Usually by compressor
According to different discharge pressures,compressors can be divided into low pressure compressors—discharge pressure less than 1.0MPa; medium pressure compressors—discharge pressure 1.0MPa～10MPa; high pressure compressors—discharge pressure 10MPa～100MPa; ultra-high pressure compressors— Exhaust pressure is greater than 100MPa and so on. The low-pressure compressor is a single-stage type, and the medium-pressure, high-pressure and ultra-high-pressure compressors are multi-stage, and the maximum number of units can reach 8 stages. The ultra-high-pressure diaphram compressor for polyethylene with a pressure of 343MPa has been made abroad. According to the different compression media, the general compressor can also be called: air compressor, oxygen compressor, nitrogen compressor, hydrogen compressor and so on.