Question
The Racecourse i do grounds work for has an eight station system utilizing the 3" century valves running them hydraulically and some stations or sprinklers off a station stay on all the time - any idea how to fix ?

Answer
Hey Daniel, yes you need to rebuild the valves by installing a new diaphragm and possibly a new solenoid. go to www.irrigationtutorials.com, and this website will give you some direction on how to re build these valves. Good luck and have a great day.