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