Professional O-Ring and Oil Seal Manufacturer, Sealing Solution Supplier Since 2008.
GSD Type Piston Seal for Hydraulic Systems
Filled PTFE & Elastomer Double-Acting Sealing Element
The GSD bore seal is a premium double-acting solution for hydraulic system reciprocating pistons, featuring a bronze-filled PTFE (F-PTFE) ring paired with an NBR/FKM elastomer O-ring—ensuring top-tier durability and sealing reliability.
Its bronze-filled PTFE boosts wear resistance and strength, while the O-ring provides steady preload and wear compensation, cutting down on replacement needs and extending service life.
It handles harsh conditions effortlessly: 0-60MPa pressure, -30℃ to +260℃ temperature (elastomer-dependent), with low friction (no "stick-slip") and strong anti-extrusion performance to avoid leaks or pressure loss.
Compatible with petroleum-based oils, fire-resistant fluids, and eco-friendly bio-oils, it fits heavy-duty gear like injection molding machines, bulldozers, and presses, adapting to long/short strokes.
Its simple groove design eases installation/maintenance (reducing downtime), while leak-proof sealing protects system components—boosting equipment efficiency, safety, and your return on investment.
Its bronze-filled PTFE boosts wear resistance and strength, while the O-ring provides steady preload and wear compensation, cutting down on replacement needs and extending service life.
It handles harsh conditions effortlessly: 0-60MPa pressure, -30℃ to +260℃ temperature (elastomer-dependent), with low friction (no "stick-slip") and strong anti-extrusion performance to avoid leaks or pressure loss.
Compatible with petroleum-based oils, fire-resistant fluids, and eco-friendly bio-oils, it fits heavy-duty gear like injection molding machines, bulldozers, and presses, adapting to long/short strokes.
Its simple groove design eases installation/maintenance (reducing downtime), while leak-proof sealing protects system components—boosting equipment efficiency, safety, and your return on investment.
5.0
design customization
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1. Product Advantages
The GSD bore seal, engineered by Forever Seals, stands out as a high-performance solution for hydraulic system reciprocating pistons, with advantages that address industrial sealing pain points:
Enhanced Durability: Built with bronze-filled PTFE (F-PTFE) as the core sealing ring, it delivers exceptional wear resistance and mechanical strength, outperforming standard seals in high-frequency, long-term reciprocating motion.
Long-Lasting Sealing Reliability: Paired with NBR or FKM elastomer O-rings, the seal maintains consistent preload and automatic wear compensation—preventing leaks even as the PTFE ring ages, and reducing unplanned maintenance.
Broad Operating Adaptability: Handles pressure ranges from 0 to 60MPa and temperatures from -30℃ to +260℃ (elastomer-dependent), making it suitable for high-pressure shock systems (e.g., hydraulic presses) and extreme-temperature environments (e.g., industrial ovens).
Smooth & Precise Operation: Low friction coefficient eliminates "stick-slip" or creep issues, ensuring stable piston movement that boosts the precision and efficiency of hydraulic equipment (e.g., injection molding machines).
Cost-Effective Maintenance: Simple groove design simplifies installation, while the wear-compensating structure cuts down on replacement frequency—lowering overall operational and labor costs.
2. Working Principle
The GSD bore seal adopts a synergistic two-component design to ensure reliable sealing:
Primary Sealing (Bronze-Filled PTFE Ring): Directly contacts the piston and cylinder inner wall to block fluid leakage. Its high hardness and wear resistance withstand continuous reciprocating friction, avoiding deformation or damage under pressure.
Preload & Compensation (Elastomer O-Ring): The NBR/FKM O-ring applies constant pressure to the PTFE ring during initial installation, ensuring tight contact with the sealing surface. As the PTFE ring wears over time, the O-ring’s elasticity pushes the PTFE ring outward, compensating for wear and maintaining consistent sealing performance.
Anti-Trapping & Anti-Extrusion: This structure avoids pressure trapping (a common issue in traditional seals) and maintains integrity even in systems with larger piston clearances—preventing leaks and pressure loss.
3. Product Details
Core Materials
Sealing Ring: Bronze-filled PTFE (F-PTFE) – offers high chemical stability, low friction, and enhanced wear resistance (ideal for heavy-duty reciprocation).
Elastomer Component:
NBR: Cost-effective option for standard oil-based hydraulic media (suitable for -30℃ to +120℃).
FKM: High-temperature/chemical-resistant option for harsh media (e.g., fire-resistant fluids, corrosive agents) – works up to +260℃.
Key Specifications
Sealing Direction: Double-acting (seals fluid on both sides of the piston, suitable for bidirectional motion).
Size Compatibility: Customizable for non-standard cylinder bore diameters; standard models fit common hydraulic cylinder sizes (refer to Forever Seals’ technical drawings for size ranges).
Compliance: Meets global industrial hydraulic sealing standards; materials are non-toxic and compatible with eco-friendly media (e.g., bio-oils).
4. Application Range
The GSD bore seal is widely trusted in heavy-duty and precision equipment across industries, including:
Plastic & Rubber Machinery: Injection molding machines, extruders (sealing for injection/ extrusion cylinders).
Construction Machinery: Bulldozers, excavators, cranes (sealing for hydraulic arms, lifting cylinders).
Agricultural Machinery: Tractors, harvesters (sealing for hydraulic control systems, implement cylinders).
Industrial Presses: Hydraulic presses, stamping machines (sealing for high-pressure working cylinders).
General Machine Tools: Lathes, milling machines (sealing for hydraulic feed and clamping cylinders).
5. FAQ (Frequently Asked Questions)
Q1: Can the GSD bore seal be used with water-based hydraulic fluids?
A: Yes. The bronze-filled PTFE ring and FKM elastomer (optional) are fully compatible with water-based, fire-resistant, and eco-friendly hydraulic fluids. Contact Forever Seals’ team to confirm elastomer selection for your specific media.
A: Yes. The bronze-filled PTFE ring and FKM elastomer (optional) are fully compatible with water-based, fire-resistant, and eco-friendly hydraulic fluids. Contact Forever Seals’ team to confirm elastomer selection for your specific media.
Q2: What is the expected service life of the GSD bore seal?
A: Under normal conditions (0-60MPa, -30℃ to +120℃ for NBR), the seal lasts 18-24 months. For FKM models in high-temperature environments (+120℃ to +260℃), lifespan is 12-18 months. Forever Seals’ optimized formula extends lifespan by 50% compared to industry averages.
A: Under normal conditions (0-60MPa, -30℃ to +120℃ for NBR), the seal lasts 18-24 months. For FKM models in high-temperature environments (+120℃ to +260℃), lifespan is 12-18 months. Forever Seals’ optimized formula extends lifespan by 50% compared to industry averages.
Q3: Do I need to modify my hydraulic cylinder’s groove to install the GSD seal?
A: No. The GSD bore seal follows standard hydraulic piston seal groove dimensions—no modification is required for most standard cylinders. Forever Seals provides a groove dimension chart for compatibility checks.
A: No. The GSD bore seal follows standard hydraulic piston seal groove dimensions—no modification is required for most standard cylinders. Forever Seals provides a groove dimension chart for compatibility checks.
Q4: How fast can I get a custom sample of the GSD seal?
A: Forever Seals offers fast custom sample production: 3-5 working days for non-standard sizes, pressure ranges, or media-specific designs.
A: Forever Seals offers fast custom sample production: 3-5 working days for non-standard sizes, pressure ranges, or media-specific designs.
6. Company Selling Points (Forever Seals)
About Forever Seals
With over 15 years of experience in the sealing industry, Forever Seals is a technology-driven enterprise specializing in seal production, material R&D, and custom sealing solutions. Our 150-strong team combines engineering expertise and manufacturing precision to serve global clients.
Technical Leadership
Our R&D team spent years optimizing the bronze-filled PTFE formula for the GSD seal, resulting in 50% longer lifespan than industry benchmarks.
We solve complex sealing challenges in special working conditions (e.g., ultra-high pressure, corrosive media) with tailored designs.
Customization & Speed
Tailor-made seals for non-standard cylinder sizes, pressure requirements, or special media (e.g., corrosive fluids).
3-5 working days for custom samples – accelerating your product testing and launch timelines.
Quality Commitment
100% quality inspection: Every GSD seal undergoes 60MPa static pressure testing (30 seconds) and dimensional checks before delivery.
12-month warranty for standard products – covering manufacturing defects and performance issues.
Global Support & Logistics
Global warehouse network: Delivery of standard GSD seals within 3-7 days to most regions.
24/7 technical support: Online consultation and on-site service (available in key markets) to resolve installation or performance issues promptly—minimizing your equipment downtime.
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