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old farts plz help.

Discussion in 'Irrigation' started by RhettMan, Apr 30, 2014.

  1. RhettMan

    RhettMan LawnSite Silver Member
    from Texas
    Posts: 2,032

    new dv100 valve installed for zone A
    made sure installed in correct direction of course
    checked system, everything looked good, zone has good pressure and I am feeling confidident and excited to show the customer, and then left the repair job, planning to return in the after noon.

    returned in afternoon to get payment/and do customer walk-through and

    what do you know...Zone A: when manually operated - sputters nice pressure for a second or two, and then peters out to a "low pressure dribble"

    so i checked......
    resistance at clock - good
    resistance at soleniod- good
    voltage good - good

    swapped the entire bonnet, diaphfram, and soleniod and cleaned up the cable ends and made what i hoped to be nice, good wire connections.

    still : Zone A: when manually operated - sputters nice pressure for a second or two, and then peters out to a "no pressure dribble"


    *trucewhiteflag*
     
    Last edited: Apr 30, 2014
  2. 1idejim

    1idejim LawnSite Fanatic
    Posts: 8,810

    Did you flush the valve when you had it opened?
    Posted via Mobile Device
     
  3. Without A Drought

    Without A Drought LawnSite Senior Member
    Posts: 984

    you have a restriction somewhere upstream. your static pressure is good upon opening, but the flow restriction keeps the volume below what is needed to maintain operating pressure.
    check for a partially closed valve upstream or debris in the like where you added the valve.
     
  4. larryinalabama

    larryinalabama LawnSite Fanatic
    Posts: 16,235

    You got a broke sprinkler and or riser. Leave it on and find the wet spot.

    From an old fart....
     
  5. RhettMan

    RhettMan LawnSite Silver Member
    from Texas
    Posts: 2,032

    hmm, this COULD be, but....

    why then was the pressure good during the AM check?
    and also very good for a few seconds upon each powering on?

    It is possible that SO MUCH flushing is occuring upon rotor-stem-lifting that the heads are not able to seal? and are thus continuing to flush high voume from the body/stem sealing area?

    I see this alot with those gray rotors that are multi-holed for "the stream discharge port", for lack of a more proper description in that particular head type's case.
     
    Last edited: Apr 30, 2014
  6. RhettMan

    RhettMan LawnSite Silver Member
    from Texas
    Posts: 2,032

    Mr. Jim, what do u mean? isnt the valve flushed every time it is opened? :)
     
    Last edited: Apr 30, 2014
  7. txirrigation

    txirrigation LawnSite Senior Member
    from Texas
    Posts: 977

    Pull off the solenoid, clean the small hole from the valve. You should be good to go.
    Posted via Mobile Device
     
  8. Mikegyver

    Mikegyver LawnSite Bronze Member
    Posts: 1,810

    Like he said, stick a flag or pipe cleaner in there and you should be fine.
    Mike
     
  9. 1idejim

    1idejim LawnSite Fanatic
    Posts: 8,810

    If there is an obstruction upstream of the valve it should clear itself when you flush the valve body. You could just have something floating around in the pipe.
    Posted via Mobile Device
     
  10. 1idejim

    1idejim LawnSite Fanatic
    Posts: 8,810

    You've asked me many questions before Rhett, both electrical and hydraulic. This sounds as if it's a hydraulic problem. Clean the port as tx and mike suggested. Then if it still spits and sputters shut it down and flush the mainline through the valve with the bonnet off. If it's a restriction due to debris it may purge itself. Eliminate one thing at a time.
    Posted via Mobile Device
     

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