IMPROVEMENTS IN OR RELATING TO GATE VAVLES

摘要

1,209,062. Making valves. KOPPERS CO. Inc. 31 Oct., 1967 [14 Nov., 1966], No. 49518/67. Heading B3A. [Also in Division F2] Cooled gate valve, particularly for blast furnaces, comprises a housing 13, and hollow members through which cooling fluid is circulated, these members consisting of a valve disc 17, separate seat members 19, and a U-shaped shield 137 surrounding the gate. The cooled parts are constructed as follows:- Valve disc.-Consists of two half-discs 25, 27. Each half-disc is made from two conventional flanged-only steel heads 29, 31. These are fixed together in spaced relation to form a cavity 83, by studs (45) welded to both heads. A series of these studs is slotted to receive a spiral baffle (55). The half-discs are first assembled together by interengaging screw-threaded sleeves (63, 65) welded to the respective half-discs. Next the abutting inner heads 31 are welded together through a gap between the outer heads 29, and the gap is closed by a ring 75 welded in place. Cooling water enters the spaces between the heads 29, 31 through a pipe 69 and flows thence into the interior of the disc through openings 59 and out through a concentric pipe 78. Drain holes 81 and a central tube 79 enable the disc to be emptied of water. Valve seat and heat shield panel.-Comprises a hollow fabricated annular seat 87 with a concentric baffle 127. A hollow partitioned shield 85 is welded to the seat through partitions 95e, 103 with junction plate 129, 115a, and 95a. The panel is constructed to provide a labyrinth coolant flow path as shown, with an inlet 109 and outlet 110. To allow for thermal expansion, baffles are formed of four pairs of slightly spaced walls 91b, 91c. Each wall of a pair is connected at one end to a separate top or bottom plate such as 99c, 117c, as shown, and the two walls of each pair are connected at their free ends by a slit tube (101) inserted over and welded to the walls, to form baffles. An air vent tube 191 is provided for the top of the seat. When assembled in the valve, the seat is secured against the casing by eccentric cams (190), Fig. 14 (not shown). U-shaped heat shield.-Consists of a hollow member surrounding the interior of the housing 13 in the region of the disc. This member has inlet and outlet coolant connections 163 at the top ends thereof and baffles (159, 161), Figs. 8 and 9 (not shown) are provided at these ends.