Internal gear pumps are positive displacement pumps that feature a rotor and idler gear arrangement to ensure flow. In this design, a crescent-shaped divider is included with the internal gear, and the entire mechanism operates within an external gear structure. As the rotor gear rotates the idler gear, the crescent separates the gaps between the gears. Thus, the liquid is volumetrically retained in the area where the gears separate, and at the point where the gears meet, it is directed with pressure to the outlet port. Thanks to this principle, internal gear pumps offer low-pulse flow, high efficiency, and reliable performance.