Standard design

The MR Liquid-Ring Pump consists of pump casing, casing cover

and impeller made of acid-resistant, duplex-grade steel; EPDM,

FPM or NBR elastomers; stainless steel cap nuts, legs, leg

brackets, and adapter; and, stainless steel shroud with noise

absorbing interior lining protecting the motor. All models have an

external mechanical single seal.

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.

Working principle

The Alfa Laval MR Pump uses the principles of centrifugal force to

operate. However, instead of directing fluid into a ring- or volute

type casing around the periphery, the MR Liquid-Ring Pumps

transfer the fluid into channels on either side of the impeller, in the

front plate and back plate of the pump.

These side channels increase in volume as the impeller passes

the suction port, creating a vacuum and drawing in the liquid. This

volume is then automatically reduced at the discharge port,

creating pressure and forcing the liquid out, thereby providing the

pumping action.