+44 (0)1924 221 001

An internal rotary gear pump is a positive displacement pump which employs a rotor and idler gear assembly to generate its flow. The assembly is offset, using a crescent adjacent to the inner gear, all within an outer gear.. As the rotor gear drives the idler gear, the space caused by the crescent offsetting the gears and the meshing of the gear teeth displace the fluid, expelling it to the discharge port.

What applications and fluids is it suitable for?

An internal rotary gear pump is typically specified for viscous fluids such as oils, bitumen, fats, syrups, chocolate and resins as the more viscous the product is, the more efficient the displacement aspect of the working principle becomes. An internal rotary gear pump can handle fluids with a viscosity of 100,000cSt!

How do internal rotary gear pumps work? 

Rotary Gear Pumps