A complete hydraulic system consists of five parts, namely power components, actuator components, control components, auxiliary components, and hydraulic oil. The function of the power component is to convert the mechanical energy of the prime mover into the pressure energy of the liquid, referring to the oil pump in the hydraulic system, which provides power to the entire hydraulic system. The structural forms of hydraulic pumps generally include gear pumps, vane pumps, and plunger pumps. The function of executing components (such as hydraulic cylinders and hydraulic motors) is to convert the pressure energy of the liquid into mechanical energy, driving the load to perform linear reciprocating or rotary motion. Control components (i.e. various hydraulic valves) control and regulate the pressure, flow rate, and direction of liquid in the hydraulic system. According to the different control functions, hydraulic valves can be divided into pressure control valves, flow control valves, and directional control valves Pressure control valves are further divided into relief valves (safety valves), pressure reducing valves, sequence valves, pressure relays, etc; The flow control valve includes a throttle valve, an adjustment valve, a flow divider valve, 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 on-off 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, including various types of mineral oils, emulsions, and synthetic hydraulic oils
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