Low noise and high volumetric efficiency are hallmarks of the Voith IPVAP internal gear pump, which is suitable for variable-speed drives. Hydraulic oil is drawn in between the pinion and internal gear as the gear rotates past the 180 degrees. As the internal gear rotates past the opposing 180 degree position, hydraulic fluid is displaced by pinion teeth ingress into the gear teeth spaces, thereby displacing the hydraulic oil.
