steam radiator valve hole sizes?

Discussion in 'Boiler Forum' started by bbillcee, Jan 5, 2010.

  1. bbillcee

    bbillcee Member

    my 2nd floor tenant was having some heat issues and i checked and a couple radiators and they were getting 50% hot and slowly heating

    i worked at a boiler guys place and he gave me some gorton size "d" valves and said to put them on....does this seem correct?

    Also, i have a radiator in a first floor vestibule that is burning with heat and it appears to have a size "d" on it....if i put a smaller hole valve on there will it get less hot? its also pretty close to the boiler

    its a vestibule it doesn't need that much heat wasted there
    Last edited: Jan 5, 2010
  2. frenchie

    frenchie Jack of all trades

    What size are the vents that you're replacing?

    If you want less heat output, replace that radiator with a smaller radiator.

    If you reduced the size of the vent enough to interfere with that rad heating - not that I'm sure that's entirely possible, but speaking theoretically - it'd also interfere with the heat traveling further, to the next rads on that line.

    Peter - if you're reading this - might be amused to hear that last night, the vent by my desk was audible, for a minute or two.
  3. bbillcee

    bbillcee Member

    i cant tell what size they are...they look like some sorta adj from like 1940...they say detroit lubricating company:confused:

    the one i the vestibule is the last one on that line... i put a 4 on still works good
  4. dsorkin

    dsorkin New Member

    New Jersey
    If it is a two pipe heating system there could be a trap that needs to be replaced or incorrect pitch somewhere. I do not think the size of the vent would prevent the radiator from reaching the proper temp, a smaller vent hole would just take longer but would still fill with steam. Rather than replace with a smaller radiator a cheaper way to reduce the heat output is to partially insulate the radiator using fiberglass and a radiator cover.
  5. nhmaster3015

    nhmaster3015 Master Plumber

    The granite state
    Steam systems need to be balanced. Obviously the radiators that are furthes from the main, heat up slower than those that are closer. However, by sizing the radiator vents properly, quite a bit of that can be alleviated. Those radiators closest to the main should have smaller opening vents installed, or adjustable vents. If you want no heat at all then either shut off the valve ( if equipped ) or take the vent out and plug the hole with a 1/2" plug. If the radiator can't vent, it gets no steam. If the system is two pipe, then there is always a good chance that either the radiator trap is bad ( very common ) or the condensate return pipe is plugged or partially plugged. (also common)
  6. hj

    hj Moderator & Master Plumber Staff Member

    Cave Creek, Arizona
    Adjustable vents control how FAST the radiator heats up, not how hot it gets. A larger opening will vent the air faster so the radiator would get hot quickly, while a smaller one slows it down. The intention was that when properly adjusted all the radiators would get hot at about the same time.
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