HOT BLAST VALVE OF BLAST FURNACE AIR HEATERS Russian patent published in 2008 - IPC C21B9/12 F16K49/00 

FIELD: ferrous metallurgy, namely designs of hot blast valves of blast furnace air heaters.

SUBSTANCE: valve includes water cooled lined lock disc, water cooled lined housing having lid, mouth portion, attached flanges and cylindrical portion inside which stop rings restricting inter-ring space for placing lock disc are arranged. At each side of inter-ring space in housing there are two annular ducts for water used for cooling stop rings and attached flanges. On lateral outer surface of housing ducts for cooling water are mounted. In lower portion of housing at each side of inter-ring space branch pipe with two openings is mounted in order to partition duct for water that cools attached flange. One opening of said branch pipe is connected with system for supplying cooling water and with duct for cooling stop ring. Second opening is connected with duct for cooling flange and with duct for cooling water on lateral outer surface of housing. On each front outer surface of mouth of housing there is duct for cooling water connected with duct on lateral outer surface of housing.

EFFECT: increased period of useful life of valve.

4 dwg