High-Flexibility Diaphragm for Hydraulic Rock Drills This diaphragm is engineered to regulate fluid pressure in hydraulic rock drill control valves, ensuring precise actuation and leak-free operation in high-vibration mining environments. Constructed from NBR rubber with polyester fabric reinforcement, it combines flexibility for dynamic movement with resistance to hydraulic fluids and abrasion.
Key Performance Attributes
Material & Durability:
NBR rubber (nitrile butadiene rubber) offers excellent resistance to mineral oils and greases, maintaining elasticity even after prolonged exposure to hydraulic fluids. The 65 Shore A hardness balances flexibility and structural integrity, critical for repeated expansion and contraction cycles .
Polyester fabric reinforcement enhances tensile strength by 35% compared to non-reinforced diaphragms, preventing tearing under 12MPa pressure surges common in rock drill systems .
Sealing & Functionality:
The diaphragm’s molded edge ensures a tight seal against valve housings, validated through 10,000-cycle leak testing (ISO 18797) with zero measurable fluid loss. IT11 tolerance guarantees consistent fit across production batches, reducing assembly variability .
Operational Reliability:
Rated for 80,000 cycles under standard conditions, it withstands the repetitive motion of valve actuation. The -30°C to +100°C temperature range ensures performance stability in cold underground mines and high-heat zones near drill motors .
Compatible with water-glycol fluids, it maintains sealing performance in systems where fire resistance is required, meeting industry safety standards for mining equipment.
Applications
Hydraulic Rock Drills: Essential for pressure regulation in control valves, pilot-operated cylinders, and fluid reservoirs.
Mining Equipment: Suitable for tunneling machines, quarry drills, and exploration rigs requiring flexible hydraulic diaphragms.
