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The venting capacity of radiator air vents and main line air vents used in single pipe steam heating systems has an important effect on the operation of these systems. In order to obtain a better understanding of these effects, The Center for Energy and Environment conducted experiments both in the laboratory and in the field to investigate the properties of single pipe steam air venting. Commercially available radiator and main line air vents were tested and compared. Main line air vents in one building were replaced with open pipe orifices of different sizes, and the resulting fill characteristics of the main steam lines were observed. The purpose of the main line air vent is to rapidly vent the relatively large quantity of air in the main lines. This allows the main lines to fill more quickly and thus reduces the time difference of steam arrival at the different risers. A larger orifice allows the air to be pushed out at a lower back pressure.
The function of the radiator air vent is to provide a means for air to be driven out of the radiator as steam enters. At a given pressure the fill time of a radiator varies proportional to its heat capacity and inversely proportional to the venting capacity of the radiator air vent. It is possible to control the speed at which a radiator will fill with steam by installing a radiator air vent with a certain venting capacity. Used in this manner, radiator air vents are helpful in evening out the heat distribution in a building.
(based on 7 reviews)
of respondents would recommend this to a friend.
Reviewed by 7 customers
Displaying reviews 1-7
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As advertised, although pricey
from Holyoke, MA
Comments about Varivalve Adjustable Straight Valve:
The vari-valves do what they're intended to do--they adjust speed of steam release, however, at least with direct mount Danfoss thermostatic controllers there can be significant spitting & gurgling. The design of this valve eliminates hissing, but if the steam flow's not dry vari-valves will gurgle audibly. Have done quite a bit of serious canting of radiators to drain condensation toward the steam pipe, but it does not help if the flow is wetter than it should be. But that said, the basic principal of the device is sound.
Bottom Line Yes, I would recommend this to a friend
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Great, when it works.
By Joe the Swimmer
from New York
I bought 10 of them six years ago. Unfortunately most failed after 2-4 years. They were stuck shut, useless.When they don't fail, they work extremely well, so I just ordered a few more hoping that the first ones had a defect and the new ones will be from a better batch.
I would buy this product about.
from 261 5th ave
I like the automatic air venting on this product I work on a lot of heating systems that need manual air bleeding you don't have to do anything once you install this product it just works great on radiators & baseboards systems.
varivalve steam vent
from Harrisburg, PA
I recently tested 3 new installed vents in my steam system and they work quickly and efficiently. The adjustability is what led me to this product. This allows adjustment depending on radiator proximity to the source.
Easy adjustability for air flow
from Weehawken, N.J.
Great updated look for new slim line radiators with the same quality found in traditional valves.
from Hartford, Conn.
I use those as main vents. They release a small amount of steam before shutting off. I have no problem with that. I would buy it again.
My single pipe system is a lot quieter
The little valves work great. Very quiet.
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