Built in back flow preventer

[Starcraft27]

Hi, I just installed a sprinkler system in the garden with a standard selenoid antisiphon Irrigation valve. When the system is running for more than 5 minutes an annoying drip leak comes from the back flow preventer part of the valve. Is there anything I can do about this?

 

[CornerWrench]

What brand? It shouldn't be doing that. I would screw the cap off and take a look at the back flow diaphragm just to be sure it doesn't have a slight imperfection. If its coming out of the threads then maybe a little Teflon tape would help. But if that's a new anti siphon valve it should be water tight. My personal favorite for anti siphon electric valves is the Irritrol version.
http://www.irritrol.com/valves/valves_2700s.html

 

[johnjh2o]

What brand? It shouldn't be doing that. I would screw the cap off and take a look at the back flow diaphragm just to be sure it doesn't have a slight imperfection. If its coming out of the threads then maybe a little Teflon tape would help. But if that's a new anti siphon valve it should be water tight. My personal favorite for anti siphon electric valves is the Irritrol version.
http://www.irritrol.com/valves/valves_2700s.html

In many areas that device isn't allowed. It has to be a testable device.

http://www.sprinklerwarehouse.com/F...U765-100.htm?gclid=COq-hqCMxLACFYqb7QodsEdvXA

John

 

[CornerWrench]

Very true. Hopefully the op checked with his building codes and met requirements.