The oil-free screw compressor element
No oil means that there is absolutely no essential oil for sealing the rotors and for Oil-free Screw Air Compressor china cooling the compressed air flow, elements and rotors. … The component is cooled by cooling water that flows through particular pockets in the element 
casing.
In a lubricated screw compressor, the lubricant will come in direct in contact with the compressor inlet air and compressed air. … The essential oil contains anti-oxidants to try to reduce the break down of the lubrication properties because of internal conditions.