Seal for a joint or juncture – Seal between relatively movable parts – Relatively rotatable radially extending sealing face member
Patent
1997-10-03
1999-07-20
Reichard, Lynne A.
Seal for a joint or juncture
Seal between relatively movable parts
Relatively rotatable radially extending sealing face member
277361, 277389, F16J 1534
Patent
active
059246979
ABSTRACT:
An improved gas seal having inboard and outboard seal units each defined by a pair of opposed and relatively rotatable seal faces, one face of each pair having appropriate grooves which communicate with a pressurized barrier gas, preferably an inert gas such as nitrogen. The inboard seal unit, at its other seal periphery, communicates with a process fluid being handled by a rotating equipment, namely a pump. Each seal unit has one of the seal rings, the nonrotating ring in the preferred embodiment, urged axially toward its opposed ring by a compact bellows which axially cooperates between the respective seal ring and a backing member. The bellows is positioned to create an isolation between the barrier and process fluids and to provide an effective diameter to provide desirable balance of pressures as imposed on the axially moving seal ring to optimize seal performance. The bellows at one end is connected to a support ring which is urged toward the adjacent seal ring with an annular gasket maintaining a soft sealed contact therebetween. The other end of the bellows is connected to a pressure piston which seats against a stationary gland. The process fluid urges the pressure piston into contact with the support ring to increase the sealing pressure at the gasket in the event of an improper balance between the pressures of the barrier and process fluids.
REFERENCES:
patent: 2420556 (1947-05-01), Mueller
patent: 3079605 (1963-02-01), Thomas et al.
patent: 3333856 (1967-08-01), Voitik
patent: 3372076 (1968-03-01), Wilkinson
patent: 3475033 (1969-10-01), Voitik
patent: 3575424 (1971-04-01), Taschenberg
patent: 3805882 (1974-04-01), Vallance
patent: 3880434 (1975-04-01), Echard et al.
patent: 3988026 (1976-10-01), Kemp, Jr.
patent: 4013297 (1977-03-01), Smith
patent: 4071253 (1978-01-01), Heinen et al.
patent: 4123069 (1978-10-01), Sato
patent: 4136887 (1979-01-01), Wentworth, Jr.
patent: 4183541 (1980-01-01), Wentworth, Jr.
patent: 4365816 (1982-12-01), Johnson et al.
patent: 4721311 (1988-01-01), Kakabaker
patent: 4749200 (1988-06-01), Sehnal et al.
patent: 5149249 (1992-09-01), Schellong et al.
patent: 5490679 (1996-02-01), Borrino et al.
patent: 5496047 (1996-03-01), Goldswain et al.
patent: 5544897 (1996-08-01), Di Pietro et al.
"A New Shaft Sealing Solution for Small Cryogenic Pumps", C.P. Morrissey, John Crane EAA, United Kingdom, Feb. 5, 1996 as previously-submitted (5 pages).
EG&G Sealol Industrial Division, "Non-Contacting Welded Metal Bellows Seal for Process Equipment" Type 1010 brochure, Dec. 1996, (6 pages).
Enlargement of Type 1010 gas seal, from p. 5 of EG&G Sealol Industrial Division, "Non-Contacting Welded Metal Bellows Seal for Process Equipment" Type 1010 brochure, Dec. 1996.
Adams William V.
McCowey Christopher D.
Parker Joseph C.
Binda Greg
Durametallic Corporation
Reichard Lynne A.
LandOfFree
Double gas seal with bellows supported by backing and support ri does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Double gas seal with bellows supported by backing and support ri, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Double gas seal with bellows supported by backing and support ri will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-1315493