A high-pressure resistant leak-proof valve seat

Abstract

The utility model discloses a kind of high-pressure resistant leakproof valve valve seat, including valve body and valve seat main body, the valve seat main body is annular structure as a whole, the valve seat main body is formed by inner sealing layer, intermediate buffer layer and outer support layer, the intermediate buffer layer is integrally formed in inner sealing layer outer end, the inner sealing layer uses high hardness and high wear-resistant ceramic material, the intermediate buffer layer is made of high-strength elastic material, the outer support layer is integrally formed in intermediate buffer layer outer end, the outer support layer is made of high-strength metal material, the valve seat main body inner wall is provided with sealing groove, the bottom of sealing groove is provided with drain hole, the sealing groove is filled with high-performance sealing material. The utility model can make valve seat bear higher pressure by the multilayer composite structure of inner sealing layer, intermediate buffer layer and outer support layer, effectively prevent valve seat main body from deforming and rupturing under high pressure environment, ensure the normal operation of valve body.

Description

Technical Field

[0001] This utility model relates to the field of valve technology, specifically to a high-pressure resistant and leak-proof valve seat. Background Technology

[0002] Valves are control components in fluid transport systems, possessing functions such as shut-off, regulation, flow diversion, backflow prevention, pressure stabilization, flow splitting, and pressure relief. Structurally, they typically consist of a valve body, valve cover, valve disc, valve seat, and valve stem. The valve body is the main part of the valve, providing a passage for the fluid; the valve disc cooperates with the valve seat to control the flow of fluid by opening and closing; the valve stem connects the valve disc and the operating mechanism, transmitting the operating force.

[0003] Valves play a crucial role in numerous fields, including industrial production, municipal construction, and daily life. For example, in the petrochemical industry, valves control the flow of various chemical media; in water supply and drainage systems, valves regulate water flow and prevent backflow; and in home heating systems, valves control the circulation of heating water. Different types of valves, such as gate valves, globe valves, and ball valves, are suitable for different working conditions and fluid media due to differences in their structure and working principles.

[0004] However, in practical applications, traditional valve seats exhibit numerous defects under high-pressure environments. On one hand, the powerful impact and squeezing force of high-pressure fluids easily deform the valve seat, preventing a tight seal and leading to leakage. On the other hand, traditional valve seat materials are prone to wear and corrosion under the dual harsh conditions of high pressure and fluid corrosion, further exacerbating leakage risks, shortening valve lifespan, increasing equipment maintenance costs, and creating potential safety hazards. Utility Model Content

[0005] The purpose of this invention is to provide a high-pressure resistant, leak-proof valve seat to address the numerous defects of traditional valve seats exposed under high-pressure environments, as described in the background section. On one hand, the powerful impact and squeezing action of high-pressure fluids easily deforms the valve seat, preventing a tight seal and leading to leakage. On the other hand, traditional valve seat materials are prone to wear and corrosion under the dual harsh conditions of high pressure and fluid corrosion, further exacerbating leakage risks, shortening valve lifespan, increasing equipment maintenance costs, and raising potential safety hazards.

[0006] To achieve the above objectives, this utility model provides the following technical solution: It includes a valve body and a valve seat body. The valve seat body has an overall annular structure and is composed of an inner sealing layer, an intermediate buffer layer, and an outer support layer. The intermediate buffer layer is integrally formed at the outer end of the inner sealing layer. The inner sealing layer is made of a high-hardness and high-wear-resistant ceramic material. The intermediate buffer layer is made of a high-strength elastic material. The outer support layer is integrally formed at the outer end of the intermediate buffer layer and is made of a high-strength metal material. A sealing groove is formed on the inner wall of the valve seat body, and a drainage hole is formed at the bottom of the sealing groove. The sealing groove is filled with a high-performance sealing material.

[0007] Preferably, the valve seat body is fixedly installed inside the flow channel of the valve body.

[0008] Preferably, the inner sealing layer is in contact with the valve disc portion of the valve body for sealing, and the high-hardness and high-wear-resistant ceramic material includes alumina ceramic or silicon carbide ceramic.

[0009] Preferably, the high-strength elastic material includes rubber or polyurethane.

[0010] Preferably, the intermediate buffer layer has multiple honeycomb or spiral cavity structures inside, which increases the deformation space of the intermediate buffer layer through the cavity structures.

[0011] Preferably, the high-strength metal material includes stainless steel or alloy steel, and there are several sealing grooves, which are symmetrically distributed from top to bottom along the inner wall of the valve seat body.

[0012] Preferably, the sealing groove is trapezoidal in shape, and the depth and width of the sealing groove are determined according to the nominal operating pressure of the valve body and the characteristics of the fluid medium.

[0013] Preferably, the high-performance sealing material includes a polytetrafluoroethylene sealing ring or a flexible graphite sealing filler, and the surface of the sealing material is coated with a lubricating and anti-corrosion coating.

[0014] Compared with the prior art, the beneficial effects of this utility model are:

[0015] This invention utilizes a multi-layered composite structure consisting of an inner sealing layer, an intermediate buffer layer, and an outer support layer to enable the valve seat to withstand higher pressures. This effectively prevents deformation and cracking of the valve seat body under high pressure, ensuring the normal operation of the valve body. Simultaneously, the sealing grooves form multiple sealing defenses, significantly improving the sealing effect of the valve seat body. To further optimize sealing performance, high-performance sealing materials filled within the sealing grooves maintain excellent sealing performance under various harsh working conditions, effectively compensating for the gap between the valve seat body and the valve disc to prevent leakage. To improve the sealing performance and service life of the sealing material, a lubricating and anti-corrosion coating reduces friction between the sealing material and the valve disc, lowering wear and improving the corrosion resistance of the sealing material. This, in turn, enhances the high-pressure resistance, leakage prevention effect, and service life of the valve seat body. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the overall structure of a high-pressure resistant and leak-proof valve seat according to the present invention;

[0017] Figure 2 This is a cross-sectional schematic diagram of the overall structure of a high-pressure resistant and leak-proof valve seat according to the present invention;

[0018] Figure 3 This is a partial cross-sectional view of the valve seat structure of a high-pressure resistant and leak-proof valve according to this utility model.

[0019] In the diagram: 1. Valve body; 2. Valve seat body; 201. Inner sealing layer; 202. Intermediate buffer layer; 203. Outer support layer; 204. Sealing groove; 205. Drain hole. Detailed Implementation

[0020] 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.

[0021] Please see Figure 1-3 This utility model provides a high-pressure resistant and leak-proof valve seat technical solution: including a valve body 1 and a valve seat body 2, wherein the valve seat body 2 is fixedly installed in the internal flow channel of the valve body 1. The valve seat body 2 has an overall ring structure. The valve seat body 2 is composed of an inner sealing layer 201, an intermediate buffer layer 202 and an outer support layer 203, so that the inner sealing layer 201, the intermediate buffer layer 202 and the outer support layer 203 cooperate with each other to play the role of high pressure resistance and leak prevention.

[0022] The inner sealing layer 201 contacts and seals with the valve disc of the valve body 1, making the inner sealing layer 201 the main sealing task. The inner sealing layer 201 is made of high-hardness and high-wear-resistant ceramic material, including alumina ceramic or silicon carbide ceramic. The ceramic material has excellent wear resistance and corrosion resistance, and can maintain the flatness and smoothness of the sealing surface for a long time under high pressure, effectively preventing fluid leakage. To further enhance the sealing effect, the inner surface of the inner sealing layer 201 is polished to make its surface roughness extremely low, thereby reducing the possibility of fluid leakage.

[0023] The intermediate buffer layer 202 is integrally formed on the outer end of the inner sealing layer 201. The main function of the intermediate buffer layer 202 is to buffer the impact force of high pressure fluid on the valve seat body 2 and reduce the risk of deformation of the valve seat body 2. The intermediate buffer layer 202 is made of high-strength elastic material, including rubber or polyurethane. Rubber or polyurethane has good elasticity and buffering performance, and can absorb and disperse the energy generated by high pressure fluid, protecting the inner sealing layer 201 from damage. In order to improve the buffering effect and stability of the intermediate buffer layer 202, multiple honeycomb or spiral cavity structures are set inside the intermediate buffer layer 202. The cavity structure can increase the deformation space of the intermediate buffer layer 202, so that it can better absorb energy when subjected to pressure and quickly return to its original shape after the pressure is released.

[0024] The outer support layer 203 is integrally formed on the outer end of the intermediate buffer layer 202. The outer support layer 203 provides sufficient strength and rigidity for the valve seat body 2, ensuring that the valve seat body 2 maintains a stable shape under high pressure. The outer support layer 203 is made of high-strength metal material, including stainless steel or alloy steel. Stainless steel or alloy steel has high strength and hardness and can withstand the pressure of high-pressure fluid, preventing the valve seat body 2 from undergoing overall deformation. This enhances the bonding strength between the outer support layer 203, the intermediate buffer layer 202, and the inner sealing layer 201.

[0025] A sealing groove 204 is formed on the inner wall of the valve seat body 2. Several sealing grooves 204 are symmetrically distributed from top to bottom along the inner wall of the valve seat body 2. The sealing grooves 204 are trapezoidal in shape. When the valve disc of the valve body 1 is partially closed, the fluid pressure forces the sealing material (such as a sealing ring or sealing packing) of the valve disc portion of the valve body 1 to tightly fill the sealing groove 204, forming multiple sealing lines and significantly improving the sealing effect of the valve seat body 2. To further optimize the sealing performance, the depth and width of the sealing groove 204 are determined according to the nominal operating pressure of the valve body 1 and the characteristics of the fluid medium. Simultaneously, a drain hole 205 is formed at the bottom of the sealing groove 204 to prevent gas accumulation within the sealing groove 204. Liquids may affect the sealing effect. The sealing groove 204 is filled with high-performance sealing materials, including polytetrafluoroethylene (PTFE) sealing rings or flexible graphite sealing fillers. PTFE has excellent chemical corrosion resistance and self-lubricating properties, and can maintain good sealing performance under various harsh working conditions. Flexible graphite has high temperature resistance, high pressure resistance and good elasticity, and can effectively compensate for the gap between the valve seat body 2 and the valve disc part of the valve body 1 to prevent leakage. In order to improve the sealing performance and service life of the sealing material, a lubricating and anti-corrosion coating is applied to the surface of the sealing material. The lubricating and anti-corrosion coating can reduce the friction between the sealing material and the valve disc part of the valve body 1, reduce wear, and improve the corrosion resistance of the sealing material.

[0026] Working Principle: In use, this utility model utilizes a multi-layered composite structure consisting of an inner sealing layer 201, an intermediate buffer layer 202, and an outer support layer 203 to enable the valve seat to withstand higher pressures. This effectively prevents deformation and cracking of the valve seat body 2 under high pressure, ensuring the normal operation of the valve body 1. Simultaneously, the sealing groove 204 forms multiple sealing lines, significantly improving the sealing effect of the valve seat body 2. To further optimize sealing performance, the high-performance sealing material filled in the sealing groove 204 maintains good sealing performance under various harsh working conditions, effectively compensating for the gap between the valve seat body 2 and the valve disc portion of the valve body 1 to prevent leakage. To improve the sealing performance and service life of the sealing material, a lubricating and anti-corrosion coating reduces friction between the sealing material and the valve disc portion of the valve body 1, reducing wear and improving the corrosion resistance of the sealing material. This, in turn, improves the high-pressure resistance, leakage prevention effect, and service life of the valve seat body 2.

[0027] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

[0028] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A high-pressure resistant, leak-proof valve seat, comprising a valve body (1), characterized in that: The valve seat body (2) is annular in shape. It is composed of an inner sealing layer (201), an intermediate buffer layer (202), and an outer support layer (203). The intermediate buffer layer (202) is integrally formed on the outer end of the inner sealing layer (201). The inner sealing layer (201) is made of high-hardness and high-wear-resistant ceramic material. The intermediate buffer layer (202) is made of high-strength elastic material. The outer support layer (203) is integrally formed on the outer end of the intermediate buffer layer (202). The outer support layer (203) is made of high-strength metal material. A sealing groove (204) is provided on the inner wall of the valve seat body (2). A drain hole (205) is provided at the bottom of the sealing groove (204). The sealing groove (204) is filled with high-performance sealing material.

2. The high-pressure resistant, leak-proof valve seat according to claim 1, characterized in that: The valve seat body (2) is fixedly installed inside the flow channel of the valve body (1).

3. The high-pressure resistant, leak-proof valve seat according to claim 1, characterized in that: The inner sealing layer (201) is in contact with the valve disc portion of the valve body (1) for sealing, and the high hardness and high wear resistance ceramic material includes alumina ceramic or silicon carbide ceramic.

4. The high-pressure resistant, leak-proof valve seat according to claim 1, characterized in that: The high-strength elastic material includes rubber or polyurethane.

5. A high-pressure resistant, leak-proof valve seat according to claim 1, characterized in that: The intermediate buffer layer (202) is provided with multiple honeycomb or spiral cavity structures, which increases the deformation space of the intermediate buffer layer (202) through the cavity structures.

6. A high-pressure resistant, leak-proof valve seat according to claim 1, characterized in that: The high-strength metal material includes stainless steel or alloy steel, and there are several sealing grooves (204), which are symmetrically distributed from top to bottom along the inner wall of the valve seat body (2).

7. A high-pressure resistant, leak-proof valve seat according to claim 1, characterized in that: The sealing groove (204) is trapezoidal in shape, and the depth and width of the sealing groove (204) are determined according to the nominal operating pressure of the valve body (1) and the characteristics of the fluid medium.

8. A high-pressure resistant, leak-proof valve seat according to claim 7, characterized in that: The high-performance sealing material includes polytetrafluoroethylene sealing rings or flexible graphite sealing fillers, and the surface of the sealing material is coated with a lubricating and anti-corrosion coating.

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