Material selection for high-temperature resistant vacuum pressure switches

The material selection of high-temperature resistant vacuum pressure switches requires a comprehensive consideration of multiple factors. The following are the key points:

Shell material

Metal material:

Brass: It has good mechanical properties and corrosion resistance, with excellent processing performance. It can withstand certain pressure and temperature changes and is suitable for a variety of industrial environments.

Stainless steel: It features outstanding high-temperature resistance and corrosion resistance, high mechanical strength, and can maintain stability in high-temperature and harsh chemical environments. It is suitable for applications with high requirements for corrosion resistance and high-temperature resistance.

Non-metallic material

Engineering plastics: Some high-performance engineering plastics, after special treatment, possess certain high-temperature resistance, and also have the advantages of light weight and good insulation. However, in terms of high-temperature resistance limit and mechanical strength, they are usually inferior to metal materials.

Sealing material

Rubber products:

Fluororubber: It features excellent high-temperature resistance, oil resistance and chemical corrosion resistance. It can maintain good sealing performance in high-temperature environments and is suitable for applications in contact with various oils and chemical media.

Silicone rubber: It has good high-temperature resistance, as well as excellent elasticity and aging resistance. It can maintain a sealing effect over a wide temperature range and is often used in scenarios where there are certain requirements for sealing performance and temperature resistance.

Other sealing materials: such as polytetrafluoroethylene, which has an extremely low coefficient of friction and good chemical corrosion resistance, can maintain good stability at high temperatures, and can be used in some vacuum pressure switches with high requirements for the purity and corrosion resistance of sealing materials.

Material of the sensing element

Diaphragm material:

Metal diaphragms: Usually made of metal materials such as stainless steel, they have high strength and elasticity, can withstand large pressure changes, and maintain stable performance in high-temperature environments. They are suitable for high-pressure and high-temperature measurement environments.

Ceramic diaphragm: It features excellent high-temperature resistance and corrosion resistance, outstanding insulation performance, and is sensitive to pressure changes. It is suitable for vacuum pressure switches with high requirements for precision and temperature resistance.

Spring material: Generally, high-temperature resistant alloy spring steel is selected. This material can still maintain good elasticity and strength at high temperatures, ensuring that the sensing element can accurately respond to pressure changes.