If you are having issues with your irrigation valve, read this article to help troubleshoot.
Troubleshooting a leaking irrigation control valve
Controller and Valve Troubleshooting Guides - Agency
Valves - Valve Not Closing
Troubleshooting - Superior
Signature/Nelson 7901 Nelson Sprinkler Valve Repair Tips and P/N
Troubleshooting an Irrigation Valve That Won't Turn Off
Troubleshooting Archives - FIMCO Manufacturing Inc.
Troubleshooting Archives - FIMCO Manufacturing Inc.
Troubleshooting Valve Issues
How to Fix What Appears to be a Sprinkler Valve Problem