National boilers, radiators, and specialties: catalog no. 26 (1920)
National Radiator Company · National Radiator Company · leaf 80
ce check valvesin the return mains near the boiler to preventwater from backing out under pressure, asthe Honeywell Vapor Relief will relieve thepressure at twelve ounces without any pos-sibility of sticking. List Prices Honeywell Vapor Regulator for any size boiler , . ,$45 .00 Honeywell Vapor… … This device has the same electrical construction and is regu-lated in the same manner as the Minneapolis Heat Regulator —the only difference being in the extension. In connection with the motor, it controls valves, dampers,etc., for the regulation of hot water, steam, bake ovens, vul-canizers, etc.…
