在实际工作中,由于维修人员对液压系统的液压介质及元件的工作机理了解不够,因误用、误拆造成机械或部件损坏的事例不少。液压机械各执行机构出现动作无力的原因往往是因系统失压所致,造成系统失压通常有3种原因: 1.溢流阀阀芯打开后无法复位 液压油路若负载过重,可通过溢流阀卸载对系统起到安全保护作用。溢流阀阀芯动作时,若介质中含有杂质(如损坏的橡胶密封件的残渣等),或因开度过大、过猛而造成阀芯发卡无法复位时,将使整个油路系统卸 In practice, due to maintenance staff of the hydraulic system hydraulic components and components of the working mechanism is not enough, due to misuse, mis-removal caused by mechanical or parts damage a lot of cases. The reason for the weakness of hydraulic actuators is often due to system pressure loss, resulting in system pressure loss are usually three kinds of reasons: 1. Relief valve spool can not reset the hydraulic circuit If the load is too heavy, by Relief valve unloading system to play a security role. Overflow valve spool action, if the medium contains impurities (such as damaged rubber seals, etc.), or because the opening is too large, too much and cause the spool can not be reset, it will make the entire oil system unloading