Around the shaft union

Abstract

A fluid coupling device has rotating seal is adapted to be mounted on a rotating device and a stationary seal is adapted to be mounted on a stationary device. The stationary seal is at least partially positioned adjacent a side of the rotating device parallel to its axis of rotation. The stationary seal is operable to move between a closed position where it engages with the rotating seal and an open position where it disengages from the rotating seal. A media inlet is adapted to provide a media to the rotor at an area adjacent the rotating seal and the stationary seal. A biasing member provides a balance ratio between the rotating seal and the stationary seal, such that when no media or a compressible media is directed through the media inlet a net opening force maintains the stationary seal in the open position, and when a non-compressible media is directed through the media inlet a net closing force maintains the stationary seal in the closed position.