| 摘要 |
A blow out preventer (10) includes a housing (40) defining a longitudinal throughbore (16) and a ram cavity (34) and at least one pair of opposed rams (12,14) located within the ram cavity, each ram including a seal (18,24) disposed on an upper surface (20,26) of the ram, the at least one pair of rams being movable from a first position wherein the throughbore is open to a second position wherein the throughbore is closed. At least one seal seat (30) is arranged in the ram cavity, a seal seat being associated with each pair of rams. The at least one seal seat has a seal surface for continuously engaging with the ram seals as the at least one pair of rams moves from the first position to the second position.
|
