Classification of pressure control valves

The Pressure Control Valve is a general term for pressure-generating valves. Divided into use by the overflow valve, Pressure Reducing Valve and Sequence Valve.

1) Relief Valve: It can control the Hydraulic System to maintain a constant state when reaching the set pressure. Relief valves for overload protection are called safety valves. When the system fails and the pressure rises to a limit value that may cause damage, the valve port opens and overflows 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 main circuit oil pressure. Pressure reducing valve according to the pressure function it controls different, it can be divided into fixed value pressure reducing valve (output pressure is a constant value), fixed pressure reducing valve (input and output pressure difference is a fixed value) and constant pressure reducing valve (Maintain a certain ratio between input and output pressure).

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