Butterfly Valve: Butterfly Valve has a similar operation like Ball Valve. It is used to block the flow of Media (like Water, Chemical etc.). Generally, user preferred butterfly valve instead of ball valve because it is economical. It is available in Minimum size of 40mm. Butterfly valve has a simple structure which is contain Body, Seal, Stem, Rubber seat (Nitrile, EPDM, Viton), Disc (Sg Iron, SS) & Lever. It is easy to use by Lever & Gear. It will also operate by Actuator. Basically, up to 150mm butterfly valve is operated by Hand Lever & Above 150mm butterfly valve is Gear Operated.