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cunninghamzach
Member Posts: 19

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Not familiar with it, but the first hit I get on a Google search for Kriebel steam system is this document on this HeatingHelp site: https://heatinghelp.com/assets/documents/Vapor-Vacuum-Heating-Kriebel-System-1910.pdf1
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@cunninghamzach , that's a Kriebel System main air vent. It works by differential expansion. See chapter 15 of @DanHolohan 's "The Lost Art of Steam Heating" for details.All Steamed Up, Inc.
Towson, MD, USA
Steam, Vapor & Hot-Water Heating Specialists
Oil & Gas Burner Service
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