Any combination of normally closed, normally open or universal valves may be grouped together. 任何组合的常闭,常开(NO)或通用阀门可组合在一起。
Normally Open(NO) A contact pair that is open when the relay is not energized. 在继电器未受激励时保持闭合的触点对。
Safety contacts must be of normally open design only. 安全触点只能是正常的开放式设计。
The second method uses a small permanent magnet to hold normally open contacts together. 第二种方法是采用小的永久磁铁使常开(NO)触点闭合在一起。
Normally Open(NO) pilot assisted valves operate on a similar principle but with opposite effects from the pressure variations. 常开(NO)阀运行试验的协助一项类似的原则,但与来自压力变化相反的效果。