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Double-jointed gear coupling – Nominal torque range from TKN = 1,300 Nm up to 7,200,000 Nm with 31 sizes – Temperature range: from –20 °C to +80 °C
Strong and reliable
The double-jointed gear couplings from the ZAPEX ZW series compensate for angular, parallel and axial misalignment of shafts. These Flender torsionally rigid couplings are particularly suitable for use under rough operating conditions. In addition to the standard series, couplings up to 13,500,000 Nm can be supplied.
Your benefits at a glance
Low restoring forces in the case of shaft misalignment
Suitable for both directions of rotation (reversing operation) and vertical installation
Long service life and minimal maintenance requirements
Small dimensions owing to compact design for use in confined spaces
Can be used for high shock loads; with large safety reserves
Suitable for use in potentially explosive environments; certified according to 2014/34/EU (ATEX)
Made in Germany, worldwide in use
Mining and Cement: conveyor belts, apron conveyors, tube mills, rotary kilns, bunker dischargers, vertical mills, crushers, roller presses, heating technology
Steel Production: milling technology, shears, straightening machines, reversing rolling mills, pilger rolling mills, cold and hot rolling mills, high mills, coilers, roller conveyors
Cranes: hoists and luffing gear systems, slewing gear systems, trolley and travel gear systems
Marine and Shipbuilding: thrusters
Oil and Gas: installation vessels, pumps, fans, compressors, jack-up rigs
Power Generation: generators, gas turbines, water turbines
Chemicals and Pharmaceuticals: driers, pumps and compressors, mixers, agitators
Plastics and Rubber: kneaders, shredders
Pulp and Paper: woodgrinders, waste paper, wet section, dry section, smoothers and cylinders, calenders
Water and Wastewater: pumps
Food and Beverage: mixers
Sugar: countercurrent cossette mixers, sugar cane mills
Passenger transport: cable cars
Flender ZAPEX ZN couplings connect machine shafts and compensate for angular and radial misalignment. ZAPEX gear couplings from the ZN series are made of high-quality quenched and tempered steel and are manufactured according to the modular construction system.
Your benefits at a glance
Long service life and minimal maintenance requirements as a result of reliable grease lubrication of the gear teeth
Small dimensions, low weight and low mass moments of inertia are achieved by means of an intelligent design and combination of materials
Large safety reserves even at high shock loads
Maximum operational reliability through optimal tooth shape and use of high-quality materials
Suitable for horizontal mounting and, with a special design, for vertical mounting
Suitable for use in potentially explosive environments; certified according to 2014/34/EU (ATEX)
Made in Germany, worldwide in use
Mining and Cement: conveyor belts, heating technology
Steel Production: milling technology, shears, straightening machines, high mills, coilers, roller conveyors
Cranes: hoisting and luffing gear systems, slewing gear systems, trolley and travel gear systems
Marine and Shipbuilding: thrusters
Oil and Gas: installation vessels, pumps, fans, compressors, jack-up rigs
Power Generation: water turbines
Chemicals and Pharmaceuticals: driers, pumps and compressors, mixers, agitators
Plastics and Rubber: kneaders, shredders
Pulp and Paper: woodgrinders, waste paper, wet section, dry section, smoothers and cylinders, calenders
Water and Wastewater: pumps
Food and Beverage : mixers
Sugar: countercurrent cossette mixers, sugar cane mills
Passenger transport: cable cars
Flender ARPEX all-steel couplings are very compact and stand out due to their particularly good power-to-weight ratio. Their versatility makes them suitable for universal use. In these flender torsionally rigid couplings, the torque is transmitted by torsionally rigid, flexible disks. The disks are joined together with bushes and rings to form a compact disk pack which ensures easy and reliable installation.
Two disk packs connected to a spacer are capable of compensating for axial, radial and angular shaft misalignments. Couplings with one disk pack can only compensate for angular and axial misalignments.
The ARPEX coupling covers a wide range of products by means of many different series and sizes:
ARS-6 series: standard series for universal use
ARC-8 series: optimized for high torques
ARP-6 series: optimized for pump drives (according to API 610/API 671)
ARW-4/6 series: optimized for large shaft misalignments
ARF-6 series: optimized for extremely restricted space
Composite series: optimized for drives with large shaft distances
Your benefits at a glance
Compensation in angular, radial and axial shaft misalignment possible
Independent of the direction of rotation (suitable for reversing operation)
Torsionally rigid and free of circumferential backlash
Low restoring forces
Low-vibration (even with maximum permissible speeds)
Easy assembly through compact structural design
Conformity to API 610 and API 671
Suitable for use in potentially explosive environments; certified according to 2014/34/EU (ATEX)
Made in Germany, worldwide in use
Mining and Cement: conveyor belts, apron conveyors, bucket elevators, tube mills, bucket excavators, crushers, roller presses, separators, heating technology, slurry pumps
Steel Production: shears, reversing rolling mills, pilger rolling mills
Cranes: hoisting and luffing gear system, slewing gear systems, trolley and travel gear systems
Marine and Shipbuilding: single-engine ships, multi-engine ships, dredgers, generator gearboxes, installation vessels
Oil and Gas: installation vessels, pumps, fans, compressors, air condensers, jack-up rigs
Power Generation: air condensers, generators, gas turbines, cooling towers, water turbines, boiler feed pumps
Chemicals and Pharmaceuticals: driers, pumps and compressors, mixers, cooling towers, agitators, reactors
Plastics and Rubber: single- and double-screw extruders
Pulp and Paper: waste paper, wet section, dry section, smoothers and cylinders, reel winders, coating machines, calenders, wastewater purification plants
Water and Wastewater: aerators, water screw pumps
Food and Beverage: lauter tuns, reactors, agitators, mixer drives, filling systems
Sugar: generators, steam turbines, sugar cane mills
Railway Vehicles: railway couplings
Passenger Transport: cable cars
Other fields of application: test benches, wood milling, packaging machines
ARPEX ART high performance couplings consist of pure expertise combined with the greatest possible power density. These Flender torsionally rigid couplings are used in all high-speed drive systems that require torque transfer where shaft misalignment is occurring simultaneously.
The ARPEX ART leaves nothing to be desired in terms of both bore capacity and safety: their compact design allows them to compensate for all of the expected misalignments in a very small space and, at the same time, gives them the highest possible torque capacity, the lowest possible weight and a very good center of gravity.
The double-cardan principle used in the ARPEX ART enables very high radial offsets, even under great loads. With thin, individual disks, the reaction forces that occur with shaft misalignments remain relatively low. The disks of the ARPEX ART high-performance coupling consist of high-alloyed stainless spring steel, and all of the other coupling components are made of high- quality, heat-treated steel.
One strength of the Flender torsionally rigid couplings ARPEX ART is the achievable balance quality. This is the result of very high processing quality, extremely low production tolerances and high-precision assembly processes.
Your benefits at a glance
Lubrication of disks not required
Torque transfer with no play due to patented, positive compression screw fitting of the disk pack
High balance quality
Meets the requirements of API 671
Suitable for use in potentially explosive environments; certified according to 2014/34/EU (ATEX)
Easy assembly with factory-mounted half-couplings and/or transfer units
Low reaction forces
Installation and removal of the couplings without axial misalignment
Made in Germany, worldwide in use
Marine and Shipbuilding: single-engine ships, multi-engine ships, dredgers, generator gearboxes, installation vessels
Oil and Gas: pumps, fans, compressors, air condensers
Power Generation: generators, gas turbines, boiler feed pumps
Chemicals and Pharmaceuticals: pumps and compressors
Sugar: generators, steam turbines
Other fields of application: test benches
Investment costs, lifecycle costs, power-to-weight ratio, fitness for use and the cost of purchasing couplings are key considerations for equipment manufacturers. With the introduction of the new N-ARPEX all-steel multi-disk coupling Flender is continuing the success story of the proven ARPEX series of couplings.
The Flender torsionally rigid couplings N-ARPEX are currently the most powerful couplings on the market due to the consistent further development of the ARPEX – a leap in performance that in this size could only be achieved by means of various design features. With the N-ARPEX, Flender delivers the optimum price-performance ratio.
With our all-steel couplings, the reliable transmission of torque between the shafts to be connected is backlash-free, torsionally rigid and flexurally elastic. This enables these Flender torsionally rigid couplings to compensate for axial, angular and radial misalignment. Our multi-disk couplings are not prone to wear and are maintenance-free.
The couplings have been designed for use in potentially explosive environments as defined in Directive 2014/34/EU (ATEX) and comply with the requirements in standards
API 610 and API 671.
Your benefits at a glance
Lower costs through higher performance
An optimized plate pack design and a revised component design enable transmission of very high torques and speeds.
Low bearing loads through low weight
A marked increase in bore capacities with standard hubs increases performance capability and lowers the N-ARPEX’s weight.
Versatility for maximum fitness for use
Its suitability for use at low temperatures between –50 °C and +280 °C and its high misalignment capacities of up to 1° enable the N-ARPEX to be used for many different purposes in special conditions.
Easy selection and reduction in storage costs
The bundling of the ARPEX ARS, ARC and ARP series together to make a single serie N-ARPEX ARN results in a reduction in complexity from 67 to 37 couplings. Thus, storage costs are reduced. Choosing the desired coupling is much easier.
Made in Germany, worldwide in use
Petrochemistry: pumps, fans, compressors, air condensers, jack-up rigs, driers, mixers, cooling towers, agitators, reactors, installation vessels
Power Generation: air condensers, generators, gas turbines, cooling towers, water turbines, boiler feed pumps
Pulp and Paper: waste paper, wet section, dry section, smoothers and cylinders, reel winders, coating machines, calenders, wastewater purification plants
Water and Wastewater: pumps, aerators, water screw pumps
Cranes: hoisting and luffing gear systems, slewing gear systems, trolley and travel gear systems
Marine and Shipbuilding: single-engine ships, multi-engine ships, dredgers, generator gearboxes, installation vessels
