Ball valve for cryogenic service

Details Ball valve for cryogenic service Ball valve for cryogenic service

F - Mech Eng,Light,Heat,Weapons

16

K

251/49

F16K 5/06 (2006.01) F16K 5/08 (2006.01)

Patent

CA 1251770

IMPROVEMENTS IN OR RELATING TO VALVES ABSTRACT A valve seal (8,9) particularly suitable for cryogenic service comprises a hollow generally cylindrical member fabricated from a material which under cryogenic service conditions is flexible but substantially incompressible. Spaced annular grooves (17,19) are formed on the inner wall of the member and a further groove 18 is formed on the outer wall between grooves 17,19. The opposed grooves 17, 19 and 18 overlap slightly to form a "concertina" like wall cross section. A tapered seating surface 13,14 is provided to engage the outer surface of a valve ball 7. In service, annular grooves 17,19 and 18 provide a degree of resilience in a material otherwise incompressible under service conditions.

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