Professional O-Ring and Oil Seal Manufacturer, Sealing Solution Supplier Since 2008.
HBY Combined Buffer Polyurethane Seal Ring for Construction Machinery
Ideal for Excavators, Hydraulic Cylinders & Mobile Hydraulic Equipment
Core Points: Suitable for construction machinery like excavators and cylinders; max pressure ≤50MPa, max speed ≤1.5m/s, temperature resistance -55℃ to +120℃, multiple specs available.
Details: Composite structure of polyurethane seal ring + POM/PA backup ring, with stable dimensions and excellent elasticity.
Functions & Roles: Efficiently seals media such as hydraulic oil, water and gas; prevents leakage, resists extrusion, and ensures stable equipment operation.
Advantages & Value: High wear resistance and strong mechanical strength extend equipment maintenance cycles; adapts to various working conditions to reduce replacement costs. It provides reliable sealing protection for hydraulic systems and supports efficient equipment operation.
Details: Composite structure of polyurethane seal ring + POM/PA backup ring, with stable dimensions and excellent elasticity.
Functions & Roles: Efficiently seals media such as hydraulic oil, water and gas; prevents leakage, resists extrusion, and ensures stable equipment operation.
Advantages & Value: High wear resistance and strong mechanical strength extend equipment maintenance cycles; adapts to various working conditions to reduce replacement costs. It provides reliable sealing protection for hydraulic systems and supports efficient equipment operation.
5.0
design customization
Please fill out the form below to request a quote or to request more information about us. Please be sure to upload customized requirement documents or pictures, and we will get back to you as soon as possible with a response. we're ready to start working on your new project, contact us now to get started.
Please fill out the form below to request a quote or to request more information about us. please be as detailed as possible in your message, and we will get back to you as soon as possible with a response. we're ready to start working on your new project, contact us now to get started.
1. Product Advantages
Forever Seals’ HBY seal ring sets a high standard for hydraulic sealing performance. It handles high pressure, operates at steady speeds, and endures a wide temperature range—from extreme cold in high-altitude areas to heat in industrial workshops. Its composite structure (polyurethane + POM/PA) delivers strong durability: the high-grade polyurethane offers excellent wear resistance, while the integrated backup ring boosts extrusion resistance, preventing deformation even in challenging conditions. This reduces equipment maintenance needs, cutting downtime costs for users. With superior elasticity, it maintains reliable sealing performance long-term, avoiding costly medium leakage that could damage hydraulic parts.
2. Working Principle
The HBY seal ring relies on dual-component synergy to solve two key hydraulic system challenges: leakage and structural stability. When installed in a cylinder, the polyurethane ring—designed with an optimized lip—forms a tight seal against the cylinder inner wall. This lip adapts to minor surface irregularities to block leakage of hydraulic oil, water, gas, or flame-retardant fluids, acting as the primary sealing barrier. The adjacent POM/PA backup ring works as a mechanical support: under pressure, it absorbs forces that would otherwise push the polyurethane ring into the cylinder’s gap. This teamwork keeps the seal intact even during fast piston movement or pressure changes, ensuring consistent sealing efficiency. Unlike single-component seals that fail easily, the HBY balances flexibility (from polyurethane) and rigidity (from POM/PA) for all-condition reliability.
3. Product Details
Material Quality:
Polyurethane: Imported, with ideal Shore hardness to balance elasticity and wear resistance. It’s enhanced with additives to resist UV rays and oil, preventing degradation in harsh media.
POM/PA Backup Ring: High-density POM (for standard models) or reinforced PA (for heavy-duty use) with added strength, ensuring rigidity and impact resistance.
Specifications & Customization:
Standard models cover common cylinder sizes, with a range of inner diameters to fit most hydraulic equipment.
Custom options available: Forever Seals creates tailored sizes based on client cylinder drawings and modifies materials for special needs (e.g., low-temperature environments or chemical-exposed settings).
Craftsmanship & Quality Control:
Precision injection molding ensures consistent size across batches, avoiding installation fit issues.
Post-molding processes include surface polishing (to protect cylinder walls) and immersion testing in hydraulic oil to verify oil resistance.
Every batch undergoes quality checks (pressure cycling, temperature aging, wear testing) to meet ISO 9001 standards.
4. Application Range
The HBY seal ring is versatile for high-demand hydraulic scenarios across industries:
Construction Machinery: Excavators, loaders, and bulldozers—sealing boom, arm, and bucket cylinders that face frequent pressure changes and dust.
Industrial Hydraulics: Press machines, injection molding machines, and hydraulic lifts—handling high-pressure, non-stop operation.
Mobile Hydraulic Equipment: Agricultural machinery (harvesters, tractors), mining trucks, and road rollers—adapting to outdoor mud, vibration, and temperature shifts.
Specialty Applications: Hydraulic systems in cold-chain logistics (freezer trucks) and high-temperature industrial ovens, thanks to its wide temperature adaptability.
It’s perfect for clients wanting a "one-seal-fits-multiple-equipment" solution, reducing inventory costs by replacing multiple specialized seals with the HBY series.
5. FAQ
Q1: How do I choose the right HBY model without detailed cylinder specs?
A1: Provide your equipment brand/model (e.g., "Komatsu PC200 excavator boom cylinder") or the original seal’s part number. Forever Seals’ technical team has a database of common hydraulic cylinder specs to recommend the right model. For custom cylinders, we accept 2D/3D drawings to make tailored seals quickly.
Q2: Do I need special tools to install it, and does wrong installation affect service life?
A2: No special tools are needed—standard seal installation tools work. But incorrect installation (e.g., twisting the seal, using sharp tools that scratch the polyurethane) can shorten service life significantly. We provide a free installation guide (with videos) and 1-on-1 virtual training for bulk buyers to ensure proper fitting.
Q3: Can it be used in hydraulic systems with mixed media (e.g., hydraulic oil + water)?
A3: Yes. The polyurethane resists water-oil emulsions (common in rainy construction conditions), and the backup ring isn’t affected by water. For strong acids/alkalis, we offer a modified HBY variant with chemical-resistant coatings—contact our sales team for details.
Q4: What if the seal fails within the warranty period?
A4: Forever Seals offers a hassle-free warranty: if failure is due to material or craftsmanship defects (not improper use), we’ll replace it for free and cover shipping. Just provide photos of the failed seal, installation details, and your order number—we’ll respond quickly.
6. Company Selling Points (Forever Seals)
As a 10+ year hydraulic seal manufacturer, Forever Seals combines expertise with customer-focused service:
Strict Quality Assurance: Every HBY seal goes through multiple quality checks before shipping, with a much lower defect rate than industry average. We’re ISO 9001 and CE certified, meeting global standards (e.g., EU REACH, US FDA for food-grade use).
Full-Cycle Support: We offer pre-sales technical help (optimizing seal selection), during-sales order tracking (real-time updates via our portal), and post-sales maintenance guidance. Our 24-hour technical hotline (in English, Spanish, German) supports global clients anytime.
Scalability & Customization: We have large monthly production capacity to fulfill bulk orders quickly. For niche industries (e.g., aerospace, marine hydraulics), our experienced R&D team develops custom HBY variants (material or design changes) promptly.
Sustainable Practices: We use eco-friendly polyurethane (no heavy metals) and recycle most production waste, aligning with clients’ green goals. Our seals’ long service life also reduces landfill waste from frequent replacements.
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