Irrigation第 19 / 100 题
An irrigation solenoid valve is operated by what signal from the controller?
a.A low-voltage electrical signal, typically 24 volts AC
b.240 volts AC line power
c.A pneumatic air line
d.A mechanical pull cable
解析
Standard automatic irrigation valves use a 24-volt AC solenoid that the controller energizes to open the valve. When the controller sends the low-voltage signal, the solenoid lifts a plunger and hydraulic pressure opens the diaphragm. This low voltage is safer and easier to run underground than line voltage.
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