Positive Displacement Pump

Question...

Why the name comes positive displacement pump?

Pumps like vane pumps, gear pumps are cumulatively named as positive displacement pump why it is named so?

Answers...

Answer by JOHNNIE B
The piston positively displaces the oil or water .

Answer by dattatraykolte
positive displacement means displacement or discharge or work will be always on the positive side of displacement(motion)

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