| 摘要 |
A grooved rolled threaded flange of special grooved geometry ( 101 ) consisting of a grooved flange outwardly extended within this grooved a gasket ( 102 ) is housed of special grooved geometry which is placed between the drum top ( 103 ) and the grooved flange the gaps ( 104 ) towards the top is filled up by the gasket while tit moves upward thereby sealing the flange with the drum top.
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