The basic concept Unloading valve is under certain conditions, can make the hydraulic pump unloading valve. Unloading valve and relief valve Unloading valve is usually a two-way two-way valve (often solenoid valve) relief valve, the function is not used when unloaded to set the system (pump) the main pressure, when the unloading State (by two two-way valve action conversion) pressure oil directly back to the tank, the system pressure value of 0. In order to achieve some of the loop control and improve pump life, reduce power consumption. In the loop are merged into the loop. Pressure reducing valve used to adjust the pressure required for the implementation of components is in series in the loop, the general can not be used interchangeably. Unloading valve works Unloading relief valve by the relief valve and check valve. When the system pressure reaches the opening pressure of the relief valve, the relief valve opens and the pump unloads. When the system pressure drops to the relief pressure of the relief valve, the relief valve is closed and the pump is loaded to the system. When the pump unloading pressure is called unloading pressure, the pump is in the state of loading pressure is called the loading pressure.
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