The sealing surface is the most critical face of the valve. The quality of the sealing surface directly affects the service life of the valve. The sealing surface material is also an important factor to ensure the quality of the sealing surface. Therefore, the choice of valve sealing surface material should consider the following factors: 1. Corrosion "corrosion" that the sealing surface under the medium, the surface is damaged process. If the surface is damaged by this, the sealing can not be guaranteed, therefore, the sealing surface material must be resistant to corrosion. The corrosion resistance of a material depends largely on the material and its chemical stability. 2. Anti-scratch "abrasion" that is, the relative movement of the sealing surface, the material due to friction caused damage. This damage will inevitably lead to the destruction of the sealing surface, therefore, the sealing surface material must have good abrasion resistance, especially gate valve. Scratch resistance of materials is often determined by the material's internal properties. 3. Erosion erosion "erosion" that the medium flow through the sealing surface at high speed, so that the sealing surface was destroyed process. This destruction in the high temperature and high pressure steam medium used in the throttle, the relief valve is more obvious, a great impact on the sealing damage, therefore, erosion-resistant sealing material is also an important one of the requirements. 4. Valve sealing surface should have a certain degree of hardness, and the provisions of the working temperature of a great decline in the hardness. 5. Sealing surface and body material should be similar to the linear expansion coefficient, which seals the ring structure is more important in order to avoid high temperature prone to additional stress and cause looseness. 6 in high temperature conditions, there must be sufficient anti-oxidation, thermal fatigue resistance and thermal cycling and other issues. In the current circumstances, to find a full meet the above requirements of the sealing surface material is difficult to achieve, only according to different valves and uses, focusing on meeting certain requirements. For example, the valves used in high-speed media should pay special attention to the erosion-resistant requirements of the sealing surface; and when the medium contains solid impurities, the sealing surface material with higher hardness should be selected.
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