Enhanced sealing arrangement for a rotary valve shaft

Details Enhanced sealing arrangement for a rotary valve shaft Enhanced sealing arrangement for a rotary valve shaft

1992-11-06

1994-07-05

Walton, George L.

Valves and valve actuation

Mechanical movement actuator

Particularly packed or sealed

251312, 2513351, 277106, 277124, F16K 4104, F16K 4108

Patent

active

053260740

ABSTRACT:
A valve has an actuating shaft packing assembly for located in a valve enclosure cover for preventing leakage of process fluid into the space between the actuating shaft and the cylindrical sidewall of a bore in the cover. The assembly includes an annular lip located at the axial end of the bore proximal to the fluid control member. The lip extends axially away from the fluid control member. An annular sealing ring is positioned between the lip and the cylindrical sidewall of the bore and formed of a material having a greater coefficient of thermal expansion than the valve body or actuating shaft. The annular ring shrinks when cooled and increases the sealing effectiveness between the sealing ring and the lip for enhanced suppression of fluid flow between the sealing assembly and the cylindrical sidewall.

REFERENCES:
patent: 2441705 (1948-05-01), Jacobsen
patent: 3521856 (1970-07-01), Smith
patent: 4234197 (1980-11-01), Amancharla
patent: 4475712 (1984-10-01), DeJager
patent: 4512586 (1985-04-01), Smith
patent: 4531537 (1985-07-01), Smith
patent: 4886241 (1989-12-01), Davis et al.
patent: 4930748 (1990-06-01), Gonsior
patent: 5024453 (1991-06-01), Suggs
patent: 5129625 (1992-07-01), Wood et al.
patent: 5131666 (1992-07-01), Hutchens

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