原文：
随着注塑机液压系统朝着 中、高压方向发展，先导型溢流阀广泛地应用在注塑机液压系统的控制油路中。 在使用实践中，为{zd0}限度地发挥其效能，保护 控制系统，准确、及时地诊断、排除先导型溢流阀的故障是关键的一环。先导型溢流阀失灵，会造成 注塑机不能动作。根据现象，分析其原因有：先导阀阀芯弹簧折断； 阴尼孔堵塞；先导阀阀口密封不良；主阀芯卡死等。相应的排除措施是：更换或在折断处加平垫以应急使用；清洗疏通；研磨或将该油路断路以应急使用 ；研磨、清洗。 限压不稳：先导型溢流阀限压不稳，表现为液压系统压力偏低或偏高，液压执行元件动作无力或油管、泵体、阀体爆裂。造成此 故障的原因有：压力调整不当；先导阀阀芯弹簧弯曲或变软；油液过脏或油液流动不畅。相应的排除措施是：重新调整；校正、加垫或更换；更换、清洗。先导型溢流阀限压不稳为渐发性故障，先导型溢流阀失灵为突发性故障，在排除完故障后，应按注塑机系统所限定的压力对先导型溢流阀控制的压力重新进行调整。

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译文：
With the injection molding machine hydraulic system moving in the direction of the development of high-pressure, pilot relief valve is widely used in injection molding machine control circuit in the hydraulic system. The use of practice, as to maximize its effectiveness, protection and control system, accurate and timely diagnosis, excluding the pilot-type relief valve failure is the key part. Pilot-based relief valve failure, will result in injection molding machines can not move. According to the phenomenon, analysis of reasons: the pilot valve spool spring break; damping hole plug; pilot valve port seals bad; the main spool stuck so. Exclude the corresponding measures are: replacement of broken office or in the flat pad for emergency use increases; clean dredge; grinding or the oil circuit breaker to emergency use; grinding, cleaning. Voltage instability limit: limit pressure relief valve Pilot-type instability, manifested as low or high pressure hydraulic systems, hydraulic actuators action unable or tubing, pump, valve burst. Reasons causing the failure: improper pressure adjustment; pilot valve spool spring bend or soften; oil too dirty or poor oil flow. Corresponding exclusion measures: re-adjustment; correction, plus pad, or replaced; change, clean. Pilot-type uncertainty is gradually limited pressure relief valve failure issued, pilot relief valve failure for the unexpected failure of the exclusion of complete failure, the injection molding machine system should be limited to the pressure relief valve on the pilot-based control pressure to re-adjust.