Hydraulic Sealing Products

Lionsele® U3 - for pistons

Lionsele® U3 is a U-seal with an asymmetric profile, manufactured in high performance polyurethane for single-action use on hydraulic pistons. Two of these seals, installed in a back-to-back arrangement, can be used on double-acting pistons.

The lip profile of this seal is designed as an interference fit within the housing. The radial squeeze provided by this action gives efficient sealing at low pressures. In operation, the seal becomes pressure-responsive to maintain sealing forces, even at very high pressures.

In addition, the asymmetric profile of the sealing lips reduces float of the seal in the housing. This improves efficiency and reduces the pumping of fluid under the sealing lip.

Special features

  • High mechanical strength polyurethane provides excellent extrusion and wear resistance to minimise plant downtime.
  • Improved sealing performance across the operational pressure range reduces power losses in the hydraulic cylinder.

Typical applications
Single-acting piston seal for hydraulic cylinders on general duty systems. For double-acting pistons, two separate seals can be used, but care must be taken to relieve any potential build up of internal pressure.

Operating capabilities

  • Maximum operating pressure: 42M{a (6092psi).
  • Temperature range: -30°C to +100°C (-22°F to +212°F).
  • Maximum surface speed: 0.5m/s (98.4fpm).

Material of construction
Precision moulded in wear-resistant polyurethane (AU/EU).

Media capabilities
Suitable for use with most mineral-based hydraulic fluids at temperatures up to 100°C (212°F). Also resistant to air, and most lubricating oils and greases. Where fire-resistant fluids of the water/oil emulsion or water/glycol types are used, please contact our Technical Support Team for advice on temperature limits.

How supplied
To suit BS ISO 5597 - Short (L1) axial length series, and BS ISO 6020-2 housings. Other sizes can be manufactured to order. Fitting instructions are supplied with every seal.


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