4A Valve

Steamhead (in transit)

very small systems where the length of the main is less than 15 feet or so of 2-inch pipe. I can't count the number of these miniscule things that I've taken off and replaced with Gorton #2 vents.

Get Gerry Gill and Steve Pajek's e-book on balancing steam systems, it has all the charts you need. Order it on the Books and More page of this site. All proceeds go to charity.

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JimmyJam_2

Has anyone used

a Hoffman #4a on a main before?? or just 75's? Hoffmans web site recommends 4a's for residential and small systems, but I don't see them around that much.

Bob W._3

Had them on mine once. They don't vent much.

Raph

Thanks Steamhead

I'll check that out........