What is positive-displacement (PD) pumps?
By definition, positive-displacement (PD) pumps displace a known quantity of liquid with each revolution of the pumping elements. This is done by trapping liquid between the pumping elements and a stationary casing. Pumping element designs include gears, lobes, rotary pistons, vanes, and screws. PD pumps are found in a wide range of applications — chemical-processing; […]
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