The R30 type seal is a two-piece combined seal composed of a PTFE special-shaped cross-section slip ring and a nitrile rubber (NBR) preload spring ring. Combining the low friction and wear resistance of PTFE with the excellent elastic preload performance of NBR rubber, this structure is specially optimized for large-diameter and heavy-load hydraulic working conditions. It provides stable and reliable long-term sealing performance under high-pressure and heavy-duty operating environments.

• PTFE (Polytetrafluoroethylene): Features ultra-low friction coefficient, excellent wear resistance, high pressure resistance and outstanding extrusion resistance. It realizes smooth sliding operation without stick-slip phenomenon, ensuring stable dynamic sealing for a long time.
• NBR (Nitrile Butadiene Rubber): Acts as a preloading elastic element. It provides continuous and uniform contact pressure through its special cross-section design, compensates for assembly gaps and pressure changes, and maintains close fitting of the PTFE slip ring to achieve zero-leakage sealing.

• Two-piece Combined Structure: Consists of a PTFE special-shaped cross-section slip ring and an NBR rubber preload ring. The rigid and flexible composite structure gives full play to the advantages of both materials, achieving higher sealing stability than single-material seals.
• Suitable for Large-diameter & Heavy-load Working Conditions: The optimized composite structure perfectly adapts to large-diameter cylinder installation and heavy-load operation scenarios, solving the problems of insufficient rigidity and poor pressure resistance of conventional seals under heavy loads.
• Ultra-high Pressure Resistance: The product has excellent pressure-bearing capacity, which can withstand long-term high-pressure impact in hydraulic systems and maintain stable sealing state without deformation or failure.
• Excellent Extrusion Resistance: The high-rigidity PTFE slip ring effectively resists high-pressure extrusion, prevents seal deformation and gap extrusion damage, and adapts to high-pressure and large-gap working conditions.
• Anti-twist Design during Installation: Adopts optimized structural anti-twist design to effectively avoid seal distortion, twisting and dislocation during assembly, greatly improving installation yield and on-site applicability.
• High Stable Contact Pressure: The special cross-section design of the NBR rubber ring provides continuous and uniform high contact pressure on the sealing surface, ensuring reliable sealing performance under low pressure, high pressure and variable load conditions.
• High Wear Resistance & Low Friction: The PTFE sliding ring has ultra-low friction and excellent wear resistance, reducing cylinder operating resistance, lowering equipment wear and extending the service life of hydraulic components.
• No Stick-slip Phenomenon: Excellent self-lubricating performance ensures smooth reciprocating movement of the piston rod, no jitter or stick-slip, improving the stability and precision of equipment operation.

Widely used for piston and piston rod sealing of large-diameter hydraulic cylinders, heavy-duty hydraulic equipment, engineering machinery and metallurgical hydraulic systems, especially suitable for high-pressure, heavy-load and long-term continuous operating working conditions.