Water pumps are machines that transport or pressurize liquids.It transmits the mechanical energy of the prime mover or other external energy to the liquid. The large flow gear pump increases the energy of the liquid. It is mainly used to transport liquids including water, oil, acid and alkali liquids, emulsions, suspension emulsions and liquid metals. It can also transport liquids. Liquids, gas mixtures, and liquids containing suspended solids. During the operation of the large-flow gear pump , due to some reasons, the pressure of the local position in the pump drops to the saturated steam pressure (vaporization pressure) of the water at the corresponding temperature, the water starts to vaporize and generates a large number of bubbles, and the bubbles move forward with the water Exercise, when moving to the part with high pressure, it will quickly coagulate and collapse.The generation and collapse process of air bubbles in the water flow in the pump involves physical and chemical phenomena, and generates noise, vibration and erosion of flow-passing parts.This phenomenon is called cavitation in high-flow gear pumps.