Hydraulic balance valve Excavator hydraulic cylinder valve core CBEL-LJN

Action of relief valve:

(1) Constant pressure overflow effect
In a fixed pump throttling control system, the fixed pump provides a constant flow. When the system pressure increases, the flow demand will decrease. At this time, the relief valve is opened, so that the excess flow flows back to the tank, to ensure that the relief valve inlet pressure, that is, the pump outlet pressure is constant.
(2) The pressure regulating effect of the relief valve produces back pressure, and the stability of the moving parts is increased.
(3) System unloading effect
The remote control port of the relief valve is connected to the solenoid valve with a small overflow flow. When the electromagnet is energized, the remote control port of the relief valve is open
Oil tank, hydraulic pump unloading at this time. The relief valve is now used as a unloading valve.
(4) Safety protection
When the system is working normally, the valve is closed. Only the load exceeds the specified pole to open the overflow, overload protection, so that the system pressure no longer increases.
(5) In practical applications, there are generally
As a unloading valve, as a remote pressure regulator, as a high and low pressure multistage control valve, as a sequence valve, used to produce back pressure.
(6) The relief valve generally has two structures
① Direct acting relief valve
② Pilot operated relief valve
(7) The main requirements for the relief valve
Large pressure regulation range small pressure deviation, small pressure oscillation, sensitive action, large overload capacity, small noise.