The Rigiflex-N type A-H steel lamina coupling developed by KRT, and distributed by the Italian Mondial, is conceived as a radially assembled unit to simplify assembly and disassembly operations.
Rigiflex-N type A-H consists of two hubs, one spacer and two lamina sets which are mounted as a subassembly already at the factory. The hubs of the steel lamina coupling are designed as a half shell which allows for radial assembly and disassembly of the overall coupling as a unit. The two semi shell hubs are each mounted via four clamping screws. Time-consuming assembly stages like heating the hubs for shrinking onto the shafts and mounting the spacer with the hubs are omitted. Besides the disassembly of the coupling does not require any tools such as pullers. Apart from that there is no risk of shafts being damaged, for example by corrosion.
The laminas of the coupling are designed as layered waisted sets that are connected with hubs and spacer via positive-locking. Since the focus with the development of the coupling was to comply with API 610 and 671, the spacer is secured by a safety catch. In case that the laminas break the spacer remains within the coupling.
The product has a compact design along with a high-power density with a low mass moment of inertia. The new steel lamina coupling is available in six sizes for shaft diameters up to 105 mm and rated torques up to 2.400 Nm. Main applications are pumps in process and chemical industry.