The sealing face is a critical working surface for SINNUO valves, as the quality of the sealing face directly affects the lifespan of the valve. The material of the sealing face is also a significant factor in ensuring the quality of the sealing face. Therefore, when selecting sealing face materials for SINNUO valves, the following factors should be considered:

1. "Corrosion-resistant." Corrosion refers to the process where the surface is damaged under the action of a medium. If the surface is damaged in this way, the sealability cannot be guaranteed, thus, the sealing surface material must be corrosion-resistant. The corrosion resistance of the material mainly depends on its composition and properties.

Chemical stability.

2. Scratch Resistance: "Scratch" refers to the damage that occurs to a material due to friction during relative motion of sealing surfaces. Such damage inevitably leads to the destruction of the sealing surfaces. Therefore, sealing materials must possess excellent scratch resistance, especially for the Zhongnuclear Sufa valve gate valves. The scratch resistance of the material tends to...

The direction is determined by the internal properties of the material.

3. Corrosion Resistance. "Corrosion" refers to the process in which the sealing surface is damaged as the medium flows at high speed through the sealing surface. This damage is more pronounced in throttling valves and safety valves used with high-temperature, high-pressure steam mediums, significantly impacting the seal integrity. Therefore, corrosion resistance is also one of the important requirements for the material of the sealing surface.

4. It should possess a certain hardness and exhibit a significant decrease in hardness at the specified working temperature.

5. The linear thermal expansion coefficient of the sealing face and the main body material should be approximately similar, which is more important for the structure of the镶嵌sealing ring to prevent the occurrence of additional stress and loosening at high temperatures.

Under high-temperature conditions, sufficient antioxidant, heat fatigue resistance, and thermal cycling properties are required.