The MR liquid ring pump works based on centrifugal force, similarly to Alfa Laval LKH and SolidC pump ranges. However, in the MR design the fluid is not directed into a ring or volute type casing around the periphery. Instead, it passes into channels on either side of the impeller, in the front and back plate of the pump.
These side channels increase in volume as the Impeller passes the suction port, creating a vacuum and draws liquid in. This volume then automatically reduces at the discharge port, creating pressure and forcing liquid out, thus providing the pumping action.
A proportion of the centrifuged liquid is retained around the periphery and re-circulates, forming a “liquid ring” that is used to maintain the prime.
The grouping of expansion and contraction of volume, centrifugal force and liquid ring construction increases the permissible gas content in the liquid being pumped.