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Backflow preventer question
I'm helping a neighbor skim his steam boiler (very dirty) and I am running into an issue that has confused me a bit. The installer put a backflow preventer in between manual feed valve and boiler. The valve has a copper pipe that comes out the side (vent?) and down into a big 5 gallon bucket. Everytime homeowner fills boiler via valve, a ton of water shoots out backflow valve and some into the boiler. This makes doing a slow skim challenging. Having never worked with a BFP, I dont know what's normal, but this just doesn't appear correct.
Can they be installed "reversed" and cause this to happen? Could there be crud in the valve? I started to feed the water and covered the end of the copper "downpipe" with my thumb. When I removed it, the flow had minimized and we are now able to keep a flow going into the boiler to do the skim.
Thanks in advance,