The governing system of HP steam and extraction steam determines the condition of turbine load control system. Except the electrical system, there are other factors to affect stability of governing system, such as hydraulic actuator jamming, the lever problem, etc. according to the requirements of the mechanical drive unit, our company can design various hydraulic parts to satisfy mechanical strength & stiffness. In order to improve mechanical driving performance, it is advisable to increase the cross-sectional area and lengthen the hydraulic actuator travel, which will be useful for strengthening drive force.