| 摘要 |
A top seal, ram assembly, blowout preventer, and housing for a blowout preventer are disclosed according to the invention in which outer anti-extrusion plates are provided at the ends of the top seal which are adapted for bearing against a surface of the blowout preventer housing. The housing of the blowout preventer is provided with a horizontal bore having a generally rectangular cross-section with thickened vertical wall sections in the proximity of the vertical bore through the housing. The thickened wall sections are adapted to cooperate with the outer anti-extrusion plates of the top seal in order to support the pressure created in the packer and the top seal when the rams are closed.
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