Hydraulic power unit Hydraulic station power unit valve block is an important part of hydraulic system, which is used to control the working flow, pressure and direction of hydraulic system. It usually consists of a plurality of valves, including the main control valve, relief valve, throttle valve and so on. The main control valve is the core component in the valve block of the power unit of the hydraulic station, which is used to control the start and stop of the hydraulic pump and the adjustment of the working flow. It usually uses solenoid valves or manual valves to achieve control. The relief valve is used to control the maximum pressure of the hydraulic system. When the system pressure exceeds the set value, the relief valve will open and the excess hydraulic oil will flow back to the tank to protect the system from high pressure damage. Throttle valves are used to control the flow and speed of the hydraulic system. It can control the flow of hydr…