主管线 meaning in Chinese
trunk line
Examples
- Cold - water meters - propeller type for main line applications
主管线用旋桨式冷水表 - Pig inlet & outlet and oil ( air or water ) inlet shall be connected respectively to the main pipe by valves
收发球口和进油（气、水）口分别通过阀门与主管线连接。 - Controlled closing of the valve , opens the mainline check valve , gradually increasing line pressure
阀门受到控制的关闭操作，开启主管线止回阀，逐渐增加管线压力。 - The national fire protection agency ( nfpa ) guidelines require a confirming flow test to be conducted whenever a " main line " valve such as the shutoff valves or a backflow assembly have been operated
美国国家防火协会（ nfpa ）指导原则要求对于主管线上运行的阀门，如关闭阀或防回流阀总成，必须进行流量测试。 - Fire protection system installations : the national fire protection agency ( nfpa ) guidelines require a confirming flow test be conducted whenever a " main line " valve such as the shutoff valves or a backflow assembly have been operated
消防系统安装：美国国家消防局（ nfpa ）指导原则要求只要是“主管线”上已经运行的阀门，如关闭阀或防回流阀总成，都需要进行流量确认检测。