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Pumps are categorised into one of three main families; rotary positive displacement, reciprocating positive displacement, and centrifugal.Which pump technology is chosen for an application depends on a variety of reasons: the viscosity of the fluid, type of liquid being pumped, its abrasiveness, temperature and duty point required.

Pumps provide a differential pressure and flow according to their installation. As there are 3 main families of pumps being Centrifugal, Rotary Positive Displacement and Reciprocating Positive Displacement which have different characteristics dependent on the circumstances they face.