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Straight shank vent

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DWood
DWood Member Posts: 60
in THE MAIN WALL
to do as you said, nipple, el, vent, etc. I guess I find that typically you don't have a lot of room for "piping" and most people want to keep the operator assembly as small as possible. Good luck.

Comments

  • John S.
    John S. Member Posts: 260
    Who makes a good one?

    Just received my one-pipe Danfoss TRVs today and it looks like I can't install them until I get some straight shank radiator vents. I'm curious as to why. Maybe a potential condensate 'pooling' issue?

    Does Gorton make some? Hoffman?

    On that note... what is the correlation between vent size for balancing and TRVs? If TRVs are used, does that mean that vent sizes aren't quite as critical? For example could you use a larger vent and rely on the TRV to handle the rest?

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  • Sean_11
    Sean_11 Member Posts: 21


    John,

    Recently installed a couple of these in my home, wound up going with Hoffman 41 straight vents, mainly because I liked how they looked on the TRVs. Gorton also makes their vents in straight shank form I believe. Danfoss makes a vent for your 1PS TRV as well.

    As far as the balancing issue, take this for what it's worth from a homeowner who is also in the HVAC trade. From what I've seen of my TRVs in action, in regulating the temperature they act like adjustable vents. The operators will determine how quickly and how much steam will enter the radiator based on the temp of the room. On a one pipe system, it seems that the TRVs themselves become the de facto "vents," with the real vents just being there to ensure positive shutoff after the rad fills with steam.

    I've been happy with my purchase for the comfort alone. If the TRVs save on fuel consumption and recoup their own costs, I'll be thrilled, but the comfort factor was what sold me. Steamhead recently posted to this forum regarding a job he did where Danfoss "sponsored" the installation of TRVs in a house. I'll be interested to see if there is a $ payback in that installation, but again, in my home, the comfort has been greatly improved, so I'm happy with that.

    Best regards,

    Sean
  • Bob W._3
    Bob W._3 Member Posts: 561


    Hoffman makes the 1B adjustable straight shank. If you have good angle vents, why can't you just put a 1/8" nipple and 90 deg Ell on the valve body and use your old vents? I wouldn't use a Hoffman 41 because its the straight shank equivalent of the Hoffman 40; too slow for my tastes. YMMV.
  • John S.
    John S. Member Posts: 260
    Thank you both...

    Bob, I was just thinking that before I read your post. I have brand new Maid o'mists (adjustable by changing orifice caps) that I'd like to continue to use.

    Sean, thanks for your input. I feel much better about forking out that much $ now after reading your comments about comfort. I hope also to stay in better balance between mild and severe weather.

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  • Sean_11
    Sean_11 Member Posts: 21


    John,

    Either way, think it'll be fine. The point I was trying to make about the TRVs and venting is that I'm wondering if the vent you wind up putting on the valve becomes less important since you are already throttling the rate at which the air vents via the TRV. But since you have adjustable vents, it'd be interesting to see if it does make a difference.

    Best regards,

    Sean
  • Steamhead (in transit)
    Steamhead (in transit) Member Posts: 6,688
    Sean, I just talked to her

    she says it looks like her system is using even less oil with the TRVs, and will send me some figures after the next delivery.

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  • Sean_11
    Sean_11 Member Posts: 21


    Frank,

    Thanks for the update. I'll be anxious to read more. I think the TRVs are terrific.

    Great job in that home, btw. Quality pays for itself.

    Best regards,

    Sean
  • John S.
    John S. Member Posts: 260
    Vents

    Sean,

    That was my point exactly. Say I put very large vents on the TRVs upstairs. I would think that those risers would still heat the fastest, however, the vent would close (or modulate) after the TRV sensor is met. After which, the other risers would heat quicker?

    I'm curious too, if TRVs would help a situation where a boiler in undersized? I have been putting off rplacing my boiler since adding an addition (and radiation) simply because there's nothing wrong with it other than not quite being able to heat all the rads all the way across. It is livable, however, by using the TRVs say with large vents, I wonder if that could be the equivilent of cutting down some of the load after the TRV is satisfied?

    It's a very dynamic subject in my (rookie) book. I'm looking forward to experimenting with them and will post my findings.

    Thanks again for your input.

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  • DWood
    DWood Member Posts: 60
    You need to use

    the straight shank vents with the Danfoss one pipe steam TRV's. If the valve body is rotated so the vent is not located at 12 o'clock position, the check valve will not function properly and you will have an overheat problem. Just a word of caution. thanks for using Danfoss
  • Bob W._3
    Bob W._3 Member Posts: 561


    dwood, thanks for the info. As long as the valve body is located in the proper position, couldn't you use a nipple as a riser, an ell and an angle vent (with the vent in the correct position as well)?
  • RonWHC
    RonWHC Member Posts: 232
    Not sure an adjustable

    or large volume vent is desirable on a 1-pipe TRV.

    Looked @ a dozen apts in a 1-pipe building this week. All rads had Danfoss TRVs. The painters had been there, of course. However, the complaint I heard the most, was noisy venting when the TRV opens. This is w/ 2# on the system when the Heat-Timer cycles on. All of the vents, but 2, were the originals.

    The burner already cycles too often (double sized boiler w/ burner @ lowest rated input). A vaporstat (reduce the pressure) could make the cycling problem worse. So, we are looking for the lowest capacity vertical vents we can find.
  • Bob W._3
    Bob W._3 Member Posts: 561


    That would definitely be the Hoffman 41. I have 4 Braukman TRV's on back order and will first try them with 1A's; will report back on how well they work.
  • Steamhead (in transit)
    Steamhead (in transit) Member Posts: 6,688
    If you need a smaller one

    Gorton makes the #4 in a straight-shank version with 1/8" threads.

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