Introduction to the working principle and main purpose of the unloading relief valve

working principle
    The unloading relief valve consists of a relief valve and a 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 closing pressure of the relief valve, the relief valve closes and the pump is loaded to the system. The pressure at which the pump is unloaded is referred to as the unloading pressure, and the pressure at which the pump is loaded is referred to as the loading pressure.
    Function and application: The main function of the unloading relief valve is to automatically control the unloading or loading of the pump. In view of the utility of the unloading relief valve, there is a certain difference between the unloading pressure and the loading pressure. If the difference is too small, the pump unloading and loading action is too frequent; if the difference is too large, the system pressure changes too much.
    The difference between the loading pressure and the unloading pressure is an important performance index of the unloading relief valve. The general loading pressure is about 85% of the unloading pressure. Its performance is the same as the relief valve.

    The main purpose of the unloading relief valve:
    a. automatic unloading and loading of the pump in the accumulator system;
    b. Unloading of large flow low pressure pumps in high and low pressure pump combinations.

    Production products manufacturers: Domestically, Yuci Hydraulic Group Co., Ltd., Beijing Huade Hydraulic Group Co., Ltd., Shanghai Lixin Hydraulic Parts Factory, etc. There are American Vickers, German Rexroth and other manufacturers abroad.
    Unloading relief valve selection: The relief relief valve is mainly used in the hydraulic circuit with accumulator.