High-Pressure Cup Seal for Hydraulic Rock Drills This cup seal is engineered to prevent fluid leakage in hydraulic rock drill cylinders, ensuring efficient pressure retention in high-vibration mining operations. Constructed from nitrile rubber (NBR 70 Shore A) with fabric reinforcement, it combines flexibility for dynamic sealing with resistance to hydraulic fluids and abrasion.
Key Performance Attributes
Material & Durability:
Nitrile rubber (NBR) offers excellent resistance to mineral oils, greases, and water-glycol fluids—common in rock drill hydraulic systems. The 70 Shore A hardness balances sealing contact pressure and flexibility, maintaining integrity under repeated piston movement .
Fabric reinforcement (polyester mesh) enhances tensile strength by 30% compared to non-reinforced seals, preventing tearing under 40MPa pressure surges .
Sealing & Precision:
The single-lip design creates a tight seal against cylinder walls, validated through 10,000-cycle leak testing (ISO 18797) with zero measurable fluid loss. IT9 tolerance ensures consistent fit across production batches, reducing installation errors .
Operational Reliability:
Rated for 50,000 cycles under standard conditions, it withstands the repetitive motion of hydraulic pistons. The -30°C to +100°C temperature range ensures performance stability in cold underground mines and high-friction zones where heat buildup occurs .
Applications
Hydraulic Rock Drills: Critical for sealing piston chambers in drill cylinders, preventing pressure loss.
Mining Equipment: Compatible with tunneling machines, quarry drills, and exploration rigs requiring high-pressure hydraulic seals.
