| 摘要 |
A shaft seal for sealing around a rotary shaft where said shaft extends through an aperture, said shaft seal comprising: a first rotatable sealing member having a first face, which first rotatable sealing member is adapted to be mounted on a rotary shaft for rotation therewith; a second non-rotatable sealing member having a second face, which second non-rotatable sealing member can be secured in or adjacent an aperture through which the shaft extends, such that said second non-rotatable sealing member encircles said shaft for closing said aperture and said second face opposes said first face, at least one of said first and second faces being movable into and out of contact with the other of said faces; biasing means active on said at least one of said first and second sealing members, for urging said at least one face into contact with the other of said faces for sealing the aperture; and fluid input means adapted to be connected to a pressurised supply of sealing and/or sterilization fluid, for inputting fluid between said first and second faces, for urging said first and second faces apart to provide a small clearance therebetween, which clearance is flushed by said fluid thereby preventing substantial egress of material through the seal. <IMAGE> |
