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A hydraulic pump that uses an impeller or propeller to move fluid by momentum, as opposed to a positive displacement pump, which moves discrete quantities of fluid with each rotation. A typical application of a non-positive displacement pump is the coolant pump, or water pump, on a radiator-cooled engine.

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Positive displacement pumps deliver a constant amount of fluid per rotation of the pump shaft, regardless of pressure. Non-positive displacement pumps do not have this characteristic and can vary in flow rate depending on the system pressure. In positive displacement pumps, the fluid is confined in a chamber and discharged with each stroke, while non-positive displacement pumps rely on kinetic energy to push fluid through the system.

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10mo ago
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Q: Difference between positive and non-positive displacement pump?
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