中文摘要：

对先导零遮盖型2D伺服阀性能进行研究。首先对先导零遮盖型2D伺服阀的零位泄漏量进行了理论分析。在建立阀芯直线位移对阀芯转角关系的基础上对先导零遮盖型2D伺服阀的动态特性进行了仿真分析。最后，为了验证理论分析的正确性，设计试制了一个7MPa压差下300L／min的零遮盖2D伺服阀，进行了零位泄漏量测试和动态响应测试。实验结果表明，在压力21MPa，先导零遮盖型2D伺服阀零位泄漏量为0．6L／min，先导零遮盖型2D伺服阀的阶跃响应的上升时间约为7ms。理论分析和实验结果均表明先导零遮盖型2D伺服阀具有良好动态性能，并且其零位泄漏量很小。

英文摘要：

A 2D servo valve with zero-overlap was proposed. The pilot leakage of the 2D servo valve with a zero-overlap of pilot stage was analyzed theoretically. Based on the analysis to the flow field of the clearance between two parallel plates, the overall pilot leakage was calculated through integration. The mathematical model of the axial motion of the spool in respect to rotary motion was established and the dynamic response of 2D servo valve was investigated by simulation. To validate the analysis, the prototype of a 2D valve with flow capacity of 300L/min （ at 7MPa） was fabricated and the pilot leakage and the actual step response were measured. The results of the experiment show that the pilot leakage is about 0. 6L/min at 21MPa and the response time for the step input is 7ms. It is concluded from both theoretic analysis and simulation that the 2D servo valve with a zero-overlap of pilot stage has a fairly fast dynamic response, and its pilot leakage is very small.