The R28 type seal is a double-acting symmetric compression seal manufactured from high-performance polyurethane (PU) material. It adopts an inner-ring sealing surface design with a symmetrical structure, enabling bidirectional sealing function. The product features strong versatility and can be interchangeably installed in standard O-ring grooves and O-ring back-up ring grooves. It is specially optimized for high-pressure, alternating pressure, large-gap and gas sealing working conditions, and supports ultra-large diameter customization up to 2000mm, widely used in various heavy-duty industrial hydraulic equipment.

Made of high-quality polyurethane (PU) material, it integrates excellent elasticity, compression recovery, abrasion resistance and tear resistance. The material maintains stable sealing performance under long-term high pressure and alternating pressure cycles. It features good gas tightness, outstanding fatigue resistance and durable service life, adapting to complex and changeable industrial working conditions.

• Double-acting Symmetrical Compression Structure: Adopts symmetric double-acting sealing design with the inner ring as the sealing surface, achieving reliable bidirectional sealing effect and stable compression performance.
• Strong Groove Versatility: It can be freely interchanged and installed in standard O-ring grooves and O-ring back-up ring grooves without modifying the groove structure, reducing equipment transformation cost and improving part compatibility.
• Ultra-high Operational Reliability: The integrated symmetrical structure features stable stress distribution, strong pressure impact resistance, and no easy deformation or failure during long-term cyclic operation, ensuring high equipment operation stability.
• Simple and Reliable Installation: The structural design is simple and reasonable, realizing quick and convenient assembly without special tools, effectively improving on-site installation efficiency.
• Easy Storage: The stable integral structure is not easy to deform during storage and transportation, with low storage and maintenance costs and good inventory adaptability.
• Excellent Gas Sealing Performance: It has superior air tightness and can stably seal various gas media, meeting the gas hydraulic hybrid sealing requirements of special equipment.
• Large Gap Adaptability: It can adapt to equipment working conditions with large assembly gaps, effectively solving the sealing failure problem of traditional seals in large-gap scenarios.
• Professional Static Sealing for Cylinder Head Buffer Device: Specially applicable to static sealing of cylinder head end positioning buffer devices, with good fitting performance and reliable sealing effect.
• High Pressure and Alternating Pressure Resistance: It maintains excellent sealing stability under long-term high-pressure operation and frequent alternating pressure impact, with strong working condition adaptability.
• Ultra-large Size Range: Supports customized production of super-large diameters, with a maximum applicable diameter of 2000mm, covering various large-scale hydraulic equipment sealing demands.

Widely used in self-propelled cranes, construction machinery, industrial vehicles, forestry machinery, presses, injection molding machines and power equipment. It is suitable for static sealing, gas sealing, high-pressure sealing and alternating pressure sealing scenarios of various large hydraulic systems.