| 摘要 |
The present invention concerns a stopper rod whose gas tightness and rigidity are improved. In particular, the stopper rod of the present invention has means for maintaining the compression of the sealing gasket (11, 11') in contact with the annular sealing surface (10) of the body of refractory material when the stopper rod is brought to a high temperature. According to one embodiment of the invention, these means are furnished by a sleeve (12) comprised of a material with a high coefficient of thermal expansion, the dilatation of which maintains the sealing gasket under compression when the stopper rod is brought to a high temperature.
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