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ANSI CLASS300 WCB gate valve handwheel Materials of parts 1.Body:ASTM A216 WCB,A351 CF8,A351 CF8M 2.Bonnet: ASTM A216 WCB,A351 CF8,A351 CF8M 3.Stem:2Cr13,SS304,SS316,Carbon Steel 4.Stem Nut:brass...