17 www.stauff.com/2/en/#17 A Catalogue 2 § Edition 03/2024 System Overview 24° Tube Fittings with Soft-Sealing Cutting Ring Components AFitting Body – ISO 8434-1 / DIN 2353 BSoft-Sealing Cutting Ring CUnion Nut – ISO 8434-1 / DIN 3870 DTube End A C D B Union Nut Fitting Body Soft-Sealing Cutting Ring Tube End Soft-Sealing Cutting Rings provide an additional safety and protection against potential leakage risks, e.g. caused by the settling of purely metallic sealed connections, temperature fluctuations or considerable pressure and vibration loads in the system. "Sweating effects" on the connection points can be permanently avoided. The type FI-WDDS Soft-Sealing Cutting Ring of the STAUFF Connect range is characterised by the elastomer sealing, which is located in a specially designed groove close to the rear end of the 24° taper and protected to prevent loss. An additional o-ring is used to secure the secure the second potential leakage path between the cutting ring and the tube – even in the event of unfavourable tolerances FKM (Viton®) is used as the standard sealing material and enables problem-free use of the system for challenging applications involving high temperatures or aggressive media. Both elastomer sealings are located in the secondary sealing zone of the connection. Static and dynamic loads in the system are primarily compensated by the tried and tested metallic sealed area. When assembled, the soft-sealing elements are almost completely chambered (as gap-free and cavity-free as technically possible). This prevents extrusion of the sealings and contributes to the excellent longterm stability of the system. Type FI-WDDS Soft-Sealing Cutting Rings convince through their simple assembly in the fitting body: Use a suitable spanner to tighten the union nut until the point where the cutting ring comes into contact and sits closely with the face side of the fitting body. This point is characterised by a significant increase in force. Due to the design, the risks of insufficient assembly as well as over-assembly of cutting rings (which can lead to damage or radial constriction of thin-walled tubes) can be significantly reduced. As a matter of course, the recommended material raise in front of the first edge of the cutting ring after the completed assembly is clearly visible to tube fitters and inspectors and makes it easy to check and confirm the correct assembly – as required by the norm. Design AFirst metallic cutting edge BSecond metallic cutting edge CExternal upstream sealing ring (O-ring) 4 Internal sealing ring (O-ring) 5Block assembly (complete chambering of the soft seal) + Torque assemblies possible A B C 4 5 Features 100% final Assembly Upstream and fully chambered soft seals in the secondary area (no pressure peaks directly at the seals, long-lasting) Increase in process reliability due to lower error potential in the final suit compared to DIN 3859-2 § Torque mounting possible (block mounting) § Final tightening to the tightening limit (block). Approx. 90°-150° Proven 2 cutting edge technology § Primary metallic sealing, secondary soft sealing § Minimises possible error potential § Serves as feedback of the assembly finish Up to 500 bar in the lighter series and Up to 800 bar in the heavy series Available in steel with high quality STAUFF zinc/nickel surface and in stainless steel
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