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Try using the flow controller on the valve to reduce the flow and see if that works. Also could be the plunger in the solenoid sticking. You can unscrew the solenoid but be careful that the plunger doesn't pop out as they are spring loaded. Make sure it move freely. If it doesn't get a new solenoid.
This seems to be a common phenomenon. I live in So. Cal. so I don't know much about freezing temperatures and it's effect on valves. My guess would be the diaphragm. Hopefully someone who sees this every spring will chime in.
sprinklers won't shut off.
I had my sprinkler system blowing out last fall then this spring when I turned on the water at the manifold the sprinklers came on and now I can't shut them off. What do I do?