本标准规定了NPS 4及以下尺寸的手动或自动阀门的要求。本标准所涵盖的阀门旨在安装在水表和供水截止阀之间。

This Standard specifies requirements for manually or automatically operated valves, in sizes NPS 4 and smaller. Valves covered by this Standard are intended for installation as water shutoff valves between the meter and the supply stop.