"System Unloading: On the solenoid valve of the overflow valve, the solenoid is electrically connected, the removal valve of the overflow valve, the hydraulic pump is unloaded, and the overflow valve is in this time. Unloading valve is used.

Safety protection effect: When the system is working properly, the valve is closed. Only the load exceeds the specified limit (system pressure exceeds the modulation pressure), overload protection, so that the system pressure does not increase (usually the adjustment pressure of the overflow valve is 10% ~ 20% higher than the system working pressure) .

In practice, there are generally: unobstructure, remote pressure regulating valve, as high pressure multi-stage control valve, as a sequential valve, used to generate back pressure

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