| 摘要 |
A valve apparatus for the precise regulation of a stream of molten material such as molten rock or slag as it issues from a primary melter or holding device, comprising a frame retaining a valve, the valve comprising a pair of plate-form valve members, one fixed and one movable with respect to the other, each having an aperture or orifice provided therein. Maximum rate of discharge occurs when the apertures are in juxtaposition, and flow cut-off occurs when the apertures are not in juxtaposition. Power operated means is provided for the movable valve member to obtain proper stream regulation or complete cut-off. The apertures are so contoured that, as the valve is moved toward closed position, the cross-sectional shape of the effective opening and the flowing stream of molten material remains substantially uniform and unchanged. Each valve member is formed of a plate of metal having an internal channel through which water is circulated to reduce the temperature of the valve member and to prevent its destruction by overheating.
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