DH220-5 DH220-7 main gun relief valve 2420-1225 hydraulic valve

Working principle of the relief valve
The relief valve is a hydraulic pressure control valve. In the hydraulic equipment mainly plays the role of constant pressure overflow, pressure regulation, system unloading and safety protection.
Overflow effect: In the quantitative pump throttling regulation system, the quantitative pump provides a constant flow rate. When system pressure
When it increases, the traffic demand decreases. 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 (the valve port is often opened with pressure fluctuations).
Pressure stabilizing effect: The relief valve is connected in series on the return oil circuit, the relief valve produces back pressure, and the stability of the moving parts is increased.
System unloading function: 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 overflow occurs
The remote control port of the valve passes through the fuel tank, and the hydraulic pump is unloaded at this time. The relief valve is now used as a unloading valve.