They have to rest and cool down between uses or they will fry. Most solenoid valves are not for continuous use. When current is flowing in the magnet, it creates heat. If you power the magnet with the expected current / voltage, the valve will open and the water will flow.įor NO (Normally Open), it is exactly the contrary. If you put pressurized water in a NC (Normally Closed) solenoid valve, water will be blocked. Normally refers to when-there-is-no-current-in-the-solenoid. They usually come in two flavors : Normally Open or Normally Closed. It is, like relays and motors, an inductive load (aka an IC buster, go read on back EMF if it is not already done!). Solenoid valve : It is nothing more than a valve controlled by an electromagnet. I will not talk (again) in details of the back EMF, why it is nasty and why you need a flywheel diode, as I already discussed that in another instructable here.
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