| 摘要 |
PROBLEM TO BE SOLVED: To provide a device having new efficient sealing.SOLUTION: The device includes sealing having a plurality of sealing elements (2'''') disposed around a central opening in a substantially ring-shaped configuration, to obtain efficient sealing. Each sealing element comprises a sealing face opposed to the central opening. At least one chamber (13'''') is included to receive a part of the sealing elements (2''''). An inlet to a fluid supply source supplies a fluid to the at least one chamber (13'''') to generate excessive pressure that acts on the part of the sealing element received in the at least one chamber (13'''') and moves the sealing face of the sealing element to the central opening. |
