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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.
Adjustable valves can be installed anywhere in your home and adjusted based on the distance from the valve to the boiler.
(based on 22 reviews)
of respondents would recommend this to a friend.
Most Liked Positive Review
I have an old house with a 1 pipe steam system. I had Hoffman 1A's on our radiators. They were always filling up with water, throwing the system out of whack and I...Read complete review
I have an old house with a 1 pipe steam system. I had Hoffman 1A's on our radiators. They were always filling up with water, throwing the system out of whack and I was emptying valves every day in peak heating season. I hated steam heat. These are amazing, huge venting capacity and almost never clog up. The radiators heat faster and the boiler burns for a shorter cycle (saving $$). It takes a little time to adjust them to get even steam distribution through the house. I recommend them 100%. Change all your vents out though, if you leave a few of the Hoffman's or other vents in, those radiators will fill much slower that the others (smaller vent size). 1 valve was defective, [...]
Most Liked Negative Review
Every system is different
It makes gurgeling noises. It seems to work fine. If you have very dry steam it may be the right choice. I would test a few of those prior of buying them in...Read complete review
It makes gurgeling noises. It seems to work fine. If you have very dry steam it may be the right choice. I would test a few of those prior of buying them in bulk.
Reviewed by 22 customers
Displaying reviews 1-10
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Stopped my radiators from hissing
from Bayside, NY
Comments about Varivalve Adjustable Angle Air Valve:
This works very well and quietly. The threads are better than cheaper vents, and they are also much quieter (no clanking). If your vents are releasing steam - you need to replace it with this!
Bottom Line Yes, I would recommend this to a friend
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I can use a Varivalve Adjustable Angle Air Valve to control the temp. in any room.
from port Jefferson, ny
Prior to using this product there was insufficient heat flow to several radiators. Now the heat is more than adequate. Thank you*
By far the best steam bleed valve
These valves are super quiet you don't even hear them when steam is building in radiators, even better they are variable with a manual slide adjustment to have even heating through out the house
Simple but very effective
By Herbie the Homebuilder
from Newport, RI
Don't let the little size of this product scare you. It does such a wonderful job and does what it claims. If you have steam heat then these really do help heat up the rooms faster and save energy bills.
from Wyckoff, NJ
These valves were recommended by my heating guy...they are the best for steam systems. Just throw some teflon tape or pipe goop on the threads and screw them in. Then adjust them accordingly. Easiest to use and most reliable steam vents!
Great product! Best Quality Valve
By Teacher with a wrench!
from Westchester, NY
Great valve because its compact and efficient
from Ozone park,ny
I had a problem with a radiator that wasn't heating up right away. Once I recieved this product and installed it. The radiator heated up so fast that I was amazed:).this product is just perfect:)
Best radiator valve ever!
By Judy the fix-it mom
from Boston, MA
We have a very old house with very old radiators. Many years ago a plumber gave us a couple of Varivalve air valves and they worked much better than the old ones we had been using. I hadn't been able to find them anywhere until I saw on line that Pex Supply had them. I highly recommend them to people who may have given up on ever getting their radiators to work again. They are adjustable, which also makes them much more efficient.
Tried and True!
from Wilmette, IL
I use these on single pipe steam radiators. They have little resistance so even the radiator in the far back of the house gets toasty warm, but it allows enough control that the radiators closest to the boilers can be tweaked for comfort. This is especially important since our 1940's boiler doesn't offer much control otherwise. I'm so glad I was able to find these!
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