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D342X DN1600 Double Flange Soft Seal Butterfly Valve/Circulating Water Butterfly Valve/Made in China/Ductile Iron Butterfly Valve, Find Details and Price about Valve Butterfly Valve from D342X DN1600 Double Flange Soft Seal Butterfly Valve/Circulating Water Butterfly Valve/Made in China/Ductile Iron Butterfly Valve - Zhengzhou Top Valve Fluid Technology Co., Ltd.