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Large Diameter Electric Triple Offset Flange / DN400 to DN3000 with Worm Gearbox Body Ductile Iron Seat 304+Stl Corrosion Resistant Butterfly Valve, Find Details and Price about Large Diameter Butterfly Valve Frictionless Operation from Large Diameter Electric Triple Offset Flange / DN400 to DN3000 with Worm Gearbox Body Ductile Iron Seat 304+Stl Corrosion Resistant Butterfly Valve - Sunfair Fluid Control Co., Ltd