Please help! Low pressure sprinkler zone. Valve is good

Discussion in 'Irrigation / Sprinkler Forum' started by Thomas Wright, Sep 26, 2019.

  1. Thomas Wright

    Thomas Wright New Member

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    Sep 26, 2019
    Location:
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    I have a sprinkler zone that has low pressure. I've bypassed the valve and observed the same problem, so it's probably not the valve.

    The weird thing is, if I manually pull the plunger fully up on the first sprinkler head in the line, this first head then regains the normal water spray pressure. Not only that, but then the rest of the sprinklers down the line all get improved spray pressure as well.

    But if I let go of this plunger, it falls down to about half height, and every sprinkler in the line all start to lose pressure again.

    I'm at a loss as what to do next. Is this a leak? a clog? I don't see a puddle anywhere, so to find a leak might mean digging up the entire line.


    Thanks in advance!
     
  2. HudsonDIY

    HudsonDIY Member

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    Jun 19, 2019
    Location:
    Hudson, Florida USA
    I think my first move would be to disassemble that head and see what manner of madness is going on inside.

    You say "plunger", is this a normal popup spray head?
     
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  4. Thomas Wright

    Thomas Wright New Member

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    Yeah the cylindrical thing that pops up with the nozzle mounted at the top.
     
  5. HudsonDIY

    HudsonDIY Member

    Joined:
    Jun 19, 2019
    Location:
    Hudson, Florida USA
    The top of the head screws off. You'll likely have to at least partially dig it up so you can hold on to the body while unscrewing the top.

    There's really nothing complicated about them. Pretty much just the popup shaft and a spring to retract the shaft when the water supply is turned off.

    Unscrew the top and check out what's going on in there. Once loose the top is going to spring up due to the spring tension.

    You can turn the zone on with the head apart to flush out any garbage in the line. Clean everything out and screw it back together.
     
  6. WorthFlorida

    WorthFlorida When the wife won't let you get a Harley!

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    Completely remove the pop up sprinkler down to the 1/2 nipple. Turn on the water to flush the pipe and replace the $3-$4 pop up. If you're getting water from a lake you be surprised what gets sucked up into the system. Under the nozzle there is a filter that sits on top of the riser.

    [​IMG] . popup.jpg
     
  7. Thomas Wright

    Thomas Wright New Member

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    Sep 26, 2019
    Location:
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    Thanks for the advice! I'll have a look at it tomorrow.
     
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