- A pump that moves a constant volume of fluid in each rotation. Some form of pressure relief valve or pressure regulator is used with a constant-displacement pump. Gear pumps, vane pumps, and gerotor pumps are some of the constant-displacement pumps. See fixed-displacement pump.
Aviation dictionary. 2014.
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fixed-displacement pump — One whose output volume is uniform on each repetitive cycle. Some form of pressure regulator or relief valve must be used with a fixed displacement pump when it is driven by an aircraft engine. See constant displacement pump. Fixed displacement… … Aviation dictionary
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