When we are in discussion to the hydraulic system, we have to understand the transmission medium of hydraulic system, hydraulic oil.
In the hydraulic system, it is understood that the hydraulic oil plays a vital role. First is the hydraulic oil itself is used as the transmission medium pressure system. Is the conversion mechanical and hydraulic pump pressure can convert again by pressure components of the bridge of doing work. And it also has the lubrication of hydraulic components. Of course in the hydraulic oil in hydraulic system are both the heat dissipation, to prevent rusting element, the important role of separation and precipitation of soluble pollutants. So when we are in the use of hydraulic machinery, we will give full consideration to the relevant characteristics of the hydraulic oil.
In the daily operation process of hydraulic machinery we mainly consider the following characteristics of the hydraulic oil:
1. The hydraulic oil viscosity-temperature characteristics:
Its main relationship is when the temperature of hydraulic oil, the liquid viscosity decreased, because of the liquid molecules increase, and vice versa.
2. The pressure of the hydraulic oil and liquid relationship is also important on the one hand, the basic relationship is when the hydraulic oil pressure also increases the viscosity, because the liquid molecular cohesion will increase, and vice versa.
2. Another important feature is the compressibility, we will consider two important liquid compression coefficient of compressibility and liquid bulk modulus of elasticity, which for us in the design of hydraulic system and hydraulic system piping layout is a very important consideration at the same time when our customers choose when buying a hydraulic machinery is also a very important reference.
Then we in daily work should be how to choose the hydraulic oil? Should consider those factors?
1. Working conditions should be fully considered
When the temperature of the working environment is high, we should choose the hydraulic oil with high viscosity, and vice versa. In the damp places we should consider the hydraulic oil with rain and hydrolytic resistance and environmental protection of the hydraulic oil.
2. Consider working conditions: if high hydraulic pressure of the system operation, then choose hydraulic oil of high viscosity, and vice versa. When the temperature of the working conditions is low, be about to choose the hydraulic oil of high viscosity, because it can reduce the leakage of hydraulic system in operation.
3. Of course we have to choose the hydraulic oil with low purchase price and maintenance costs.
Believe that when we understand the basic knowledge of hydraulic oil, in the future we use hydraulic machinery, can be targeted.