Operation is done by means of the auxiliary service liquid (usually
water) fed into the compressor, that alternatively fills up and leaves
the impeller vanes. In the walls of the side plates are located
specially shaped orifices that are connected with the vanes of the
impeller that are being filled in one side and with the vanes that being
exhausted in the other side. In such a manner, while from one orifice
the air (or gas) is continuosly suctioned, from the other it is
discharged.
Thus the air (or gas) suctioned is compressed, having place a
regular and continuous air (or gas) transportation. The maximum
degree of compression reached, depends on the energy acquired
by the liquid in movement, from his nature as well as from the
speed of the impeller. Compressors could be supplied with auxiliary
liquid separators.