RADEX®-N NANA 3(API 610)
Product characteristicsCoupling description The RADEX®-N is a backlash-free, torsionally rigid and maintenance-free all-steel coupling. The laminae that are extremely rigid in sense of rotation are made from high-strength, stainless spring steel and enable a compensation for high displacements with low restoring forces. By reason of the all-steel design the RADEX®-N can be used in drives with temperatures of up to 280 °C.
FEM-optimized laminae form
The steel laminae packings from stainless spring steel were developed on the basis of FEM calculations. Under consideration of the necessary possibilities of displacements of the coupling the optimal form regarding torque transmission and torsional rigidity was aimed for. The fitted form of the steel laminae at the outside diameter is the result of this optimization calculation.
Laminae packings with sdowel screws
The „heart“ of the steel laminae coupling are the laminae packings and their connection to the hubs or spacers. High-strength, special dowel screw that are alternately screwed with hubs and spacer enable a combination of frictional engagement and positive locking. Thus a high power density with simultaneous easy displacement and low restoring forces is guaranteed. Due to the special constructive design of the RADEX®-N components the laminae packings are „artificially“ prestressed. Hereby the torsional rigidity of approx. 30 % is enabled and at the same time the known problem regarding the axial vibrations of the spacer is avoided. Explosion protection use
RADEX®-N couplings are suitable for power transmission in drives in hazardous areas. The couplings are certified and confirmed according to EC standard 94/9/EC (ATEX 95) as units of category 2G/2D and thus suitable for the use in hazardous areas of zone 1, 2, 21 and 22. Please read through our information included in the respective Type Clamping ring hubs (clamping hub without dowel screw only for category 3) used in hazardous areas must be selected in a way that there is a safety of s = 2 from the peak torque of the unit including all operating parameters to the torque of frictional engagement and to the nominal torque of the coupling. Examination Certificate and the operating and mounting instructions at www.ktr.com. API 610
RADEX®-N NANA 3 was developed specifically for the pump industry and corresponds to the specifications of the API 610 standard. It is used on process pumps in the chemical and petrochemical industry. Subject to its excellent properties of misalignment the coupling is extremely suitable for the use on hot media pumps, too. Other applications are water pumps, sewage pumps and discharge pumps in marine technology.