| 摘要 |
Flexible seals for joints in pipes for example spigots, flange and sleeve joints are disclosed. A ring seal for seating in the seal groove as a pipe joint between a first pipe and a second pipe consists of a ring body, an annular cavity defined by the ring body, a pair of annular sealing lips axially spaced on the ring body and joined by a midportion of the body and a passage through the ring body defines a fluid path from the zone between the sealing lips to a test-orifice in one of the pipes, flanges or sleeve. Various configurations of seals are disclosed. A method of pressure testing the joint is disclosed. A method of charging the joint with root growth inhibiting chemical is disclosed.
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