| 摘要 |
A rotary valve for teeming fluid metal is disclosed having a frame for securing the same beneath a metal vessel which has a working nozzle at its lower portion. A rotary gate carrier is provided within the frame, and a rotary gate is secured thereatop with one or more depending nozzles. The top plate is substantially coplanar with the rotary gate. The metallic case holding the rotary gate has one or more depending nozzle cases with inwardly extending locks. Nozzle extensions with recessed portions proportioned to permit insertion in concert with the locks in a bayonet fastener type relationship are provided whereby the lower nozzle extensions can be replaced. Desirably the nozzles in the rotary gate have different diameter bores thereby permitting different flow rates in accordance with erosion and clogging. The method of the invention is directed to the supplying of a top plate and bottom rotary gate for a rotary valve in which the top plate is assembled by securing two or more identical pieces together and providing a teeming opening or openings. Similarly the rotary plate is formed from the same identical pieces as the top plate, but securing therein nozzles preferably having different diameter teeming openings. The nozzle portion of the rotary gate is completed by providing for removable securing of nozzle extensions at the lower portion of the nozzles.
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