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.
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.
原理:常闭型直动式电磁阀通电时,电磁线圈产生电磁吸力把阀芯提起,使关闭件离远开阀座密封副打开;
Principle: when the power is on, the electromagnetic force of the electromagnetic force to shut off the valve seat, the valve open;
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