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Non-positive displacement has slippage inside the pump and it is a continous, variable flow. But positive displacement has no slippage inside the pump, and it is a constant flow.

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Q: What is the difference between a positive and non-positive displacement pump?
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Difference between positive and non-positive displacement pump?

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.Read more: What_is_a_non-positive_displacement_pump


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