Fire resistant seal
First Claim
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1. A fail-safe fire retardant seal assembly for use in a segmented pipe-coupling of the type including plural coupling segments adapted to be secured in encircling relationship about the juxtaposed ends of pipes, and which provide an internal annular channel for the reception of said seal assembly, said seal assembly including:
- an annular seal member formed from a thermally destructible elastomeric material, said seal member comprising an annular body having mutually presented sealing lips on an inner periphery thereof, said sealing lips extending towards each other and terminating in free edges which seal against the ends of the pipes, said free edges being mutually presented and spaced from each other to define a circumferentially extending slot in the inner periphery of said annular body; and
,an annular ring of a fire resistant material positioned substantially in co-axial alignment with the longitudinal axis of said annular seal member and supported by said seal member, said fire ring extending to opposite sides of a plane radial to the longitudinal axis of said annular body and which lies intermediate the free ends of said mutually presented sealing lips, said fire ring extending axially of said seal member and including at least a portion of said fire ring positioned radially inwardly of said sealing lips and which provides for direct, bridging, sealing engagement with said pipe ends, whereby said fire ring provides a direct seal with said pipe ends in the event of thermal destruction of said seal member.
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Abstract
A seal assembly for incorporation into a pipe coupling has a fire-ring which is adapted to seal against the juxtaposed ends of pipes and provide a substantial seal between the pipe ends in the event that the body of the elastomeric seal is subjected of thermal destruction.
64 Citations
20 Claims
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1. A fail-safe fire retardant seal assembly for use in a segmented pipe-coupling of the type including plural coupling segments adapted to be secured in encircling relationship about the juxtaposed ends of pipes, and which provide an internal annular channel for the reception of said seal assembly, said seal assembly including:
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an annular seal member formed from a thermally destructible elastomeric material, said seal member comprising an annular body having mutually presented sealing lips on an inner periphery thereof, said sealing lips extending towards each other and terminating in free edges which seal against the ends of the pipes, said free edges being mutually presented and spaced from each other to define a circumferentially extending slot in the inner periphery of said annular body; and
,an annular ring of a fire resistant material positioned substantially in co-axial alignment with the longitudinal axis of said annular seal member and supported by said seal member, said fire ring extending to opposite sides of a plane radial to the longitudinal axis of said annular body and which lies intermediate the free ends of said mutually presented sealing lips, said fire ring extending axially of said seal member and including at least a portion of said fire ring positioned radially inwardly of said sealing lips and which provides for direct, bridging, sealing engagement with said pipe ends, whereby said fire ring provides a direct seal with said pipe ends in the event of thermal destruction of said seal member. - View Dependent Claims (2, 3, 4, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20)
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- 5. The seal assembly of claim 21, in which said fire ring is supported by a radially inwardly extending annular flange integral with said seal member, and which extends into engagement with an outer periphery of said fire-ring
Specification