Liquid Ring Vacuum Pumps
The internals of the liquid ring vacuum pump or compressor are partially filled with liquid in operation. Casing and port plates form the internals, where the eccentrically mounted rotating impeller forms a liquid ring. The liquid ring forms a cell between the impeller blades, that expands during rotation and thus draws the gas through the suction port. As the impeller rotates further, these cells are getting smaller and consequently compressing the gas through the discharge port.
Together with the gas, a part of the liquid will be expelled through the discharge port that is separated from the gas in the separator.