Hydraulic power unit (HPU) is used as a fuel supply device, it is through the pipeline outside the system with a number of hydraulic cylinder is connected to control a plurality of valve action. The oil tank, the oil pump and the energy storage power oil source system is composed of independent and sealed. Oil station can be equipped with PLC control system, it controls all the functions of internal hydraulic pressure and produce a signal and the control room (DCS) exchange. Control components such as the hydraulic servo valve is directly arranged on a hydraulic oil cylinder, through this valve to the pressure oil pressure into the cylinder, or the release of high pressure oil from the. Under normal circumstances, the pump oil to the system, automatically to keep the system rated pressure, through the locking control valve, the goal of preserving the valve position function in any position; in the working state, the hydraulic actuator is controlled by the electromagnetic valve, the electromagnetic valve action system command signal, control and hydraulic accumulator of energy release, and then control cylinder slide valve, through mechanical transmission mechanism to drive the valve, the implementation of fast closing, the normal opening and closing control and test. High pressure oil cylinder can be fixed on the valve rod, and can also be directly used as actuator. The excess returns of hydraulic oil hydraulic oil station, an oil inlet pipe of a return pipe can control several parallel connected with this valve piping system. This actuator having action is used to control the main steam valve and steam turbine bypass system of special hydraulic driving technology station. Power unit designed for various application status of optimization design, for example, can be used in truck harsh environment operation, or long time for heavy handling conditions, and other needs of high performance and high quality products for the occasion.