For the fault of prefill valve occurred in hydraulic system of 50mn trimming press, the causes have been analyzed and eliminating measures put forward.

分析了50 MN切边液压机充液阀脱落、断裂失效的过程和原因，提出了相应的解决措施和充液阀设计应注意的问题。

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Characteristics: meanwhile, welding and equipped with super-high sensitive spark protection device, press the finished product line pressing smooth without oily white, trimming sleek and feel good.

特点：同时熔接并装有超高灵敏火花保护装置，压出的成品压线平滑，不泛白，切边圆滑，手感极佳。

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