指定标识的规则。尤其适用于未来将开发的具有两个和三个端口的阀门，而今天的阀门端口标记实践有所不同。识别规则适用于提供两个阀门之间或阀门与管道之间连接的端口。

Specifies rules for the identification. Applies in particular to valves which will be developed in future with two and three ports, where today's practice of marking valve ports is different. The identification rules apply to those ports which provide the connection between two valves or between a valve and a pipe.