Welcome! Here are the website rules, as well as some tips for using this forum.
Need to contact us? Visit https://heatinghelp.com/contact-us/.
Click here to Find a Contractor in your area.

Brand New Vents Leaking - Help !

I put a brand new set of name brand vent valves on my single pipe steam radiators, and many of them are leaking steam under pressure.

I have a brand new boiler with a vaporstat and a 3 PSI gauge. The pressure never goes above 1 PSI.

The vents start to leak as the system begins to get to pressures over about 6 oz.

I have removed the vents and filled them with alcohol shaken then emptied then filled them with water shaken then emptied.

I have used teflon tape to make a tight seal when mounting.

The steam comes out of the vent hole, not the threads.

I am at a loss. Is the quality control on vents so low that you have to go through vent after vent to find one that lasts longer than one boiler cycle? What is happening here? Help please!


  • Steamhead
    Steamhead Member Posts: 16,842
    Once in a while

    every manufacturer has problems with quality control. How they handle it is what counts. Get in touch with them and tell them what happened.
    All Steamed Up, Inc.
    Towson, MD, USA
    Steam, Vapor & Hot-Water Heating Specialists
    Oil & Gas Burner Service
  • SteamHeat
    SteamHeat Member Posts: 159
    Tried Another Brand.

    I tried another brand, (a much lesser brand) from a local home repair center. This resolved some of the leaking rad vents. But there are some still leaking steam with the new brand vent valves. I am stumped. Can this have anything to do with a need for skimming ???
This discussion has been closed.