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Mouat cleve O vapor trap

Lou S.
Lou S. Member Posts: 9
in Strictly Steam

Very old well kept mansion full of mouat vapor traps, out of the 50 or so 2 radiators not heating but more importantly, contractor tiled one bathroom and lost the trap to that locations radiator.been on here reading some on these items, big question is, anyone have one of these laying around or, I have read that radiator may work wo the trap or even read someone made a restrictor out of a drilled penny. Also I understand the incoming steam supply valve on the radiator is a special type, please enlighten me on these very old items, thanks, Lou

Comments

  • delcrossv
    delcrossv Member Posts: 1,919
    edited January 14

    Supply valve can be replaced by a Mepco SWRF-C regulating valve. I'd think a regular trap would work as well. With the regulator set up, it'd hardly ever close.

    https://www.mepcollc.com/product/swrf-c-regulator/

    Trying to squeeze the best out of a Weil-McLain JB-5 running a 1912 1 pipe system.
  • Jamie Hall
    Jamie Hall Member Posts: 25,624

    This ^^^^. Keep the pressure low if you can.

    Br. Jamie, osb
    Building superintendent/caretaker, 7200 sq. ft. historic house museum with dependencies in New England
    delcrossv
  • Steamhead
    Steamhead Member Posts: 17,619

    @Lou S. you need to fire that contractor. I would.

    All Steamed Up, Inc.
    Towson, MD, USA
    Steam, Vapor & Hot-Water Heating Specialists
    Oil & Gas Burner Service
    Consulting
    delcrossv
  • jumper
    jumper Member Posts: 2,415

    Drill the penny. If it works drill more pennies.

  • delcrossv
    delcrossv Member Posts: 1,919
    https://forum.heatinghelp.com/discussion/comment/1835121#Comment_1835121

    That makes a modulating rad single speed.

    Trying to squeeze the best out of a Weil-McLain JB-5 running a 1912 1 pipe system.
  • PMJ
    PMJ Member Posts: 1,273

    @Lou S. ,

    I have run a 1926 Mouat system for 32 years. It is a great system.

    The 3 ounces they claim in the attached literature is accurate. That is the highest pressure I ever see filling radiators part full even with only one 1/2 NPT vent for the whole system in a remote location. And that is with a boiler big enough that it barely needs to run 50% of the time to heat in design day conditions. Mouat designed the piping such that with part full radiators condensing it wouldn't require more than 3 oz at the header to deliver the steam. It is true. So I quickly found that the standard vaporstat control was essentially useless since there was no logical reason ever to fill radiators more than part full.

    Happy to discuss more if you wish.

    Also in there is a cutaway view of the return fitting.

    Mouat[1].pdf
    1926 1000EDR Mouat 2 pipe vapor system,1957 Bryant Boiler 463,000 BTU input, Natural vacuum operation with single solenoid vent, Custom PLC control
    reggi
  • Jamie Hall
    Jamie Hall Member Posts: 25,624

    Was sort of wondering where you'd gotten to, @PMJ ! Hi! And I will add to your comment — my Hoffman Equipped system runs at 3 to 4 ounces with much the same sizing relationship to heat loss (except for the odd polar vortex).

    Br. Jamie, osb
    Building superintendent/caretaker, 7200 sq. ft. historic house museum with dependencies in New England
    reggi

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