Composite ball valve seat

Abstract

The utility model belongs to the technical field of valve manufacturing, and particularly relates to a composite ball valve seat which comprises a valve seat body. The valve cover is arranged in the length direction of the valve seat body, the bolt is fixedly arranged between the valve seat body and the valve cover, the valve body is rotatably arranged between the valve seat body and the valve cover, and an annular groove for providing a space for rotation of the valve body is formed between the valve seat body and the valve cover; the soft sealing ring is nested along the annular surface of the valve ball and is coaxially nested with the elastic turnup check ring, and the elastic turnup check ring axially extends to form an integrally formed bevel turnup part corresponding to the valve body. The metal ball is simple in structure, the dynamic compensation capacity of sealing specific pressure is enhanced through the elastic flanging structure, the check ring is used for physically isolating medium scouring and restraining deformation of the sealing ring, metal ball emergency sealing is formed under the fire working condition, and people can use the metal ball conveniently.

Description

Technical Field

[0001] This utility model relates to the field of valve manufacturing technology, and in particular to a composite ball valve seat. Background Technology

[0002] Soft-seal floating ball valves, as a traditional double-seal valve, have been widely used for a long time due to their superior sealing performance. Traditional soft-seal floating ball valves use double soft-seal valve seats (such as PTFE, PPL, etc.) to form a sealing pair with a metal ball. Figure 1 This system forms a seal, and the opening or closing of the pipeline is achieved by rotating a ball with a flow channel. Its sealing performance relies on the elasticity of the soft sealing material itself to generate a sealing pressure, and it has the following technical drawbacks:

[0003] 1. Elasticity degradation: Under long-term pressure or high temperature conditions, soft materials are prone to plastic deformation or elastic degradation, resulting in a decrease in sealing specific pressure;

[0004] 2. Abrasive wear: High-speed scouring by particulate media directly acts on the sealing surface, accelerating the wear of the sealing ring;

[0005] 3. Risk of thermal failure: High temperatures can cause the sealing ring to soften or carbonize, making it prone to elliptical deformation and tearing during switching operations;

[0006] 4. Fireproof defects: There is no emergency sealing mechanism after the soft seal is completely burned in the event of a fire.

[0007] In existing technologies, spring compensation or metal auxiliary structures are often added, but these methods suffer from structural complexity and dynamic sealing interference. Therefore, there is a need for an integrated valve seat structure that combines elastic compensation, erosion protection, and fire resistance to further improve the performance and service life of soft-seal ball valves and broaden their application range. Utility Model Content

[0008] The purpose of this invention is to address the shortcomings of existing technologies, which often rely on adding spring compensation or metal auxiliary structures, resulting in structural complexity and dynamic sealing interference. This invention proposes a composite ball valve seat.

[0009] To achieve the above objectives, the present invention adopts the following technical solution:

[0010] A composite ball valve seat, comprising:

[0011] Valve seat body;

[0012] A valve cover is provided along the length of the valve seat body, a bolt is fixed between the valve seat body and the valve cover, and a valve body is rotatably provided between the valve seat body and the valve cover. An annular groove is formed between the valve seat body and the valve cover to provide space for the valve body to rotate.

[0013] The flexible flange retaining ring is nested along the annular surface of the valve ball and a soft sealing ring is nested coaxially with the flexible flange retaining ring. The flexible flange retaining ring corresponds to the integrally formed folded flange portion extending axially from the valve body. The flexible flange retaining ring can isolate more than 90% of the medium from directly impacting the soft sealing ring, creating conditions for the application of soft sealing ball valves in working conditions such as high pressure difference and high flow rate, solid-liquid two-phase flow, and gas-solid two-phase flow.

[0014] Furthermore, the folded edge portion has a butterfly spring-like structure and extends outward by 3~5mm corresponding to the diameter of the valve body.

[0015] Furthermore, the inner wall of the soft sealing ring is provided with an annular groove and is embedded in the outer circle of the valve body to form an interference fit. The soft sealing ring is made of polytetrafluoroethylene or carbon fiber reinforced PTFE composite material.

[0016] Furthermore, the elastic flange retaining ring is made of corrosion-resistant and highly elastic stainless steel.

[0017] Furthermore, the free end of the valve body forms a metal-to-metal contact seal with the surface of the ball.

[0018] Compared with the prior art, the advantages of this utility model are:

[0019] 1. The elastic enhancement effect of this solution: the elastic flange structure of the elastic flange retaining ring provides additional elastic compensation, which can offset 20-40% of the elastic decay of soft materials, thereby improving the sealing performance and service life of the ball valve.

[0020] 2. This solution provides anti-erosion protection. The elastic flanged retaining ring body isolates more than 90% of the medium from direct impact on the soft sealing ring, creating conditions for the application of soft sealing ball valves in working conditions such as high pressure difference and high flow rate, solid-liquid two-phase flow, and gas-solid two-phase flow.

[0021] 3. This solution features dynamic deformation suppression. The elastic flange retaining ring body mechanically constrains the soft sealing ring to prevent axial deformation caused by the friction and rotation of the ball, including but not limited to elliptical deformation, tearing, and breakage. It is especially suitable for fast-acting pneumatic soft-seal ball valves, etc.

[0022] 4. This solution features a fire-resistant redundancy design, which ensures that when a fire causes the soft sealing ring to be burned or damaged, the elastic flange retaining ring loses its forced compression force and quickly rebounds through the folded flange, pushing the free end of the annular body to form an emergency metal hard seal structure between the ring and the ball, effectively preventing the spread of flames in the pipeline. This structure meets the API 607 / ISO10497 fire-resistant structure and testing standards. Attached Figure Description

[0023] To more clearly illustrate the technical solutions in the embodiments of this utility model, the drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0024] Figure 1 This is a schematic diagram of the structure of a composite ball valve seat proposed in this utility model;

[0025] Figure 2 This utility model proposes a composite ball valve seat. Figure 1 Enlarged diagram of part A in the diagram;

[0026] Figure 3 This is a schematic diagram of the structure of the elastic flange retaining ring, the angled flange portion, and the soft sealing ring of the composite ball valve seat proposed in this utility model.

[0027] The correspondence between the numbers in the attached diagram is as follows:

[0028] 1. Flexible flange retaining ring; 101. Folded flange part; 2. Soft sealing ring; 3. Valve seat body; 4. Valve cover; 5. Bolt. Detailed Implementation

[0029] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0030] Reference Figures 1-3 A composite ball valve seat, comprising:

[0031] Valve seat body 3;

[0032] The valve cover 4 is arranged along the length of the valve seat body 3, the bolt 5 is fixed between the valve seat body 3 and the valve cover 4, and the valve body is rotatably arranged between the valve seat body 3 and the valve cover 4. An annular groove is formed between the valve seat body 3 and the valve cover 4 to provide space for the valve body to rotate.

[0033] The elastic flange retaining ring 1 is nested along the annular surface of the valve ball and the soft sealing ring 2 is nested coaxially with the elastic flange retaining ring 1. The elastic flange retaining ring 1 corresponds to the integrally formed folded flange portion 101 extending axially from the valve body. When the elastic flange retaining ring 1 loses the forced compression force, it can quickly rebound through the folded flange portion, pushing the free end of the annular body portion to form an emergency metal hard seal structure between the ball, thereby effectively preventing the spread of flame in the pipeline.

[0034] In this application, the bend and flange portion 101 has a butterfly spring-like structure and extends outward at a height of 3~5mm corresponding to the valve body diameter.

[0035] In this application, the inner wall of the soft sealing ring 2 is provided with an annular groove and is embedded in the outer circle of the valve body to form an interference fit, and the soft sealing ring 2 produces a butterfly spring-like effect.

[0036] In this application, the elastic flange retaining ring 1 is made of corrosion-resistant and highly elastic stainless steel. The stainless steel material of the elastic flange retaining ring 1 is subjected to aging treatment or special folding technology after stamping and forming, and has a high elastic modulus.

[0037] In this application, the free end of the valve body forms a metal-to-metal contact seal with the surface of the ball.

[0038] The implementation principle of a composite ball valve seat in this application embodiment is as follows: a soft sealing ring 2 is embedded in an elastic flanged retaining ring 1 to form a composite valve seat. The two composite valve seats are respectively pressed into the annular grooves of the valve body and the valve cover 4. The ball valve is located at the center of the two composite valve seats. When the valve body and the valve cover 4 are tightly connected by bolts 5 and nuts, the composite valve seats on both sides apply static sealing pressure to the ball through the folded flange of the elastic flanged retaining ring 1 and the soft sealing ring 2. The annular body of the elastic flanged retaining ring 1 covers the outside of the soft sealing ring 2, forming an anti-erosion barrier. The elastic flanged retaining ring 1 is made of high-quality materials such as stainless steel or nickel-based alloy. After stamping and forming, it is aged or processed by special folding technology. It has a high elastic modulus. The free height of the flanged flange is 3~5mm. After assembly, the free height is forcibly compressed to 0.5-2.0mm, so that the soft sealing ring 2 generates a butterfly spring-like effect. The soft sealing ring 2 is made of polytetrafluoroethylene or carbon fiber reinforced PTFE composite material, etc.

[0039] All structures in this application can be customized in terms of material and length according to actual usage. The attached drawings are schematic structural diagrams, and the actual dimensions can be adjusted accordingly.

[0040] The above description is only a preferred embodiment of this practice, but the scope of protection of this embodiment is not limited thereto. Any equivalent substitutions or changes made by those skilled in the art within the scope of the technology disclosed in this embodiment, based on the technical solution and the inventive concept of this embodiment, should be covered within the scope of protection of this embodiment.

Claims

1. A composite ball valve seat, characterized in that, include: Valve seat body; A valve cover is provided along the length of the valve seat body, a bolt is fixed between the valve seat body and the valve cover, and a valve body is rotatably provided between the valve seat body and the valve cover. An annular groove is formed between the valve seat body and the valve cover to provide space for the valve body to rotate. An elastic flange retaining ring, a soft sealing ring nested along the annular surface of the valve ball and coaxially nested with the elastic flange retaining ring, the elastic flange retaining ring corresponding to the integrally formed folded flange portion extending axially from the valve body.

2. The composite ball valve seat according to claim 1, characterized in that, The folded edge has a butterfly spring-like structure and extends outward by 3~5mm corresponding to the diameter of the valve body.

3. The composite ball valve seat according to claim 1, characterized in that, The inner wall of the soft sealing ring has an annular groove and is embedded in the outer circle of the valve body to form an interference fit.

4. A composite ball valve seat according to claim 1, characterized in that, The elastic flange retaining ring is made of corrosion-resistant and highly elastic stainless steel.

5. A composite ball valve seat according to claim 1, characterized in that, The free end of the valve body forms a metal-to-metal contact seal with the surface of the ball.

Images