A complete hydraulic system consists of five parts , namely, power components, actuators , control components, auxiliary components and hydraulic oil.

The role of dynamic components is the prime mover of the mechanical energy into fluid pressure energy , refers to the hydraulic system pump, which provides power to the entire hydraulic system. The general structure of the hydraulic pump gear pumps, vane pumps and piston pumps . Action actuators ( such as hydraulic cylinders and hydraulic motors ) the pressure of the liquid can be converted to mechanical energy to drive the load for a reciprocating linear motion or rotary motion . Control elements ( i.e., the various hydraulic valves ) to control and regulate the pressure of the liquid, and the flow direction in the hydraulic system . Depending on the control of the hydraulic pressure control valve into the valve , the flow control valve and the directional control valve. The pressure control valve is divided into relief ( safety valve ) , valves, sequence valves , pressure switch , etc. ; flow control valves including throttle, adjust valves, flow diversion valve , etc. ; directional control valve includes a check valve , check valve , shuttle valve , valve and so on. Depending on the control, hydraulic valves can be divided into switching control valves, control valves and value proportional control valve . Auxiliary components including fuel tanks, filters , tubing and fittings , seals , pressure gauge , oil level, oil temperature meter. Hydraulic oil in the hydraulic system energy transfer medium to work with a variety of mineral oil, emulsified oil, hydraulic molding Hop categories.