How can I turn off a liquid valve when a flame goes out? : <p>I'm trying to make my family's life easier and cheaper. I'm heating my barn with a waste oil drip heater. I want to be able to automatically turn off the oil feed valve in case the burner goes out which would cause the barn to fill up with oil and possibly cause a fire.The oil tank will be under about 10 pounds of pressure with a 60 of used oil. Normally it  would be attended, but just a few minute error can cause a disaster. I can imagine this could be started out with a hot water heater or dryer flame sensor. But, I don't know where to go from there.</p>
