The common valve body materials for diaphragm valves include gray cast iron, ductile iron, carbon steel, stainless steel and bronze.
The valve body is constructed from strong, rigid, and corrosive resistant materials.
Gray Cast Iron: A general‐purpose material suitable for water, air, petroleum products, most solvents, dry powders, and a wide variety of chemicals when used in the unlined state.
Ductile Iron: A general‐purpose material with usage similar to cast iron. Ductile iron however is much stronger and more capable where there may be high pipeline stresses, danger from impact, or concern from leakage upon line or valve fracture.
Carbon Steel: Another general‐purpose material that is somewhat resistant to corrosion then cast iron especially where water is the media. Steel is much stronger and like ductile iron much more capable where there may be high pipeline stress, danger from impact, or concern from leakage upon line or valve fracture.
Stainless Steel: An alloy of iron, carbon, nickel, and chromium. Suitable for most foods, beverages, pharmaceuticals, solvents, sea water, oils, and some acids and alkalis.
Bronze: Has a higher strength than pure copper. It is generally accepted as an industry standard for pressure rated valves and fittings. It is very resistant to pitting corrosion, with general resistance to most chemicals.
cast iron diaphragm valve body
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