新郑市登封壳牌导轨油-空压机油直营点Air compressor oil can be divided into reciprocating air compressor oil and rotary air compressor oil according to the structural type of the compressor, and each has three levels of light, medium and heavy load. Air compressor oil can be divided into mineral oil type compressor oil and synthetic type compressor oil according to the base oil variety Positive displacement compressor--is a rotary volume compressor in which water or other liquid acts as a piston to compress the gas and then discharge it. Roots twin rotor--belongs to the rotary volume compressor, in which two Roots rotors mesh with each other, thus trapping the gas and transporting it from the intake port to the exhaust. No internal compression.