The R29 type seal is a high-performance combined seal ring composed of a PTFE rectangular cross-section slip ring and an NBR rectangular loading ring. It is specially designed for piston sealing systems of hydraulic cylinders in heavy machinery and metallurgical equipment. Featuring a professional composite structure, this seal is dedicated to two-way pressure-bearing piston sealing applications, especially suitable for large-diameter piston working conditions, delivering stable and durable sealing performance under heavy-duty and high-pressure environments.

• PTFE (Polytetrafluoroethylene): Possesses excellent pressure resistance, extrusion resistance and wear resistance, with low friction coefficient and good thermal conductivity. The material runs smoothly without crawling, ensuring long-term stable dynamic sealing of the piston.
• NBR (Nitrile Butadiene Rubber): Serves as the core loading and preloading element. The special-shaped rubber structure provides high and uniform sealing contact pressure, effectively compensating for assembly gaps and pressure changes to achieve zero-leakage sealing.

• Two-way Pressure Bearing Design: It is a professional piston seal applicable to bilateral pressure working conditions, perfectly adapting to the bidirectional pressure alternating operation of hydraulic cylinder pistons, with strong pressure impact resistance.
• Excellent Adaptability for Large-diameter Pistons: The optimized composite structure solves the sealing pain points of large-diameter piston equipment, with stable structure and no deformation under large-size and heavy-load working conditions.
• Ultra-high Pressure Resistance: The integrated structural design enables outstanding high-pressure bearing capacity, which can withstand long-term high-pressure operation and frequent pressure impact in heavy-duty hydraulic systems.
• Built-in Anti-twist Structure: Adopts professional structural anti-twist design to prevent the seal ring from twisting and deforming during installation and reciprocating operation, improving installation efficiency and service stability.
• Superior Extrusion Resistance: The high-rigidity PTFE slip ring cooperates with the elastic rubber ring to effectively resist high-pressure extrusion, avoid gap extrusion damage, and adapt to harsh high-pressure working conditions.
• Good Wear Resistance & Thermal Conductivity: The PTFE material has excellent wear resistance to reduce friction loss; its good thermal conductivity can timely export friction heat, avoid high-temperature aging of the seal and prolong service life.
• Low Friction & No Hydraulic Crawling: Ultra-low friction coefficient and superior self-lubricating performance ensure smooth piston operation, effectively eliminate hydraulic crawling and jitter, and improve equipment operation accuracy.
• High Sealing Contact Pressure: Equipped with a special-shaped rubber loading ring, it can provide continuous and high sealing contact pressure, ensuring reliable sealing effect under low pressure, high pressure and variable load conditions.

Widely applicable to injection molding machines, hydraulic presses, marine hydraulic systems, manipulators, grinding machines, metallurgical machinery and large-scale hydraulic cylinders. It is the preferred sealing solution for piston sealing of heavy-duty and large-diameter hydraulic equipment.