A rotary direct drive servovalve working principle was described. The servovalve structure and usage of improvement design before and after were introduced, and comparative tests were done in laboratory. It is verified that the improved servovalve has reasonable structure and better performance.%简介某型旋转直接驱动伺服阀工作原理，介绍该型号阀改进设计前后的结构和使用状况，并在实验室对该型阀进行改进设计前后对比试验，验证改进设计后，该型号阀结构更加合理，性能更能满足系统要求。
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