一、前言溢流阀是液压系统的重要部件之一。在工作中由于溢流阀的故障也会带来整个系统的故障。而溢流阀导阀其性能上要求锐边密封，再加上工况恶劣，因而其导阀易产生磨损失效。本文从YF—L20B型先导溢流阀为例，对其磨损的振动诊断进行了探讨，得出了利用振动信号诊断导阀磨 First, the foreword relief valve is one of the important components of the hydraulic system. In the work due to the relief valve failure will bring the entire system failure. The relief valve pilot valve performance requirements sharp edge seal, coupled with harsh working conditions, and therefore easy to produce its pilot wear failure. This article from YF-L20B-type pilot relief valve, for example, the vibration of its wear diagnosis were discussed, the use of vibration signal diagnosis pilot valve mill