Funny problem with one zone on sprinkler system

Well I turned the water back on for the main line of the sprinkler sytem last night after I had to turn it off the night before because I saw water trickling down the driveway. I went out to take a look at the valve that I thought was having problems and heard a noise coming from the valve. Water rushing. I knew this was not good. I opened up the valve cover and there was no water in the box. That was good news. So I opened the valve manually(just turned the valve lever). that let the water flow through it for a bit. I then closed it and no more noise. I check to make sure there was not a leak or trickling near the driveway. All looked good. So I turned that zone on through the timer/controller. It came on fine. So I turned it back off and checked the valve again and also check the sprinkler head that was trickling. Nothing. So problem seems to be fixed. That was much easier than I thought it was going to be.