main shut off valve 中文意思是什麼
main shut off valve
解釋
總關閉閥-
Fire protection system installations : the national fire protection agency ( nfpa ) guidelines require a confirming flow test be conducted by a certified tester whenever a " main line " valve is installed, such as a shut - off valve or a backflow preventer
消防系統安裝:美國全國消防局( nfpa )指導方針要求在安裝「主管道」閥門時要由有資格證書的檢驗員對關閉閥或防迴流閥進行流量檢測。
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