Pipe joints or couplings – Particular interface – Tapered
Patent
1994-09-08
1995-11-14
Arola, Dave W.
Pipe joints or couplings
Particular interface
Tapered
285336, 285363, 285917, 277225, 277236, F16L 2500
Patent
active
054660181
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
The present invention relates to a seal ring and connection joint for conduits, pressure vessels or the like.
When connecting adjacent sections of fluid flow conduits or vessels, seal rings are typically interposed at the interface of adjacent connecting ranged conduit or vessel portions which are then bolted together. Where high pressure or corrosive fluid is carried in the conduit or vessel, the seal ring used is typically metallic, the seal being effected by elastic or plastic deformation of a sealing surface of the seal ring against sealing portions of the ranged portions.
Known seal rings and joints of the general type are disclosed, for example in U.K. patent specifications 742213, 854189, 952755, 1035958 and 1521546, and PCT specification WO91/19128.
SUMMARY OF THE INVENTION
We have now devised an improved seal ring and associated connection joint.
According to a first aspect of the invention, there is provided an annular seal ring comprising an integrally formed sealing portion, spigot portion and interconnecting web portion, said sealing portion comprising a pair of annular seal lips facing the spigot portion and extending in a transverse direction to said web portion, which web portion extends radially outwardly from said pair of seal lips to said spigot portion, which spigot portion is provided with spigot projections projecting in mutually opposed directions transversely to the web portion, wherein the thickness of said spigot portion in the radial direction is substantially greater than the thickness of the web portion in the transverse direction, and each respective seal lip is arranged to project transversely from said web portion by a distance which is substantially greater than the thickness of said web portion in said transverse direction.
It is preferred that the thickness of the spigot portion in the radial direction is substantially greater than the thickness of the web in the transverse direction over substantially the whole transverse extent of the spigot portion.
The pair of annular seal lips are preferably arranged each on a respective radially outer portion of the sealing portion, and advantageously slope radially outwardly and toward one another to the web portion.
It is preferred that each spigot projection is provided with a respective first transverse face portion facing a respective seal lip, which transverse face portion is advantageously disposed substantially perpendicular to the radial direction.
Typically, each spigot projection is provided with a respective second transverse face portion spaced from the respective first transverse face portion and facing in an opposed direction thereto. Advantageously, the first and second transverse face portions provided on each spigot projection are substantially parallel to one another.
Typically, the second transverse faces comprise the radially outermost extent of the seal ring. Advantageously the second transverse faces are coplanar thereby defining a substantially continuous annular radially outer surface of the seal ring.
It is preferred that the respective spigot projections are provided in the region of their transversely projecting limits with respective tapered or chamfered portions.
Typically, the spigot portion projects transversely from the web portion at least as far as the sealing lips project transversely from the web portion.
It is preferred that the web portion is provided with substantially parallel opposed radially extending surfaces which are advantageously substantially parallel to the radial direction.
In one preferred embodiment of the invention, the spigot projections are provided with respective further sealing means, such as respective peripheral sealing rims or the like.
In a further preferred embodiment, the sealing lips may be provided with annular plastically deformable rims at their transversely outermost projecting limit. Typically the seal ring is principally or wholly of metallic material.
According to a second aspect of the invention, there is provided a conduit join
REFERENCES:
patent: 1821866 (1931-09-01), Wilson
patent: 3141685 (1964-07-01), Watts
patent: 4603892 (1986-08-01), Abbes et al.
Arola Dave W.
Gordon David P.
Techlok Limited
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