段落中"defeat"的理解? actuated isolation valves can be used in double block and bleed arrangements if means are provided to defeat automatic operation of the valves. 俺问点题外话,这个actuated isolation valves理解成esd阀吗?因为它与一般做切断阀的手阀不同,是自动操作的,在设备因检修隔离的时候是如何把自动功能去掉的呢?是在sis系统中去到掉的?查看更多