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What exactly is a positive displacement pump?

April 26, 2017displacement positive pump

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What exactly is a positive displacement pump?

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A positive displacement pump emits a given volume of fluid for each revolution of the motor. Bellows, double-diaphragm, flexible impeller, gear, oscillating, piston, progressing cavity, rotary lobe, rotary vane, and peristaltic pumps are all positive displacement pumps.