Achieving constant pressure and flow in hydraulics, or constant current and voltage with electricity, aren't as straightforward as they may seem. Ideally, positive-displacement pumps generate flow that is independent of outlet pressure. The lower the internal leakage, the less the pump's flow reacts to changing out-let Pressures. In fact, a textbook positive-displacement pump would have no internal leakage and exhibit no reaction to changes in outlet pressure.
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