backflow preventer leaks when filling radiators

travlintom

Hello,



I drained my hot water system and had my radiators sandblasted and painted. I replaced them and tried refilling the system, but the backflow preventer leaks like crazy. Any ideas?



Thanks for your help!

Tom

Jamie Hall

You mean ideas

beside replacing it?  If a backflow preventer is leaking -- usually through the atmospheric vent -- it isn't likely to be worth taking apart and fixing, unless it is a very big one (say 3 inch and up).



I'd just replace it...

nicholas bonham-carter

Leaking back flow

What make is it? Our Watts back flows can apparently be repaired if needed, but when checked every year, they have no problem. --NBC

travlintom

backflow

Thanks for the replies. It's a Hersey and it'Is not big, but is on a 1/2" pipe.



And is it necessary, because I've noticed that there is a shutoff valve between it and the boiler, and if I close the valve the backflow stops leaking.



Thanks,

Tom