A liquid ring screw air compressor vacuum pump is easy to operate and is used in several applications across various industries. A liquid ring 
pump works together with a sealant necessary in its operation. This liquid could be water, essential oil or any other solvent which can be rotated by an impeller within the casing of the pump.
The typical oil found in a large rotary piston vacuum pump is a mineral oil that is through a distillation process to reduce its vapor pressure. These vacuum pumps possess an ultimate vacuum, occasionally called “blank off” vacuum, of 0.010 Torr (10 microns, 1 x 10-2 Torr or 0.0133 mbar).
