An average rotary screw Screw Air Compressor china surroundings compressor has two interlocking helical rotors within a housing. Air comes in through a valve, typically called the inlet valve and is usually taken into the space between your rotors. As the screws convert, they reduce the level 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 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 heart of the rotary screw air compressor.
A Rotary Screw Surroundings Compressor is a compressor that uses a rotary-type positive displacement system, called a rotary screw, air-end. … Rotary Screw Compressors also make use of two inter-twined helical shaped screws, referred to as rotors, to compress the air.