An average Screw Air Compressor china rotary screw air flow compressor has two interlocking helical rotors within a housing. Air comes in through a valve, typically called the inlet valve and is definitely taken in to the space between your rotors. As the screws switch, they reduce the volume of the air, therefore increasing the pressure.
The heart of an air compressor is the screw element which can be called air-end. The air-end is usually the most important component of any screw-type compressor. It’s that section of the machine where in fact the actual compression occurs. It is the heart of the rotary screw atmosphere compressor.
A Rotary Screw Air 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.