Backflow prevention

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phantomvs
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Joined: Thu Oct 22, 2015 6:27 am

Backflow prevention

Post by phantomvs » Fri Mar 08, 2019 3:28 pm

So I am wondering which one do we normally install in Canada in residential applications.

I had a plumber come over and he says to install a normally closed backflow valve.
He says it's always stays closed and only opens when sewer waste needs to exit house.

I see online they recommend normally open.
It only closes when sewer backs up.

I am guessing pros and cons to using each type.
But what is normally installed in new construction ?

Any thoughts guys ?
Anyone have one installed ?
Thanks again !

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Shannon
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Re: Backflow prevention

Post by Shannon » Fri Mar 08, 2019 3:50 pm

Ya know I’m not sure I thought they all where always closed?
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A. Spruce
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Re: Backflow prevention

Post by A. Spruce » Fri Mar 08, 2019 11:46 pm

Not something that I've run into, though I'm not under Canadian rule. 8-)
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christoff
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Re: Backflow prevention

Post by christoff » Sat Mar 09, 2019 5:50 am

I believe the flap is open and closes on back up of sewer.
https://www.cookwarecanada.ca/canplas-1 ... gLSCPD_BwE

phantomvs
Posts: 132
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Re: Backflow prevention

Post by phantomvs » Sat Mar 09, 2019 7:31 am

christoff wrote:
Sat Mar 09, 2019 5:50 am
I believe the flap is open and closes on back up of sewer.
https://www.cookwarecanada.ca/canplas-1 ... gLSCPD_BwE

Yes but you also have opposite type
According to the plumber I talked to normally closed is better.
As it prevents even rats or small backups from coming in as it's always closed.
Just opens when waste exits house.
But there are disadvantages as well. From what i understand it depends on where in the branch it is installed .

http://www.iapmonline.org/Documents/arc ... alves.aspx

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Shannon
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Re: Backflow prevention

Post by Shannon » Sat Mar 09, 2019 9:17 am

Well my 2cents is... any back check valve is better then no check valve. So check your local codes to see what they allow in your city for the position you want to install it. Your plumber will install whichever one you determine is the correct one for your code.
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