| 摘要 |
<p>A ball valve device for subsea applications, particularly intended to be connected into subsea pipeline systems which lead a flowing medium (gas and/or oil) in subsea condition, capable of being dismantled for inspection and maintenance. The ball arrangement of the valve consists of an upper ball member (3), and a lower ball member (4) the upper ball member (3) includes the main packings of the valve, while the lower ball member (4) includes two axially withdrawable sleeves (13). When the valve is open the sleeves (13) can be withdrawn outwards for intervention with guides in the valve housing (1) and thereby form a tight continuous passageway which extends from one of the openings in the valve housing (1) to the second opening in the valve housing (1). The axial withdrawable sleeves (13) can be moved inwards to a position where they are free from its other guides to allow the ball arrangement to rotate during closing of the valve.</p> |
