Abstract: In a cleaning system for heat exchanger tubes each tube has a chamber at its end for capturing a tube cleaning element such as a brush that is subject to being propelled in opposite directions through the tube by reversing the direction of fluid flow therein. Novel means are provided for enabling access to the tube through the chamber for such purposes as replacing brushes and admitting a flaw detector to the tube.

Abstract: A fluid flow diverter or reverser comprises a housing having a transverse separator wall dividing it into first and second axially adjacent chambers. The first chamber has a diametrally extending separator wall dividing it into subchambers. Each subchamber has an inlet or outlet, respectively, to which a conduit, that may serve as the feed or return of a process loop circuit or the feed or return of a fluid supply circuit, is connected. The transverse wall has a pair of openings which communicate the respective subchambers with the second chamber. The second chamber has inlet and outlet openings, respectively, which can connect to a fluid supply and return circuit or a process loop circuit. A diverter blade in the second chamber is reversibly rotatable for changing direction of fluid flow between the inlets and outlets and, hence, in the loop circuit.