Because the flow medium (hydraulic oil) has different flow rates in various parts during the flow, there is a certain internal friction inside the liquid, and there is also friction between the liquid and the inner wall of the pipeline, which causes the temperature of the hydraulic oil to rise. High reason. An increase in temperature will result in increased internal and external leakage, reducing its mechanical efficiency. At the same time, due to the higher temperature, the hydraulic oil will expand, resulting in increased compressibility, so that the control action can not be transmitted well.

In fact, heat is an inherent feature of hydraulic systems, and it cannot be eradicated and can only be minimized. The use of good quality hydraulic oil and hydraulic piping should avoid the occurrence of elbows, use high quality pipelines, pipe joints, hydraulic valves, etc.

The vibration of the hydraulic system is also one of its ailments. The impact due to the high-speed flow of hydraulic oil in the pipeline and the shock generated during the opening and closing of the control valve are the causes of vibration of the system. Strong vibrations can cause errors in system control actions, and can cause errors in some of the more sophisticated instruments in the system, resulting in system failure. Solution: Hydraulic lines should be fixed as much as possible to avoid sharp bends. Avoid changing the direction of the flow frequently. If it is unavoidable, you should take measures to reduce the vibration.

The entire hydraulic system should have good vibration damping measures, while avoiding the influence of external vibration sources on the system.

The leakage of the hydraulic system is divided into internal leakage and external leakage. Internal leakage means that the leakage process occurs inside the system, such as leakage on both sides of the hydraulic cylinder piston, leakage between the control valve spool and the valve body. Although internal leakage does not cause loss of hydraulic oil, due to leakage, the established control action may be affected until a system failure occurs. An external leak is a leak that occurs between the system and the external environment. Direct leakage of hydraulic oil into the environment, in addition to affecting the working environment of the system, can also lead to insufficient system pressure to cause failure. There is also a risk of fire from hydraulic oil leaking into the environment. At this time, the seals with better quality are used to improve the processing precision of the equipment.