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Time to install
Replacing the thrust balance valve with the new thrust balance orifice system can eliminate the maintenance and oil leaks from the TBV, and can reduce trips related to TBV software. New software is installed for monitoring thrust balance cavity pressure and annunciates an alarm, if required.
The orifice plate is used to passively control pressure in the piston cavity to regulate the axial position of the low-pressure rotor system and the loading of the No. 1 bearing.