Control Valves won't open.

Discussion in 'Irrigation / Sprinkler Forum' started by Super Dave, May 28, 2019.

  1. Super Dave

    Super Dave New Member

    Joined:
    May 27, 2019
    Location:
    Tallahassee, FL.
    Hello, I need help... We bought a house where the irrigation system had been not used/ likely broken down for many years. This was obvious by the turf overgrown over pop-up sprinklers in several areas. I have 6 zones, and 4 of them do not open/work. I am an electrician... the Toro GreenKeeper control sends power to the valve solenoids when I run the system... The solenoids retract when they receive voltage, but valves don't open... No water to sprinklers. After watching many videos and reading online, I have dismantled, cleaned, inspected diaphragms and inside of valves. Even took a piece of wire and cleared the bypass holes near the solenoid while I had the bonnet/cover off. Even when I attempt to manually start a zone by unscrewing the solenoid, no water to the zone (Yes the water is on. The shut off is right there in the box). The only way I can convince the valves to open is... while the solenoid is activated I have to turn the flow rate screw (which pushes on the middle of the diaphragm) all the way in, and then back it out a few turns... Then and only then the zone will come on. HELP
     

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  2. WorthFlorida

    WorthFlorida Broad-Wing Hawk

    Joined:
    Oct 28, 2009
    Occupation:
    Retired
    Location:
    Orlando, Florida
    The diaphragms are probably too stiff to flex. Once you get the water to flow with the flow rate screws turned and backed off, does the water shut off when the solenoids are deactivated (no power)? If they do not the diaphragms need to be replaced. I prefer valves with a bleed screw that these do not have.

     
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  4. Super Dave

    Super Dave New Member

    Joined:
    May 27, 2019
    Location:
    Tallahassee, FL.
    The diaphragms are probably too stiff to flex. Once you get the water to flow with the flow rate screws turned and backed off, does the water shut off when the solenoids are deactivated (no power)? If they do not the diaphragms need to be replaced. I prefer valves with a bleed screw that these do not have.
    Yes, the water does shut off when I deactivate the solenoids, but I think you have a good theory about the diaphragms being old and too stiff to flex easily. I am wondering if I should replace a diaphragm or two to see what happens. ???
     
  5. GenesisMan

    GenesisMan New Member

    Joined:
    May 3, 2016
    Occupation:
    IT
    Location:
    Topeka, Kansas
    I have the same problem. I have Toro adjustable flow with long bleeding needle in the middle. All valves working except this one need little help when turn on, I hear the water flow thru the valve but no sprinkler pop up. After I take the bleed needle off the water spray out of the needle hole and the sprinklers start to pop up and working. I have replace the whole new Toro valve and still the same problem. What is the issue, I am puzzle??
     
  6. WorthFlorida

    WorthFlorida Broad-Wing Hawk

    Joined:
    Oct 28, 2009
    Occupation:
    Retired
    Location:
    Orlando, Florida
    Not sure myself. Do you hear water noise when the solenoid is activated? Are sure you have the valve in the correct direction? There is an arrow pointing to the flow direction.

    By turning the solenoid counter clockwise about a 1/2 to 3/4 turn should cause the water to flow. If not, with the water off, back out the solenoid completely and run the water a few seconds to flush the valve. Thread the solenoid on but do not make it tight, no more than finger tight and try it again.
     
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