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Why positive displacement pump is called positive displacement?


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April 28, 2012 6:38PM

replacing equal quantity of liquid from cavity is called positive displacement. let understand it by an example :

lets assume you fill a bath tube up to the very top - there is no room for anything else. Then step in the bath. What happens? Water flows over the sides onto the floor - right? That is positive displacement! The amount of water that comes out is exactly the volume of your foot and leg.