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介绍了E40M电液控制装置的结构、工作原理及存在的问题；阐述了用比例伺服阀取代喷嘴挡板阀的改造方案及所取得的效果。
The structure, working principle and existing problems of E40M electro-hydraulic control device are introduced. The modification scheme and the effect of replacing the nozzle flapper valve by proportional servo valve are expounded.