A typical rotary screw air flow compressor has two interlocking helical rotors contained in a housing. Air will come in through a valve, typically known as the inlet valve and is taken in to the space between your rotors. As the screws turn, they reduce the level of the air, therefore increasing the pressure.
The cardiovascular of an air compressor is the screw element which is also called air-end. The air-end is certainly the most important part of any screw-type compressor. It’s that section of the machine where in fact the actual compression takes place. It is the cardiovascular of the rotary screw air flow compressor.
A Rotary Screw Atmosphere Compressor is a compressor that uses a rotary-type positive displacement Screw Air Compressor system, 
called a rotary screw, air-end. … Rotary Screw Compressors also make use of two inter-twined helical designed screws, known as rotors, to compress the atmosphere.