SPRINKLER TALK FORUM - You Got Questions, We've Got Answers

I had a similar problem in one zone using Rainbird rotors heads. The flow rate is marginal and all of the water spilling out around the stem does not allow sufficient pressure to build to cause the heads to pop-up and seal. My problem was fixed by putting a check valve under one of the heads. This causes the pressure to build up a little more at that head before the flow begins. This allowed enough pressure / flow to reach the other heads and cause them to pop-up and seal before the head with the check valve begins to flow. Probably not how you would design it - but cheaper than re-zoning or adding a booster pump...

Rainbird Tbird Heads cause the same problem. If they worked last year, before you winterized, then i would check the wiper seal on the sprinkler head, to make sure there is no grit in it, and if so clean it out, the dirt will prevent the head from sealing



Thanks
Ray
Rays Above and Beyond Automatic Lawn Sprinklers

You might have a Break in your lines .Start capping off your heads and look for bubbling up in the yard.

Nestor's Sprinklers & Lighting , Alpharetta,Ga.30022

vincent nestor