Pressure Relief Valve

Discussion in 'Plumbing Forum, Professional & DIY Advice' started by terrell44, Apr 14, 2005.

  1. terrell44

    terrell44 New Member

    Apr 14, 2005
    Replaced pressure relief valve on 40g gas water heater about a year ago because of leackage from relief valve pipe. This did resolve the problem, but after only 1 year the problem is back. Any suggestions??
  2. breplum

    breplum Member

    Oct 2, 2004
    Plumbing and heating contractor
    San Francisco Bay Area
    Did you check house pressure. If it is high, that can be the cause. Next, is there a check vavle or pressure reducing valve without bypass? We find that even with bypass, there can be high pressure an expansion tank, properly installed and charged usually solves the problem.
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  4. hj

    hj Moderator & Master Plumber Staff Member

    Aug 31, 2004
    Cave Creek, Arizona

    More of the valves fail by not opening rather than leaking spontaneously. So you were probably just lucky that replacing it fixed the leaking, but you probably did not solve why it leaked. Either the heater temperature is too high, in which case you would usually get a flood rather than a drip, or the pressure is getting too high.
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