延长液压元件的使用寿命 。 开式油箱顶部应设置空气滤清器以及注油器。空气滤清器的过滤精度应与系统精度要求相符合。空气滤清器的压力损失应不影响液压系统的正常工作。 开式系统：泵所输出的压力油在完成做功任务后从执行驶器返回油箱。应用普遍，但油箱要足够的大。有油缸的系统肯定是开式系统开式系统油箱大，油泵自吸性能好。闭式系统中，液压泵的进油管直

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