| 摘要 |
The invention concerns a sealing device (10) comprising a sealed valve cage (22) and a sealing seat (24) provided with a passage orifice (26). A mobile valve (28) is provided with a sealing peripheral surface (30) which co-operates, in a closing position, with the sealing seat (24) to define a sealing position. An actuating arm (32) supports the valve (28). A driving mechanism (34) is designed to activate the actuating arm (32) and move the valve (28) between the closing position and an opening position, wherein the valve (28) completely clears the passage orifice (26). A ball-joint (36) is located sealed and rotating in a housing (38) of the outer wall (40) of the valve cage (22). The actuating arm (32) tightly passes through the ball-joint (36) outside the valve cage (22), where it is connected to the driving mechanism.
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