This product is no longer offered by this manufacturer.

However, spare parts and service materials may still be available. Contact CSI for help with repairs, maintenance, or replacement.

Alfa Laval MR Series Liquid Ring Pumps

Central States Industrial (CSI) offers the MR Liquid Ring pump from Alfa Laval. The unique design of the MR Liquid Ring makes it ideal for pumping liquids that contain air or gas. This pump is most commonly used as a clean-in-place (CIP) return pump.

The MR Liquid Ring pump is 3-A compliant, and features an "external" mechanical seal for maximum hygiene. One seal can fit up to three models, reducing the need for spare parts.


  • MR-166
  • MR-185S
  • MR-200S

The MR liquid-ring pump is especially designed for pumping liquids which contain air or gas. This versatile 3-A compliant pump can be used in the food, pharmaceutical, chemical, and similar industries. The main use of the MR liquid-ring pump is in CIP return applications.

Standard Design

All product wetted parts—including the pump casing, casing cover, and impeller—are built with 316L stainless steel. The cap nuts, legs, and leg brackets are constructed with 304 stainless steel. Other design features include EPDM rubber elastomers and a cast iron adaptor coated in zinc for improved corrosion resistance. The motor is a standard C-faced, foot mounted motor according to NEMA standard (1750 rpm, Class F).

Shaft Seals

The mechanical single seals have AISI 329 stainless steel stationary seal rings and carbon rotating seal rings.

Surface Finish32 Ra
Product Wetted Steel Parts316L
Other Stainless Steel Parts304
AdaptorMild steel
Product Wetted SealsEPDM (acc. to FDA)
Max Inlet Pressure60 psi
Temperature Range14°F – 284°F (EPDM)
Voltage and Frequency3~, 60 Hz, 230/460V
Motor Sizes
16660 Hz3 Hp - 1750 rpm
18560 Hz7.5 Hp – 1750 rpm
20060 Hz15 Hp – 1750 rpm

Spare Parts

MR 166 Seal Kits


MR 185, 200 Seal Kits
Single (C/SS)961192194996119219509611921951
Single (SIC/SIC)961192195296119219539611921954

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