Sealing ring

Details Sealing ring Sealing ring

1978-07-26

1980-03-25

Smith, Robert I.

Seal for a joint or juncture

Seal between relatively movable parts

Relatively rotatable radially extending sealing face member

2771675, 251306, F16J 1532

Patent

active

041947495

ABSTRACT:
A double toric sealing ring for providing a seal between a casing and a butterfly member of a butterfly valve is formed with two helical springs each forming a torus and disposed concentrically. The helical spring forming the outer torus has a coil diameter greater than that of the coils of the spring forming the inner torus. Each spring is enclosed by a respective sheath. A metal annulus extending between the tori has its radially inner and outer peripheries bent around the respective sheathed tori. The radially extending portion of the annulus between these bent parts is formed with a bellows like groove concentric with the tori, to permit deformation of the sealing ring which in use is mounted in the butterfly valve so that the smaller diameter encased torus provides a seal between relatively stationary parts and the larger diameter encased torus provides a seal between the casing and the movable butterfly member when the latter is closed.

REFERENCES:
patent: 3031213 (1962-04-01), Bruning et al.
patent: 3053543 (1962-09-01), Kallin
patent: 3356336 (1967-12-01), Maenaka
patent: 3879043 (1975-04-01), Tozer
patent: 3905577 (1975-09-01), Karpenko
patent: 3917294 (1975-11-01), Abbes
patent: 4132399 (1979-01-01), Lelhanu

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