TY - Front. Mech. Eng. A1 - Qiang GAO, Yuchuan ZHU, Changwen WU, Yulei JIANG T1 - Development of a novel two-stage proportional valve with a pilot digital flow distribution Y1 - 2021-06-15 JF - Frontiers of Mechanical Engineering JO - Front. Mech. Eng. SP - 420 EP - 434 VL - 16 IS - 2 UR - https://journal.hep.com.cn/fme N1 - 10.1007/s11465-020-0622-2 ER -