The sealing surface of the valve is a vulnerable component of the valve due to frequent corrosion, erosion, and wear from the medium. Automatic valves such as pneumatic ball valves and electric butterfly valves have frequent and fast opening and closing speeds, and the quality of their sealing surfaces directly affects the service life of the valves. The basic requirement for valve sealing surface is to ensure safe and reliable sealing under specified working conditions. Therefore, the material of the valve sealing surface should have the following characteristics.

1. Good sealing performance. The sealing surface should be able to effectively prevent the leakage of the medium;

2. A certain strength. Under the action of medium pressure difference, the sealing surface should be able to withstand the sealing specific pressure value formed by it;

3. Corrosion resistance. The sealing surface should have strong corrosion resistance that is suitable for the design requirements under the long-term action of corrosive media and stress;

4. Ability to resist scratches. The valve sealing pairs are all dynamic seals, and there is friction between the sealing pairs during the opening and closing process;

5. Erosion resistance. The sealing surface should be able to resist the erosion of high-speed media and the collision of solid particles;

6. Good thermal stability. The sealing surface should have sufficient strength and antioxidant capacity at high temperatures; At low temperatures, it should have good resistance to cold brittleness;

7. Good processing performance. Easy to manufacture and maintain, the valve functions as a universal component, ensuring economic value.