The oil-free screw compressor element
No oil means that there is absolutely no oil for sealing the rotors 
and for cooling the compressed surroundings, elements and rotors. … The component can be cooled by cooling drinking water that flows through particular pockets in the element casing.
In a lubricated screw compressor, the lubricant comes in direct in touch with the compressor inlet air and compressed air. … The essential oil contains anti-oxidants to attempt to reduce the breakdown of the lubrication Oil-free Screw Air Compressor china properties due to internal conditions.