Bleeder valve for pressurized furnace

Details Bleeder valve for pressurized furnace Bleeder valve for pressurized furnace

2007-01-26

2011-10-11

Kastler, Scott (Department: 1733)

Metallurgical apparatus

Means for treating ores or for extracting metals

By means applying heat to work, e.g., furnace

C266S196000, C266S199000

Reexamination Certificate

active

08034284

ABSTRACT:
A shaft furnace bleeder valve for controlling a gas outflow from the interior of a pressurized furnace to the ambient atmosphere through an exhaust conduit is proposed. The bleeder valve comprises a valve seat associated with the exhaust conduit, a movable closure member having a central closure surface and a peripheral sealing surface cooperating with the valve seat, the closure surface comprising a convex surface at least in proximity to the sealing surface. The valve further has an actuating mechanism, which is connected to the closure member for moving the closure member between a closed position on the valve seat and an open position distant from the valve seat. According to the invention, the closure member comprises a recurved deflection portion at the periphery of the peripheral sealing surface, the recurved deflection portion comprising a deflection surface inclined against the convex surface by an angle in the range of 30° to 70° for imparting to a gas outflow passing between the valve seat and the closure member a velocity component which is opposite to the initial opening movement of the closure member.

REFERENCES:
patent: 3601357 (1971-08-01), Legille
patent: 4158367 (1979-06-01), Mailliet et al.
patent: 2010/0201051 (2010-08-01), Lonardi et al.
patent: 152 949 (1921-03-01), None
patent: 59 197679 (1984-11-01), None
patent: 57 560 (1945-05-01), None
International Search Report; PCT/EP2007/050795; Jul. 4, 2007.
Tsapko V K et al: “Contct-Surface Geometry of Lock in Blast-Furnace Equalizing Valve” Steel in Translation, Allerton Press, New York, NY, US, vol. 30, No. 2, 2000, pp. 4-7, XP001143762; ISSN: 0967-0912.

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