本文件定义了其他国际标准中定义的液压阀安装面和液压插装阀腔的识别码（见参考文献）。 本文件不适用于不符合这些国际标准的安装面和插装阀腔。 本文件不要求在硬件上标记识别码。

This document defines an identification code for hydraulic valve mounting surfaces and for hydraulic cartridge valve cavities that are defined in other International Standards (see Bibliography). This document is not applicable to mounting surfaces and cartridge valve cavities that do not conform to these International Standards. This document does not require that the hardware be marked with the identification code.