Apparatus and methods for removing and installing a selected...

Rotary kinetic fluid motors or pumps – Working fluid passage or distributing means associated with... – Plural distributing means immediately upstream of runner

Reexamination Certificate

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C415S191000, C415S209200, C415S209300

Reexamination Certificate

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07094025

ABSTRACT:
Nozzle segments are secured to a retention ring against circumferential rotation by anti-rotation pins extending generally axially between the outer bands of the nozzle segments and the retention ring. Retention plate segments overlie the ends of the pins, preventing axial removal thereof. To remove a selected nozzle segment, inner diameter retention plate segments and selected retention plate segments are removed, the latter exposing the ends of the pins for axial withdrawal. Upon removal of a predetermined number of pins, the nozzle segments adjacent the selected segment are displaced away from the latter segment to open a gap between the selected segment and adjacent segments whereby the selected segment can be removed in an axial direction.

REFERENCES:
patent: 3423071 (1969-01-01), Noren
patent: 4274805 (1981-06-01), Holmes
patent: 4815933 (1989-03-01), Hansel et al.
patent: 4883405 (1989-11-01), Walker
patent: 5141394 (1992-08-01), Donlan
patent: 5211536 (1993-05-01), Ackerman et al.
patent: 5224822 (1993-07-01), Lenahan et al.
patent: 5459995 (1995-10-01), Norton et al.
patent: 5591003 (1997-01-01), Boyd et al.
patent: 5618161 (1997-04-01), Papageorgiou et al.

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