Positive displacement pumps (PD) 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, hose, diaphragms, vanes, and screws.
PD pumps are found in a wide range of applications chemical processing; liquid delivery; marine; biotechnology; pharmaceutical; as well as food, dairy, and beverage processing.
Their versatility and popularity is due in part to their compact design, high- viscosity performance, continuous flow regardless of differential pressure, and ability to handle high differential pressure.
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