IUIS (Integral Uni-Directional Inverted Scraper) is an advanced multi-functional single-acting rod seal that combines primary sealing, anti-extrusion support, and integrated scraper function into one compact component. This innovative design represents a significant advancement in rod sealing technology for hydraulic cylinders.
The IUIS features a three-in-one integrated design:
Asymmetric Primary Sealing Lip: Engineered from specially formulated polyurethane with an inverted “U” geometry optimized for pressure-activated sealing with minimal friction.
Dual-Function Support Structure: A rigid thermoplastic carrier (typically POM or PA) that provides:
Radial stability against extrusion
Built-in geometry for effective particle exclusion
Integrated Scraping Edge: A precisely angled scraping lip molded directly into the seal body, positioned to clean the rod before it enters the primary sealing zone.
Pressure-Optimized Lip Geometry: The asymmetric design ensures optimal contact pressure distribution across the pressure spectrum, from startup to maximum operating pressure.
Dual-Purpose Anti-Extrusion System: Unlike conventional designs with separate anti-extrusion rings, the IUIS incorporates this function directly into its rigid structural element.
Internal Contamination Control: The integrated scraper prevents external contaminants from reaching the primary sealing zone, significantly extending seal life in harsh environments.
Pressure Range: 0.1 – 63 MPa (dynamic), with burst pressure ratings exceeding 100 MPa
Zero-Leakage Operation: Maintains dry rod conditions across the entire operating range
Friction Optimization: Low breakout friction with stable dynamic friction characteristics
Extrusion Resistance: Withstands dynamic gaps up to 0.5 mm at maximum rated pressure
Abrasion Resistance: Specially formulated materials provide exceptional wear resistance
Temperature Performance: Standard range: -45°C to +120°C; high-temperature variants available to +150°C
IP67 Equivalent Sealing: Provides effective protection against water, dust, and fine particles
Chemical Compatibility: Resistant to UV radiation, ozone, and most hydraulic fluids including bio-degradable types
Space Efficiency: Replaces three conventional components (seal, backup ring, scraper) in a single compact envelope
Installation Simplicity: One-component installation reduces assembly time by approximately 40%
Reliability Enhancement: Eliminates inter-component gaps where pressure traps or contamination accumulation can occur
Cost Reduction: Lower total installed cost through reduced parts inventory and simplified assembly procedures
Heavy-Duty Mobile Equipment: Excavators, bulldozers, mining trucks
Offshore & Marine Systems: Harsh environment applications with high corrosion potential
Agricultural Machinery: High-contamination environments with particulate matter
Industrial Automation: High-cycle applications requiring long maintenance intervals
Special Vehicles: Military, forestry, and firefighting equipment
| Component | Standard Material | High-Performance Alternative | Special Application Options |
|---|---|---|---|
| Sealing Element | Hydrolytically stable polyurethane (95 Shore A) | Fluoro-polyurethane (for wide temp range) | PTFE-based composites (for ultra-low friction) |
| Structural Carrier | Glass-reinforced POM | Polyamide (PA) with carbon reinforcement | PEEK (for extreme temperatures) |
| Scraping Edge | Integral polyurethane formulation | Hardened thermoplastic compound | Multi-durometer construction |
Gland Design: Requires dedicated groove geometry optimized for the IUIS profile
Surface Finish: Rod surface roughness: Ra 0.05 – 0.2 μm for optimal performance
Chamfer Specifications: Minimum 20° installation chamfer with R0.5 mm minimum radius
Installation Tools: Mandatory use of manufacturer-supplied installation sleeves
Lubrication Protocol: Pre-lubrication with system-compatible grease required
| Parameter | IUIS Seal | Conventional U-Ring + Wiper | Performance Improvement |
|---|---|---|---|
| Installation Time | 1 component | 2-3 components | ~40% faster |
| Dynamic Friction | Consistent profile | Variable with wear | 15-25% more consistent |
| Contaminant Exclusion | Active scraping | Passive wiper action | 3-5x improvement |
| Pressure Cycling Endurance | 2 million+ cycles | 1-1.5 million cycles | ~35% increase |
| Extrusion Resistance | Integrated support | Separate backup ring | Higher pressure capability |
When specifying IUIS seals, consider these critical parameters:
Operating Pressure Profile (peak, average, cycling frequency)
Environmental Contamination Level (ISO cleanliness code requirement)
Temperature Extremes (including startup conditions)
Dynamic Gap Conditions (manufacturing tolerances + deflection)
Media Compatibility (including additives and contaminants)
Speed & Cycle Requirements (including dwell times)
Expected Service Life: 5,000 – 10,000 operating hours under standard conditions
Failure Indicators: Visible leakage past scraper lip, increased friction, audible rod movement
Preventive Replacement Interval: Recommended at 80% of expected service life in critical applications
Engineering Note: The IUIS design represents a patented sealing solution with performance characteristics validated through extensive testing per ISO 7986 and CETOP RP 131H standards. For application-specific validation, consult manufacturer engineering support with complete operating parameters including pressure profiles, temperature cycles, and environmental conditions.
This technical description is based on proprietary sealing technology and represents general performance characteristics. Actual performance may vary based on specific application conditions and proper installation.
Original source: Hydraulic seal https://www.bszzseal.com/
