A (shesternnyi nasos) is a type of positive displacement (PD) pump that moves fluid by repeatedly enclosing a fixed volume within interlocking gears. These pumps are widely valued for their simplicity, reliability, and ability to handle high-pressure and high-viscosity applications. Core Working Principle

The basic mechanism relies on two gears rotating inside a closely fitted casing.

: The fluid becomes trapped in the spaces between the gear teeth and the pump casing. It is then carried around the perimeter of the gears as they rotate.