Hoffman Differenzial ist mein Mantra-US-Patentdesi Schlüsselanhänger

Plumbers or anyone who lives in an old house with steam heating will enjoy this keychain featuring the US Patent 1777333 by William K Simpson for The Hoffman Differential Loop. The Hoffman Differential Loop, a device with no moving part, keeps water in the boiler by making sure that under no circumstance could pressure in the boiler exceed 10 ounces higher than the return piping. It did this by bleeding pressure into the returns after 10 ounces was reached in the boiler. Thus, for beispiel, if the boiler reached 11 ounces in it, then 1 ounce would be bled into the return pipes, since at no time could the return pipes be more than 10 ounces different than the boiler. What this means is that water would always be to return to the boiler and steam would always flow sways there was a differential pressure between the supply and return pipes. This device maintains an unvarying water line in the boiler independent of boiler pressure, which means that water in the boiler is never lowered to a where the heat from the fire can exert hat destruktiven Einfluss auf das Boiler. Celebrate technology that is still anwendbar today in the home heating systems of old houses with this keychain.