Quote:
Originally Posted by Reef Pilot
With my set up, both the solenoid (in the open position) and the float valve would have to fail before I could have an overflow. While theoretically possible, the mathematical probability of that is very, very minuscule. Especially, since the solenoid is spring loaded to close, and needs power to open. The much more likely failure is for the solenoid failing to open, which of course can't produce a flood.
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And if you wanted to get really silly anal, you could have a double solenoid system, so if one does stay open the other one would still close the line. But then you would double the chance of a closed failure (much more probable).
These are not airliner systems where life (human that is) is at risk, so we have to be reasonable/practical with the cost of our risk mitigation.