Low water pressure on ONLY one zone

Discussion in 'Irrigation / Sprinkler Forum' started by Dave Park, Apr 18, 2020.

  1. Dave Park

    Dave Park New Member

    Joined:
    Apr 18, 2020
    Location:
    Iowa
    Hi,
    I am struggling to fix my sprinklers. I have 5 zones. 4 of them are working properly but the last one (zone 5) has a very low water pressure. I checked voltage and it was fine. I also replaced the solenoid and diaphragm of the valve. Nothing worked :(
    Any help?

    Thanks,
     
  2. Modifyit

    Modifyit New Member

    Joined:
    Sep 27, 2019
    Location:
    Virginia Beach, VA
    I'm no expert, but with 4 of 5 zones working properly, it would seem to be a restriction in the zone, or a ruptured pipe. Perhaps a restriction just ahead of the control valve or in the valve body.
     
  3. Sponsor

    Sponsor Paid Advertisement

     
  4. WorthFlorida

    WorthFlorida The wife is still training me.

    Joined:
    Oct 28, 2009
    Occupation:
    Retired
    Location:
    Orlando, Florida
    Yes, a stone can be lodged in at a 90* elbow or anywhere else, even before the valve. Did you notice in the old valve was it full of mold? Pop ups have a filter screen just under the spray head. They could be plugged up with mold or mud and dirt. Locate the first sprinkler head for that zone, remove it and turn on the water to give it a flush. Another way is remove the last sprinkler of the zone, with a garden hose try to back flush the pipes to the first sprinkler head location.

    It may be a pain to do now but just after the new valve, install a tee with a threaded middle joint and buy a threaded end cap. With the cap off turn on that zone and if the water comes out like a geyser, you know you are good to that point.
     
  5. supaugly

    supaugly New Member

    Joined:
    Jun 7, 2020
    Location:
    California
    Im having the same issue. I have 4 zones and 1 is low pressure. When I take the cap off and dry it out it stays dry. When I open the solenoid I can hear some water but barely a trickle is passing through the valve. I dont get it!
     
  6. WaltN

    WaltN New Member

    Joined:
    Jul 12, 2020
    Location:
    Denver
    I had the same problem and found the likely solution on this web site. There is a small port in the valve body that is controlled by the solenoid. If that port gets plugged, the end result is low water pressure at the sprinkler head. Get a 18 gauge piece of wire, or similar, remove the top of the valve and insert the wire into the small port beneath the solenoid to make sure the opening into the supply line or lower chamber of the valve is open. Hope this helps...
     
  7. Ralph Moss

    Ralph Moss New Member

    Joined:
    Jul 25, 2020
    Location:
    Texas
     
  8. Ralph Moss

    Ralph Moss New Member

    Joined:
    Jul 25, 2020
    Location:
    Texas
    I have about same problem when valve first opens good pressure then it drops way down and my pump pressure also drops sprinklers have very very low output is this caused by bad valve
     
  9. Reach4

    Reach4 Well-Known Member

    Joined:
    Sep 25, 2013
    Location:
    IL
    Could be a well short of water.
     
  10. Ralph Moss

    Ralph Moss New Member

    Joined:
    Jul 25, 2020
    Location:
    Texas
    My other stations work fine. Cannot figure out my problem unless a bad valve which I am having a hard time locating.
     
Similar Threads: water pressure
Forum Title Date
Irrigation / Sprinkler Forum No Water Pressure Apr 29, 2019
Irrigation / Sprinkler Forum How to calculate pressure to choose water pump Dec 26, 2016
Irrigation / Sprinkler Forum No water pressure to sprinkler heads Apr 1, 2010
Irrigation / Sprinkler Forum Loss of water pressure in 1 zone Feb 25, 2009
Irrigation / Sprinkler Forum Surging water/pressure in new well point Oct 22, 2008

Share This Page