United States Radiator Corporation · United States Radiator Corporation · leaf 140
rely by the expansion and con-traction of air. Automaticallyvents the air from the radiatorand at the same time is arrangedso that the valve closes againstthe ingress of air when the pres-sure goes down. The Norwall Syphon Air Valveis constructed the same as thevacuum valve illustrated, exceptthat… … 139 UnTted jStates Radiator (orporation GLEVAUG SYPHON AIR VALVES
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