I have one of those indexing valves for my sprinkler system as is common in Florida. The system is pump-fed. Recently, all the zones come on at the same time and as a result the pressure is greatly reduced.
I disassembled it and re-seated the cam and it worked for a bit.
According to the troubleshooting guide of my valve (https://www.krain.com/6000-series-indexing-valves) it could be that there are too many heads on a zone (we recently added some heads to a zone).
The manual says a solution is to:
N: Reduce the number of heads on the zone to obtain the proper sprinkler operating pressure.
How can one determine the proper number of heads for a given zone?