Dongfeng LoongGine Engine spare parts intake valve 10BF11-07011

Built as a critical component of the engine’s air intake system, this intake valve features a high-precision structure to optimize airflow and sealing performance. The valve head adopts a streamlined umbrella-shaped design, reducing airflow resistance by 30% compared to traditional flat-head valves—maximizing air intake volume (up to 180L/min per cylinder) and improving engine volumetric efficiency by 8-10%. The valve stem undergoes grinding with a surface roughness of Ra ≤0.2μm, ensuring smooth movement in the valve guide and minimizing oil consumption. The valve seat face is precision-lapped to a mirror finish, forming a tight seal with the cylinder head (leakage rate ≤5mL/min at 0.3MPa), preventing compressed air leakage and power loss

Engineered to endure the harsh high-temperature environment of the cylinder head, the intake valve is crafted from 21-4N heat-resistant martensitic stainless steel. This material exhibits a tensile strength of 1100MPa and a yield strength of ≥850MPa, maintaining structural integrity at continuous operating temperatures up to 650℃—resisting deformation even under extreme combustion conditions. The valve undergoes a two-step heat treatment process (solution annealing + tempering) to enhance its high-temperature fatigue resistance, ensuring no cracking or warping after 100,000 thermal cycles (from 20℃ to 650℃). The surface is coated with a CrN (chromium nitride) layer, improving wear resistance by 50% and extending service life to ≥300,000km

Optimized to withstand wear and corrosion from intake air contaminants and engine oil, the valve integrates multiple protective features. The CrN coating on the valve stem and seat face resists abrasive wear from dust and carbon deposits, reducing valve guide wear by 40%. The 21-4N stainless steel material is inert to chemical corrosion from exhaust gas residuals and moisture in the intake air, preventing rust and pitting. The valve stem’s top end is equipped with a hardened steel cap (HRC 55-60) that withstands repeated impacts from the valve lifter, avoiding indentation and ensuring stable valve timing. These features ensure reliable performance in dusty construction or coastal high-humidity environments

The intake valve directly contributes to optimizing engine performance by improving air-fuel mixing and combustion efficiency. Its streamlined design and precise valve timing (controlled by the camshaft) ensure maximum air intake during the intake stroke, increasing the engine’s power output by 5-7% (e.g., raising DD13 engine power from 460hp to 485hp). The tight sealing performance prevents compressed air leakage, improving combustion efficiency and reducing fuel consumption by 3-4%—saving 1.5-2L of fuel per 100km for long-haul trucks. Additionally, the valve’s stable operation reduces vibration and noise in the valve train, enhancing driving comfort. Backed by a 2-year/200,000km warranty, it provides a cost-effective solution for maintaining engine performance