January 01, 1970
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Outer ring grooving machine design for making groove of outer ring of spiral wound gasket, controlled by air pump. No longer expensive lathes need; one worker can see after more then 10 machines in same time.
Made through molding of flexible graphite sheet and 1100 series braided packings
Mainly made of USA or Holland-imported polyaramide ( a chemical synthetic filament of the strength 10 times that of steel), used for braiding of seal packing.
