1. Pressure increase by volume reduction is the principle behind rotary vane operation. The whole cylinder housing is wetted with a film of oil on which the blades run almost without any wear.
2. The oil lubrication is produced purely by the differential pressure of the housing and the oil separator housing. This is achieved through some oil pipes between the housings.
3. In a cylindrical housing, a rotor is positioned eccentrically so that it is on the top almost touching the cylinder housing. The blades are pressed on the wall of the housing by centrifugal force and generate three different chambers which capture the air.
4. When the first chamber is opened, the air flows through the suction flange into the compressor chamber.
5. While the rotor rotates, the next blade closes this chamber (and opens directly the next one) At this point the area between the blades has achieved its maximum air volume.
6. The oil gas mixture gets compressed by volume reduction and blows out into the oil separator housing.
7. Some pump models are fitted with outlet valves which stop the backflow of discharged air when the maximum pressure has been reached or the pump is switched off.
8. Oil is mechanically separated from the gas by the complex construction of the oil separator housing. Oil is collected in the oil sump.
This process removes 95-98% of the oil content in the air.
9. The remaining oil gas mixture is then taken through fine filter elements which removes the remaining small oil particles. These oil particles will be reintroduced through a float valve into the pump‘s oil circuit.
10. Virtually oil-free gas can either be blown out through the air outlet or through hoses or pipes.
