This paper deals with the thorough analysis of direct digital direction control valve(DDDCV),and proposes the design criterion for optimal parameters of its piloted stage and the selection method of step motor as well as some other parameters.

• 本文对直接数字式方向流量控制阀进行了深入分析，提出了其先导级最佳参数的设计准则和步进电机及其它参数的选择方法。