正常关闭 shutdown normal ; Normally Close ; shutdown immediate
通常关闭 normally closed
正常关闭位 normally closed
异常关闭 dirty shutdown
正常关闭时间 [计] normal closing hours
正常关闭连接 connection close gracefully
正常关闭的线路 track normally closed
正常时关闭 normally close
常闭开关 normally-closed switch
允许关闭异常程序 enable close exception
产品内置工作状态控制开关，具有关闭、 常亮、自动感应三种状态。
Three built in control switches of operating states: OFF, ON and AUTO.
在爱尔兰，弥漫的大雪导致4万乘客滞留在都柏林机常同样的天气状况也导致德国杜塞尔多夫机场关闭。
Blinding snow in Ireland stranded some 40,000 travelers at the main Dublin airport, and similar conditions in Germany shut down its Dusseldorf airport.
原理：常闭型直动式电磁阀通电时，电磁线圈产生电磁吸力把阀芯提起，使关闭件离远开阀座密封副打开；
Principle: when the power is on, the electromagnetic force of the electromagnetic force to shut off the valve seat, the valve open;
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