Screw Compressors – How they work

The Screw compressors are of the monostable type of asymmetric screws driven by an electric motor. The air is compressed by rotating the male and female rotors parallel to each other and perfectly joined inside a cast iron crankcase.


The oil injected into the screw has the dual function of cooling the compression work and creating a perfect seal during the rotation of the screws. The compressed air leaves the screw group mixed with the lubricant and enters the separation tank. In it, a first separation of the oil by gravity and a final separation is carried out through a special high efficiency filter that purifies the compressed air up to 2-3 ppm. of waste oil.


The oil, after separation of the compressed air, passes through a cooling radiator and is controlled by a thermostatic valve, is injected at low temperature into the screw group.

The air cooling system is forced type.

The air is sucked from the outside, by means of a helical fan assembled in the secondary axis of the electric motor, and it crosses the motor cooling it effectively. The internal environment of the compressor, is subjected to pressurization and the ventilation air, forcedly exits the grid, through the air / oil radiator, removing the heat.

The soundproofing of the screw compressor is obtained with a coating of fire-retardant material fireproof of all internal panels.