stepped portion 21 that contacts the sphere 1. Preferably, the gasket is a polytetrafluoroethylene gasket.

[0032] In this embodiment, a gasket is provided at the portion of the first stepped portion 21 that contacts the valve body 6. Preferably, the gasket is a polytetrafluoroethylene gasket.

[0033] In this embodiment, a gasket is provided between the end face of the protrusion 23 embedded in the groove on the support ring 3 and the support ring 3. Preferably, the gasket is a polytetrafluoroethylene gasket.

[0034] In this embodiment, the outer wall of the protrusion 23 and the inner wall of the groove on the support ring 3 are interference fit, and together with the sealing ring 4 of the unembedded part of the protrusion, a multi-seal structure is formed, which effectively prevents the medium from leaking between the valve seat 2 and the support ring 3.

[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 hard seal structure is respectively disposed at the inlet and outlet of the valve cavity.

[0036] Working principle:

[0037] The pre-compression component 5 in the pre-compression assembly is installed in the placement hole of the valve body 6. Its elasticity is transmitted to the second stepped portion 22 of the valve seat 2 through the support ring 3, ensuring that the first stepped portion 21 of the valve seat 2 is always in close contact with the surface of the ball 1, forming an initial sealing surface. In the stepped valve seat design, the first stepped portion 21 is embedded in the groove formed by the ball 1 and the valve body 6, which not only restricts the radial displacement of the valve seat 6 but also ensures precise contact of the sealing surface. The second stepped portion 22, through the support ring 3, bears the continuous pressure of the pre-compression component 5, compensating for gaps caused by the rotation of the ball 1, wear of parts, or temperature changes, and maintaining a stable sealing force. At the same time, the protrusion of the valve seat 2 is embedded in the groove of the support ring 3, and the two adopt an interference fit, which, together with the sealing ring 4 on the outer wall of the protrusion 23, forms a secondary seal to prevent the medium from leaking from the gap between the valve seat 2 and the support ring 3. Meanwhile, the gaskets on the contact surfaces of the protrusion 23 and the support ring 3, and the gaskets on the contact surfaces of the valve seat and the ball and valve body, further enhance the sealing effect and prevent medium penetration.

[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 hard seal structure, comprising a ball (1), a valve seat (2), and a valve body (6) connected in sequence, characterized in that, A pre-compression assembly is provided between the valve seat (2) and the valve body (6). The pre-compression assembly includes a support ring (3) and a pre-compression member (5) disposed between the support ring (3) and the valve body (6). The valve seat (2) is stepped, including a first stepped part (21), a second stepped part (22) connected in sequence, and a protrusion (23) on the end face of the second stepped part (22) near the valve body (6). The protrusion (23) is partially embedded in the groove on the support ring (3) and the unembedded part is fitted with a sealing ring (4).

2. A hard seat valve seat structure according to claim 1, 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.

3. A hard seat valve seat structure according to claim 1 wherein, The preload component (5) is a spring.

4. A hard seat valve seat structure according to claim 1 wherein, The first stepped portion (21) is embedded in the groove formed by the ball (1) and the valve body (6).

5. A hard seat valve seat structure according to claim 4, wherein The portion of the first stepped part (21) that contacts the sphere (1) is provided with a gasket.

6. A hard seat valve seat structure according to claim 4, wherein The portion of the first stepped section (21) that contacts the valve body (6) is provided with a gasket.

7. A hard seat valve seat structure according to claim 1 wherein, A gasket is provided between the end face of the protrusion (23) embedded in the groove on the support ring (3) and the support ring (3).

8. A hard seat valve seat structure according to claim 5, 6 or 7, wherein The gasket is a polytetrafluoroethylene gasket.

9. The hard seat valve seat structure of claim 1 wherein, The outer wall of the protrusion (23) and the inner wall of the groove on the support ring (3) are interference fit.

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