Shaft seal for butterfly valve

Details Shaft seal for butterfly valve Shaft seal for butterfly valve

1993-07-26

1994-03-22

Fox, John C.

Valves and valve actuation

With means to increase head and seat contact pressure

Seat pressed to valve

251306, F16K 122

Patent

active

052956598

ABSTRACT:
The present invention comprises an improved two-way dynamic shaft-sealing member for a fluid transport system having a butterfly valve with an inflatable seal with the improved shaft-sealing member including a rigid race secured to and carried by the interface portion of the inflatable seal to maintain the integrity of the interface portion of the seal with a compressible sealing ring located in the race and held in confinement by the race to hold the sealing ring in a sealing condition against the inside of the race and the outside of the shaft to prevent fluids from escaping therepast as the shaft is moved or the inflatable seal is inflated or deflated.

REFERENCES:
patent: 3173650 (1965-03-01), Lotterman et al.
patent: 3306316 (1967-02-01), Stillwagon
patent: 4014511 (1977-03-01), Uno
patent: 4176675 (1979-12-01), Liberman
patent: 4396199 (1983-08-01), Boyd
patent: 4703937 (1987-11-01), Chrzanowski
patent: 4706970 (1987-11-01), Ramirez
patent: 4836499 (1989-06-01), Steele
patent: 4886241 (1989-12-01), Davis
patent: 5056758 (1991-10-01), Bramblet
patent: 5071318 (1991-12-01), Bice
patent: 5178180 (1993-01-01), Parris

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