The oil-free screw compressor element
No oil implies that there is no oil for sealing the rotors and for cooling the compressed air flow, elements and rotors. … The component is certainly cooled by cooling drinking water that flows through unique 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 oil contains anti-oxidants to try to reduce the breakdown of the lubrication properties due to Oil-free Screw Air Compressor china internal conditions.