Internal Gear Pump
Internal gear pumps, or crescent pumps, are characterised by their low pulsation, high efficiency, low level of noise, and high operating pressures. An internal gear drives an external toothed ring. Since the driving gear is mounted on an eccentric bearing, clearances result in the gaps between the gear and ring. These clearances form the delivery volume. A crescent-shaped seal between the gear and the ring forms the enclosed volume that is necessary to reach the required pressure.