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D342X DN800 Double Flange Bidirectional Sealed Butterfly Valve / Sewage Butterfly Valve / China Butterfly Valve Research Center, Find Details and Price about Valve Butterfly Valve from D342X DN800 Double Flange Bidirectional Sealed Butterfly Valve / Sewage Butterfly Valve / China Butterfly Valve Research Center - Zhengzhou Top Valve Fluid Technology Co., Ltd.