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Unloaded U-Cups
The urethane U-cup design provides an excellent heavy-duty seal for both piston or rod applications. Urethane U-cups, commonly known as Disogrin U-cups, work well in both static and dynamic applications.



Profiles

Rod Unloaded U-Cup

The rod style unloaded U-cup was designed with a shorter, heavier inside sealing lip to achieve a higher initial sealing force on the tube. The rod style unloaded U-cup was developed to extend serviceability and improve reliability in rod sealing.

Rod Unloaded U-Cup with D-Lock

The rod style unloaded U-cup is available in a double lip design. The secondary "bump" or lip on the inside heel of the seal provides additional stability in the seal groove. The increased stability enhances the long-term performance of the seal. In rod seal leakage test, the double-lipped rod style unloaded U-cup had better performance then the conventional U-cup. This is due to the initial leakage of the seal is being reduced by the secondary sealing lip.

Symmetrical Unloaded U-Cup

This design provides satisfactory service for most rod and piston sealing applications. For more demanding applications with higher temperatures and pressure, other designs should be considered.
Piston Unloaded U-Cup

The piston style unloaded U-cup was designed with a shorter, heavier outside sealing lip to achieve a higher initial sealing force on the tube. The piston style unloaded U-cup was developed to extend serviceability and improve reliability in piston sealing.
Piston Unloaded U-Cup with Anti-Extrusion Ring

Unloaded piston U-cups are also available with anti-extrusion rings. The profile fits a standard u-cup gland, while providing increased extrusion resistance.