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A backwater valve is a backflow prevention device used to prevent outbound water through a dwelling's drain pipes from re-entering -- "back flowing"--into a home. The valve contains a flap that allows water to exit the home, but closes to prevent the back flow into the home.
Backwater valves commonly activate when a city's sewer lines are unable to handle a large amount of falling precipitation; this puts homes that are tied into the storm lines at risk of having water back flow into them.
There is a big difference between backwater valves and backflow preventers:
- A backwater valve prevents raw sewage from backing up into your home through your toilets, showers, etc.
- A backflow preventer deals with protecting your potable water source from being contaminated by a reverse flow of foul water (ex: isolating your toilet's flush cistern and water supply from the toilet bowl water itself).
Video Backwater valve
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Source of the article : Wikipedia
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