bleed valve leaking

Discussion in 'HVAC Heating & Cooling' started by r lawson, Sep 6, 2008.

  1. r lawson

    r lawson New Member

    Feb 25, 2008
    new runtal towle warmer bleed vale leaks w/30 psi air test
    do these radiators incorporate a float ball inside also, actuated by the water level?
    thanks any help would be appreciated
  2. nhmaster

    nhmaster Master Plumber

    Jul 30, 2008
    Tech. Instructor
    S. Maine
    Are you saying you put 30lbs of air on the system?
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  4. r lawson

    r lawson New Member

    Feb 25, 2008
    30 psi in the loop befor connecting to manifold
  5. Furd

    Furd Engineer

    Jul 3, 2007
    Retired energy systems engineer
    Wet side of Washington State
    You may have a vent with a hygroscopic disc and if so then yes, it will leak slightly on air pressure. If you have a float-type vent it will definitely leak with air pressure.
  6. Redwood

    Redwood Master Plumber

    Dec 15, 2007
    Service Plumber
    After much research I found the answer in a copy of...
    "Common Sense" Written by Thomas Paine January 10, 1776

    The vent is designed to eliminate air from the system.
    Therefore it would be an entirely reasonable assumption that it would not contain the air pressure in the system during testing unless it was capped or otherwise prevented from doing its intended job.
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