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Thread: TPR Valve

  1. #1
    Join Date
    Aug 2012
    Location
    Columbus, Ohio
    Posts
    89

    Default TPR Valve

    Found this on a water heater today. It is unlike any TPR valve I have seen. It has "CGA" on it which to my experience means compressed gas. Anyone know what this is?
    TPRvalve.jpg

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  2. #2
    Join Date
    Mar 2007
    Location
    Fletcher, NC
    Posts
    28,032

    Default Re: TPR Valve

    That looks like an old ... VERY OLD ... temperature only ... relief valve (but the CGA is confusing, maybe it is a newer pressure only relief valve - my recollection is those old temperature only relief valves did not have that adjusting screw in the bottom of them as there was no 'adjusting' them),

    It contains a lead pellet which melts at temperature and ... theoretically ... opens the relief valve.

    I say "theoretically" because they are know not to work - the lead pellet melts, but the mineral deposits which have built-up inside the valve block the valve anyway.

    The way to test them ... use a torch and heat the valve up from the outside until the lead pellet melts and see if the valve opens or is blocked ... of course, though, it is a one-time valve because after the lead pellet melts ... the valve needs to be replaced.

    If it is a CGA pressure only valve which someone replaced on of the old temperature only relief valves with ... it still needs to be replaced ... along with the discharge line, and the ... (nothing is correct with that as shown).

    Now, to make sure, there is no other relief valve installed, correct?

    If there is another relief valve installed, then that may be a pressure only relief for thermal expansion ... just sayin' ... IF ... there is a proper Temperature and Pressure relief valve installed ... IF ...

    Last edited by Jerry Peck; 02-15-2017 at 04:35 PM. Reason: speelin' and such
    Jerry Peck
    Construction/Litigation/Code Consultant - Retired
    www.AskCodeMan.com

  3. #3
    Join Date
    Aug 2012
    Location
    Columbus, Ohio
    Posts
    89

    Default Re: TPR Valve

    Quote Originally Posted by Jerry Peck View Post

    Now, to make sure, there is no other relief valve installed, correct?

    If there is another relief valve installed, then that may be a pressure only relief for thermal expansion ... just sayin' ... IF ... there is a proper Temperature and Pressure relief valve installed ... IF ...
    No other relief valve. The water heater was manufacture in 1986 so they have gotten their money out of it. I will recommend replacement. Thanks


  4. #4
    Join Date
    Feb 2009
    Location
    Southern Vancouver Island
    Posts
    4,607

    Default Re: TPR Valve

    Mr. Handy pulled that valve off the very old original copper tank.
    So yeah, they could possibly cough up $12 now for a new TPRV.

    John Kogel, RHI, BC HI Lic #47455
    www.allsafehome.ca

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