| 摘要 |
Blow-out preventer, especially for use in drilling bore hole sections close to the sea bed and designed to prevent the blow-out of natural gas in the bore hole. It comprises at least one annular, especially expandable and contractible packing element 59, 59', which is designed, in the event of radial expansion to bear tightly against the circumferential space of the bore hole. The blow-out preventer comprises an inner pipe element 1, with limited capacity for telescopic displacement in relation to the outer casing 8 of the blow-out preventer, which pipe element is spring loaded 9 towards the extended telescopic position when it is not subjected to additional weight loading, and elements which are designed, in the relative contracted telescopic position of the pipe element 1 and the outer casing 8, to seal off the passage through the inner cavity 48 of the blow-out preventer and to maintain a fluid connection to the packing element/the packing elements 59, 59' for inflating this/these elements. <IMAGE>
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