Shaft sealing device for a butterfly valve

Details Shaft sealing device for a butterfly valve Shaft sealing device for a butterfly valve

1975-03-18

1976-09-07

Schwadron, Martin P.

Valves and valve actuation

Mechanical movement actuator

Particularly packed or sealed

277 61, 277 74, F16K 3144

Patent

active

039791041

ABSTRACT:
A shaft seal device for a butterfly valve shaft wherein a friction face seal device having a flexible double bellows arrangement thereon is disposed within a seal chamber between a contaminated source of pressurized steam and a low pressure gland condenser. A buffer layer of uncontaminated steam having a pressure higher than the pressure of the contaminated steam is introduced into the seal chamber through conduit means. The buffer layer of uncontaminated steam having a pressure higher than the pressure of the contaminated steam is disposed between the contaminated steam source and the gland condenser to insure zero leakage of contaminated steam past the double bellows seal device into the gland condenser.

REFERENCES:
patent: 1826212 (1931-10-01), Gremminger
patent: 2467960 (1949-04-01), Brady, Jr.
patent: 3604206 (1971-09-01), Baily
patent: 3642024 (1972-02-01), LaCoste et al.
patent: 3740057 (1973-06-01), Doyle et al.

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