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post #12 of (permalink) Old 03-03-2011, 01:27 PM
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Hi Jim,

There are a few ways to do it. Obviously redundant float valves are the one option, but this could be unsightly in a nice tank. I use these floats from It simply a relay that cuts off power to the water fill solenoid.

I also use a normally closed solenoid, meaning that it needs to be energized to open. Lost power, solenoid (valve) closes down.

In addition, I also put this entire thing on a timer and set the timer to just about the amount of time it take to fill. I had this down pretty tight. This way, if the float for some reason stuck (which it never has) the timer will cut the power to the solenoid.
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