CAVITATION (CAV-UH-TAY-SHUN)

The formation and collapse of a gas pocket or bubble on the blade of an impeller or the gate of a valve. The collapse of this gas pocket or bubble drives water into the impeller or gate with a terrific force that can cause pitting on the impeller or gate surface .Cavitation is accompanied by loud noises that sound like someone is pounding on the impeller or gate with a hammer.