中文摘要：

电液比例方向阀是矿用装备液压系统的重要组成元件,用于精确控制设备执行机构的运动速度和方向。论文介绍了现使用比例方向阀的工作原理及特点,并在此基础上提出改进,改进设计的比例方向阀运用位移-先导流量反馈原理,改进后阀具有结构简单,能量损失小,加工难度低的特点。

英文摘要：

The electro-hydraulic proportional direction valve is the main component of mine equipment hydraulic system.It is mainly used for precise control to speed and direction of the mechanism. This paper introduces the working principle and characteristics of the present proportional direction valve.The improved design of a proportional directional valve is using displacement-flow feedback principle. And the improved valve has more characteristics,such as simple structure,small energy loss and low processing difficulty.