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DN50 316L Stainless Steel Butterfly Valve Carbon Steel Flange Type Wafer Type Hard Seal Butterfly Valve, Find Details and Price about Wafer Type Hard Seal Butterfly DN50 Butterfly Valve from DN50 316L Stainless Steel Butterfly Valve Carbon Steel Flange Type Wafer Type Hard Seal Butterfly Valve - YOONAD VALVE (WUXI) CO., LTD.