Abstract: A rotary valve for controlling the discharge of molten metal in a substantially downward direction from a metallurgical vessel includes a refractory rotor rotatable about a substantially horizontal axis. The rotor has an outer peripheral surface, either conical or cylindrical, arranged symmetrically about the axis, and the rotor has therethrough a flow channel having inlet and outlet ports, at least the outlet port opening onto the outer surface. A refractory stator has therein a recess defined by an inner surface, either conical or cylindrical, complementary to the outer surface of the rotor, the stator having therethrough a discharge channel. The rotor fits within the recess in the stator, with the outer and inner surfaces thereof being complementarily positioned symmetrically about the axis.

Abstract: A refractory plate assembly includes a refractory base structure having therein a recess and a refractory wear and erosion resistant insert positioned within the recess. A frame surrounds the outer periphery of the base structure. The insert and the base structure together define a planar sliding surface. The base structure is formed of at least two components divided along at least one joint extending transverse to the planar sliding surface, each such component defining a respective portion of the recess and surrounding a respective portion of the circumference insert. The insert is elastically clamped within the base structure and may be removed from the base structure for replacement.

Abstract: A sliding closure unit includes a pair of spaced guide members and a discharge control member movable between the guide members. The control member has therethrough at least one discharge opening to be moved into or out of alignment with discharge openings through the guide members. The control member is formed of a ceramic fiber material.