Low Pressure On 1 Sprinkler Head

Discussion in 'Irrigation / Sprinkler Forum' started by waders, Jun 3, 2009.

  1. waders

    waders New Member

    Messages:
    4
    I have a 10 zone sprinkler system with 4 heads per zone. It's worked great for years. This spring, one head on one zone would only spray water 3 ft (verses 20 ft). I replaced the head and and it would still only spray 3 ft. There were no leaks at any of the sprinkler head connections. I took off the head and there seems to be good water flow, but very low pressure. I don't understand how I can have low pressure on one head while the three other heads on the zone are working fine. Any ideas or suggestions?
  2. FloridaOrange

    FloridaOrange Plumbing Designer

    Messages:
    1,317
    Location:
    SW Florida
    Could have a kink in the line further up after the three heads that work fine. What's the material?
  3. waders

    waders New Member

    Messages:
    4
    The tubing is 3/4" poly from the valve with 1/2" poly tee'd off going to each head. The problem head is either the first or second heads Tee'd off of the 3/4" line.
  4. FloridaOrange

    FloridaOrange Plumbing Designer

    Messages:
    1,317
    Location:
    SW Florida
    Have you inspected the 3/4"x1/2" tee?
  5. waders

    waders New Member

    Messages:
    4
    Not yet...regretably it will take a lot of digging. Also, that Tee is close to where the utilities enter the house, so I'll have to get them marked prior to digging.
  6. Wet_Boots

    Wet_Boots Sprinkler Guy

    Messages:
    798
    Location:
    Metro NYC
    What about the possibility of tree roots choking off the supply?
  7. chris8796

    chris8796 New Member

    Messages:
    100
    Location:
    Illinois
    Have you checked the valve for problems? Some valves have built in filters, which can become clogged. Does the valve have flow control and is it opened up?
  8. waders

    waders New Member

    Messages:
    4
    Problem Fixed! FloridaOrange nailed it. The problem was at the Tee. The tubing (not the Tee) was cracked just after the Tee. I spliced in a new peice of tubing, put on the old head, and everything works great.

    It didn't take as much digging as expected. As I was trying different things, water began seeping up from the crack. Thanks for your help.
  9. FloridaOrange

    FloridaOrange Plumbing Designer

    Messages:
    1,317
    Location:
    SW Florida
    Gonna have to send my wife a link to this! :D

    Just kidding, glad to help where ever I can.:cool:
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