The materials used for each part of the valve play a crucial role in determining the longevity and effectiveness of the valve. Here are the recommended materials for each part:

1. Valve body: The valve body should be mainly made of ductile iron. The grade and actual physical and chemical test data of the cast iron should be indicated.
2. Stem material: The stem of the valve should preferably be made of stainless steel (2CR13). In the case of large diameter valves, stainless steel embedded stems should also be used.
3. Nut material: The nut material should be made of cast aluminum brass or cast aluminum bronze. The hardness and strength of the nut material should be greater than that of the valve stem.
4. Valve stem bushing material: The valve stem bushing material should have a hardness and strength not greater than that of the valve stem. It should also not form electrochemical corrosion with the valve stem and valve body under water immersion.

By selecting the appropriate materials for each part of the valve, the valve can function effectively and efficiently for a longer period of time.

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