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DN100 PN16 GG25 cast iron swing check valve Main materials of parts 1.Body:GG25 2.Bonnet:GG25 3.Stem:2Cr13/SS304/SS316/Carbon Steel 4.Stem Nut:SS201/brass 5.Disc:EN-GJL-250/GGG50 6.Seat:Bronze,Brass 7...