What is a positive displacement pump? Positive displacement pumps are dry self-priming and are typically used for pumping highly viscous fluids. Positive displacement pumps are divided into two categories - rotary motion and reciprocating motion pumps. The PT wellpoint piston pumps from BBA Pumps also fall under the positive displacement principle.

How does a positive displacement pump work?

A positive displacement pump draws in the medium by enlarging part of the pumping space and then pumps it out by reducing the same space. The capacity of a positive displacement pump is generally in direct proportion to the pump speed, the greater the speed, the higher the pump capacity. The achievable pump head is limited by the available power and is independent of the pump speed.