Frequently Asked Questions about Supa Maxi™

Why did you choose to design the couplings with bolts to be tightened from the sleeve side?

Actually our first prototype was made with bolts tightened from the other side, but in a field trial we learned that when space in the trench is limited, it is much easier to tighten the bolts from the sleeve side.

Is it necessary to cross-tighten the bolts?

Yes, like for all other mechanical couplings it is recommended to cross-tighten the bolts. However, due to the unique design of the AVK coupling the bolts can be tightened individually to compensate for any ovality the pipe may have. To ease installation it is also recommended to pre-tighten the bolts before installing the coupling on the pipe. This ensures an even torque on the gasket and grip segments as well as making the installation faster in the uncomfortable surroundings of a pipe trench.

What am I supposed to do with the centre piece of the protection cap, after having torn it off?

It is made of recyclable PE, so scrap it in the same way as you do with other PE material.

Why have you chosen to deliver the couplings with permanent protection caps?

In our research prior to product development we learned from several customers that dirt from the trench normally finds it way into the gasket. Furthermore, the tightening of bolts and nuts at a specific torque is difficult with sand and debris in the threads. Consequently AVK designed a protection cap that covers the gasket and bolt threads to achieve an easier installation and maximum tightness.

Why is it not necessary to re-tighten the bolts after installation?

AVK uses an all-metal grip construction, and therefore compression will not be lost over time. This is the case when using plastic supports as an integrated part of the gasket system, since most plastics cold floats over time which causes a need for re-tightening the bolts.

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