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电液伺服阀是电液伺服系统中的关键性元件。本文讨论了电液伺服加载系统中常用的三类伺服阀的特点，分析了它们对加载系统性能的影响，并介绍了加载系统中的选用伺服阀应注意的问题。
Electrohydraulic servo valve is a key component in the electro-hydraulic servo system. This paper discusses the characteristics of the three types of servo valves commonly used in the electro-hydraulic servo loading system, analyzes their impact on the loading system performance, and introduces the attention should be paid attention to the selection of the servo valve in the loading system.