中文摘要：

由于摩擦力、液动力等因素的影响,直动式电液比例换向阀很难实现大流量控制,而导控式比例换向阀无法实现零压下工作,针对直动式和导控式电液比例换向阀的缺点,提出了一种结构简单、流量大并具有全桥式位置反馈的新型电液比例换向阀——2D数字式电液比例换向阀。该阀由2D换向阀、压扭联轴器和比例电磁铁等组成。在分析该阀的结构和工作原理基础上,对该阀进行了动态试验。实验表明：2D数字式比例换向阀频宽可达18 Hz,具有良好的动态特性。

英文摘要：

Due to friction, fluid power and other factors, the direct-acting electro-hydraulic proportional flow control valve is difficult to achieve large flow control, and the guidance and control proportional valve can not achieve zero pressure work. To disadvantages of the direct-acting controlled electro-hydraulic proportional valve, we put forward a new electro-hydraulic proportional valve with a simple structure and a large flow and a full bridge position feedback - 2D digital electro-hydraulic proportional valve. The valve consists of a 2D valve, a pressure torsion coupling and proportional solenoids and other components. In the analysis of the structure and working principle of the valve on the basis of this study, the dynamic test of valve is done. Experimental results show that： the 2D digital proportional valve＇s bandwidth is up to 18 Hz, so this valve has good dynamic characteristics.