vintage 'Plural-Stage' Air Filter from Graham White no. 918 -- circa mid 1970s -- filters air for air brake systems in trucks or other compressed air streams -- pretty ingenious the way it 'spins' out oil in the air stream with the spiral coils --
-- moderate wear to the exterior -- not sure what is inside the rest of the unit, but the chamber I removed was filled with filter medium which consisted of probably powdered activated charcoal covered with a layer of grease [it was discarded] --
-- *info from the patent: graham white patent no. US3890122A [US3402529] 1975 Plural-stage air filter assembly "plural stage assembly for filtering compressed air, wherein sequential centrifugal separation, condensation by cooling with arrest of cyclonic flow and filtering through a filter medium, the air passed through the assembly is substantially free of contaminants."
"This sequential filtering is performed in a housing of detachably connected upper and lower parts with periodic draining of collected contaminants from a sump in the lower part through a drain valve suspended therefrom. Receiving air directly from a compressor, the assembly has check valves at air inlet and outlet ports, the former for preventing damage to the compressor and the latter for maintaining reservoir pressure, when the draining is not limited in duration."* --
-- Free Local pick-up is an option. Out-of-country buyers are welcome, but overseas shipping is more.
Each week we post a number of interesting items that have been purchased from Oregon Estate Sales-shipping can be recalculated and combined with multiple purchases-please let me do the calculating for combined shipments before paying.