what's using condition of butterfly valve ?

butterfly flap valve is a simple structure of the control valve, the valve can be used to switch control of the low-pressure pipeline medium refers to closed parts (disc or disc) to the disc around the valve axis to achieve the opening and closing a valve, the valve can be used to control the flow of air, water, steam, corrosive media, mud, oil, liquid metals and radioactive fluids and other types of media. On the main pipeline from the off and throttling effect. Valve opening and closing member is a disc-shaped butterfly plate in the valve body around its own axis, so as to achieve the purpose of opening and closing or adjusting.