In centrifugal pumps, spray solution enters through the center of a rotating impeller that's driven at speeds up to 6000 RPM. Spray solution is forced to the outer edge of the housing. This centrifugal force is what delivers the liquid to the nozzle. Traditionally thought of as low-to-medium pressure pumps (0-180 psi) centrifugals can deliver high flow rates (up to 190 GPM). Because centrifugals have minimum surfaces to wear and no valves, they are very durable, easy to maintain and well suited for pumping abrasive and corrosive materials. Dry running of centrifugals should be avoided.
Because centrifugal pumps operate at higher speeds, the PTO speed must be increased through a speedup gear drive or belt/pulley drive or driven by a gas or a high speed hydraulic motor.