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Classification of hydraulic solenoid valves1
Aug 29, 2018

Hydraulic solenoid valves are components used in hydraulic transmissions to control fluid pressure, flow, and direction. The pressure control valve is called a pressure control valve, and the flow control valve is called a flow control valve. The control of the on, off and flow direction is called a directional control valve.

1. Pressure control valves are classified into relief valves, pressure reducing valves and sequence valves according to their purposes.

(1) Relief valve: It can control the hydraulic system to maintain a constant state when the set pressure is reached. The relief valve for overload protection is called a safety valve. When the system fails and the pressure rises to a limit that may cause damage, the valve port will open and overflow to ensure the safety of the system.

(2) Pressure reducing valve: It can control the branch circuit to obtain a stable pressure lower than the oil pressure of the main circuit. The pressure reducing valve can be divided into fixed value pressure reducing valve (output pressure is constant value), differential pressure reducing valve (input and output pressure difference is fixed value) and proportional pressure reducing valve according to the pressure function controlled by it. (Keep a certain ratio between input and output pressure).

(3) Sequence valve: After an actuator (such as a hydraulic cylinder, a hydraulic motor, etc.) can be actuated, the other actuators are operated in sequence. The pressure generated by the oil pump first pushes the hydraulic cylinder 1 to move, and at the same time, the oil inlet of the sequence valve acts on the area A. When the hydraulic cylinder 1 is completely moved, the pressure rises, and the upward thrust acting on the area A is greater than the setting of the spring. After the value, the spool rises to make the oil inlet and the oil outlet communicate, and the hydraulic cylinder 2 moves.

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