Alfa Laval MR Centrifugal pumps

Introduction

The Alfa Laval MR is a well proven liquid-ring pump specifically

developed for effective pumping of liquids with entrained air. The

construction of the MR makes it perfectly suited for use as a return

pump in CIP systems.

Applications

The Alfa Laval MR pump is specifically designed for pumping

liquids that contain air or gas and is most commonly used for CIP

return applications across the food, dairy, beverage and

pharmaceutical industries.

The MR pump is available in three sizes to handle capacities up

to 80 m3/h and differential pressures up to 5 bar at 50Hz.

Benefits

• Ideal for CIP return applications: well-proven design suited to

handle liquids with entrained air.

• Easy to operate: excellent suction capability ensures limited

impact on performance from changing fluid characteristics.

• Long service life: heavy-duty design used in CIP systems for

decades.

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.