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VentRite #75 capacity?

JeffM
JeffM Member Posts: 182
in Strictly Steam
I've got two main loops on my one-pipe steam system, both of which currently have Vent-Rite #75 vents on them. I'm wondering what the venting capacity of these vents is? They seem a little slow to me. I've got a copy of Gill & Pajek's booklet but it lists the #75 as obsolete, so I'm not sure whether what I've got is the same as listed in there or not. They look new.

One main has 1.1 cubic feet of air in it, the other has 1.6 (so not hugely different, but not the same either). The longer one takes a good deal longer for the main vent to close, but I think that's also partly due to it having most of the second floor radiators on it (some of which have larger vents on them). I'm thinking about adding larger main vents, though the system seems pretty well balanced at the moment.

Comments

  • Rod
    Rod Posts: 2,067
    Main Vents

    Hi- Since you have the Venting Book you can see the VentRite 75 is pretty slow (about 1/3 of a Gorton #1)  I think you would benefit by installing more main venting. If they are in good shape keep the 75s and install them and a Gorton #1 on an "antler" on each steam main.

    - Rod
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