中文摘要：

阐述了一种新型本安型电液换向阀的工作原理，采用了2D阀的技术，在本安型双向电磁铁与双自由度阀芯之间引入双向压扭联轴器。正常压力情况下，电磁铁输出的推（吸）力通过压扭联轴器使阀芯转动，由液压力差推动阀芯轴向移动，实现换向功能。本质安全技术作为低功率的设计技术，限制了本安型电磁铁的输出的推力，而压扭联轴器不仅可以实现位移-旋转的运动转换，还可以将电磁铁的驱动力放大，使其能有效、可靠地驱动阀芯运动，从而提高本安型换向阀的可靠性。通过对本安型二维（2D）电液换向阀实验研究，测得其启、闭特性，表明在一定压力范围内，本安型2D电液换向阀不仅可以克服液动力和摩擦力的不利影响，还具有较快的响应速度和稳定性。

英文摘要：

The working principal of a new intrinsically safe Electro-hydraulic Directional Valve are demonstrated. Using the 2D valve technology,the two-way compression-torsion coupling is introduced between the intrinsically safe two-way electromagnet with two degrees offreedom spool. Under the normal working pressure, the magnetic force of the solenoid rotates the spool through the compression-torsion couplingand the hydrostatic imbalanced force pushes the spool axial movement to realize reversing function. Intrinsic safety technology as alow power design technology, limiting the thrust of the intrinsically safe type electromagnet, and compression-torsion coupling can not onlyrealize displacement rotation conversion, but also realize function of driving force amplification, so that it can effectively and reliably drivespool movement, so as to improve the reliability of the intrinsically safe directional valve. Through the intrinsically safe two-dimensional(2D) electro-hydraulic valve experimental study measured the opening and closing characteristic, show that 2D intrinsically safe electro-hydraulicdirectional valve can not only overcome the adverse effects of hydrodynamic force and friction force, but also has faster respondingspeed and stability under a certain pressure.