本标准规定了水流检测器止回阀的FM认证标准。水务部门要求这些设备监督私人消防管线，以检测泄漏或误用造成的水损失

This standard states FM Approvals criteria for waterflow detector check valves. These devices are required by waterworks authorities to supervise private fire service lines in order to detect loss of water through leakage or misuse