前言液压系统的大部份故障是由污染造成的。液压系统被污染后,会产生严重后果:元件发生故障,寿命降低;系统性能下降,可靠性差。国外于七十年代就基本解决了此问题。我国过去未予注意,致使液压系统可靠性差、寿命短的老大难问题长期得不到解决。近三年来,全国各行业已普遍开始注意, Introduction Most failures in hydraulic systems are caused by pollution. After the hydraulic system is contaminated, there are serious consequences: component failure, reduced life expectancy, degraded system performance, and poor reliability. Foreign countries basically solved this problem in the 1970s. In the past, our country did not pay attention, resulting in poor reliability of the hydraulic system, short-lived long-term problems can not be solved for a long time. In the past three years, various industries in the country have generally begun to pay attention.