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PN10 or PN16 cast iron flanged foot valve Supplier Main materials of parts 1.Body:GG20 GG25 GGG40 GGG50 2.Base:GG20 GG25 GGG40 GGG50 3.Spring:SS304 4.Stem:2Cr13 5.Disc:GGG50+EPDM 6.Bolt:SS304 7.Screen...