We all know that the valve sealing surface is the most critical surface, the sealing surface quality directly affects the service life of the valve, the sealing surface of the material is an important factor to ensure the quality of the sealing surface. Therefore, the selection valve sealing surface material should consider the following factors:
1> corrosion "corrosion" that the sealing surface in the role of the media, the surface damage process. If the surface is affected by this failure, sealing can not be guaranteed, therefore, the sealing surface material must be resistant to corrosion. And its extreme chemical stability corrosion-resistant materials depends on the material.
2> scratch "scratch" that the sealing surface relative motion, the material damage caused by friction. This damage will cause damage to the sealing surface of the sealing surface, therefore, the material must have good anti-abrasion performance, especially valve. Scratch resistance of materials is often determined by the internal properties of materials.
3> erosion "erosion" is medium high speed through the sealing surface, the sealing surface damage process. This failure in high temperature, high pressure steam medium throttle valve, safety valve is more obvious, a great impact on the seal damage, therefore, erosion-resistant is one of the important requirements of sealing surface material.
4> valve sealing surface should have a certain hardness, and under specified operating temperature hardness big drop.
5 sealing surface and bulk material coefficient of linear expansion should approximate, the insert ring structure is more important to avoid high temperature, easy to produce the additional stress and cause loosening.
6 in high temperature under the conditions of use, have antioxidant, thermal fatigue resistance and thermal cycle, enough.
Thus it can be seen that, in the present circumstances, to seal the surface material found in full compliance with the requirements of the is very difficult to achieve, can only be based on the valve and use of different, mainly to meet certain requirements. For example, the use of high-speed media should pay special attention to the valve sealing surface erosion requirements; and the medium containing solid impurities should be chosen when the sealing surface material with higher hardness.
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