Valve with metallic bellows valve stem seal

Details Valve with metallic bellows valve stem seal Valve with metallic bellows valve stem seal

1990-01-16

1990-12-11

Walton, George L.

Valves and valve actuation

Mechanical movement actuator

Particularly packed or sealed

74104, 74109, 744248VA, 251 58, 25112901, 251250, 251266, 251315, 2513353, 277200, F16K 3150, F16K 31528, F16K 3154, F16K 4110

Patent

active

049764039

ABSTRACT:
A fire-resistant valve 10 with a valve stem 40 mounted for linear motion through a valve stem bore 41 in the valve body 12 and connected to a valve element 20 by a connection means which effects movement of the valve element 20 between its valve open and its valve closed positions in response to axial linear motion of the valve stem 40. The valve includes a valve stem actuator 46 and a valve stem seal assembly comprising a primary seal in the form of an axially extensible and compressible metallic bellows 50 disposed in sleeved relation to the valve stem 40. The bellows is connected at one end by an annular weld 41 to the valve stem and at its other end by an annular weld 52 to the valve body in encircling relation to the valve stem and valve stem bore so as to effect a fluid-tight, gas-tight seal therebetween. A packing structure mounted in the annulus between the valve stem and wall of the valve stem bore provides a secondary valve stem seal.

REFERENCES:
patent: 1644825 (1927-10-01), Fulton
patent: 3096966 (1963-07-01), McFarland, Jr.
patent: 3184214 (1965-05-01), King
patent: 3532320 (1970-10-01), Fisch
patent: 3787023 (1974-01-01), Shufflebarger
patent: 4231545 (1980-11-01), Nelimarkka
patent: 4399977 (1983-08-01), Wheatley
patent: 4634094 (1987-01-01), Geiser
patent: 4763874 (1988-08-01), Ogawa

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