Seal for a joint or juncture – Seal between relatively movable parts – Relatively rotatable radially extending sealing face member
Patent
1992-09-18
1994-12-27
DePumpo, Daniel G.
Seal for a joint or juncture
Seal between relatively movable parts
Relatively rotatable radially extending sealing face member
277 81R, 277 961, F16J 1516
Patent
active
053758536
ABSTRACT:
A double, back to back oriented mechanical end face seal for use in sealing toxic or corrosive fluids having an intermediate buffer fluid chamber into which a relatively inert gas, such as nitrogen, is provided for use as a buffer fluid. The nitrogen gas is maintained at a pressure which exceeds the process fluid pressure by at least 10 p.s.i. and, in a preferred embodiment, spiral pumping grooves in the mating rings of each of the seals are shaped and dimensioned to pump the nitrogen buffer gas through the first seal from the intermediate chamber into the process fluid chamber and through the second seal from the intermediate chamber into the environment external to the housing and sealing area, thereby avoiding the escape of the process fluid into the intermediate buffer chamber and to the atmosphere. Contamination of the process fluid by the buffer gas may be tolerated. The buffer gas may be any relatively inert gas, a gas which is non-hazardous to the environment and also is compatible with the process fluid used; appropriate examples are nitrogen, carbon dioxide, air or one of the noble gases. The seal can be used to seal a process fluid which is either a liquid or a gas.
REFERENCES:
patent: 2853020 (1958-09-01), Hollinger et al.
patent: 3527465 (1970-09-01), Guinard
patent: 3572727 (1971-03-01), Greiner
patent: 3743302 (1973-07-01), Bach et al.
patent: 3767212 (1973-10-01), Ludwig
patent: 3894741 (1975-07-01), McHugh
patent: 4212475 (1980-07-01), Sedy
patent: 4290611 (1981-09-01), Sedy
patent: 4377290 (1983-03-01), Netzel
patent: 4792146 (1988-12-01), Lebeck et al.
patent: 5058905 (1991-10-01), Nosowicz et al.
patent: 5249812 (1993-10-01), Volden et al.
Netzel James P.
Volden Douglas J.
Wasser James R.
DePumpo Daniel G.
John Crane Inc.
LandOfFree
Secondary containment seal does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Secondary containment seal, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Secondary containment seal will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-913869