Question
Mr. Grote,

One of my zones has no pressure.  It appears it is coming from the valve.  I capped all the heads on that zone leaving two open.  I took a water hose turned it on and placed it at one of the sprinkler connectors.  I continued to do this as my second test to see if there was a leak in the pipes in between heads.  It appears I do not have a leak problem.  

I came across this site and saw you answer one person's similiar problem: "If you flushed the lines and got a lot of rock you may have rocks and debri at the connection going to the heads. It reduces down at the head to either 1/2" OR 3/4" and there would be the next place to look. also check and make sure the water is on all the way and that the valve that turns the system on and off is opening fully. With the heads running listen and see if you hear a hissing noise at the valve. I am asuming the on/off valve is not 3 feet in the ground."

Are you saying if I hear a hissing noise the valve is no open fully?  If so, what do I need to do?

Thank you


Answer
Jay, Yes if you here a hissing noise that sounds like a restriction when the valve is on electrically. you could try to look for a thumbscrew, which would be a manual bleed and turn it on like that. Warning if it is an old valve and you turn it on manually it could get stuck on! If the heads look like they are working better then rebuild the valve if you can get the same valve. If it is a valve that is no longer made, then you have to dig it up and replace it with new. Jim