376-9017 3769017 Mining-Grade Hydraulic Cylinder Seal Kit for Underground Loaders IT38F IT38G II

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5. FAQ

Q: What core advantages does anti-sulfide NBR have compared with conventional rubber materials?
A: Ordinary rubber will gradually become brittle, crack or lose elasticity after long-term exposure to sulfide gas and constant dampness in underground tunnels. This customized anti-sulfide NBR is blended with special anti-corrosion additives, which can effectively isolate the erosion of sulfide gas and prevent chemical aging. It also maintains excellent oil resistance and low-temperature performance. Even working in dark, humid and gas-filled mine tunnels all year round, it will not swell, harden or degrade easily, delivering long-lasting sealing reliability for static sealing parts.

Q: What performance characteristics make impact-resistant PU the ideal choice for main dynamic seals?
A: Underground loaders frequently collide with ore piles and tunnel walls during operation, bringing continuous impact and variable heavy loads to hydraulic cylinders. This impact-resistant PU material has superb toughness and structural stability. When bearing sudden impact and high pressure, it will not deform or crack. During high-frequency reciprocating motion of cylinder rods and pistons, it always fits closely with matching surfaces, keeping stable sealing tightness. It also resists fatigue deformation after long cycles of movement, ensuring the hydraulic system maintains steady power output all the time.

Q: How do boron-filled PTFE backup rings cooperate with main seals to enhance the overall service life?
A: Pure PTFE has insufficient rigidity under ultra-high hydraulic pressure. After adding boron fillers, its compression resistance, surface hardness and wear resistance are greatly improved. Installed beside the main PU seals, these backup rings fill the gaps of mounting grooves completely. When the loader lifts heavy ore or encounters sudden impact to generate instantaneous pressure peaks, they evenly disperse excess pressure and prevent the sealing lips from being squeezed and damaged. Meanwhile, its superior self-lubricating property reduces running friction between moving parts, lowering wear and heat generation.

Q: What practical functions do compressed fiber guide rings achieve during piston movement?
A: Underground tunnel ground is rugged and uneven, so the piston is often subjected to irregular lateral thrust during operation. The high-compression fiber guide ring can effectively absorb and offset this eccentric force, guiding the piston to move along the central axis stably. It greatly reduces direct metal-to-metal friction between the piston and cylinder wall, cuts down operating noise and slows down the wear of expensive metal components. The compact fiber structure also has good shock absorption, buffering the continuous vibration generated when the loader travels over rough mine roadways.

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