| 摘要 |
<p>There is disclosed an assembly for use in an annular blowout preventer of the type wherein a packer, received within a recess about a bore through the preventer housing, is adapted to be contracted by means of a piston having an annulus of resilient material movable inwardly within a chamber surrounding the recess and divided therefrom by a wall of the housing, and a disc-shaped member of resilient material extending through and sealably slidable within a slot in the wall to transmit the inward movement of the piston to the packer. The assembly comprises a packer and piston of particular design, also means of particular design interconnecting the piston and packer.</p> |
