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Working principle Unloading relief valve consists of 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. Function and Application: The main function of relief relief valve is to automatically control the unloading or loading of the pump. In view of unloading relief valve function, there is a certain difference between unloading pressure and loading pressure. If the difference is too small, the unloading and loading actions of the pump are too frequent; when the difference is too large, the pressure of the system will change too much. The difference between loading pressure and unloading pressure is an important performance index of unloading relief valve, the general loading pressure is about 85% of unloading pressure. Its performance and relief valve the same. Unloading relief valve main purposes: a. Accumulator system in the automatic unloading pump and loading; b. High and low pressure pump combination of high-pressure low-pressure pump unloading. Production products manufacturers: China mainly Yuci Hydraulic Group Co., Ltd., Beijing Huade Hydraulic Group Co., Ltd., Shanghai Lixin Hydraulic Factory and so on. Foreign countries such as the United States Vickers, Germany Rexroth and other manufacturers. Unloading relief valve Germany use: relief relief valve is mainly used for hydraulic accumulator equipped with Germany, when the accumulator hydraulic pressure reaches the valve set pressure automatically when the hydraulic pump unloading. The valve has a built-in check valve to prevent backflow of pressurized oil in the accumulator. At this point the accumulator to maintain the system of oil and pump unloading to receive energy-saving effect. When the accumulator oil pressure drops to about 85% of the set pressure to the valve, the valve is reloaded, the hydraulic pump to restore the accumulator fluid. This valve can also be used for double pump high and low pressure circuit. At low pressure, both pumps supply oil to the system at the same time, which causes the large pump to unload and isolate it from the high pressure part at high pressure. The pressure drop between the valve and the accumulator for the accumulator must not exceed 10% of the set pressure. Leakage valve drain port back pressure shall not exceed 2% of the set pressure.
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