The oil-free screw compressor element
No oil implies that there is absolutely no essential oil for sealing the rotors and for cooling the compressed surroundings, elements and rotors. … The element can be cooled by cooling drinking water that flows through Oil-free Screw Air Compressor china 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 break down of the lubrication properties due to internal conditions.