Abstract
Positive displacement pumps are classified as reciprocating or rotational pumps, depending on the nature of the movement of the pressure-producing elements. Positive displacement pumps work by forcing a liquid via a machine-driven device, such as a plunger or a piston. This chapter is about positive displacement pumps used in manufacturing plants to transport liquid from low elevation or low pressure to high elevation or pressure. Piston or plunger and diaphragm pumps are different reciprocating pumps, while eccentric rotor, gear, and screw pumps are rotary pumps. Positive displacement pumps are employed in almost every process facility in the industrialized world depending on their application.
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