gopackgo
New Member
I have a Watts 919 backflow preventer on my irrigation system. It is leaking out the bottom through the relief valve. Most of the advice I have seen states that there is probably debris in either the 1st or 2nd check valve. I've taken both check valves apart - no debris and the rubber parts and seats are in very good condition. I also took apart the relief valve and again the rubber parts and seats look good, with the exception of the diaphragm. It is not cracked or broken but the material on one side (away from the valve seat) is "crumbling." Sorry, don't know how else to describe it and I am not familiar with how it should look. Could a bad diaphragm also cause the leaking? How about a weak spring in check valve #2? By design, check valve #1 has a much stronger spring than #2.