US Patent No: 5,282,652
Number of patents in Portfolio can not be more than 2000
Lined pipe joint and seal
Stats
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Feb 1, 1994
Issued date -
Oct 22, 1991
filing date -
07/780,481
serial no -
In Force
status
Importance
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Abstract
A lined pipe joint with an improved collar seal and pipe lining end therefor. The pipe lining end is disposed at the end of the liner in the pipe. The lining end is adapted to shoulder against grouting material which holds the liner in place such that longitudinal contraction of the liner is prevented. The lining end also has a tapered bore therein which compensates for any inward deflection of the pipe section when threadingly engaged with a pipe fitting. The collar seal fits within the end of a pipe section which is to be connected to a pipe fitting. A sealing check valve on the collar seal provides sealing between the collar seal and the pipe section when pressure within the pipe section is greater than pressure outside the collar seal. The sealing check valve allows relief of pressure outside the collar seal into the pipe section when the pipe section is depressurized, so that damaging inward deflection of the pipe liner is prevented. A method of assembling the pipe joint is also disclosed.
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First Claim
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International Classification(s)
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Cited Art
| Patent Info | (Count) | # Cites | Year |
|---|---|---|---|
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| 4,848,807 Lip seal fitting | 3 | 1988 | |
| 4,921,258 Adapter seal | 17 | 1988 | |
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| 4,549,752 Connector for tubular members | 6 | 1984 | |
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| 4,182,519 Resilient sealing ring | 29 | 1978 | |
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| 4,856,828 Coupling assembly for tubular articles | 17 | 1987 | |
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| 4,400,019 Multilayer pipe joint | 41 | 1981 | |
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| 4,507,842 Method of sealing and protecting a plastic lined pipe joint | 20 | 1983 | |
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| 4,318,547 Devices used for the connection of pipes | 21 | 1980 | |
| 4,541,655 Pipe coupling joint | 83 | 1983 | |
| 4,664,421 Forgiving profile pipe gasket | 42 | 1986 | |
| 4,709,946 Lined pipe joint | 8 | 1987 | |
| 4,773,479 Corrosion guard tubing nipple | 6 | 1987 | |
| 4,852,655 Tubing coupling and method | 15 | 1988 | |
| 4,962,958 Lining laminate for a pipeline | 3 | 1989 | |