Any combination of normally closed, normally open or universal valves may be grouped together. 任何组合的常闭(NC),常开或通用阀门可组合在一起。
Break contact ( normally closed ) with time delay. 具有时延作用的断开(正常情况下为闭合)触点。
This approach can work because in some systems " 0 " is invalid ports, When you attempt to use a normally closed the port connecting to it will produce different results. 这一方法能够工作是因为在一些系统中“0”是无效端口,当你试图使用一种通常的闭合端口连接它时将产生不同的结果。
Control type : Normally closed, normally open, double acting. 控制形式:标准常闭(NC)、常开、双作用。
Normally closed switches, less common than normally open, are made in one of two ways. 常闭(NC)开关没有常开开关那么常见,它是采用两种方式之一制成的。