What are the basic characteristics of the sealing material of the air control valve

Air control valves play a key role in industrial automation and fluid control systems, and their sealing performance is directly related to the overall efficiency, reliability and safety of the system. As an important component of air control valves, the characteristics of sealing materials determine the performance and applicability of valves in various working environments.

Basic characteristics of sealing materials
The basic characteristics of sealing materials include temperature resistance, corrosion resistance, compressibility, recovery, wear resistance and elasticity. These characteristics jointly affect the performance and applicability of sealing materials in specific applications.

Temperature resistance
Temperature resistance refers to the ability of sealing materials to maintain stable performance under extreme temperature conditions. There are significant differences in the temperature resistance range of different materials, and the operating temperature of the valve must be considered when selecting. For example, polytetrafluoroethylene (PTFE) can be used in environments up to 260°C, while the temperature resistance range of silicone rubber is usually between -60°C and 200°C. If the temperature resistance of the material is insufficient, it may cause the seal to fail, thereby affecting the normal operation of the entire system.

Corrosion resistance
Corrosion resistance refers to the ability of sealing materials to resist erosion by chemical media. In the chemical, pharmaceutical and other industries, sealing materials often need to come into contact with strong acids, alkalis or other corrosive gases, so it is particularly important to choose materials with excellent corrosion resistance. PTFE and some special rubbers (such as fluororubber) show excellent corrosion resistance and can maintain good sealing effects in harsh environments.

Compressibility and recovery
Compressibility refers to the ability of the sealing material to deform when under pressure, while recovery refers to its ability to return to its original state after pressure relief. Good compressibility ensures that the sealing material forms a tight seal when the valve is working, effectively preventing gas leakage. At the same time, excellent recovery can prevent permanent deformation of the sealing material due to long-term compression, thereby significantly extending its service life.

Wear resistance
During the operation of the air control valve, friction will occur between the sealing material and the valve body and valve disc, so wear resistance becomes one of the important characteristics of the sealing material. Materials with strong wear resistance can effectively reduce wear and extend the service life of the seal. For example, polyurethane materials have good wear resistance and are particularly suitable for high-frequency switching valve applications.

Elasticity
The elasticity of the sealing material enables it to better adapt to the working state of the valve and ensure close contact between the sealing surfaces. Materials with good elasticity can maintain excellent sealing performance during the opening and closing of the valve, reducing the risk of leakage. Rubber materials usually show good elasticity and are suitable for low-pressure and low-temperature applications.