本SAE航空航天推荐规程（ARP）提供了航空航天流体动力、驱动和控制系统中使用的技术术语和术语及其定义和缩写/首字母缩略词。注:ARP490和ARP4493是专门用于电液伺服阀的定义来源。

This SAE Aerospace Recommended Practice (ARP) provides the technical terms and nomenclature, together with their definitions and abbreviations/acronyms that are used in aerospace fluid power, actuation and control systems.NOTE: ARP490 and ARP4493 are sources for definitions specifically for electrohydraulic servovalves.