Ultra high vacuum seal arrangement

Details Ultra high vacuum seal arrangement Ultra high vacuum seal arrangement

1978-03-30

1981-08-11

Callaghan, Thomas F.

Pipe joints or couplings

Temperature responsive joint element; e.g., shrunk fit

Memory plastic element

2853822, 285397, 285417, 285422, F16L 1314

Patent

active

042830796

ABSTRACT:
Arrangement for demountably sealing two concentric metallic tubes in an ultra high vacuum system which facilitates remote actuation. A tubular seal includes integral spaced lips which circumferentially engage the metallic tubes. The lips plastically deform the metallic tubes by mechanical forces resulting from a martensite to austenite transformation of the tubular seal upon application of a predetermined temperature. The sealing force is released upon application of another temperature which causes a transformation from the stronger austenite to the weaker martensite. Use of a dual acting sealing ring and driving ring circumferentially contacting the sealing ring is particularly applicable to sealing larger diameter concentric metallic members.

REFERENCES:
patent: 3174851 (1965-03-01), Buehler
patent: 3513429 (1970-05-01), Helsop
patent: 3579805 (1971-05-01), Kast
patent: 3740839 (1973-06-01), Otte et al.
patent: 3759552 (1973-09-01), Levinsohn et al.
patent: 3805567 (1974-04-01), Agius-Sinerco
patent: 3872573 (1975-03-01), Nichols et al.
patent: 3893718 (1975-07-01), Powell
patent: 3913444 (1975-10-01), Otte
patent: 4035007 (1977-07-01), Harrison et al.
patent: 4135743 (1979-01-01), Hughes

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