An average rotary screw air flow compressor has two interlocking helical rotors within a housing. Air comes in through a valve, typically known as the inlet valve and is usually taken in to the space between your rotors. As 
the screws convert, they reduce the volume of the air, hence increasing the pressure.
The heart of an air compressor may be the screw element which is also called air-end. The air-end is usually the most important part of any screw-type compressor. It’s that Screw Air Compressor china section of the machine where in fact the actual compression takes place. It is the heart of the rotary screw air compressor.
A Rotary Screw Air flow Compressor is a compressor that runs on the rotary-type positive displacement system, called a rotary screw, air-end. … Rotary Screw Compressors also use two inter-twined helical formed screws, referred to as rotors, to compress the air.