Gear pumps are positive displacement Pumps, a popular pumping principle. These are often used for pumping lubricating Liquids, Oils, and other Viscous Liquids.
It is well known that Helical and herringbone gears typically offer a smoother flow than spur gears, though all gear types are relatively smooth. For this reason, our large-capacity gear pumps use helical or herringbone gears. The small external gear pumps typically operate at 1750 or 3450 rpm whereas the larger models operate at lower speeds.