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原文
Overflow throttle works Overflow throttle is a pressure compensated flow control valve, which consists of 2 parallel relief valve 3 and the throttle valve is made. High-pressure oil inlet p1, part 2 go through the throttle actuator, the pressure reduced to p2, the other part of the overflow through relief valve to the tank 3. Relief valve on the bottom, respectively, before and after the pressure of the oil with the throttle p1 and p2 connected. When the outlet pressure p2 increases, the spool down, off the small overflow, overflow resistance increases, the inlet pressure p2 increases, and thus the pressure difference before and after the throttle valve (p1-p2) remained unchanged; and vice versa. The basic flow through the valve from the load effects. And the control valve is different from the overflow must be connected to the throttle actuator into the oil on the road. Then the pump outlet (ie, overflow throttle import) pressure p1 p2 with the load pressure and change, is a transformer system, a more reasonable use of its power, heat a small system.
原文来自：http://www.strainer.org.cn

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译文：
溢流节流阀也是一种压力补偿型节流阀，它由溢流阀3和节流阀2并联而成。进口处的高压油p1，一部分经节流阀2去执行机构，压力降为p2，另一部分经溢流阀3的溢流口去油箱。溢流阀上、下端分别与节流阀前后的压力油p1和p2相通。当出口压力p2增大时，阀芯下移，关小溢流口，溢流阻力增大，进口压力p2 随之增加，因而节流阀前后的压差（p1-p2）基本保持不变；反之亦然。即通过阀的流量基本不受负载的影响。与调速阀不同，溢流节流阀必须接在执行元件的进油路上。这时泵的出口（即溢流节流阀的进口）压力p1随负载压力p2的变化而变化，属变压系统，其功率利用比较合理，系统发热小.

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