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Author:
jmorley (Non-US)
Hey there, I have a mystery problem and I'm looking for some wisdom to help me understand what's happening.
We have a house in central america which is on a hill. The water tower for the house is further up the hill, and also sitting on a concrete pedestal, making it about as high as the roof of the house. The municipal mains feed comes in to the property close to the tank, and to my knowledge, goes only to the tank feed, at the top of the tank. I can't confirm this as those lines are buried under a cement driveway. We only get municipal water every other day, for about 4 hours.
Here's what I don't understand. When both the input line and the output line valves are open, as the tank fills, backpressure from the house comes through the "out" and causes the tank to overflow. I'm sure it's backpressure, as if I turn of the valve going in to the tank, and even the main line valve, water continues to get pushed out the tank, until I turn off the out valve of the tank - then it stops.
I have no idea where this pressure is coming from or why this is happening. I've just purchased a check valve which I will install after the out valve of the tank, but I don't understand what is happening. If anyone has an idea I'd love to hear it. Thanks!
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Post Reply
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Author:
North Carolina Plumber (NC)
If I understand you correctly, the town pressure is greater than your tank pressure and it's back feeding from your house back up to the tank. A check valve in the pipe from the tank to your house should solve the issue.
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Author:
hj (AZ)
With those systems, if piped correctly, the city main FEEDS the tank with a float valve of some kind and then water flows into the house by gravity. If there is any "city pressure" into the house it is usually ONLY the kitchen cold water.
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