| 摘要 |
<p>In a metal teeming sliding gate valve (10) for controlling the flow of molten metal from a vessel (12) the valve has a stationary valve plate (16a) with a teeming orifice (31), and a movable gate (16c) with at least one teeming orifice (36, 37) which is movable into registry with the teeming orifice (31) of the stationary valve plate (16a). The valve further includes means for injecting gas into the teeming orifice (36 37) of the movable gate (16c). This means for injecting gas is arranged stationarily and spaced from the teeming orifice (31) of the stationary plate (16a). Selectively, the teeming orifice (36, 37) may be moved into registry with the gas injecting means for an axial injection of gas into the teeming orifice (36, 37) in the gate (16c) when this orifice is not in registry with the teeming orifice (31) of the stationary plate (16a) the arrangement prevents gas striking and damaging the refractory bordering the gate orifice (36, 37). Gas may be fed into the gate orifice (36, 37) for diverse purposes including preheating, lancing and leakage control. </p> |
