Hydraulic pumps are positive displacement pumps which pressurize hydraulic fluid in order to do work. They are powered by mechanical energy sources which apply force directly to a movable volume of liquid. Hydraulic pumps are simple pumps, but are able to achieve some of the highest pressures among pump types.
Hydraulic pumps generally operate on the principle of positive displacement. Positive displacement pumps use expanding and contracting cavities to move fluids.
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