The hydraulic power unit can adjust the pressure, flow rate, and direction through the hydraulic pressure of the integrated block, and then transmit them to the oil cylinder or motor through the external connection. This controls the rotation direction, force, and speed of the hydraulic power unit, and drives the hydraulic press to do mechanical work. The structural form of hydraulic stations is mainly distinguished based on the different structures of pump devices, installation positions, and cooling forms.

Control and regulate the pressure, flow rate, and direction of fluids in hydraulic systems. According to different control functions, hydraulic valves can be divided into pressure control valves, flow control valves, and directional control valves. Pressure control valves are divided into relief valves (safety valves), pressure reducing valves, sequence valves, pressure relays, etc; Flow control valves include throttle valves, regulating valves, diversion and collection valves, etc; Directional control valves include one-way valves, hydraulic control one-way valves, shuttle valves, directional valves, etc. According to different control methods, hydraulic valves can be divided into switch type control valves, fixed value control valves, and proportional control valves. Auxiliary components include oil tank, oil filter, oil pipe and pipe joint, sealing ring, pressure gauge, oil level and temperature gauge, etc. Hydraulic oil is the working medium for transmitting energy in hydraulic systems, which includes various types such as mineral oil, emulsion, and synthetic hydraulic oil. A complete hydraulic system consists of five parts, namely power components, actuating components, control components, spare parts, and hydraulic oil.

The hydraulic power unit is mainly used to provide energy to the actuator, mainly the hydraulic pump. The liquid output by it can be supplied to the actuator after passing through certain control and regulation devices (various hydraulic valves) to complete certain actions, such as the extension and contraction of the hydraulic cylinder or the rotation of the hydraulic motor.