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36 Inch Double Eccentric Metal Hard Seat Flanged Butterfly Valve / Electric Butterfly Valve / Bare Shaft Butterfly Valve / Valve Manufacturer, Find Details and Price about Valve Butterfly Valve from 36 Inch Double Eccentric Metal Hard Seat Flanged Butterfly Valve / Electric Butterfly Valve / Bare Shaft Butterfly Valve / Valve Manufacturer - Zhengzhou Top Valve Fluid Technology Co., Ltd.