Seal and restraint system for plastic pipe with low friction coating
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United States of America Patent
Stats
-
May 21, 2013
Grant Date -
Oct 21, 2010
app pub date -
Nov 23, 2009
filing date -
Apr 20, 2009
priority date (Note) -
In Force
status (Latency Note)
Importance
Abstract
An apparatus for restraining plastic pipe against both internal and external forces at a pipe or fitting connection and to join and seal at least two pipes to form a pipeline is shown featuring an improved restraining and sealing mechanism. The restraining and sealing mechanism includes a circumferential housing and a companion sealing ring which are received within a mating groove provided in the belled end of a female pipe. The circumferential housing has an interior region which contains a gripping ring insert. The sealing ring and housing are integrally located within a belled pipe end during belling operations. Either the exterior of the gripping ring or the interior of the housing or both are provided with a low friction coating.
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