IMPROVEMENTS IN AND RELATING TO PIPE COUPLINGS

摘要

A push fit coupling for non-metallic gas pipes. The body (1) of the coupling has a seal (22), sealing between an external surface of the pipe (50) and an internal surface (9) of the body; a crushable ring (24) and a sleeve (32) coact by means of conical surfaces (30 and 40) to force ring (24) into locking engagement with the outer surface of pipe (50) against a stiffener (54) inserted into the end (52) of pipe (50); the stiffener has a chamfered end (57) in order to guide it past the seal (22), thus enabling easy assembly in the field. The sleeve (32) is preferably locked into the body (1) by means of a groove (10) in the body so that all internal parts of the coupling are locked in place and which further prevents tampering with components to ensure that all the necessary seals remain in place for use in the field.