一般来说，气液增压缸在使用半年至一年时间或加工次数达到500000次后，还有就是当液压油由清亮透明变的混浊或成乳白色时，就说明要更换液压油了。加液压油的时候，注意不要高于或者低于油标线的范围，当液压油超过上会造成液压油吐出现象。
Generally speaking, when the gas-liquid booster cylinder is used for half a year or after the processing times reach 500000 times, and when the hydraulic oil changes from clear and transparent to turbid or milky white, it means to replace the hydraulic oil. When adding hydraulic oil, pay attention not to be higher than or lower than the range of oil mark, when the hydraulic oil exceeds the upper limit, it will cause the phenomenon of hydraulic oil spitting out.
液压油选用要求
Hydraulic oil selection requirements
一般来讲，液压油应满足以下方面：
Generally speaking, hydraulic oil should meet the following requirements:
1、合适的黏度等级。
1. Suitable viscosity grade.
2、纯净，少杂质。
2. Pure, less impurities.
3、具有良好的润滑性、相容性和稳定性。
3. It has good lubricity, compatibility and stability.
4、具有良好的抗乳化性、抗泡沫性、抗腐蚀性及防锈性。
4. It has good emulsification resistance, foam resistance, corrosion resistance and rust resistance.
5、体膨胀系数低，比热容高。
5. The volume expansion coefficient is low and the specific heat capacity is high.
6、流动点和凝固点低，燃点和和闪点高。
6. The flow point and freezing point are low, while the ignition point and flash point are high.
7、性价比优。对人体有害性低。
7. Cost effective. It is not harmful to human body.
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