Professional O-Ring and Oil Seal Manufacturer, Sealing Solution Supplier Since 2008.
IDI-Style PU Piston Rod Seal – Ideal for Hydraulic Cylinders in Heavy Machinery
Reliable Sealing Solutions for Construction, Injection Molding, Marine & Mining Hydraulic Equipment
Engineered for hydraulic cylinders, the IDI piston rod PU seal blends strength and reliability. Its polyurethane build resists wear, while the IDI structure delivers broad pressure/temperature adaptability (-35℃~110℃, up to 35MPa). It stops leaks effectively, works with anti-extrusion rings, and fits industries like marine and mining. This seal boosts system efficiency, reduces downtime from failures, and lowers long-term costs. For anyone needing durable, high-performing hydraulic sealing, it checks key boxes: durability, leak prevention, and versatility—simplifying fast, informed purchasing choices.
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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
Superior Durability: Crafted from high-grade polyurethane (PU), the seal resists wear, abrasion, and hydraulic fluid corrosion, ensuring a longer service life than standard seals—reducing frequent replacement costs for users.
Broad Environmental Adaptability: Operates stably in temperatures ranging from -35℃ to 110℃ and handles pressures up to 35MPa (40MPa for customized versions), adapting to harsh industrial conditions without performance loss.
Reliable Leak Prevention: The U-shaped dual-lip design creates a double sealing barrier, while compatibility with backup rings (PTFE or polyamide) prevents extrusion under high pressure, eliminating internal/external leaks.
Low Maintenance: Minimal friction between the seal and piston rod reduces hydraulic system wear, lowering maintenance frequency and downtime for equipment.
2. Working Principle
The IDI-type seal is installed in the piston rod groove of hydraulic cylinders. When the cylinder operates, hydraulic pressure pushes the seal’s inner and outer lips tightly against the rod and cylinder bore, forming an initial sealing interface. The U-shaped structure distributes pressure evenly across the lips, avoiding local stress concentration. Backup rings support the seal to prevent deformation or extrusion under high pressure. As the piston rod reciprocates, the PU material’s elasticity maintains consistent contact with the rod, ensuring continuous leakage prevention and stable hydraulic flow.
3. Product Details
Material: High-performance polyurethane (PU) with enhanced tensile strength and elasticity.
Structure: U-shaped cross-section with dual lips (inner lip for rod sealing, outer lip for bore sealing) and precision-machined edges for tight fitting.
Dimensions: Available in standard and customized sizes to match various piston rod diameters (5mm–300mm) and cylinder groove specifications.
Certifications: Compliant with ISO 9001 quality standards and RoHS environmental requirements.
4. Application Range
Ideal for hydraulic systems in multiple industries, including:
Construction Machinery: Excavator hydraulic cylinders, loader steering systems.
Plastic Machinery: Injection molding machine screw seals, hydraulic clamping units.
Marine & Mining: Ship ballast system cylinders, mining crusher hydraulic components.
General Industry: Hydraulic pumps, presses, and automated production line hydraulic actuators.
5. FAQ
Q1: Can this seal be used with different hydraulic fluids?
A1: Yes, it is compatible with most mineral-based hydraulic oils, water-glycol fluids, and synthetic hydraulic fluids (contact our team for fluid-specific recommendations).
Q2: How to choose the right size for my equipment?
A2: Provide piston rod diameter, cylinder bore diameter, and groove width/depth—our engineering team will recommend the exact size or customize it.
Q3: What is the typical service life of this seal?
A3: Under normal operating conditions (proper installation, suitable fluid, and temperature/pressure within range), it can last 2,000–5,000 working hours.
6. Company Selling Points (Forever Seals)
15+ Years of Expertise: Specialized in hydraulic seal R&D and manufacturing, with deep knowledge of industrial sealing needs.
Customization Capability: Offers tailor-made solutions for non-standard equipment, with fast prototyping (7–10 days) and mass production.
Global Support: Provides 24/7 technical consultation, on-site installation guidance, and after-sales service in over 50 countries.
Quality Assurance: Each seal undergoes pressure testing, dimensional inspection, and wear resistance testing before delivery—zero-defect guarantee.
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