This paper not only discusses all kinds of the loading forms and system efficiency of the life test bed for hydraulic elements, such as oil pump, oil motor and oil crock.
本文对油泵、油马达、油缸寿命试验台的各种加载形式及系统效率进行了分析，并导出了各种加载形式系统效率的一般表达式。
Rolling oil filter system is the mature final product, free-maintains system. The filter core has the long life.
轧制油过滤系统是比较成熟的产品，完全可以实现系统免维护和滤芯长寿命。
The moisture content in hydraulic oil is a harmful pollutant of serious consequence. It impacts substantially on the reliability of hydraulic system and the operation life of the components.
水分是液压油中一种危害较大的液体污染物，严重地影响液压系统的可靠性及液压元件的使用寿命。
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