This document is from the sales department at the Hoffman Specialty Co. in 1926. It showcases Hoffman Valves and Controlled Heat Equipment with cutaway diagrams of how the Hoffman No. 2 Vacuum Valve operates. There is also information on how to "vacuum-ize" a one-pipe steam system, the No. 7 Hoffman Adjustable Modulating Valve, Nos. 8 and 9 Hoffman Return Line Valves, the Hoffman Blast Trap, the Hoffman Ther-Kompo Gage, and the Hoffman Differential Loop. And there are diagrams outlining the typical installations of Hoffman "Controlled Heat" Equipment.
The Improved Webster Type "R" System of Steam Heating is a service bulletin from Warren Webster and Company (The Pioneers of Vacuum Steam Heating), established in 1888.
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.
Here is the original Installation and Operating Instructions and Parts List for The H.B. Smith Company's Oil Fired Cast Iron Hot Water Boilers (No. OHB-13W). This is esti...