Choose based on the duration of continuous work: normally cl

1) When the solenoid valve needs to be opened for a long time and lasts longer than it is closed, the normally open type should be selected;

2) If the opening time is short or the opening and closing time is not long, select the normally closed type;

3) However, some working conditions for safety protection, such as furnace and kiln flame monitoring, cannot be selected as normally open, and should be selected for long-term power supply.