Watts backflow preventer

Old 05-12-10, 06:26 PM
Thread Starter
Join Date: Mar 2005
Location: Minnesota
Posts: 252
Likes: 0
Received 0 Likes on 0 Posts
Watts backflow preventer

I have a watts backflow preventer that is about 20 years old, (no. 9D) serial no. 8646c. I had heard somewhere that there was a recall on these things. Is that so or was I dreaming. Thanks for any help or suggestions. All of a sudden last night water started comming out of the vent pipe, no loss of pressure or anything. Looks like a very poor design but I am not an engineer. A check valve like on a summersible pump would work better than this thing.
Old 05-12-10, 08:47 PM
Join Date: Jul 2009
Location: Toronto
Posts: 1,174
Likes: 0
Received 0 Likes on 0 Posts
That is the design of them.
During a backflow condition the back flowing water will force a piston to close the incoming water and allow the back flowing water to vent out to atmosphere.

A much better scenario than have boiler water feed back into your potable supply, yes ?

They are no expensive and simple to change.

Thread Tools
Search this Thread
Ask a Question
Question Title:
Your question will be posted in: