在液压系统中,压力异常的故障是经常的现象。压力建立不起来,或压力不足,执行元件就无法工作。这多半是由于油箱油面过低,滤油器堵塞,泵的内漏,溢流阀失灵,阀过于磨损以及液压缸严重串油等原因所致。这些原因一般都易发现,至于系统的压力波动则是由于负载随机与动态变化及泵的自然脉动所造成,可认为是正常现象。系统中压力异常,最严重的是油击现象(俗称压力冲击)。它经常在变向、变压与变 In hydraulic systems, abnormal pressure failure is a frequent occurrence. Pressure can not build up, or lack of pressure, the implementation of components will not work. This is mostly due to the tank surface is too low, the filter clogging, pump leakage, overflow valve failure, the valve is too worn and the cylinder serious string oil and other reasons. These reasons are generally easy to find, as the system pressure fluctuations due to load random and dynamic changes and pump natural pulsation caused by can be considered normal. Abnormal pressure in the system, the most serious is the oil strike phenomenon (commonly known as pressure shock). It is often changing, transforming and changing