1. Double-lip Sealing System
The patented double lip seal (Fig. A) of the NORMACONNECT® pipe connection offers double safety; it provides maximum tightness at both low and high operating pressures.
When the bolts are tightened sealing lip 1 is pressed on sealing lip 2 in such a way that also at low system pressures (gas) at vacuum or at high loads acting on the joint an excellent sealing effect is achieved (Fig. B).
Due to the special design of the sealing lips the sealing effect is even stronger when the internal pressure rises. With the increasing system pressure (P) the sealing lips are pressed more firmly onto the pipe surface (Fig. C).
2. Standard Strip Insert
All NORMACONNECT® pipe couplings are factory equipped with the standard strip insert (2). The strip insert protects the sealing sleeve from increased mechanical and chemical loads. It also prevents the sealing sleeve from moisture expansion and allows larger gaps between the pipe ends to be connected.
Furthermore, it allows larger angular deflections and misalignment.
With the strip insert the couplings can also be used for both vacuum and high pressure applications without any problems. The strip inserts are made from plastic material or stainless steel and should be chosen depending on the application and the pipe material.
3. Heavy-duty Lock Bars
For NORMACONNECT® pipe couplings we use lock bars (3) with a larger diameter. Thus the rigidity of the coupling is increased and the engagement of the threaded end of the locking bolts is considerably improved.
4. Anchoring Ring with conically stamped teeth
The anchoring ring (4) with conically stamped teeth indents into the pipe surface and provides safe and stong axial restraint. Owing to the special design the coupling is able to withstand even high vibration loads.
5. Protection Ring
The protection ring (cf. FLEX / FLEX E) protects the sealing sleeve from UV rays, fire, etc. and increases the flexural strength of the coupling.