Positive displacement pumps

Positive displacement pumps

Positive displacement pumps are used when a centrifugal pump can no longer be used. For example, due to high medium viscosity and / or specific weight, specific suction conditions, the desire for accurate dosing, high pressures, etc.

The working principle of the positive displacement pump (alternately increasing and decreasing the pump space / cylinder) is best illustrated by the operation of a single-acting piston pump shown below;

However, there is an overlap between the applicability of centrifugal pumps and positive displacement pumps, where there is the possibility that, if misjudged, a positive displacement pump may be used while a centrifugal pump would have been more appropriate. In this case, too, a correct selection can save a lot of money and maintenance. So inquire about the possibilities at IB-Pompen.

A distinction is made between rotary and oscillating positive displacement pumps. Piston, plunger and diaphragm pumps are oscillating positive displacement pumps. The other types of positive displacement pumps, including gear pumps, worm pumps, vane pumps, eccentric worm pumps, flex impeller (impeller) pumps, lobe pumps / circumferential piston pumps, double screw pumps and sine pumps, fall under the rotary positive displacement pumps.