Unloading Relief Valve works with the primary purpose

 Unloading relief valve formed by the relief valve and one-way valve. When the system pressure to reach the opening pressure relief valve, relief valve opens, pump unloading; When the system pressure dropped to the closure of pressure relief valve, relief valve closed, pump to the system load. Unloading the pump when the pressure is called unloading pressure, so that the pressure pump in a loaded condition is called load pressure.

     Functions and Applications: The main function of unloading relief valve is the automatic control of pump unloading or loading. In view of the function of unloading relief valve to require unloading pressure and there are some differences between the load pressure. The difference is too small, then the unloading and loading pump action too frequently; the difference is too large, the system changed so much pressure.

     Load pressure and the pressure difference between unloading unloading relief valve is an important performance indicators, the general pressure loading unloading pressure of about 85%. The same as with the relief valve performance.

     Unloading relief valve of the main purposes:

     a. Accumulator pump system automatically unloading and loading;

     b. combination of high and low pressure pump high flow low pressure pump unloading.

     Manufacturers produce goods: domestic mainly Yuci hydraulic Group Co., Ltd., Beijing, China and Germany Hydraulic Group Co., Ltd., Shanghai Lixin Hydraulic Component Factory and so on. Outside the United States Vickers, Rexroth, Germany and other manufacturers.

     Unloading relief valve Germany choice: unloading relief valve used in hydraulic circuit with accumulator Germany, when the accumulator valve fluid-filled pressure of Germany set the pressure so that hydraulic pump unloading automatically. Valves have built-in check valve to prevent a pressure accumulator in the oil back. At this point from the accumulator and the pump to maintain oil unloading system to receive energy-saving effect. When the accumulator in the oil pressure dropped to the valve set pressure to about 85% when the valve is once set, hydraulic pump to restore the accumulator fluid-filled.

     This valve can also be used to double-pump high-low voltage circuits. When two low-pressure oil pump to the system at the same time, high pressure pump when the valve so that the major unloading and separating it with the high-pressure section.

     For the accumulator to the accumulator between the valve and shall not exceed the set pressure to drop to 10%. Leakage-type valve to vent the oil port back-pressure shall not exceed the set pressure to 2%. ball valve Trunnion Mounted Ball Valve Floating Ball Valve Top Entry Ball Valve ball valve
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