Patent ID: 6457718
Filing Date: 2002-10-01
Classification: F16L

Abstract:
A method of forming a pipe joint between a metal spigot pipe having an outside surface and a spigot end, and a metal belled pipe end having an annular groove located therein intermediate a pipe interior bore and an outer extent of the belled end, the method comprising:providing an elastomeric gasket having a compression seal region and a retainer region joined by means of an extensible sleeve region therebetween, the retainer region including a rigid, circumferential retainer ring therein for forming a fluid tight seal at the spigot pipe end; inserting the gasket into the annular groove of the belled pipe end such that the seal region abuts the annular groove and the retainer region protrudes away from the outer extent of the belled end in the direction of the pipe interior bore, the gasket being received entirely within the belled pipe end without extending beyond the outer extent thereof; inserting the spigot pipe end into the belled pipe end having the gasket located therein until the spigot end sealingly engages the retainer region, the sleeve and retainer regions being extended by movement of the spigot pipe end within the belled pipe end, whereby the retainer ring forms a lip around the inserted spigot pipe end, thereby forming a fluid tight interface against the spigot pipe to prevent contact between fluids flowing through the pipes and the spigot pipe end and outer surface.