Pipes and tubular conduits – With closures and plugs – Inflatable
Patent
1984-06-01
1986-12-09
Jones, Larry
Pipes and tubular conduits
With closures and plugs
Inflatable
383 3, 383126, 383115, 383117, F16L 5512
Patent
active
046274707
ABSTRACT:
In an iris-stop arrangement for stopping-off a duct the secondary bag has a contact length with the duct of at least 0.7 times its diameter. The apparatus is such that the point where the inflation neck of the bag meets the remainder of the bag can adopt a position not substantially in front of the secondary bag support member. Thus the bag has improved functional grip on the duct and does not suffer severe flexing at the neck when it moves back to rest against the support member. Preferably the portion of the bag which contacts the duct in use is a single layer of fabric thick while the ends of the bag, which have to withstand the bag inflation pressure unsupported, are two layers thick. In this way the bag can have good performance characteristics while only needing a relatively small insertion hole in the side of the duct.
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ALH Systems Limited
Jones Larry
Price Carl D.
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