I just realized that 2 of my sprinklers are slowly leaking from the top, even when everything is off. I only have 2 zones, and there is 1 sprinkler leaking in each one. I assume they are the lowest ones.

I have Rainbird sprinklers, and Orbit 3/4" valves. My water pressure varies from 55psi to 35psi. When I shut the manual valve that feeds both Orbit valves, the dripping stops, and when I open them again it starts again, regardless of water pressure.

Is it normal for these valves to let some water through, and the 2 sprinklers are busted, or did something happen to my 2 valves?

Any ideas on what I need to do? I have thought on putting a pressure reducer to keep the pressure at 25psi, but I'm not sure if it would solve anything.

Thanks!