Internal Eccentric & External Gear Pumps - Tapflo Pumps UK

A Gear Pump is a type of positive displacement pump that is widely recognised for its exceptional fluid transfer capabilities. Gear Pumps work by enclosing a fixed volume of fluid using interlocking cogs or gears that create a continuous flow of fluid. There are 2 fundamental designs of Gear Pumps: external and internal.

In the case of an external Gear Pump, the pump comprises two identical gears, supported by separate shafts. Typically, one gear is driven by a motor, which in turn drives the second gear, known as the idler (it is possible to have both shafts driven by separate motors). The casing supports the shafts on either side, ensuring smooth operation.

Internal Gear Pumps operate in the same principle but with a slight variation. The interlocking gears are of different sizes, with one rotating inside the other. The larger gear, called the rotor, has teeth projecting on the inside. Within the rotor, there is a smaller externals gear (idler) which is mounted off-centre. The idler gear is designed to engage with the rotor teeth at a single point, creating a perfect fit.

Our Gear Pumps have been engineered to meet the highest safety standards and can be ATEX rated upon request, making them suitable for hazardous applications. They are well suited to the transfer of viscous and semi-viscous fluids, with typical uses including fuel/petroleum, caustic, adhesive, solvent, paint/dye, pharmaceutical, detergent and food applications.

At Tapflo UK, we offer a range of Internal Eccentric and External Gear Pumps that provide numerous benefits including accurate and pulseless flow at high differential pressures, the ability to pump highly viscous fluids, mechanical efficiency across differing pressures and varying flows, efficient suction lift and bi-directional flow, to name a few.