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Liquid ring vacuum pumps (1-stage and 2-stage) are used to generate a vacuum up to 33mbar (a). In turn, air and other gases and vapors compress to a pressure of 2.5 bar (a). These pumps are characterized by a simple structure, resistance to contamination and high temperature of sucked gases.

Pumps in the 1-stage version work well for vacuum levels ≥150mbar (a), but for lower pressures, the 2-stage version is better. The service liquid circuit can be open (no cooling) or closed with a heat exchanger and recirculation. There are also mixed systems with partial recirculation of service liquid.

Properly selected materials of the body, impeller and seals as well as a properly made installation with protection against dry-running and cavitation ensure many years of failure-free operation of the pump.

Pumps with a liquid ring are also available in the Atex version and can pump hazardous gases.

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