Product Overview
The UDR-Type Piston Rod Seal (Universal Directional Retrofit seal) is a high-performance, compact sealing solution specifically engineered for upgrading existing hydraulic cylinder systems and simplifying new designs. It combines robust sealing performance with exceptional space efficiency, designed to replace traditional multi-component sealing arrangements with a single, integrated unit in standard gland geometries.
Design & Construction
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Advanced Asymmetric Lip Profile: Features a precision-engineered primary sealing lip with optimized geometry that provides progressive sealing contact, ensuring effective performance from low to high pressure.
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Integrated Anti-Extrusion & Stabilizing Elements: A reinforced heel section with built-in anti-extrusion features prevents gap extrusion while providing structural stability against pressure-induced deformation.
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Compact Unibody Architecture: Engineered as a single-component seal from advanced polyurethane compounds, eliminating the need for separate anti-extrusion rings and reducing installation complexity.
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Surface-Optimized Sealing Edge: The dynamic sealing edge incorporates micro-geometry designed to maintain optimal lubrication film, reducing friction and wear.
Performance Characteristics
Key Advantages
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Space Optimization: Enables more compact cylinder designs or allows for additional components in existing space-limited applications.
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Installation Simplicity: Single-component design reduces assembly time, eliminates component stacking errors, and simplifies maintenance procedures.
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Retrofit Capability: Direct replacement for conventional multi-piece sealing systems in standard ISO 5597/6195 gland configurations without requiring gland redesign.
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Enhanced Reliability: Eliminates potential failure points associated with multi-component systems, providing more predictable performance and extended service life.
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Cost Efficiency: Reduces inventory complexity, assembly time, and potential warranty issues associated with improper installation of traditional seal stacks.
Application Domains
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Hydraulic Cylinder Retrofit Programs: Upgrading existing industrial and mobile equipment for improved performance and reliability.
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Space-Constrained Applications: Where compact sealing solutions are essential for design optimization.
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General Industrial Hydraulics: Presses, plastic machinery, metal forming equipment.
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Mobile Hydraulics: Construction, agricultural, and material handling equipment.
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Manufacturing & Automation: Where simplified maintenance and reliability are prioritized.
Installation Guidelines
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Directional Installation: The seal must be installed with the primary sealing lip facing the pressure side (typically marked on the seal).
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Gland Preparation: Clean, deburred grooves with proper chamfer (15°-20°) are essential for damage-free installation.
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Tooling Requirements: Use non-metallic installation tools to prevent damage to sealing edges.
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Lubrication Protocol: Thoroughly lubricate the seal and contact surfaces with system-compatible fluid prior to installation.
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Dimensional Verification: Confirm gland dimensions correspond precisely to manufacturer specifications for the specific UDR profile.
Technical Considerations
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Unidirectional Design: Primarily intended for single-pressure-direction applications. For pressure reversal applications, consult manufacturer for appropriate configurations.
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Contamination Management: In heavily contaminated environments, pairing with an aggressive rod wiper is recommended.
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High-Speed Limitations: For surface speeds exceeding 1.0 m/s, consult manufacturer for specialized high-speed variants.
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Extreme Pressure Applications: For sustained operation above 40 MPa, verify with manufacturer for appropriate material grades and potential need for supplementary support.
Complementary Components
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Heavy-Duty Rod Wipers: For enhanced contamination exclusion in harsh environments.
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Guide Rings/Bearing Bands: To manage side loads and prevent metal-to-metal contact.
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Static Seals: For additional sealing at gland interfaces where required.
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Surface Treatments: Advanced rod coatings (DLC, nanocomposite) to further extend seal life in abrasive conditions.
Engineering Note: The UDR-type seal represents an evolution in sealing system design, balancing performance, reliability, and installation practicality. Its primary value lies in system simplification and retrofit capability. For critical applications, always validate material compatibility, pressure-velocity (PV) limits, and installation parameters with the manufacturer’s technical documentation prior to specification.
Original source: Hydraulic seal https://www.bszzseal.com/
