Two rotors rotate without contacting each other or the cylinder and this fact eliminates the need for any oil lubrication inside the cylinder, hence the oil-free operation of the blower. The rotation of the rotors is synchronized using a pair of synchronizing gears.

Each blower is consisted of the following main parts:

Rotors
Based on the blower size, they are made of special cast iron or carbon steel and are dynamically balanced at the end of production.

Gears
They are helical and made of special heat treated carbon steel.

Bearings
Rotors are held in place using bearings. Oiling of bearings and gears are done using splash disks in oil chambers.

Seals
The conveying chamber is sealed and separated from oil chambers using labyrinth seals.

Cylinder and cylinder heads
They are made of grey cast iron and do not need any cooling system.

Two symmetrical rotors convolute in opposite directions. The medium to be conveyed flows into the housing surrounding the rotors, and is displaced in a positive manner from the inlet to the discharge side via the chambers formed between the rotors and the housing. At the very moment the rotor tip clears the edge of the pre-inlet channel, the volume of the gas displaced is compressed by the backflow of the pressurized gas present in the conveying piping at the discharge socket.
The final pressure automatically adjusts itself to the pressure level in the downstream piping and components. The flow required to convey all types of gases under various operating conditions can be calculated once specific blower data are known. Each rotor revolution results in the displacement and compression of the so-called scoop volume qo (liter/revolution).