Abstract: A new type of hydraulic control system and its application are introduced. Based on analyses of the disadvantages of the normal hydraulic control system, some peculiarities are presented such as the differential flow, servo motor working at adequate speed and constant leak. A repeatability of 0.015% is achieved in the buildup force standard machine with the hydraulic control system. It has great consultant significance for study of build-up force standard machine with it.

Key words: Hydraulic control system, Servo motor, Force standard machine