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Relief valve leak

Mplumber1 Member Posts: 2
11/2 30psi relief valve leaking out of a side port that’s built into side ,when not discharging and only at 20 psi what do u think


  • Jamie Hall
    Jamie Hall Member Posts: 22,897
    Pressure relief valve? Pressure reducing valve? Backflow preventer? Pressure relief valves have one outlet. If it is leaking, it needs to be replaced. I'm thinking this is a backflow preventer, which may have a side test port.

    Picture? Or model number?
    Br. Jamie, osb
    Building superintendent/caretaker, 7200 sq. ft. historic house museum with dependencies in New England
  • Mplumber1
    Mplumber1 Member Posts: 2
    Trust me it a relief valve and has a side port
    EBEBRATT-Ed Member Posts: 15,302
    How do you know the relief valve is bad. What is the pressure gauge telling you?

    Could be a bad or waterlogged expansion tank
    or a bad pressure reducing valve leaking water into the system
    or a bad tankless coil or indirect water heater if you have one

    If the expansion tank is a compression tank drain it

    If it is a bladder tank isolate it or remove it from the system and check the air charge

    Try leaving the make up water valved off to the boiler