Screw air compressor units are mainly composed of the following systems: air flow system, lubricating oil flow system, cooling system, safety protection system, control system, and electrical circuits.

The main components of the screw air compressor unit include air end, motor, air filter, inlet valve, oil and gas separator, air cooler, lubricating oil cooler, pressure switch, check valve, air receiver tank, pressure gauge, automatic drain valve, safety valve, and other equipment components. Additionally, most air compressor systems are equipped with refrigerated dryers and air dryers.