I have a very slowly weeping head on the middle zone(#3) in a 6 zone system. All 6 valves are located above ground in the same location.
1) I initially replaced the diaphram on the zone #3 : Still wept.
2) replaced the solenoid on #3 valve : Still wept
3) Replaced the entire valve and solenoid assy. with a new one : Still wept.
4) Removed brand new diaphram, inspected and lubricated : Still wept.
5) Cut the 3/4" pvc pipe exit from zone#3 just downstream of valve #3. Exercise valve on/off several times. When in off postion : no weaping.
6) Connected valve assy removed previously on house bib and it did not weep when off.
7) Installed a pressure gauge to confirm upstream pressure is 60 -70 lbs on manifold.
Exercised all zones one at a time while watching head in zone #3 that had wept previously : Initially saw a little weeping when zone 2 was turned off.
Was later unable to duplicate this.
After several days now with the zone #3 piping left open at valve outlet, no weeping. Other zones have been running every day.
I am now ready to reconnect the zone #3 valve outlet once again. Why do I expect it to weep once again ????
At wits end. What am I missing? I was thinking that somehow the zones were unintentionally partially connected together downstream of the valves. Testing does not support this. Any other tests recommended before I reconnect and hope for the best?