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DN200 Pn16 Ductile Cast Iron Ggg50 Flange Gearbox Operated Centric Factory Flanged Water Butterfly Valve, Find Details and Price about Double Eccentric Butterfly Valve Eccentric Butterfly Valve from DN200 Pn16 Ductile Cast Iron Ggg50 Flange Gearbox Operated Centric Factory Flanged Water Butterfly Valve - Tianjin Davan Flowtek Co., Ltd.