Professional O-Ring and Oil Seal Manufacturer, Sealing Solution Supplier Since 2008.
GSD-W Heavy-Duty Reverse Step Seal
NBR & PU Material for High-Pressure Hydraulic Applications
The Heavy-Duty Reverse Step Seal GSD-W is a high-performance, industry-grade hydraulic sealing component specifically engineered to meet the rigorous demands of heavy-load, high-pressure reciprocating motion systems—equipped with precision-molded NBR/PU O-rings that form a tight, reliable bidirectional seal, effectively preventing hydraulic fluid leakage in critical components like pistons, cylinders, and valves, which is essential for maintaining optimal system pressure and avoiding costly operational downtime.
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1. Product Advantages
As a core hydraulic sealing solution from Forever Seals, the Heavy-Duty Reverse Step Seal GSD-W stands out with six key competitive strengths:
Superior Sealing Performance: Equipped with precision-engineered NBR/PU O-rings and a wear-resistant PTFE composite ring, it achieves reliable bidirectional sealing, eliminating fluid leakage even in high-pressure (up to 60Mpa) and high-frequency reciprocating scenarios—ensuring 99.9% sealing integrity for critical hydraulic systems.
Extreme Environmental Adaptability: Designed to operate stably in a temperature range of -45℃ to +110℃, it resists thermal expansion/contraction and maintains dimensional stability. The NBR/PU material combination also enhances resistance to petroleum-based hydraulic oils, lubricants, and mild industrial chemicals, avoiding material degradation in harsh working conditions.
Low-Friction & Smooth Operation: The PTFE ring’s low-coefficient surface (friction coefficient <0.05) eliminates "stick-slip" or "creep" phenomena, while the NBR/PU O-ring’s elasticity compensates for minor surface irregularities of mating parts—ensuring smooth, quiet movement of hydraulic pistons/cylinders, and reducing energy loss by up to 15%.
Long Service Life: The O-ring’s automatic wear compensation function extends the seal’s lifespan by 30% compared to standard seals; meanwhile, Forever Seals’ strict material selection (high-purity NBR/PU and food-grade PTFE) ensures resistance to aging, ozone, and mechanical wear—lowering replacement frequency and maintenance costs.
Impact Buffering Protection: Its unique reverse step structure absorbs sudden pressure spikes (up to 80Mpa instantaneous impact) and mitigates vibration, protecting hydraulic valves, pumps, and cylinders from damage—critical for heavy machinery in construction or mining.
Easy Installation: With standardized dimensions (compatible with ISO 3320 hydraulic cylinder standards) and a split-free integrated design, the GSD-W seal can be installed without specialized tools, reducing downtime during maintenance or replacement.
2. Working Principle
The GSD-W seal from Forever Seals adopts a "dual-component collaborative" working mechanism, combining the rigidity of PTFE and the elasticity of NBR/PU:
Pre-Tightening & Initial Sealing: When installed in hydraulic components (e.g., piston grooves), the NBR/PU O-ring is compressed by the mating surface, generating initial pre-tightening force to form a primary seal, blocking low-pressure fluid leakage.
Pressure-Driven Sealing Enhancement: As hydraulic system pressure increases, the fluid pushes the PTFE ring toward the sealing interface, pressing it tightly against the cylinder/piston wall—strengthening the sealing effect proportionally to the pressure (a "self-sealing" feature that ensures reliability at high pressure).
Wear Compensation: Over time, if the PTFE ring wears slightly, the NBR/PU O-ring’s inherent elasticity rebounds, pushing the PTFE ring to maintain contact with the sealing surface—sustaining sealing performance and extending the seal’s effective service life.
3. Product Details
Material Composition:
Main Sealing Ring: High-density PTFE (filled with carbon fiber for wear resistance, 15% filling ratio).
Elastic Component: NBR (acrylonitrile content 35%, Shore hardness 70±5) or PU (polyether-based, Shore hardness 85±5)—both meetRoHS and REACH environmental standards.
Dimensional Specifications:
Inner Diameter (ID): 20mm–500mm (customizable for non-standard sizes).
Outer Diameter (OD): 30mm–520mm (matching ISO 4393 piston rod standards).
Cross-Section Thickness: 5mm–15mm (optimized for high-pressure anti-extrusion).
Quality Certifications: Each GSD-W seal undergoes 100% air-tightness testing (at 70Mpa) and dimensional inspection (tolerance ±0.02mm); Forever Seals holds ISO 9001:2015 quality management certification and IATF 16949 for automotive hydraulic applications.
Packaging: Anti-static polyethylene bags (per unit) + corrugated cartons (with moisture-proof liners), suitable for long-distance transportation (temperature -30℃ to +50℃, humidity <80%).
4. Application Range
The GSD-W Heavy-Duty Reverse Step Seal by Forever Seals is widely used in hydraulic reciprocating systems across industries, including but not limited to:
Construction Machinery: Hydraulic cylinders for excavators, bulldozers, loaders, and concrete pumps (resisting dust, vibration, and high pressure).
Industrial Machinery: Pistons/seals for forging presses, ceramic brick presses, and rolling mills (withstanding high temperature and heavy impact).
Automotive & Transportation: Hydraulic brake systems, transmission systems, and heavy-duty truck lifting cylinders (compatible with automotive-grade hydraulic fluids).
Agricultural Machinery: Hydraulic components for tractors, harvesters, and irrigation equipment (resisting agricultural chemicals and outdoor temperature fluctuations).
Energy & Mining: Hydraulic seals for mining shovels, oil drilling rigs, and wind turbine hydraulic systems (withstanding harsh dust, oil, and low-temperature environments).
5. FAQ (Frequently Asked Questions)
Q1: What is the difference between NBR and PU options for the GSD-W seal?
A1: NBR is more cost-effective and excels in oil resistance (ideal for standard hydraulic oils), while PU offers higher wear resistance and mechanical strength (better for heavy-impact scenarios like forging presses). Forever Seals provides both options to match your application needs.
Q2: Can the GSD-W seal be customized for non-standard hydraulic components?
A2: Yes. Forever Seals offers custom design services—simply provide your component’s inner/outer diameter, cross-section size, and working conditions (pressure, temperature, fluid type), and our engineering team will deliver samples within 7–10 working days.
Q3: What is the recommended replacement cycle for the GSD-W seal?
A3: Under normal working conditions (60Mpa max pressure, -45℃ to +110℃ temperature), the service life is 12–18 months. For harsh environments (e.g., mining, high-frequency use), we recommend inspection every 6 months—Forever Seals also provides maintenance guidance to extend lifespan.
Q4: Is the GSD-W seal compatible with biodegradable hydraulic fluids?
A4: Yes. Both NBR and PU materials meet compatibility standards for biodegradable hydraulic fluids (e.g., vegetable-oil-based fluids). Please confirm the fluid type with our sales team to ensure optimal performance.
Q5: How to handle seal leakage after installation?
A5: First, check if the seal is installed correctly (avoid twisting the O-ring) and if the mating surface is smooth (roughness Ra ≤0.8μm). If issues persist, contact Forever Seals’ technical support team—we offer 24-hour online troubleshooting and replacement services for quality-related leaks.
6. Forever Seals’ Selling Points
As a professional sealing solution provider with 15+ years of experience, Forever Seals offers unique advantages for the GSD-W seal:
R&D Strength: 10+ senior engineers (with 8+ years in hydraulic sealing) and a dedicated lab for material testing (pressure, temperature, wear) — ensuring continuous product optimization.
Quality Assurance: 100% incoming material inspection (from reputable suppliers like Dupont for PTFE) + online production monitoring + post-production testing—defect rate <0.1%.
Global Service: 24/7 technical support (English, Chinese, Spanish) + 30+ global distribution centers (covering Europe, North America, Asia) — ensuring fast delivery (2–5 working days for stock items, 15–20 days for custom orders).
Sustainability: Forever Seals uses eco-friendly materials (RoHS/REACH compliant) and energy-saving production processes—we also offer recycling programs for old seals to reduce environmental impact.
After-Sales Guarantee: 12-month warranty for all GSD-W seals—if leakage or damage occurs due to product quality, we provide free replacement and compensate for reasonable downtime losses.
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