Bocholt: Flender is rounding off its range of N-Arpex couplings, first introduced in 2017, with two new designs featuring eight and ten bolting points. N-Arpex now covers a diameter up to 988 mm and a torque up to 2,000,000 Nm. The compact design and enhanced bore capacities also enable a leap in size. A smaller coupling transmits a higher torque compared to the predecessor model Arpex. Flender thus further optimises the price-performance ratio. The torsionally rigid all-steel disc coupling is suitable for use in drive applications including pumps, fans, compressors, generators, turbines, and paper and printing machines.
A new, more compact Flender conical bolt connection for the plate packs enable quick and easy installation of the N-Arpex couplings, especially in high torque ranges. This new addition enhances the power density of the N-Arpex series. The revised component first appeared in 2017 with the ARN-6 type. Its compact design and enhanced bore capacities already ensured an optimal ratio between torque and use of materials. The N-Arpex thus focusses even more sharply on the price – performance ratio.
With the two new N-Arpex couplings, Flender has introduced a modular system which increases the number of available types as well as simultaneously reducing the number of components required. The three standard series of the predecessor Arpex merge into one N-Arpex series. This standardization simplifies storage, making the couplings more readily available and reducing spare parts complexity for the customer.
N-ARPEX – The new all-steel disc coupling from Flender
The new series of couplings has also been designed for use in potentially explosive environments as defined in directive 2014/34/EU and fulfil the requirements of API610/ISO13709 and API671/ISO10441. N-Arpex all-steel couplings are designed as standard for use at very low temperatures down to -50 degrees Celsius. With these all-steel couplings, transmission of torque between the machine shafts accompanied by displacement compensation is backlash-free, torsionally rigid and flexible. This enables them to simultaneously compensate for axial, angular and radial offset. The N-Arpex coupling plate packs are made of stainless spring steel, are not subject to wear and are therefore maintenance-free.