Ball stem seal

Valves and valve actuation – Mechanical movement actuator – Particularly packed or sealed

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Details

277514, 277530, 137312, F16K 4104, F16K 4108

Patent

active

061293369

ABSTRACT:
A stem seal assembly comprises a stem having a top end and a bottom end. The stem is adapted to fit in a valve body and interface with the valving member. A ball segment integral to the stem has a top surface facing upwardly and a bottom surface facing downwardly. A first seal engages the top surface of the ball segment and the second seal engages the bottom surface of the ball segment.

REFERENCES:
patent: 945433 (1910-01-01), Allen
patent: 3043324 (1962-07-01), Morgan
patent: 3186681 (1965-06-01), Lowrey
patent: 3425663 (1969-02-01), Priese
patent: 3443816 (1969-05-01), Saleri et al.
patent: 4317573 (1982-03-01), Karkkainen
patent: 5263682 (1993-11-01), Covert et al.
patent: 5326074 (1994-07-01), Spock, Jr. et al.
patent: 5375812 (1994-12-01), Kent
patent: 5407176 (1995-04-01), Nevrekar
Brochure from Pfannenschmidt GmbH Kugelhahne, KK-8-91.
German Patent Application entitled "Schaltwellendichtung", Nov. 1, 1996.

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