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;
带有信号输出端口：由电子控制主板里的常开、常闭、公共三个端口引线可外接电磁阀或增压泵。
S with signal output port: by electronic control in the mainboard to often open and closed, public three port fuses can external electromagnetic valve or booster pump.
2位2通常闭电磁阀，拥有流量调节功能，适用于液体介质。
2位2通常闭电磁阀，拥有流量调节功能，适用于液体介质。
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