The principle of side channel - long used in hydraulic pumps - was transposed into compressors and vacuum pumps for very specific applications: pneumatic transport, water treatment, plating baths, aquarium oxygenation for fish, air supply to industrial ovens / burners, printing, chemical, pharmaceutical, etc..
The particular principle of the operation and the structrual features of theses machines is that they never put in contact the rotor and the stator of the pump (no metal contact). This operation without friction, free from wear, and without lubrification needs no maintenance.
