Rotary Liquid Seal Ring Air Compressor:

The rotary liquid seal ring-type, described in Figure, features a forward inclined, open impeller, within an oblong cavity filled along with liquid. Since the impeller rotates then the centrifugal force causes the seal liquid to collect at the outer edge of the oblong cavity. Because of the oblong configuration of the compressor case, large longitudinal cells are made and decrease to smaller ones. A suction port is positioned where the longitudinal cells are the largest, and for the discharge port, whereas they are smallest, therefore causing the vapor inside the cell to compress as the rotor rotates. A rotary liquid seal compressor is often used in specialized applications for the compression of very corrosive and exothermic gasses and is generally used in commercial nuclear plants as a means of establishing initial condenser vacuum.

Figure: Rotary Liquid Seal Ring Air Compressor