Supa Maxi™ universal tensile couplings
Supa Maxi™ sets a new standard
Supa Maxi™ consists of a complete range of large tolerance universal and tensile couplings according to EN 14525 for water, gas and wastewater applications. The straight couplings are available in DN50-800, flange adaptors are available in DN40-800, end caps in DN50-400, and step couplings and transition couplings are available in DN50-300. In addition, Supa Maxi™ gate valves in DN 80-300 for water and wastewater are part of the range. The patented SupaGrip™ sealing support system features a flexible bracket, and combined with the unique grip design, it provides superior tightness and tensile resistance on all pipe dimensions and materials.
See the complete Supa Maxi™ range here.
Flexible bracket with rigid metal backup
SupaGrip™ provides full support of the gasket, even on minimum pipe size within the tolerance range and when used on oval pipes. The flexible bracket is designed to contract and follow the external pipe diameter. As a result, it serves as a solid support for the gasket and enables full angle deflection of 4°.
When tightening the bolts, the bracket segments and bolts move inwards, securing that the gasket tightens around the pipe and that the grip segments grip into the pipe surface.
Tensile on all pipe materials
Optimum grip and tensile abilities on all pipe materials are secured by means of two different metal grip segments: brass for PE/PVC/GRP and hardened stainless steel for cast iron, ductile iron, steel, stainless steel and AC pipes. The grip segments are mounted with polyamide pins on the bracket segments to provide maximum durability. The high quality materials safeguard that the sealing does not loose compression over time, ensuring that the coupling remains tensile and sealed.
Designed according to EN 14525
All AVK Supa Maxi™ couplings are PN16 rated and are designed and tested according to EN14525 (approval testpressure 26 bar). They have a Kiwa certificate in compliance with Kiwa’s evaluation guideline BRL-K775 concerning EN 14525 requirements.
During the development phase of Supa Maxi™ couplings, AVK joined forces with Kiwa in the Netherlands and DTI in Denmark to define a valid test procedure.
Read more about the test procedure.
Reduce time spent on installation
The couplings enable ±4° angle deflection on each side up to a maximum pressure of PN16. The large insertion depth tolerances allows the pipe to be cut slightly and the pipe will not move inwards when tightening the bolts. This ensures an easy installation without need for precise adjustment. All couplings with a weight exceeding 10 kilos are designed with a lifting eye on the sleeve enabling easy and ergonomically safe handling.
The Supa Maxi™ gate valve provides extra safety when repairing old pipes. With a built-in Supa Maxi™ gate valve it is easy to shut-off the water in case of repair or replacement of the pipe.
Optimised bolt design
The integration of the bolts into the design has been optimised so that quick and and easy assembly is possible. The number of bolts is limited to a minimum and can be mounted with standard tools. The bolts and nuts have anti-friction coating to prevent galling. The bolts are tightened from the sleeve side to simplify installation when space in the trench is limited and the threads are protected by the permanent protection cover. The nuts are encased in the bracket and covered by the protection cover to ensure they will not fall out when loosening the bolts. No re-tightening is acquired thanks to the all-metal SupaGrip™ sealing support system.
Permanent protection cover
During handling and storage covers the centre piece of the protection covers the sharp grip segments and prevents dirt from settling inside the coupling. Only when the centre piece is removed, the coupling is ready for installation.
High quality materials
- The couplings consist of nodulair cast iron bodies and cast steel pressure rings with an epoxy coating in accordance with DIN 3476 part 1 and EN 14901, GSK approved.
- The EPDM rubber gaskets are approved by KIWA, ACS and SVGW for drinking water applications.
- The bolts and washers are standard in stainless steel A2 and optionally in A4. The nuts are made of acid-resistant stainless steel A4 and have an anti-friction coating to prevent galling.
- The tensile grip segments are made of zinc-free bronze RG5 and hardened stainless steel, mounted with polyamide pins on the bracket segments.
- The permanent protection covers are made of recyclable PE in black for water and wastewater and yellow for gas.
