Quote:
Originally Posted by Dion
The sewer water came up through the toliet and the bath tub first before it came up in my floor drain. I was told if the water pressure is too high the valve won't work.
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The backflow preventer should be installed after the last tie in. So if it fails it should all fail.
I don't see how high water pressure should cause the valve to fail as the valve seat should be designed for the pressures it would face. And as soon as the differential pressure across the face of the valve is negative the valve should close. These are also fairly idiot proof devices so incorrect installation should not be an issue.
The only thing I can think of is sewage build up around the flapper or ball causes it to be stuck in the open position.