... and closing, convenient operation and labor saving, the butterfly plate and the sealing ring, without sliding, sealing ... tags: Flange Type Butterfly Valve, China manufacturer, factory, mill, supplier, cheapFlange Concentric Butterfly ValveThe Flange Concentric Butterfly Valve is widely ... without disturbing the other side. Huachao Flange Concentric Butterfly Valves are with main features as bellow:Size ...