I had one strange issue and hope some of you can help:

1) I got 3 sprinklers head on a single zone which is controller by a valve

2) if I open the valve enough so water can flow thru, then the sprinkler heads spray too much water , 50% farther than I expect (outside of my flower beds which is about 40 ft in circumference)

3) if I close the valve to reduce water flow (to reduce the watering area), then this only stays for about 15 seconds then the valve starts to close up and water just get sprayed about 1 or 2 feet from the heads.

What do I need to do to fix the problem.