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Concentric Flange End Butterfly Valves, China Flange Butterfly Valve, Find Details and Price about Gear_Box_Flanged_Type__Butterfly_Valve Concentric-Resilient-Seated-Butterfly-Va from Concentric Flange End Butterfly Valves, China Flange Butterfly Valve - Luofu Valve Group Zhejiang Zhonggong Valve Co., Ltd.