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液压系统中,溢流阀有直动式和先导式两种,其主要作用是溢流、稳压和限压。直动式溢流阀结构简单,故障原因容易找到,本文不作分析。现结合实际工作中的故障实例,对先导式溢流阀常见的故障及原因进行分析,并给出相应的处理方法。 一、系统无压力 1.故障实例 WY100液压挖掘机工作油路采用双泵供油系统。右泵高压油经溢流阀进入后阀组,该阀组控制回转马达、铲斗缸、右行走马达及辅助泵的动作。溢流阀调定压力为26.5MPa。机车工作时出现回转马达、铲斗缸、右行走马达等同时无动作。检查各执行装置进油管,压力表上显示无压力。拆检溢流阀,发现主阀芯阻尼孔堵塞,疏通清洗后机车恢复正常。
Hydraulic system, the relief valve has a direct-acting and pilot-based two kinds, its main role is to overflow, voltage regulator and pressure. Direct acting relief valve structure is simple, easy to find the cause of the malfunction, this article is not for analysis. Now with the actual work of the failure examples, the pilot relief valve common failures and causes analysis and gives the corresponding treatment. First, the system has no pressure 1. Fault Example WY100 hydraulic excavator hydraulic dual-pump oil supply system. Right pump high pressure oil through the relief valve into the rear valve group, the valve control swing motor, bucket cylinder, right travel motor and auxiliary pump action. Relief valve setting pressure of 26.5MPa. When turning locomotive motor, bucket cylinder, right-hand travel motor at the same time without action. Check the implementation of the device into the tubing, pressure gauge showed no pressure. Check the relief valve and found that the main spool orifice clogging, clear the locomotive back to normal after cleaning.