The lobe-rotor pump has two rotors, usually with 2-3 lobes each. A vacuum is created at the inlet when the rotors rotate. This vacuum draws the liquid into the pump. It is then moved along the periphery of the pump casing to the outlet. There the volume is reduced and the liquid forced out through the outlet. The capacity of the lobe-rotor pumps in our stock varies between 100 till 6000 litres per hours.