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Thread: pressure valve keeps discharging

      
   
  1. #1
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    pressure valve keeps discharging

    i have a weil mclean hydro system i have been noticing for some time now the pressure releif valve on the side of the boiler keeps dischargings.i keep a bucket under it and noticed everyday its full and sometimes overflows.help me please

  2. #2
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    High pressure can be caused by a faulty expansion tank , fill valve and also of course a bad relief valve , or a combination of these things .

    If your boiler has a domestic hot water coil for domestic water purposes, the chance also exists that the coil may have an internal leak as well, this is rare but does happen .
    Hope this helps you
    Heating Instructor

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    As the Heating Instructor said; it could be a number of things causing the relief valve to discharge.

    I would start testing the re-fill/pressure reducing valve, then to the expansion tank and relief valve, replace as needed.

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    Peron ally I would look at the tri i(gauge) ndicator and see if the pressure actually gets up to 30 PSI.

    This is the easiest way to tell if indeed the pressure is high and not just a defective relief valve .

    Then follow other steps like flooded expansion tank, defective feeder , leak in tankless coil etc
    S. Tieger plumbing Co Inc.
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    Same problem here!

    Quote Originally Posted by Sylvan Tieger
    Peron ally I would look at the tri i(gauge) ndicator and see if the pressure actually gets up to 30 PSI.

    This is the easiest way to tell if indeed the pressure is high and not just a defective relief valve .

    Then follow other steps like flooded expansion tank, defective feeder , leak in tankless coil etc
    Could you elaboration on a few of the above?
    (tri indicator pressure) does seem to fluctuate and go down below 20 or so?
    How do check deffective feeder?
    Should I check and measure air pressure in the expansion tank?
    And what should that read & indicate?
    PS I have manually let off some water on relief valve and seemed very easy? The whole system is only a few years old.

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    Re: Same problem here!

    Could you elaboration on a few of the above?
    (tri indicator pressure) does seem to fluctuate and go down below 20 or so?

    As the temperature rises so does the pressure

    How do check deffective feeder?

    You can feel the feeder and if it is constantly cold then you know water is flowing through it IN some cases I shut the automatic feeder and watch the gauge, mark the gauge with a wax pencil make the boiler cycle on and see how high the pressure does go, once it reaches the limit (temperature set) then open the automatic feeder and see if the pressure increases.


    Should I check and measure air pressure in the expansion tank?
    And what should that read & indicate?

    Not a bad idea BUT you CANNOT get a accurate reading as long as it is
    under system pressure

    PS I have manually let off some water on relief valve and seemed very easy? The whole system is only a few years old.[/quote]

    I really think you should hire a professional to go over the system and they can explain what has to be done.

    Just make sure the contractor is licensed and has insurance
    S. Tieger plumbing Co Inc.
    Bronx , New York 10471
    718 601 6299

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