Shaft seal for corrosion resistant butterfly valve

Details Shaft seal for corrosion resistant butterfly valve Shaft seal for corrosion resistant butterfly valve

1975-02-26

1976-07-06

Schwadron, Martin P.

Valves and valve actuation

Mechanical movement actuator

Particularly packed or sealed

251306, 277205, F16K 3144

Patent

active

039678121

ABSTRACT:
A valve, such as a butterfly valve, having an offset closure vane supported on stub shafts for operating the vane in the flow passage of the body, has all exposed and/or potentially vulnerable metal surfaces encapsulated in a corrosion resistant polymeric plastic coating. Annular seals of resilient composition bonded to a steel insert are formed with an annular radial recess at an axially intermediate location and are positioned on the vane shafts axially squeezed between vane and body bosses thereat. In this arrangement, controlled deflection is provided by the seals in effecting a positive sealing pressure whereby the shafts are protected against exposure to line content. At the same time, the seals are rendered self-packing in response to pressure of line content while also functioning to assure concentric centering of the vane in the body passage.

REFERENCES:
patent: 2983533 (1961-05-01), Tisch
patent: 3329398 (1967-07-01), Goldsmith
patent: 3425439 (1969-02-01), Duffey et al.
patent: 3469855 (1969-09-01), Enting
patent: 3517689 (1970-06-01), Roos
patent: 3656712 (1972-04-01), Bertrem
patent: 3750698 (1973-08-01), Walchle et al.
patent: 3771763 (1973-11-01), Myers
patent: 3776509 (1973-12-01), Leblond

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