Divided into overflow valve, pressure reducing valve and sequence valve according to the purpose.
1 overflow valve: hydraulic control valve
The control hydraulic system remains constant as 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 reducing valve lower than the main circuit oil pressure. According to the pressure function controlled by it, it can be divided into fixed value pressure reducing valve (output pressure is constant value), and the difference is fixed. Pressure reducing valve (input and output pressure difference is constant) and proportional pressure reducing valve (a certain ratio between input and output pressure).
3 sequence valve: After an actuator (such as a hydraulic cylinder, hydraulic motor, etc.) can be actuated, the other actuators are actuated in sequence.