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浙江大学液压教研室教师路甬祥,1979年夏初到W.Backé教授领导的西德阿亨工业大学液压气动研究所做研究工作。结合西德的技术条件,路甬祥构思并实验了电液先导比例控制的新原理,新型元件的静、动态性能都提高了一个数量级,在比例控制技术方面取得了突破性的进展。路甬祥与Backé教授联名于1979年冬和1980年春先后两次在西德申报了四项发明和专利:“带二通嵌入阀的与负载无关的电液体积流量调节装置”、
Zhejiang University Hydraulic Research Department teacher Lu Yongxiang, early summer 1979 to W.Backé Professor West Germany Acheng Institute of Technology Institute of Hydraulic and pneumatic research work. In combination with the technical conditions of West Germany, Lu Yongxiang conceived and experimented on the new principle of electro-hydraulic pilot proportional control. The static and dynamic performance of the new type element increased by one order of magnitude, and breakthroughs were made in the aspect of proportional control technology. Lu Yongxiang and Professor Backé jointly declared four inventions and patents twice in the West Germany during the winter of 1979 and the spring of 1980: “The load-independent electrohydraulic volume flow regulator with two-way inlay valve”