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对带有电液比例方向控制阀的定位机车液压系统的工作性质、典型回路、工作原理进行了分析，对分析和设计同类电液比例控制系统具有借鉴意义。
The working characteristic, typical circuit and working principle of locomotive hydraulic system with electro-hydraulic directional control valve are analyzed. It has reference significance for the analysis and design of similar electro-hydraulic proportional control system.