Constant displacement pump is a pump that moves a constant, volume of fluid with each rotation. For example, Gear pumps, vane pumps and so on.

A、When the pump turns each rotation, a constant displacement is moved by the constant displacement pump.
B、Constant displacement pump is a pump that moves a constant volume of fluid with each rotation and the pump operates at the constant speed・
C、Constant displacement pump moves a constant volume of fluid and provides a constant output pressure with each rotation.