An average rotary screw air flow compressor has two interlocking helical rotors contained in a Screw Air Compressor china housing. Air comes in through a valve, typically called the inlet valve and can be taken in to the space between the rotors. As the screws turn, they reduce the volume of the air, hence 
increasing the pressure.
The center 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 the actual compression takes place. It is the cardiovascular of the rotary screw air compressor.
A Rotary Screw Air Compressor is a compressor that uses a rotary-type positive displacement mechanism, called a rotary screw, air-end. … Rotary Screw Compressors also make use of two inter-twined helical designed screws, referred to as rotors, to compress the air flow.