| 摘要 |
A blowout preventer and a seal are disclosed for sealing about pipes or other objects in a well bore. The seal element is a semi-circular section of resilient compressible material having a semi-circular inner surface to engage the pipe and embedded radially disposed support elements having anti-extrusion members which serve in combination with overlapping ram block members to prevent extrusion of the resilient material from the top and bottom of the seal. The top and bottom anti-extrusion members are stair stepped and have interlocking fingers and recesses and are adapted to slide radially and circumferentially with an adjacent anti-extrusion member element as the elements move toward or away from the pipe in the well bore. Flanges on the seal element are provided with top and bottom plates each of which overlaps at least one support element.
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