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High Temperature PTFE Ductile Iron Worm Wheel D371 Wafer Type 304 Stainless Steel Turbine Rotary Butterfly Valve, Find Details and Price about Casting Ductile Iron Wafer Butterfly Valve Cheap Price Wafer Butterfly Valve from High Temperature PTFE Ductile Iron Worm Wheel D371 Wafer Type 304 Stainless Steel Turbine Rotary Butterfly Valve - Tianjin Zhongfa Valve Co., Ltd.