Asymmetrical Unloaded U Cup

Unlike a standard U-cup where both sides of the seal have the same dimensions, the asymmetrical unloaded U-cup is designed to have both a static and a dynamic side.  The static side features a tall lip in order to increase the stability of the seal.  On the dynamic side, the prominent feature is a reduced height seal lip, with good film breaking capabilities.

The asymmetrical U-cup is a single direction piston seal, meaning it can only seal if the pressure is coming from one direction.  Since the sealing method is single directional, two loaded U-cups must be installed for dual direction hydraulic piston applications. 

 Applications: Medium Duty Applications such as Mobile Hydraulic; Agricultural; General Industrial

Materials: Urethane or Hytrel

Max Pressure: 5,000 psi

Temperature range: -50 °F to +250 °F

Max Velocity: 3.2 ft/sec

For more informations about this type of piston seal, visit here:

Asymmetrical U-cup