这些阀门可以常闭，常开或普遍。
These valves can be normally closed, normally open or universal.
控制形式：标准常闭、常开、双作用。
Control type: normally closed, normally open, double acting.
通常分为常开型，常闭型和自保持式三种。
Usually divided into normally open, normally closed and self-holding three.
在该系统中，针形阀i常闭，针形阀常开。
In this system, I often close the needle valve, needle valve is always open.
机械压力开关，1个常闭点常开点，正表压。
Mechanical pressure switch, 1 nc, no, positive gauge pressure.
报警输出：常开常闭信号，控制排风扇，电磁阀信号。
Alarm output: frequent on or off signal, control exhaust fan, electrical magnetic valve signal.
报警输出：常开常闭信号，控制排风扇，电磁阀信号。
Alarm output: frequent on or off signal, control exhaust fan, electrical magnetic valve signal.
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