A typical rotary screw atmosphere 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 usually taken in to the space between your rotors. As the screws switch, they reduce the level of the air, thus increasing 
the pressure.
The heart of an air compressor is the screw element which can be called air-end. The Screw Air Compressor china 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 occurs. It is the center of the rotary screw surroundings compressor.
A Rotary Screw Air Compressor is a compressor that uses a 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 flow.