Lobe pump 

• When the pump starts, the lobes start rotating without touching.

• As the lobes come out of mesh, they create expanding volume on the inlet side of the pump. Liquid flows into the cavity and is trapped by the lobes as they rotate.

• Liquid travels around the interior of the casing in pockets between the lobes and the casing (it does not pass between the lobes).
• The rotary lobe pump principle is generated by two lobes counter-rotating around separate and parallel shafts in the pump chamber to move liquids.

• When the pump starts working, the lobes create a vacuum for priming the fluid, then fluids fill the pump chamber and are pushed out of the chamber.