Main part of Screw Compressor is Air-end, consisting of a pair of rotors. The male motor is driven by electric motor. Suction of air though Inlet filter and suction control valve. Air – oil mixture from air-end flows into an air – oil separator. The separated oil flows through oil filter and after cooling in 'cooler', it gets back into the system. The air also passes through air cooler and to the receiver. The whole system is controlled through valves / sequence of compressor is done through electric /electronic control.