Cylinder Cover AR Valve for FMC Bean L11 Series (SKU:3267744), forged from API 7K-certified 42CrMo alloy steel, quenched+tempered (HRC 28-32) with surface nitriding, tensile strength ≥1080MPa, 500h salt spray corrosion-free, paired with NBR sealing rings, fits high-pressure mud pumps, API 6A flange compatible
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