The HABERG liquid ring vacuum pumps (LRVP) are of the double-stage displacement type. The only movable parts are the shaft and the vane wheel impellers. They do not touch the stationary pump parts. Both shaft ends run in antifriction bearings. For sealing, mechanical seals are applied.
Using water with a temperature of 15 °C as service liquid and a pressure of 1013 mbar at the discharge branch, the lowest suction pressure achievable is 33 mbar. With other service liquid, such as oil, which has a low and stable vapour pressure, deeper vacuum of 25 mbar (abs) may be achieved.