The Elgi Air Compressor uses two rotors (helical screws) to compress the air. There’s a ‘female’ rotor and a ‘male’ rotor. The rotors are of different form, however match one another specifically to compress the Air. in an exceedingly dry running Elgi Air compressor, timing gears make sure that the male and female rotors maintain precise alignment. In an oil-flooded rotary screw compressor, lubricating oil bridges the area between the rotors, each providing a hydraulic sealand transferring energy between the driving and driven rotor. Gas enters at the suction side and moves through the threads because the screws rotate. The meshing rotors force the gas through the compressor, and therefore the gas exits at the end of the screws.