A typical rotary screw air 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 certainly taken into the space between the rotors. As the screws switch, they reduce the level of the air, thus increasing the pressure.
The cardiovascular of an air compressor is the screw element which can be called air-end. The Screw Air Compressor china air-end can be the most important part of any screw-type compressor. It’s that area of the machine where in fact the actual compression 
occurs. It is the center of the rotary screw air flow 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 shaped screws, known as rotors, to compress the atmosphere.