Check valve on Backflow assembly

Discussion in 'Plumbing Forum, Professional & DIY Advice' started by Paulypfunk, Mar 2, 2021.

  1. Paulypfunk

    Paulypfunk In the Trades

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    Feb 26, 2010
    Location:
    Seattle
    I’m having a debate with some friends about the best place to put a check valve in conjunction with a RPBA. I always thought it best to put it downstream of the device to prevent nuisance discharge, a colleague said it’s better to put the check valve upstream to absorb any pressure fluctuations coming from the incoming water supply. What say you all?
     
  2. James Henry

    James Henry In the Trades

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    Jul 23, 2019
    Occupation:
    Plumber
    Location:
    Billings, Montana.
    Check valves are not installed near a RPBA, The RPBA is a form of check valve, you may already have a check valve at your meter. If your RPBA is constantly discharging or dripping then it needs maintenance.
     
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  4. Paulypfunk

    Paulypfunk In the Trades

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    I commonly see them installed next to an rpz as a secondary check.
     
  5. James Henry

    James Henry In the Trades

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    Jul 23, 2019
    Occupation:
    Plumber
    Location:
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    News to me. wasn't mentioned in backflow class.
     
  6. Terry

    Terry Administrator Staff Member

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    Bothell, Washington
    I have always assumed that the reduced pressure back flow was all you needed too.
     
  7. James Henry

    James Henry In the Trades

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    Occupation:
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    Location:
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    I would think that if you put a check valve down stream of an RPZ you won't know if the RPZ has failed until the check valve fails and then its to late. I 've never heard of putting in a check valve specifically for an RPZ. They are a form of check valve.
     
    Last edited: Mar 3, 2021
  8. Paulypfunk

    Paulypfunk In the Trades

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    Cheap insurance
     
  9. Jeff H Young

    Jeff H Young In the Trades

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    Feb 27, 2020
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    My guess is is not prohibited . but I wouldn't recommend it. I'd build it though if on my detail
     
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