Watts Backflow 9D

Bob Gagnon plumbing and heating

Remove the 9D before turning the water on, and flush a whole bucket of water out to clean out the new piping. I used to have a lot of real slow leaks before I did this, no leaks after I started doing this. Thanks, Bob Gagnon

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Heatman_2

Watts Backflow 9D

I have a watts vavle 9D on a shop radiant system dripping out of the vent. I replaced it 2 months ago and it started dripping again, you guys have any ideas?

bob young

PUT A SWING CHECK BETWEEN BOILER INLET & 9D

Al Corelli_2

Also...

I've had luck with a check valve BEFORE the backflow device. We use a check before ANY backflow device, and have not had a leaker since.

This goes for the 9D, 909, etc.

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Derheatmeister

Just curious what kind of tubing is in the system?

[Deleted User]

is it a constant drip

or a once in a while spit?

ScottMP

What is the presure

feeding the system ?

Scott

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Home Depot Employee

Do you use a large draw on the water system in the shop for washing or turn off the water supply to shop at all?

Both of these would have an effect on the 9D seats.

bob young

check valve

n.y. state boiler code requires a swing check in addition to a backflow device & nyc boiler div. is enforcing this revision. after discussion with engineer i tend to agree it is a good thing. many backflows were failing due to temp. of boiler water. pres. red. valve apparently has integral check but .......