Positive displacement compressor-a compressor that directly relies on changing the gas volume to increase the gas pressure.
Piston compressor-is a positive displacement compressor, the compression element is a piston, reciprocating in the cylinder.
Rotary compressor-is a positive displacement compressor, compression is achieved by the forced movement of rotating elements.
Sliding vane compressor-is a rotary variable volume compressor, the axial sliding vane slides radially on the rotor eccentric to the same cylinder. The air trapped between the sliders is compressed and discharged.
Liquid-piston compressor-is a rotary displacement compressor in which water or other liquid is used as a piston to compress gas, and then discharge the gas.
Roots double-rotor compressor-is a rotary displacement compressor, in which two Roots rotors mesh with each other to intercept the gas and send it from the air inlet to the exhaust. There is no internal compression.
