US Patent:
20080067754, Mar 20, 2008
Inventors:
John Schroeder - Orange CA, US
William Brustad - Perris CA, US
Sanford Damasco - Irvine CA, US
Jack Bunn - Houma LA, US
International Classification:
F16J 15/50
Abstract:
A pressure gradient rotary sealing system is described with an additional configuration which uses and externally mounted pressure-reducing piston with a differential area to create a pressure differential across the system to reduce the pressure×velocity (PV) value to extend seal system life and provide early indication of impending seal failure. This invention is another embodiment of this previous invention offering using a separate externally mounted pressure reducing piston therefore the main body of the wash-pipe top-nut is lighter weight, the system has more fluid capacity, is simpler to assemble, operate and monitor and has a longer service life than previous configurations.