The same medium, at high temperature, has relatively active molecular activity. Some medium with general corrosivity may cause severe corrosion damage to the metal raw materials of valve body and valve internals. The medium enters the metal interior in a high-speed ionic state, which changes the characteristics of materials, such as thermal expansion, intergranular corrosion, etc. Therefore, the selection of materials, In addition to the cost performance ratio, we should also consider the ineffectiveness under multiple factors. 　　

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