CPC E21B 34/063 (2013.01) | 20 Claims |
1. A frangible disk configuration comprising:
a housing;
a sleeve in the housing;
a releaser, releaseably retaining the sleeve in a fixed position relative to the housing; and
a frangible disk mounted in the housing in a position contactable, without impact, by the sleeve after release by the releaser, the sleeve exerting a contact pressure on the frangible disk to rupture the frangible disk, during use.
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