Expansion joint with low friction packed seal

Details Expansion joint with low friction packed seal Expansion joint with low friction packed seal

1993-08-02

1994-04-19

Arola, Dave W.

Pipe joints or couplings

With indicator, alarm or inspection means

285301, 285337, 285422, 285910, F16L 3500

Patent

active

053039602

ABSTRACT:
This invention provides an expansion joint that uses a flexible sealing element in conjunction with a packed seal in a manner that allows a reduction in break-away forces and permits continued operation of the joint after a failure of the bellows or bellows attachment point. The expansion arrangement includes a flexible sealing element, usually in form of a bellows, and a containment chamber in communication with the exterior portion of the flexible sealing element or bellows and an interior portion of the packed seal. The containment chamber has an opening that permits relative movement between the ends of the expansion joint and is sealed by the packed seal. In the event of a bellows failure, the packing material acts to restrict or prevent leakage from the containment chamber to the outside environment. The packed seal is made of a combination of materials that provide packing friction coefficient of less than 200 lbs/in.

REFERENCES:
patent: 982836 (1911-01-01), Ley et al.
patent: 1873703 (1932-08-01), Giesler
patent: 1968715 (1934-07-01), Slade
patent: 2044430 (1936-06-01), Hall
patent: 3053554 (1962-09-01), Magos et al.
patent: 3232640 (1966-02-01), Donkle
patent: 4046407 (1977-09-01), Porreco
patent: 4448449 (1984-05-01), Halling et al.
patent: 4511162 (1985-04-01), Broyles
patent: 4679828 (1987-07-01), Bernardot

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