Patent ID: 6315297
Filing Date: 2001-11-13
Classification: F04D,F16J

Abstract:
A seal includinga housing having two axially-spaced stationary sealing surfaces,a shaft assembly rotatable in the housing,a sealing assembly mounted on the shaft assembly and rotatable therewith, the sealing assembly having two moveable sealing surfaces, each operatively biased against a respective one of the stationary sealing surfaces to seal therebetween, and a spacer member located between the two moveable sealing surfaces, the two moveable sealing surfaces being located on respective heads which rotate with the spacer member but are biased axially away from the spacer member towards their respective stationary sealing surfaces,the spacer member being locked rotationally to the shaft assembly by a keylock arrangement which permits relative axial movement between the spacer and the shaft assembly,wherein the shaft assembly is moveable axially relative to the sealing assembly, so that the seal between the stationary sealing surface and the moveable sealing surface is maintained even when the shaft is moved axially.