Innovative sealing solutions
Trelleborg has introduced a new and effective sealing solution.

The Zurcon? U-Cup RU9 performs better than standard U-Cups. Trelleborg has used advanced sealing design to engineer the Zurcon U-Cup RU9 and in tests it has proved to have better performance than standard U-Cups. This innovative seal, which is manufactured from a proprietary material and includes patented technology, is able to give longer service life in rod seal applications.

In mobile and stationary hydraulic applications, rod seals are exposed to high pressure and friction for extended periods. To achieve a long service life, seals must be wear- and extrusion-resistant, compatible with aggressive media, have a wide operating temperature range and demonstrate low friction capabilities. In addition, seals need compact installation dimensions and should be easily assembled. Zurcon U-Cup RU9 meets all these criteria and in tests, is proven to out-perform standard U-Cups.

Zurcon U-Cup RU9 was tested alongside standard U-Cups against all the main operating criteria: leakage, friction forces, level of lubricating oil and extrusion, with the last three measured over a range of pressures. In all of these tests and at all pressures, Zurcon U-Cup RU9 performed significantly better than standard U-Cups.

The superior performance of Zurcon U-Cup RU9 is partly due to one of its unique features. When the system pressure is higher, the contact surface between the Zurcon U-Cup RU9 and the piston rod becomes larger. The seal deforms to such an extent that its entire friction generating inside surface is in contact with the piston rod, improving the pressure distribution on the rod. The resulting tribological benefits (the effect of friction, lubrication, and wear of interacting surfaces) enhance the friction characteristics of the seal.

Another contributory factor is the unique patented microstructure of Zurcon U-Cup RU9, where sliding surfaces in the seal are combined with back-pumping channels. In back-pumping technology, on the forward stroke of the shaft, an oil lubricating film is distributed under the seal. On the return stroke the oil is back-pumped into the system, preventing leakage. This extends seal life by reducing dynamic friction and breakaway force, even after prolonged periods of rest.

The Zurcon U-Cup RU9 is manufactured from the Trelleborg proprietary polyurethane material specially engineered for production of sealing elements. This gives high wear resistance, low compression set, has a wide operating temperature range and almost universal media compatibility.

Turcon? M12

Turcon? M12 is the new all-round material for hydraulic applications, and it sets a new benchmark for hydraulic seals. Extensive testing has shown Turcon M12 has exceptional performance against the most important hydraulic sealing characteristics, such as wear, friction and high pressure operation. The material is also resistant to virtually all media, including a broad range of lubricants.

The cost-effective material provides customers with extended seal life, as well as a wide operating window in terms of temperature, pressure and velocity, and performs as well or better than specialised compounds in each parameter.

"Turcon M12 has exceeded even our expectations and we believe no other material can give such universally outstanding performance," says Holger Jordan, who heads up the fluid power technology department within the R&D department at Trelleborg Sealing Solutions in Stuttgart, Germany. "On almost every parameter it is better, sometimes very significantly so, than previously recommended compounds, or was at least equal to them. Despite the outstanding performance of many of our sealing materials, we don't often stand up and say that this is the best in the market. But Turcon M12 is truly unrivalled, fitting virtually all hydraulic applications," he adds.

Before its launch, Turcon M12 was put through its paces in the research lab, undergoing an extensive test programme comparing it to best-in-class compounds, against important sealing parameters. Turcon M12 was developed by Trelleborg Sealing Solutions Helsing?r, Denmark and tested in the R&D labs in Stuttgart, Germany and Fort Wayne, Indiana, US. Based on these test results, Turcon M12 is now recommended as the material of choice for a wide variety of hydraulic applications.

Features and benefits of Turcon M12

? Resistant to virtually all media including a broad range of lubricants.
? Outstanding wear resistance and friction characteristics.
? Provides extended seal life.
? Operates in wide temperature, pressure and velocity ranges.
? Minimal abrasion of hardware, preventing damage to counter surfaces.
? Robust for harsh environment.
? Good resistance to extrusion.
? Less environmental impact as it does not include bronze fillers.
? Reduced stock holding and fewer items to handle.
? Cost-effective solution.