Plastic Water Solenoid Valve - 12V - 1/2 Nominal (ADA997)

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Control the flow of fluid using the flow of electrons! This liquid valve would make a great addition to your robotic gardening project. There are two 1/2" (Nominal … read more

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Hi, I’m replacing a 24v solenoid valve/power supply with one of these and a 12v PS I dug up from somewhere. The project is using a Crydom CN240A05, and my problem is it’s residual “off” voltage of .9 is not turning this solenoid off. I’ve tried two. I’m guessing I need to replace the Crydom, but I have no idea of what with! :slight_smile: Some help would be appreciated. Thanks, Glenn.

The CH240A is designed for AC, so try a DC version.

A brief explanation:
AC devices use an SCR or TRIAC which latches on until the voltage across them drops to Zero.
DC devices use a Power MOSFET which stops conducting when the control voltage is reduced/removed.