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vent air valve for mains 1 pipe sys

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Daniel_3
Daniel_3 Member Posts: 543
To increase the venting capacity since four no. 1's = one no.2. There has been some venting capacity charts performed which can be purchased through the heatinghelp.com store to show the actual venting characteristics and comparisons of many steam vents on the market today as well as those not on the market today. Pro's here would most likely correct me since I may be off a bit but a Gorton no.2 on the 50 and 52' mains is definitely the way to go since a Gorton no.1 will not be able to vent the square footage of those mains fast enough. Maybe two no.1's on the 28' main would be better. I have two mains 30' and 33'. I will be placing a Gorton no.1 on the shorter main and a no.1 as well as a Hoffman 45 on the longer to have a close to equal venting rate for each main. My mains are 2", yours being 2 1/2" need quite a bit of venting, especially at over 50'!

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  • Anthony_20
    Anthony_20 Member Posts: 6
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    vent air valve for mains 1 pipe sys

    I have a one pipe steam system, with 3 mains all are 2.5" in diameter, 1st is 50' in length with a, 1/2 drilled hole on the side, at the end of the main, with short nipple screwed in with some kind of harden pipe dope, an elbow on the other side of short nipple, a 4" nipple and a Gorton valve #1 came loose when I unscrewed the Gorton #1 vent valve, (which was clogged) fresh treads will screw back in. 2nd is 28' in length. 1/2 hole at end of main same as above, except 2" nipple form elbow and had a dole vale No.1933. (Clogged) 3rd is 52' in length, has 12” factory female on 2.5" elbow at the end of the main. 2" nipple and I can only read the No. 45 on the valve (which I Can still blow air trough it) can any please point me in the direction of what size valves I need and the best name brand? Was thinking about Hoffman 75 ?
    History, sorry I guess I should have started with this. The house was build in 1901 had coal boiler that was converted to oil. We bought the house in 1965 then a whole new boiler was put in 1967 it was oil fired, then converted to gas.
    p.s. how know what size vent to put on the radiators?, my house has 3 floors, but I read it goes by size of radiators. which brand would be the best?
  • Daniel_3
    Daniel_3 Member Posts: 543
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    My two cents would say a Gorton no.2 on the 50' main, a Gorton no. 2 on the 52' main, and lastly a Gorton no. 1 with a Hoffman 45 on the 28' main. You can size the rad vents by Gorton's charts on their website or go with Heat-timer varivalves and adjust to suit your comfort needs. If you get the Heat-timer be aware that they did have a manufacturing flaw in several of their vents as someone here has mentioned before. I have em and I love em.
  • Anthony_20
    Anthony_20 Member Posts: 6
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    why two vents? Gorton no. 1 with a Hoffman 45 on the 28' main
  • Anthony_20
    Anthony_20 Member Posts: 6
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    vent air valve for mains 1 pipe sys

    Thank you, Daniel
  • Anthony_20
    Anthony_20 Member Posts: 6
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    vent air valve for mains 1 pipe sys

    p.s. what do you think about, Hoffman 75 vent
  • Daniel_3
    Daniel_3 Member Posts: 543
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    Don't know the venting capacity of that one but it is less than a Gorton no. 2 and much much more expensive.
  • gerry gill
    gerry gill Member Posts: 3,078
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  • Steamhead (in transit)
    Steamhead (in transit) Member Posts: 6,688
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    I'll second that

    but if you want to cut to the chase, Daniel's recommendation should work fine. Get Gerry's e-book anyway, to size your radiator vents.

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