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针对液压泵、液压马达等液压元件在试验过程中，经常由于被试液压元件及进出油路被污染而导致插装式方向阀或插装式主阀的阻尼孔堵塞，难以实现系统加载的问题，介绍一种用于试验前的试验系统自清洁的污染控制技术。
For the hydraulic pump, hydraulic motor and other hydraulic components in the test process, often because of the test hydraulic components and access to oil pollution caused by the plug-type directional valve or plug-in main valve damping orifice clogging, the system is difficult to achieve the problem of loading , Introduces a self-cleaning pollution control technique for a test system prior to testing.