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I removed the solenoid. There was dirt in the chamber and the bottom end of the solenoid was dirty. I cleaned and reinstalled. Problem solved.

I have a five valve irrigation system. Four of the five work perfectly. One, when it "turns on" (in sequence, it is the third zone of the five) knocks/hammers unstoppingly until I shut off the zone. Since the system is at least 15 years old, I suspect that particular valve is the problem. I can...