The P33 type seal is a high-performance combined piston seal consisting of a PTFE rectangular cross-section slip ring and an NBR rectangular loading ring. It is specially developed for the hydraulic cylinder piston sealing system of heavy machinery and metallurgical equipment. The seal is applicable to double-sided pressure-bearing piston working conditions, especially suitable for large-diameter piston applications. With composite material advantages of low friction, high pressure resistance and excellent thermal conductivity, it delivers stable and long-lasting sealing performance under heavy-duty and harsh cyclic working conditions.

• PTFE (Polytetrafluoroethylene): Features high pressure resistance, outstanding extrusion resistance and excellent wear resistance. It provides low friction coefficient and good thermal conductivity, ensuring smooth piston movement without hydraulic crawling, greatly improving the stability and service life of dynamic sealing.
• NBR (Nitrile Butadiene Rubber): Acts as a special-shaped elastic loading element. It generates high and uniform sealing contact pressure, effectively compensating for assembly gaps and pressure fluctuations to achieve reliable zero-leakage sealing under variable load conditions.

• Double-sided Pressure Bearing Piston Seal: Designed for piston sealing with pressure on both sides, it perfectly adapts to bidirectional alternating pressure working conditions and solves the leakage problem caused by frequent pressure switching of large-diameter pistons.
• Excellent Large-diameter Piston Adaptability: The optimized rectangular composite structure has strong structural rigidity and stability, specifically suitable for large-diameter piston hydraulic cylinders that are prone to deformation and poor sealing under heavy loads.
• Ultra-high Pressure Resistance: The rigid PTFE main body cooperates with the elastic rubber support to withstand long-term high-pressure impact, providing stable pressure-bearing capacity for heavy-duty hydraulic systems.
• Built-in Anti-twist Structure: The structural optimization effectively prevents twisting, distortion and dislocation during installation and reciprocating operation, improving assembly efficiency and long-term operational reliability.
• Superior Anti-extrusion Performance: High-rigidity PTFE slip ring effectively resists high-pressure extrusion and gap squeezing damage, adapting to high-pressure and large-gap harsh working conditions.
• Good Wear Resistance & Thermal Conductivity: The PTFE material minimizes friction wear during continuous operation; excellent thermal conductivity quickly dissipates frictional heat, avoiding high-temperature aging and prolonging seal service life.
• Low Friction & No Hydraulic Crawling: Ultra-low friction and self-lubricating properties ensure smooth reciprocating movement of the piston, eliminating jitter, crawling and sticking problems, and improving equipment operation accuracy.
• High Sealing Contact Pressure: Equipped with a special-shaped rubber loading ring, it provides continuous and high sealing contact pressure, ensuring stable and reliable sealing effect under low pressure, high pressure and variable load working conditions.

Widely applied in 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 heavy-duty and large-diameter piston sealing equipment.