A positive displacement pump is a Gear pump. It transfers fluid by continually enclosing a defined volume with interlocking cogs or gears and mechanically transferring it via a cyclic pumping motion. It produces a smooth, pulse-free flow that is proportionate to the rotational speed of its gears. A gear pump transfers fluid by enclosing a set volume inside interlocking cogs or gears and physically transferring it to give a smooth, pulse-free flow proportionate to the rotating speed of its gears.
