Low pressure on one zone

Discussion in 'Irrigation' started by Dennistnt, Jul 18, 2013.

  1. Dennistnt

    Dennistnt LawnSite Member
    Posts: 35

    I have one zone where the 4" pop ups barely rise. All other zones work fine. I timed the water meter and the "bad" zone used 17gpm, but the heads in this zone only require 9-10 gpm. A few other zones showed 13gpm at the meter.

    The electrical tested fine. 24v at station in the timer and 43 ohms resistance at the clock and the solenoid. I switched out the entire top of the valve to rule out the diaphragm, but no improvement. I also checked the exhaust port below the solenoid and it wasn't blocked.

    A few of the wiper seals were loose so I replaced these heads and still no pressure increase.

    I also put a pressure gauge on the head closest to the zone valve and it only reads 20 psi. The yard doesn't have any dry/brown areas so it's difficult to tell if there's a leak in the zone piping.

    It seems like there's an obstruction in the zone piping, but maybe I'm missing something.??

    At advice/input much appreciated.
    Thanks
     
  2. Mike Leary

    Mike Leary LawnSite Fanatic
    Posts: 21,903

    You're not going to get much help on this forum. I'd suggest the H.O. forum; too many variables for us. I'd think, from the the hip, you're overzoned. :waving:
     
  3. Dennistnt

    Dennistnt LawnSite Member
    Posts: 35

    Thanks Mike. I'm new to this forum. What's the H.O. Forum?
     
  4. Mike Leary

    Mike Leary LawnSite Fanatic
    Posts: 21,903

    It's the "Home Owners" forum, and sometimes you guys can figure the problems out. Did the zone ever work?
     
  5. DanaMac

    DanaMac LawnSite Fanatic
    Posts: 13,156

    If the zone is putting out 17 gpm, but it's designed at 9-10 gpm, then you have a leak. Sometimes a leak is not immediately noticeable. Remove the heads, cap them off, then you'll find the water surfacing somewhere.
     
  6. 1idejim

    1idejim LawnSite Fanatic
    Posts: 9,313

    Totally agree with the newly wed, got a leak my friend.

    Capping the heads will help you narrow it down.

    Nice job with the information, prolly one of the better that i have read.
     
  7. jbell36

    jbell36 LawnSite Bronze Member
    from KANSAS
    Posts: 1,282

    are the head nozzles fixed or are they adjustable? you can always shut them down if they are adjustable, or replace the nozzles with adjustable (if applicable) and wait for a leak...i do agree, definitely a leak..
     
  8. DanaMac

    DanaMac LawnSite Fanatic
    Posts: 13,156

    Well, he could do that. But I prefer he do it the hard way :)
     
  9. 1idejim

    1idejim LawnSite Fanatic
    Posts: 9,313

    Standing up in a kayak?
     
  10. AI Inc

    AI Inc LawnSite Fanatic
    Posts: 25,300

    what he said. Take off your boots and take a walk.
     

Share This Page