Tube fitting enables safe and repeatable assembly and reliable leak-free operations
This news story was first published in the October 2021 issue of Sealing Technology newsletter.
To eliminate the risk of leaks, WALRINGplus features both optimum metal-to-metal sealing and additional soft sealing on both possible leak paths – the cutting ring cone and the cutting ring inner area (photograph courtesy of Danfoss Power Solutions).

Power management company Eaton – now part of Danfoss Power Solutions (Sealing Technology, September 2021, page 2) – recently expanded its product portfolio with the addition of the robust WALRINGplus soft seal cutting ring system, optimised for thin-wall tubing.

Featuring a two-edge cutting ring, with additional soft sealing for both possible leak paths, this tube fitting system enables easy, safe and repeatable assembly and reliable, leak-free operations.

It is designed to meet demanding requirements, involving hydraulic tube fitting in applications including use in agriculture, construction, commercial vehicles, discrete manufacturing, rail transportation and other industries.

It is suitable for use with thin-walled tubes and, therefore, supports efficient weight and fuel reduction of mobile machinery and moving parts of stationary machinery.

Correct assembly is crucial to tube fitting performance and WALRINGplus is designed to prevent excessive or insufficient tightening. A clear block-stop function provides a tangible torque increase when the end of an assembly is reached, so no torque or distance measurement is required.

In addition, a significantly lower force is needed to pull the cutting ring over the tube – making assembly easier, faster and safer, whilst reducing the risk of damage to the soft seal. The O-ring groove position also enables frequent reassembly, without affecting performance.

To eliminate the risk of leaks that can create costly damage and downtime, WALRINGplus also addresses their common root causes.

Soft sealing prevents leakages if: tubes or studs are slightly scratched, the fluid temperature fluctuates or the retention force is reduced. Problems caused by low assembly torque also can be identified before the cutting ring is pulled from the tube – reducing the risk of a catastrophic failure in application.

The bespoke M-R7 machine further reduces assembly time and the effort required for WALRINGplus as well as the risk of leaks. By automating the process of cutting-ring assembly and tube-forming, this machine helps ensure optimum system performance whilst also reducing the required torque and rotrotation.

Specifications of WALRINGplus:
• steel cutting ring with Viton O-rings;
• for tube sizes 6–42 mm;
• complies with ISO 8434-1;
• high burst-pressure exceeding 4:1 safety factor;
• working pressure up to 500 bar (L-series) and 800 bar (S-series); and
• supports dry assembly with steel components.