In positive displacement compressors, after each compression in the working chamber, the gas enters the cooler for cooling, which becomes a "stage".
In power compressors, the compressor is often compressed two or more times before entering the cooler for cooling. The several compression "stages" for each cooling are collectively called a "section".
In Japan, the "stage" of the positive displacement compressor is called "segment", and some areas and documents in China are affected by this. The "stage" is also called "segment".
