Seal for a joint or juncture – Seal between relatively movable parts – Relatively rotatable radially extending sealing face member
Patent
1994-02-14
1996-06-25
DePumpo, Daniel G.
Seal for a joint or juncture
Seal between relatively movable parts
Relatively rotatable radially extending sealing face member
277 3, 277 961, F16J 1538
Patent
active
055293158
ABSTRACT:
A three-part seal comprising an inboard, an intermediate and an outboard seal and defining two chambers, a mixing chamber between the inboard seal and the intermediate seal and a buffer chamber between the intermediate seal and the outboard seal, provides the capability of zero emissions of a process fluid under pressure in a housing. The process fluid may comprise a toxic or otherwise environmentally hazardous process fluid. A radial bore provides fluid communication between the buffer chamber and a buffer fluid reservoir, for example, a source of nitrogen gas, which is maintained at a pressure, preferably about five to eight psi, over the fluid pressure in the mixing chamber. Spiral grooves on at least one ring of the intermediate seal pump the buffer fluid from the buffer chamber into the mixing chamber where it mixes with any leakage of the process fluid and is evacuated through a second radial bore which provides fluid communication between the mixing chamber and a collection pod for collecting and processing the mixed fluid. A method of providing a zero emission seal between a housing and a relatively rotating shaft is also disclosed.
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Borrino Thomas
Kozlowski Daniel N.
Kruszynski Michaeline G.
Watanuki Gary G.
DePumpo Daniel G.
John Crane Inc.
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