What principle does the Rotary Vane pump utilize?

The principle utilized by the Rotary Vane pump revolves around a rotor that is mounted off-center within the housing. This design creates a chamber that expands and contracts as the rotor turns. As the rotor spins, the vanes extend outward due to centrifugal force, forming varying volume pockets that trap and move water from the inlet to the outlet. This off-center rotation is critical because it allows for consistent suction and discharge, ensuring efficient movement of fluid. This mechanism utilizes both the motion of the rotor and the positioning of the vanes to achieve effective pumping action, which is characteristic of rotary vane pumps.

The other options describe mechanisms that do not match the operational principles of rotary vane pumps, highlighting the uniqueness of the design in terms of how fluids are managed within the system.