Went on a service call today, head leaking all the time. I figure it is a bad valve. Located valves, cutoff and backflow. No pressure regulator, and backflow is not to code. When I found the cut off is was only half way on. The valves are rb100dvf's, I put in a new diaphragm and cut the water back on this time all the way. I manually opened the repaired valve everything looked good till I shut it off. Every time I cut it off water would spray out of the body where it goes together. The water hammer was terrible (maybe why the cut off was only half way on), I tightend the screws on the repaired valve and that fixed that, only now the same thing is happening to the valve next to it. Going back tomorrow to see if the head is still leaking (couldn't't wait today for the lateral to drain) and taking another diaphragm for the other valve. Anybody had this problem before? I know I need to bring it up to code and the entire system needs an over haul, problem is we are in a drought and she wants to wait, just wants the leak stopped for now.