SELF RESTRAINED DUCTILE IRON FITTING

摘要

A combination sealing and restraint system for an as-cast ductile iron fitting for both sealing and preventing separation of an iron pipe fitting and a mating male pipe. A ring-shaped body is installed within a mating groove provided in a mouth region of the as-cast fitting. The ring-shaped body is an injection molded elastomeric material, carrying gripping segments having teeth on an inner surface thereof designed to engage an outer surface of a mating male pipe. The teeth allow movement of the male pipe in one direction relative to an end opening of the fitting during assembly, but resist movement in an opposite direction after joint assembly. The gripping segments have shelf regions which are mechanically secured to the elastomeric body of the gasket. The body also includes a relatively flexible portion formed of an elastomer which forms a lip seal region with the mating male pipe.