O-E Vapor System Manual
This manual was created by O-E Specialty Manufacturing Co. and outlines how to install the "O-E" Perfect System, which is a Vapor Vacuum heating system.
Danfoss One-Pipe Steam Control Valve Patent
Thanks to Gerry Gill for finding and sharing this patent for the Danfoss 1-PS valve. Note that the vacuum breaker is not yet a part of the valve.
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