Cavitation is a term used to describe the formation of cavities in liquids. In hydraulic systems, this usually refers to the formation of bubbles in the oil, but it also means that dissolved air is separated from the oil. Cavitation occurs when the pressure of cavitation in oil changes dramatically near the metal surface. In hydraulic system, the formation of air cavity is usually (but not always) related to the existence of vacuum (negative gauge pressure). Moreover, compared with the bubble implosion caused by pressure, the mechanical force caused by vacuum causes much more damage to the hydraulic components. How many different causes of cavitation in hydraulic systems can you suggest? Here are 17 of them: 1.The oil suction filter is blocked 2.Wrong fluid viscosity 3.Fluid temperature too low 4.Fluid temperature too high 5.Air filter clogging 6.The inlet pipe diameter of the pump is too small 7.The inlet area of pump suction pipe is too small 8.Pump mounting position too high 9.The installation distance between pump and oil tank is too long 10.Pump drive shaft speed too high 11.Pump rotation speed too high (variable displacement unit) 12.There are too many elbows in the oil inlet pipe of the pump 13.High turbulence caused by inlet line shut-off valve 14.Shrinkage deformation of pump inlet pipe hose 15.Other constraints that may be caused by the pump inlet pipe 16.Cavitation or load control valve failure or incorrect adjustment 17.The pressure gradient drops too much and the working pressure is too fast
Whatever the cause, cavitation will damage the long-term reliability of any hydraulic system. This means that tolerating it is a costly mistake.