Hydraulic solenoid Valve is used to control the automation of basic components of the fluid belonging to the actuator; not limited to hydraulic, pneumatic. The solenoid valve used to control the direction of hydraulic flow, the mechanism of the plant by hydraulic cylinder control solenoid valve, so it will be used.

Hydraulic solenoid valve is used to control the fluid pressure, flow and direction of the components in the hydraulic transmission. Control pressure as the pressure control valve controlling the flow referred to as flow control valve to control the pass, breaking and direction as the direction control valve.

A pressure  control valve use is divided into the relief valve, pressure reducing valves and sequence valves.

(1): Relief valve able to control the hydraulic system when the set pressure is reached to maintain a constant state.

Relief valve for overload protection known as the safety valve. When the limit value of system failure, the pressure that may damage the valve port open the overflow, in order to ensure the safety of the system.

(2): Pressure reducing valve depression than the main loop oil and stable pressure control branch circuit. It controls pressure reducing valve can be divided into a fixed value of pressure reducing valve (output pressure to a constant value), fixed differential pressure reducing valve (input and output pressure difference value) and fixed ratio pressure reducing valve (between input and output pressure to maintain a certain percentage).

(3) action after sequence valve: make an actuator (such as hydraulic cylinders, hydraulic motors, etc.), and then the order so that the actuator action. Pump pressure of the first to promote a movement of the hydraulic cylinder, the area A through the sequence valve in the inlet role, when the hydraulic cylinder a movement entirely into pressure, the role of the upward thrust of the area A is greater than the spring adjustment fixed value, the spool rise to the port connected to the inlet and the oil hydraulic cylinder movement.

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