Seal for a joint or juncture – Seal between relatively movable parts – Relatively rotatable radially extending sealing face member
Reexamination Certificate
2007-11-27
2007-11-27
Pickard, Alison K (Department: 3673)
Seal for a joint or juncture
Seal between relatively movable parts
Relatively rotatable radially extending sealing face member
C277S365000
Reexamination Certificate
active
11109600
ABSTRACT:
A staged seal assembly having a plurality of staged seals and an external pressure breakdown device connected to the seal assembly and configured to be connected to an external device, wherein each staged seal includes a shaft seal and a seal bypass. The seal bypass includes a pressure breakdown device and directs a portion of fluid through the pressure breakdown device bypassing the respective shaft seal. The staged seal assembly may be configured to be installed in a new installation or replace an existing, seal assembly while substantially maintaining equal pressure reductions across each staged seal and substantially matching the fluid parameters of an external device originally connected to the seal assembly being replaced.
REFERENCES:
patent: 3227463 (1966-01-01), Wiese
patent: 3334905 (1967-08-01), Horwitz et al.
patent: 3360272 (1967-12-01), Blom et al.
patent: 3459430 (1969-08-01), Ball
patent: 3628799 (1971-12-01), Wiese et al.
patent: 3813103 (1974-05-01), Wiese
patent: 3858890 (1975-01-01), Wiese
patent: 4272084 (1981-06-01), Martinson et al.
patent: 4838559 (1989-06-01), Guardiani et al.
patent: 4848774 (1989-07-01), Nyilas et al.
patent: 5865418 (1999-02-01), Nakayama et al.
patent: 6446976 (2002-09-01), Key et al.
patent: 6811155 (2004-11-01), Takahashi
patent: 7014192 (2006-03-01), Takahashi et al.
patent: 2004/0129315 (2004-07-01), Dario et al.
patent: 2004/0226613 (2004-11-01), Ono
patent: 20 30 133 (1971-12-01), None
patent: 0 426 041 (1991-05-01), None
patent: 0 446 531 (1991-09-01), None
patent: 59 080568 (1984-08-01), None
Wavy Face Upgrade; N-7500 Nuclear Mechanical Seal; Apr. 2003; pp. 1-4; Flowserve Corporation; USA.
Nuclear Power; Mar. 2003; pp. 1-20; Flowserve Corporation; USA.
EPRI Licensed Material; MCP Seal Maintenance Guide; pp. 1-63.
J.A. Marsi; Development of a 9 Inch (228 mm) Nuclear Primary Coolant Seal; ASME-STLE Tribology Conference; Baltimore, MD; Oct. 16-19, 1988.
J.A. Marsi; Station Blackout Test on a Reactor Coolant Pump Mechanical Seal; Byron Jackson Products; BW/IP International, Inc.; Los Angeles, CA.
Flowserve Management Company
Pickard Alison K
LandOfFree
Seal staging system does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Seal staging system, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Seal staging system will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-3866157