Burner shut-off valve for hot blast stove

Claim 2

A burner shutoff valve comprising: a. a housing including upper, middle m, and lower interconnected portions; said middle portion having inlet and outlet openings for the passage of fluid through said valve, said inlet passage having therein a frustoconical axial conduit with the smaller end thereof disposed in the downstream fluid flow direction and a cylindrical conduit coaxial with said inner frustoconical conduit; b. a valve disc movably disposed within the housing; c. a valve seat on said housing with which said disc cooperates to make a seal that prevents the flow of fluid through said valve; d. a guide vane suspended below said valve disc and movable therewith; said guide vane having an outer cylindrical conduit and an inner coaxial frustoconical conduit with the smaller end thereof disposed in the downstream flow direction, the diameter of the larger end thereof being substantially equal to the diameter of the smaller end of the frustoconical conduit in said housing portion; e. opposed guide members vertically mounted to said middle housing portion; and f. means mounted to said valve disc that cooperates with said guide members to keep said valve disc in spaced-apart relation with respect to said seat during the opening and closing of said valve.

Claim 3

The invention of claim 1 wherein said valve disc is comprised of: a. spaced apart planar members joined together peripherally to form a hollow chamber; with b. guide vanes disposed arcuately within said chamber to provide a continuous arcuate fluid flow path; and c. means securing said guide vanes to said planar members in a way whereby said planar members can react unrestrictedly to thermal changes imposed on said valve disc without changing said fluid flow channels.

Claim 4

The invention of claim 1 wherein the outlet passage of said middle housing portion has therein cylindrical conduits that are coaxial with said frustoconical conduit in said guide vane, with the diameter of the inner conduit being substantially equal to the diameter of the smaller end of said frustoconical conduit of said guide vane, and with the diameter of the outer conduit being substantially equal to the diameter of the outer cylindrical conduit of said guide vane.

Claim 5

The invention of claim 3 wherein said guide members have lower offset portions which coact with guide pins to urge said valve disc laterally into a seating position with said housing.

Claim 6

The invention of claim 1 wherein said means on said disc includes guide blocks that cooperate with said guide members.

Claim 7

The invention of claim 5 wherein: a. said guide members are grooved vertical bars; and b. said guide blocks have pins that engage said grooved vertical bars.

Claim 8

The invention of claim 6 wherein: a. one end of said guide members is fixed; and b. the other end of said guide members if free to move vertically.

Claim 9

The invention of claim 1 wherein: a. said middle housing portion is comprised of front and rear hollow panels having internal baffles defining cooling fluid flow passages; and including b. means to conduct cooling fluid into and out of said panels.

Claim 10

The invention of claim 8 wherein the cooling fluid exiting from one panel enters the other panel and flows therein, and thereafter said cooling fluid exits said housing portion.

Claim 11

In a burner shutoff valve for a hot blast stove having entrance and exit passages in the housing thereof through which air and gaseous fuel pass in separate flow streams, the improvement comprising: a. a first frustoconical conduit disposed in said entrance passage with the smaller end disposed in the downstream direction of fluid flow, said conduit being a first portion of a venturi section in said valve; b. a cylindrical conduit in the exit passage; c. a guide vane adapted for positioning between said entrance and said eXit passages with said guide vane comprising, a second frustoconical conduit that is a second portion of said venturi section and that is positionable in coaxial relation to said entrance and said exit passages, with the diameter of the larger end of said second frustoconical conduit being substantially the same as the diameter of the smaller end of said first frustoconical conduit, and with the diameter of the smaller end of said second frustoconical conduit being substantially equal to the diameter of said cylindrical conduit of said exit passage; and d. a cylindrical conduit surrounding each of said frustoconical conduits, said cylindrical conduits thereby forming with the walls of said housing an annular passage for the flow of gaseous fluid around the flow of gaseous fluid inside of said frustoconical and exit cylindrical conduit.

Claim 12

In a burner shutoff valve for a hot blast stove having entrance and exit passages in the housing thereof through which air and gaseous fuel pass in separate flow streams, the improvement comprising: a. a first frustoconical conduit disposed in said entrance passage with the smaller end disposed in the downstream direction of fluid flow, said conduit being a first portion of a venturi section in said valve; b. a cylindrical conduit in the exit passage; c. a guide vane adapted for positioning between said entrance and said eXit passages with said guide vane comprising, a second frustoconical conduit that is a second portion of said venturi section and that is positionable in coaxial relation to said entrance and said exit passages, with the diameter of the larger end of said second frustoconical conduit being substantially the same as the diameter of the smaller end of said first frustoconical conduit, and with the diameter of the smaller end of said second frustoconical conduit being substantially equal to the diameter of said cylindrical conduit of said exit passage; and d. a cylindrical conduit surrounding each of said frustoconical conduits, said cylindrical conduits thereby forming with the walls of said housing an annular passage for the flow of gaseous fluid around the flow of gaseous fluid inside of said frustoconical and exit cylindrical conduit.