Usually, the oil used in a hydraulic system has very little compressibility. And a lot of times its impact is just out of the question. But because low-pressure air is so compressible -- about 10,000 times as much as oil -- even a small amount of air in a system can have a big impact.

If air enters the hydraulic system, some of it will dissolve in the oil. When the pressure of the system decreases, these air bubbles will come out again and form a cavitation phenomenon. In the high pressure area, these air bubbles will be instantly crushed under the action of the pressure oil and be sharply compressed, which will cause a large noise in the system.

On top of that, because the air is compressed, it releases a lot of heat and that creates a local overheating problem, which can damage the hydraulic components and the hydraulic fluid. This is due to the high compressibility of air, which can also cause the actuator to creep, destroy the working stability and, in severe cases, cause the entire system to vibrate.

Of course, once the air into the hydraulic oil, is also very easy to cause the deterioration of the hydraulic oil, so we should pay attention to prevent the air into the hydraulic system, Suggestions from the air into the system, the paper analyses the different reasons, so we at the time of use, need to pay attention to the problem are as follows: 1, regularly check the liquid level height in tank keep its height for; 2, as far as possible to prevent the pressure of the system is lower than the atmospheric pressure, at the same time should ensure that the sealing device performance is good.

Therefore, the upper part of the cylinder should be equipped with corresponding exhaust valve, so that the air entering into the system can be discharged out in time.