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Valve body | Ductile iron (commonly used), carbon steel, stainless steel, STQNiCr (special for seawater resistance) |
Valve plate | Ductile iron (commonly used), carbon steel, stainless steel, STQNiCr (for seawater resistance) |
Valve stem | Stainless steel, duplex stainless steel (special for seawater resistance) |
Seals | EPDM/NBR/stainless steel/PTFE |
Pressure plate | Q235, stainless steel, duplex stainless steel (special for seawater resistance) |
Bolt | SS201 stainless steel, duplex stainless steel (special for seawater resistance) |
Packing gland | Cast steel WCB, STQNiCr (for seawater resistance) |
Other fasteners | Carbon steel galvanized, stainless steel |
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