Liquid Ring Vacuum Pumps for Industrial Applications

L Series - Highest water carry-over, lowest in class for horsepower use


The dry and contact-free operation of Elmo Rietschle’s positive displacement pumps require no lubrication in the pumping chamber. This translates into major advantages: no process contamination and no pollution caused by the pump operation. 

This optimized water lubricated technology has the ability to generate both pressure, and vacuum. During operation, the impeller spins, driving centrifugal forces to generate differentials in pressure. This product contains no oil, while also allowing small soft-solids to pass through the pump, unlike other types of vacuum technology and vacuum systems. While running, the water acts as the cooling agent, keeping your pump running efficiently and improving overall pump life.

High quality German engineering has put this product on top of the liquid ring market, ensuring that the quality is top notch.


  • Patented water reclamation system
  • Unique coatings
  • Stainless Steel options
  • Bronze alloy impellers
  • Anti-cavitation as standard

Regenerative Blowers (aka side-channel blowers)

L-BL2 Also known as the Elmo Rietschle "Pump in a Box"

These self-contained portable units are oil free and dry air cooled. They include an L-BV liquid ring pump, industrial electric motor, discharge separator, heat exchanger and discharge condenser. To install, simply connect the suction line and motor and fill the water tank— it's ready to go!

Learn More
L-BL2 vacuum pumps

L-BV7 / L-BV2

Our L-BV7 and L-BV2 single stage liquid ring vacuum pumps are efficient machines which save space and consume up to 50 % less water. These pumps are available in various combinations of materials such as stainless steel, bronze, ceramic and cast iron with a ceramic coating. This enables them to be tailored to the respective operating requirements and thus provides long term resistance to corrosion.

Learn More
L-BV7 vacuum pumps/compressors

L-BV5 Monoblock pumps with the highest volume flow

The L-BV5 family is characterized by a very high suction volume of up to 353 cfm with suction pressures of up to 29 inHg and are primarily used for applications with large quantities of liquids (2BV54). The L-BV5 also simultaneously works as a condenser while suctioning condensable vapors. This enables the suction volume to be doubled. 

Reinforced stainless steel shafts, continuously lubricated bearings and a coated pump housing prevent wear and tear caused by solids that are also ingested, and guarantee constant performance and vacuum level, even after many years of use.

Learn More
L-BV5 vacuum pumps/compressors

Performance & Technical Specifications: Liquid Ring Pumps


Air Map L-Series – Liquid Ring


With over 30 liquid ring pump models and configurations, Elmo Rietschle delivers precision options for your application.

  • Ceramic and brick industry
  • Drying systems
  • Environmental engineering
  • Food & beverage industries
  • Lifting and handling
  • Medical
  • Packaging
  • Plastics
  • Granulate conveying
  • Removal and compression of vinyl chloride gas

How They Work: Liquid Ring Vacuum Pumps and Compressors

The impeller (1) is the only moving part. The impeller rotates without contact inside the pump casing (2). A rotating liquid ring (3) seals the impeller on the front and seals its blades against one another. Gas flows through the inlet slot (4) into the blade cells. The impeller is offset within the casing. This creates variable compression chambers between the blades (5), which compresses the gas within a full revolution. In order to stabilize the ring, liquid is also permanently sucked into the compression chamber and is expelled (6) together with the conveyed gas.

How it Works - Liquid Ring