U+S Hydraulic Cylinder Rod Seal

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.

Core Technology & Specifications

Critical Performance Advantages

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

Installation & Engineering Guidelines

Non-Negotiable Protocols

1. Pressure-Specific Setup:

   • <20 MPa: Standard installation

   • ≥20 MPa: Mandatory steel retaining ring (ISO 6194)

2. Thermal Clearance: 0.15mm axial gap per 30°C ΔT

3. Damage Prevention:

   • Use tapered installation cones

   • Lubricate with polyglykol-based grease

Failure Prevention Features

• Anti-rotation star ring geometry

• Zero cold-flow PU formulation

Industry Validation & Ordering

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