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

I received a service call, and the problem was that there was limited or no water comming out of the sprinkler system. I check the backflow and it was open, but I notice that 3 valves were burned so I replace them and the problem was still there, I open the pvc in front of the backflow to see the pressure and the pressure was very low, I opened the backflow to see the flow and it was still very low. and it was not working it was a 3/4" so I placed a 1" couble check valve, the pressure, and I still have the same problem. I already spend a lot of money on this repair and I cant find the problem. The water hose at the house has 80 psi and my system is divided on 7 stations with 8 pop ups per station. I need Help. This has never happen to me and I been installing since 2004.