本SAE航空航天推荐规程（ARP）规定了机载应用中使用的四个液压开关阀的设计、制造和鉴定要求。两个为压力操作，类型为IA和IB，两个为电磁阀/先导操作，类型为IIA和IIB。它们适用于四种压力等级3000、4000、5000和8000 psi。设计的设备拟安装在根据AS5440军用应用或ARP4752和ARP4925设计的液压系统中，具体取决于商用飞机的类型。详细（采购）规范中应包含额外或细化的要求，这些要求应优先于本ARP或本ARP引用的文件中任何潜在冲突的要求。

This SAE Aerospace Recommended Practice (ARP) establishes the requirements for the design, manufacture, and qualification of four hydraulic switching valves used in airborne applications. Two are pressure operated, Type IA and IB and two are solenoid/pilot operated, Type IIA and IIB. They are applicable to four pressure classes 3000, 4000, 5000 and 8000 psi. The equipment as designed is intended to be installed in hydraulic systems designed to AS5440 for military applications or ARP4752 and ARP4925 depending on the type of aircraft for commercial applications. Additional or refined requirements shall be contained in the detail (procurement) specification and these shall take precedence over any potentially conflicting requirements of this ARP or documents referenced by this ARP.