本文件规定: a） 应用领域；b） 软管接头防真空阀的要求；c） 公称尺寸DN 15至DN 25（含DN 15）的软管接头防真空阀的尺寸和理化性能，以及一般液压、机械和声学设计性能；d） 标记和技术产品信息。购买本文件时可获得的所有当前修订均包含在购买本文件中。

This document specifies: a) the field of application;b) the requirements of hose union anti vacuum valves;c) dimensional and physio-chemical properties, and properties of general hydraulic, mechanical and acoustic design of hose union anti-vacuum valves of nominal sizes DN 15 up to and including DN 25;d) marking and technical product information.All current amendments available at time of purchase are included with the purchase of this document.