PIPE COUPLING

摘要

A coupling for interconnecting two double-walled pipes, e.g. production filter pipes (10, 12). The coupling may have the shape of a connector (10A, 12A) divided into two parts, each part (10A, 12A) being attachable on the end portion of a double pipe (10, 12), the parts (10A, 12A) of the connector being interconnectable, preferably mutually screwable. Such double pipes (10, 12) have two concentric liquid passages, one through the inner pipe (14) and one through the annulus-like, concentric liquid passage (20) between inner pipe (14) and outer pipe (16). In order not to block the outer concentric liquid passage (20) at the joint place (10A, 12A) so that liquid flowing therewithin must be transferred to said smaller pipe through a valve, longitudinally extending, through-going flowing channels (18) have been formed in the joint area; said channels (18) may be distributed circumferentially, thus allowing continuous flow of liquid past the coupling area (10A, 12A).