pressure regulator reducer failure

Discussion in 'Irrigation / Sprinkler Forum' started by raldem7, Apr 20, 2014.

  1. raldem7

    raldem7 New Member

    Messages:
    1
    Location:
    TN
    I am looking for a replacement pressure regulator for a drip system to maintain 20-28 psi (30psi max). I've read that PRVs do not necessarily fail to a limiting pressure. My system is limited by the goof plugs (rated at 30 psi max). Can anyone recommend a regulator that is unlikely to fail to a high pressure (>30 psi)? I am currently spending ~$8 per PRV and would spend considerable more for higher confidence. My supply pressure ranges from 40-70 psi. Thanks for any recommendations.

    Ralph
  2. DonL

    DonL Jack of all trades Master of one

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  3. valveman

    valveman Moderator Staff Member

    Messages:
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    Location:
    Lubbock, Texas
    Any pressure regulator will have “creep”. This means it will let the pressure “creep” through until the pressure on both sides equalizes. A small expansion tank on the discharge side of the PRV will make it take a long time to increase the pressure. Without an expansion tank the PRV only has to “creep” by a thimble full of water to overpressure the system. You could also use a pressure relief valve after the PRV, but I think the little tank is best.
  4. DonL

    DonL Jack of all trades Master of one

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    The regulator should not creep on a drip system because the output should always have some flow, because it is always open.

    If it can creep then the flow of the system needs some adjustment, or the control valves need to be relocated.


    Maybe I missed something.
  5. valveman

    valveman Moderator Staff Member

    Messages:
    4,522
    Location:
    Lubbock, Texas
    There should be an electric solenoid valve between the drip lines and the pressure regulator. The drip lines are not always open. When the electric valves are closed, the pressure will eventually equalize on both sides of the pressure reducer valve. That is unless the solenoid valves “creep” as much as the pressure reducing valve.
  6. DonL

    DonL Jack of all trades Master of one

    Messages:
    4,353
    Location:
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    Exactly.

    I guess I don't get the problem.


    Carry on.
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