Help, bubbling out not poping up and spraying

Discussion in 'Irrigation' started by EvandSeby, Nov 18, 2006.

  1. EvandSeby

    EvandSeby LawnSite Member
    Messages: 151

    Reisdential system, 1" Hunter SRV valve and 9 six inch ajustable spray heads. The water just boils out of the heads and the popups don't come all the way up. I have changed the diaphram, problem still exists. There are no visable leaks that I can see that would cause a loss of pressure. This is on a weekly mowing customer and the landscape contractor who installed the system won't even take a look for another few weeks. I just overseeded with perennial rye grass, and it needs water soon. I only do minor sprinkler repair work but this has me stumped. Any help would be greatly appreciated, and thank you in advance.
  2. mojob

    mojob LawnSite Senior Member
    Messages: 515

    If there are any other valves in the same box,you could try swapping the wires, solenoids, or guts of the valves. I'd do the easiest thing first which would be the wire swap. Do the other zones work properly? Has anyone done any digging or moving the soil anywhere in the yard? The line could have been kinked. If the all the swapping doesn't do the trick, you might have to open the line on the downstream side to see if you have pressure there. If this valve is off by itself, have you checked to see if it has pressure up to the valve?
  3. londonrain

    londonrain LawnSite Silver Member
    Messages: 2,129

    Hunter had a problem with the solenoids a few years back. If you have an old style solenoid with Hunter in Silver letters with gray or black wires more than likely that could be the problem. The inners of the solenoid would separate from the housing. When this happens the valve would not open completely. Check the solenoid. The new style solenoids have red wires.
    I have also had a SRV not open all the way after replace the diaphragm and solenoid. I replaced the top with the Hunter 1" PGV top and it worked just fine.
  4. EvandSeby

    EvandSeby LawnSite Member
    Messages: 151

    Thanks for the replies. PVC in the ground so no kinks. The reason I didn't think it was the solenoid, is the problem still exists when using the manual switch at the box and also on the bleeder at the valve (turning solenoid slightly) Its new construction with the red wires. I will try the new PGV top unit, is that the one with the flow control knob? Thanks again
  5. Wet_Boots

    Wet_Boots LawnSite Fanatic
    Messages: 50,749

    One reason for a valve failing to open completely, is an obstruction in the solenoid flow pathway, part of which is in the valve body. Probing with a marker-flag wire might be productive. Sometimes, glue can partially block the flow.
  6. londonrain

    londonrain LawnSite Silver Member
    Messages: 2,129

    Since it is a newer install, I would say check what Wet_Boots said. The PGV valve comes in flow and no flow.
  7. Mjtrole

    Mjtrole LawnSite Member
    Messages: 226

    I'd screw down all the nozzles to off and see if that doesn't speed up the process of finding a leak.
  8. Az Gardener

    Az Gardener LawnSite Gold Member
    Messages: 3,899

    Excuse me if I ask a stupid question but I have seen all kinds of stupid stuff. Did they pull the water supply from a Hose bib or 3/4' main line? If so may be just not enough pressure. Check the heads the little plastic screens may be full of PVC burrs not allowing enough pressure, but thinking and typing aloud the heads would still pop up just not throw much. If the valve has a flow control I would check that, close then open again. I don't know why that works but sometimes it does. Flushing heads is old school I know but it really does get you off to a good start.
  9. Dirty Water

    Dirty Water LawnSite Fanatic
    Messages: 6,794

    If the filters were clogged, the head would still pop.

    I'm going off the assumption that this zone at one time ran well?
  10. bicmudpuppy

    bicmudpuppy LawnSite Silver Member
    Messages: 2,781

    Turn on the zone in question and time the meter to see how much flow.............Are you flowing more than enough for those six heads? or are you not moving enough water? When you know that answer, then you have some idea of what you are trying to fix. Is the problem supply to the zone or is the problem in the zone. Good luck

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