They work on the principle that moving water will not freeze. So look at the valve in the picture. The holes you see around the top will have water run out of them when it gets to freezing. I don't mean just drip out either. It will run a small stream. So if this is inside then it will need a drain to get away. They work on the brass parts contracting when they get cold and opening a valve. THEY DO NOT work on the water pressure opening them. The adjustment is to set them to the temperature you want them to open. Once they open they will stay open until the fitting warms up enough to shut off. The water flowing will usually make them do this. They usually run a minute or two then shut off for 5-10 minute and open again. They just keep cycling that way. I had them on water cups in the old tie stall milking barn. When the cows would go out to eat the barn would get cold enough they would open. Then when the cows where back inside their body heat would keep it warm enough that nothing would freeze then.
I also used a similar type of deal on an out side waterer. It had small nozzles that would swirl the water in the water bowl. It also had a stand pipe drain that you ran down into a gravel sump for the water to leach away.
This will not stop your line from freezing because it is not freezing where you would have the valve. Your line is freezing outside under the drive/ground. Can you just leave a facet on with just a little drip when it is real cold??? I had a bathroom sink that would freeze when below zero and high winds. We always just opened the facet just a little to keep it from freezing.
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Today's Featured Article - Hydraulics - Cylinder Anatomy - by Curtis von Fange. Let’s make one more addition to our series on hydraulics. I’ve noticed a few questions in the comment section that could pertain to hydraulic cylinders so I thought we could take a short look at this real workhorse of the circuit. Cylinders are the reason for the hydraulic circuit. They take the fluid power delivered from the pump and magically change it into mechanical power. There are many types of cylinders that one might run across on a farm scenario. Each one could take a chapter in
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