#$%^&*AU2010200828B220150205.pdf#####PRESSURE BALANCED SHAFT SEAL ASSEMBLY Abstract s A pressure balanced shaft seal assembly (40) that allows a seal to dynamically respond to angular or radial misalignment of a shaft (1) is disclosed. The pressure balanced shaft seal assembly (40) includes a fixed stator (2), a floating stator (4), and a labyrinth seal (3). In one embodiment, the floating stator (4) and labyrinth seal (3) are mounted within an annular groove (48) formed in the fixed stator (2) such that the io floating stator (4) and labyrinth seal (3) may move a predetermined amount in the radial direction with respect to the fixed stator (2). A spherical interface (11) between the labyrinth seal (3) and floating stator (4) may allow the labyrinth seal (3) to pivot with respect to the floating stator (4) during angular misalignment of a shaft (1) around which the pressure balanced shaft seal assembly (40) is mounted. A pressure balancing annular 15 channel (46) formed in the floating stator (4) allows pressurized seal fluid to balance the axial pressure exerted on the floating stator (4) by the process fluid.2/1 5 J2J481 2 FI5 3
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