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Unusual radiator piping


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This hydronic heating system has been converted from gravity to circulated with a pump. This seems to be the original piping at the radiators. There is no pipe at the other end of the radiator. There must be some type of internal flow control for the water to circulate through the radiator. Anybody seen this before?

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I remember it being called a "Unique Valve" and I think it was made by Honeywell. It contains a double gate in the cylinder that either diverts water into the radiator in one position, or bypassing it when in the other position.

I think I have a diagram of this valve in a book somewhere. I'll look for it when I get done today.

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Here's an illustration from 500 Plain Answers to Direct Questions on Steam, Hot water, Vapor and Vacuum Heating: by Alfred King, published in 1915:

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I like the illustration in the link that Tom posted. Gee thanks Tom - now I have to locate and purchase that Honeywell booklet.

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That truly is a unique valve. Thanks, Bill.

And thanks, Tom, I have bookmarked the little Honeywell Booklet for a winter read. I wonder if some of their success in the business stemmed from their ability to explain so well how their systems worked? I can picture the family huddled around the stove while Dad read in the brochure how they were finally going to heat the whole house. [:)]

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