Seals for a gas service butterfly valve

Details Seals for a gas service butterfly valve Seals for a gas service butterfly valve

1975-04-07

1976-10-26

Schwadron, Martin P.

Valves and valve actuation

Mechanical movement actuator

Particularly packed or sealed

251305, 277103, F16K 3144, F16K 122

Patent

active

039880001

ABSTRACT:
A mechanically packed gasket is supported circularly concentric on the operator shaft of a butterfly valve in a wedged interfit with an inwardly chamfered end of the shaft journal. With gasket pressure of magnitudes greater than line pressure, leakage of gas from the valve passage past the actuator is prevented. At the same time, gasket pressure against the operator shaft prevents leakage to atmosphere of any gas content inadvertently obtaining access to the shaft surface either by leakage into the vane cavity through porosity of the vane or through functional failure of other shaft seals. Located outward of the shaft journal in a leakage path parallel to that of the gasket is a lubricant packing construction enabling in-service maintenance to be performed against the journal in the event line content leakage should be encountered there.

REFERENCES:
patent: 2306219 (1942-12-01), McMangus
patent: 3076658 (1963-02-01), LeMan
patent: 3091470 (1963-05-01), Anderson et al.
patent: 3190702 (1965-06-01), Flick
patent: 3384382 (1968-05-01), Rink
patent: 3471121 (1969-10-01), Geiselman
patent: 3525499 (1970-08-01), Geiselman et al.

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