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How to Prevent Cavitation?

June 01, 2019

Although there are many factors could cause cavitation, cavitation can also be avoided if we take effective measures to prevent it.

(1) Use High Quality Hydraulic Oil

Choose high quality hydraulic oil according to the related oil standard, because qualified oil can effectively prevent the formation of air bubble. Keep the hydraulic system as clean as possible, and regularly inspect the oil quality, oil level and oil color. Whenever water bubbles or foams occur in the hydraulic oil, please work to find the air source and then eliminate it.

(2) Prevent the Oil Temperature from Being too High so as to Reduce Hydraulic Shock

Reasonable design of the cooling system is key to maintaining normal temperature of hydraulic oil. In addition, smoothly operate hydraulic joystick, distribution valve and thrust lever, in order to minimize hydraulic oil's impact on the hydraulic components. Furthermore, timely maintain the cooling system so as to keep its temperature within certain boundaries, thus reducing the energy caused by the collapse of air bubbles.

(3) Maintain the Normal Clearance between Joint Surfaces of Hydraulic Components

When manufacture or repair main components of the hydraulic cylinder (like cylinder block, piston rod), please assemble them according to the lower tolerance limit of mounting dimensions, which can greatly reduce cavitation. If cavitation occurs in hydraulic components, utilize metallographic sandpaper polishing technique to remove cavitation pitting and surface carbon deposit.

(4) Pay Attention to Air Discharge during Maintenance

After maintenance, the hydraulic system should be operated for a while so that the hydraulic oil in the system can fully circulate. If necessary, disassemble the oil inlet pipe or return pipe so as to let the oil spill out of it, thus achieving air discharge of single cylinder.