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BU Series Ultra-High Pressure Piston Rod Seals | Heavy-Duty Hydraulic Buffer Seal Solutions
Engineered for extreme-pressure environments, the BU Series Hydraulic Cylinder Rod Seal redefines reliability in construction machinery and hydraulic systems operating under brutal conditions. As a dual-lip buffer seal, it excels in managing pressure spikes up to 1,000 bar—far surpassing conventional piston rod seals. Its innovative structure isolates and redirects system pressure, preventing seal extrusion while maintaining stability in ISO 7425/II and 5597/I-compliant grooves. Whether deployed individually or in series, the BU series ensures leak-free performance in mobile equipment, offering a 30% cost-saving alternative to complex multi-seal configurations.
Unrivaled Technical Specifications
Built to endure the toughest workloads, the BU Piston Rod Seal delivers:
Continuous Pressure: ≤500 bar (7,252 psi) | Peak Pressure: 1,000 bar (14,504 psi)
Temperature Range: -35°C to +100°C
Reciprocating Speed: ≤0.5 m/s (19.7 in/s)
Material: 93 Shore imported polyurethane (20% higher heat resistance vs. standard PU)
Media: Mineral oil-based hydraulic fluids
Key Advantages: 45% lower compression deformation, ISO-compliant groove fit (H8/f7 tolerance), and anti-extrusion reinforcement.
Engineered for Critical Buffer Applications
The BU Hydraulic Cylinder Rod Seal thrives in high-shock environments like mining shovels, offshore rigs, and tunnel boring machines. Its dual-lip design creates a dynamic pressure buffer zone, redistributing extreme forces back into the system to prevent seal blowout. Rigorously tested under 1,000 bar surges, this seal reduces downtime by 60% in applications prone to pressure peaks, while its cold-flexible polyurethane ensures reliable sealing at -35°C. Unlike traditional buffer seals, the BU series requires no pre-load adjustments and installs seamlessly into closed grooves.
Installation Excellence & Custom Tooling
To optimize performance:
Axial Clearance: Adhere to H/L column specifications for thermal expansion management.
Groove Compatibility: Designed for ISO 7425/II grooves—use tapered installation sleeves to protect lips from sharp edges.
Tooling Solutions: Request custom H8/f7-tolerance installation tools for restricted-access assemblies (provided free with bulk orders).
Surface Finish: Pair with hardened chrome rods (surface roughness ≤0.25μm Ra) to minimize lip wear.
Why BU Series Stands Out
Pressure Redistribution: Unique lip geometry converts peak loads into stabilized system pressure.
Hydrolysis Resistance: Enhanced polyurethane resists moisture degradation in humid environments.
Zero Break-In Period: Pre-lubricated design ensures immediate performance post-installation.
Backed by a 24-month performance warranty, the BU Series is the go-to rod seal for OEMs tackling 1,000 bar challenges. Download our buffer seal pressure management whitepaper or schedule a free groove design consultation today!
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Main Product:
Hydraulic Seals,
Rod seals,
Piston Seals,
Wiper Seals,
Hydraulic Seals Manufacturer ,
Seals Supplier
