译文：
工作原理：卸荷溢流阀由溢流阀和单向阀组成。当系统压力达到溢流阀的开启压力时，溢流阀开启，泵卸荷；当系统压力降至溢流阀的关闭压力时，溢流阀关闭，泵向系统加载。使泵卸荷时的压力称为卸荷压力，使泵处于加载状态的压力称为加载压力。 功能及应用：卸荷溢流阀的主要功能是自动控制泵的卸荷或加载。鉴于卸荷溢流阀的功用，要求卸荷压力与加载压力之间存在一定差别。差值过小，则泵的卸荷与加载动作过于频繁；差值过大，则系统压力变化太大。 加载压力与卸荷压力的差值是卸荷溢流阀的重要性能指标，一般加载压力为卸荷压力的85%左右。其性能与溢流阀相同。 卸荷溢流阀的主要用途： a.蓄能器系统中泵的自动卸荷及加载； b.高低压泵组合中大流量低压泵的卸荷。 生产产品厂家：国内主要是榆次液压集团有限公司、北京华德液压集团有限公司、上海立新液压件厂等。国外有美国Vickers、德国力士乐等厂家。 卸荷溢流阀德选用：卸荷溢流阀主要用于装有蓄能器德液压回路中，当蓄能器充液压力达到阀德设定压力时自动地使液压泵卸荷。阀中有内装单向阀防止蓄能器中的有压油液倒流。此时由蓄能器维持对系统供油而泵卸荷从而收到节能效果。当蓄能器中油液压力降至到阀设定压力地85%左右时，阀又复载，液压泵恢复向蓄能器充液。 这种阀也可以用于双泵高低压回路。低压时两个泵同时向系统供油，高压时此阀使大泵卸荷并把它与高压部分隔开。 用于蓄能器地阀与蓄能器之间地压降不得超过设定压力地10%。外泄式阀泄油口背压不得超过设定压力地2%。

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原文：
How it works: 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%.