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U+S DuoSeal™ Hybrid Rod Seals | Dynamic Pressure-Adaptive Sealing System
Engineered for extreme reliability, the U+S Hydraulic Cylinder Rod Seal revolutionizes performance with its patented dual-component design. Combining a high-elasticity NBR star ring and wear-resistant PU U-ring, this piston rod seal dynamically adapts to pressure fluctuations from vacuum to 35 MPa, maintaining leak-free integrity across -30°C to +80°C temperature swings.
| Component | Function | Technical Parameter |
|---|---|---|
| Star Ring (NBR) | • Low-pressure pre-compression • Pressure transmission • Wear compensation |
Shore 70° Elastic recovery: 92% at -30°C |
| U-Ring (PU) | • Primary sealing lip • Pressure loading • Wear resistance |
Shore 93° Extrusion resistance: 35 MPa |
| System Performance | • Pressure: ≤35 MPa (retaining ring mandatory >20 MPa) • Temperature: -30°C to +80°C • Speed: ≤0.8 m/s • Media: Petroleum oils/emulsions (bio-oil incompatible) |
1. Adaptive Sealing Mechanism
Low-Pressure/Vacuum: Star ring maintains 0.3N/mm² lip preload
Pressure Surge: U-ring lip load increases proportionally with system pressure
Wear Compensation: Star ring fills U-ring gaps after 0.5mm wear depth
2. Extreme Environment Resilience
Thermal Stability: <0.5% leakage variation from -30°C to 80°C (ISO 7986-1)
Shock Load Immunity: Withstands 20 MPa/ms pressure spikes
Abrasion Resistance: 3x longer service life vs. monolithic seals in forging presses
3. Application-Specific Solutions
Telescopic Cylinders: Prevents telescoping-induced pressure fluctuations
Air Drills: Seals effectively at 0.01 MPa start-up pressure
Mobile Machinery: Resists emulsion degradation in excavator slew rings
Non-Negotiable Protocols
Pressure-Specific Setup:
<20 MPa: Standard installation
≥20 MPa: Mandatory steel retaining ring (ISO 6194)
Thermal Clearance: 0.15mm axial gap per 30°C ΔT
Damage Prevention:
Use tapered installation cones
Lubricate with polyglykol-based grease
Failure Prevention Features
Anti-rotation star ring geometry
Zero cold-flow PU formulation
| Application | Performance Data | Standard Met |
|---|---|---|
| Forging Presses | 18,000 cycles at 35 MPa | ISO 10766-1 |
| Arctic Excavators | -30°C cold start leakage: <0.1 ml/min | DIN 51801 |
| Mining Drills | 5,000hr service in slurry media | ASTM D4169 |
Ordering Reference
Example: Rod Ø50mm → U+S 50 60 6 (60mm OD × 6mm width)
Custom Configurations: U+S [Rod Ø][OD][Width]
Compliance: RoHS 3 • REACH SVHC-free • ISO 3601-3
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Main Product:
Hydraulic Seals,
Rod seals,
Piston Seals,
Wiper Seals,
Hydraulic Seals Manufacturer ,
Seals Supplier
