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介绍了一种适用于低压、小流量润滑系统的检测元件———流量继电器的原理和结构。并通过对流量继电器与压力继电器的应用比较，说明该元件可靠性高、检测精度高的特点，有着广阔的使用前景。
A principle and structure of a flowrate relay, which is suitable for the detection of low pressure and low flow lubrication system, is introduced. And through the comparison of the application of the flow relay and the pressure relay, it shows that the element has the characteristics of high reliability and high detection accuracy, and has a broad prospect of use.