High temperature high pressure seal stack having run-dry...

Details High temperature high pressure seal stack having run-dry... High temperature high pressure seal stack having run-dry...

2005-03-18

2009-12-29

Gay, Jennifer H (Department: 3676)

Seal for a joint or juncture

Seal between relatively movable parts

Circumferential contact seal for other than piston

C277S500000, C277S511000, C277S603000

Reexamination Certificate

active

07637508

ABSTRACT:
A long life high pressure seal stack provides a reliable and efficient seal between a plunger and housing of a plunger type pump. The seal stack includes a high pressure sealing element and a low pressure sealing element, both of which provide a sealing extension which surrounds and is in contact with the plunger. The sealing extension is configured to be exposed to internal pressures within the valve, thus urging the sealing extension tighter against the plunger when pressures are high, while relaxing the sealing extension when pressures are low. By incorporating this variable pressure feature, the friction between the plunger and the seal is greatly reduced, especially during low pressure conditions. Further, the sealing elements are constructed of a low friction material, thus avoiding problems related to potential overheating of a seal element. Through the design of the sealing structure, and the selection of appropriate materials, a seal stack is created which has longer live and has dry run capabilities.

REFERENCES:
patent: 2443332 (1948-06-01), Summers
patent: 3866924 (1975-02-01), French
patent: 3870439 (1975-03-01), Stachowiak et al.
patent: 4106779 (1978-08-01), Zabcik
patent: 4652000 (1987-03-01), O'Rourke
patent: 5306021 (1994-04-01), Morvant
patent: 5738358 (1998-04-01), Kalsi et al.
patent: 5755372 (1998-05-01), Cimbura, Sr.
patent: 2003/0214100 (2003-11-01), Pippert

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