This is my second attempt to get this right. I have a 13 zone sprinkler system. In several of the zones the water coming out of the rotor head has very little pressure although the pressure going to the control valve is 55 PSI. I can turn the water off and on several times and the water coming out of the head increases like it should, but in a few minutes it may go back down, or it may work just fine, it just depends upon which zone. My valves are 1 inch Irritrol 2400S. The system is over 12 yea...
