Quote:
Originally Posted by ken0042
As you can see the waste water going out keeps the valve open, and then if you try to reverse the flow the flap gets pushed back and closes the system. At that point all I could see increased pressure doing is pushing hard to keep it shut.
Is it possible your neighbours had overland flooding? That was the one thing I was thinking of when we were talking about these vavles before; if you have one installed and you flood; does that not prove to your insurance company that it was not sewer backup? Meaning you'd be out of luck on a claim?
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Yes, very possible he had overland, although he says otherwise. Can't be sure, but I thought the same thing that physically the backflow should work. However, as the provincal adjuster and a few others have noted is that they can fail under major pressure such as a flood. I think I can find an article that backs that up.
I think my next step is to contact a plumber who specializes in this. Maybe it is a maintenance issue where I need to clean it every year.