| 摘要 |
<p>Apparatus is provided for use with a blowout preventer (8) having a housing (9) with a bore (10) therethrough and chambers (11,12) which intersect the bore (10) with rams (13,14) reciprocal within the chambers (11,12), a rod (15,16) connected to each of the rams (13,14) for moing the rams (13,14) and extending longitudinally within each of the chambers (11,12) and means for supporting the rods (15,16) for reciprocation within their respective chambers (11,12) in which the rods (15,16) are offset relative to the longitudinal axis of the chambers (11,12). The rams (13,14) are reciprocable between a first position for opening the bore (10) and a second position for closing the bore (10) dividing the bore (10) into zones (Z,Z1) above and below the rams (13,14). In a particular embodiment a passage (13a min ,14a min ) is provided in at least one of the rams (13,14) extending between the zone (Z) above the rams (13,14) and the chamber (11,12) adjacent the end of the rod (15,16) connected to the ram (13,14) while a valve (CV) supported adjacent the end of the rod (15,16) for longitudinal movement relative to the ram (13,14) ensures that the end (13c,14c) of the passage (13a min ,14a min ) that communicates with the chamber (11,12) adjacent the end of the rod (15,16) may be closed off.</p> |
