Dongfeng LoongGine Engine spare parts exhaust valve 10BF11-07012

Built to withstand the extreme high-temperature environment of exhaust systems, this exhaust valve is crafted from 23-8N heat-resistant austenitic stainless steel. This material exhibits exceptional high-temperature strength—tensile strength of 950MPa at 800℃—maintaining structural integrity under continuous operating temperatures up to 850℃ (peak temperatures reach 1000℃ during heavy load). The valve undergoes a specialized heat treatment process (solution annealing + precipitation hardening) to enhance creep resistance, preventing deformation even after 100,000 hours of exposure to high-temperature exhaust gases. A plasma-sprayed stellite alloy coating (1.5mm thickness) on the valve head further improves heat resistance, extending service life by 50% compared to uncoated valves

The exhaust valve features a high-precision structure designed to maximize exhaust efficiency and sealing performance. The valve head adopts a streamlined contour with a thin edge (1.5mm) to reduce exhaust flow resistance by 35%, accelerating exhaust gas discharge and improving engine volumetric efficiency by 8%. The valve stem undergoes ultra-precision grinding with a surface roughness of Ra ≤0.1μm, ensuring smooth movement in the valve guide and minimizing oil consumption (reduced by 20%). The valve seat face is lapped to a mirror finish (Ra ≤0.05μm), forming a tight seal with the cylinder head—leakage rate is tested to ≤3mL/min at 0.3MPa, preventing exhaust gas backflow and power loss

Optimized to resist wear and corrosion from aggressive exhaust gases, the valve integrates multiple protective features. The stellite alloy coating on the valve head resists abrasive wear from carbon deposits and ash particles, reducing seat face wear by 60%. The 23-8N stainless steel material is inert to chemical corrosion from acidic exhaust by-products (e.g., sulfur dioxide), preventing pitting and rust. The valve stem’s top end is equipped with a hardened chrome-plated cap (HRC 60-65) that withstands repeated impacts from the valve lifter, avoiding indentation and ensuring stable valve timing. These features ensure reliable performance in dusty construction sites or high-sulfur fuel applications

The exhaust valve directly contributes to enhancing engine performance and meeting emission standards. Its optimized design ensures rapid exhaust gas evacuation, reducing exhaust backpressure by 40% and increasing engine power output by 5-7% (e.g., raising DD11 engine power from 430hp to 455hp). The tight sealing performance prevents exhaust gas backflow into the cylinder, improving combustion efficiency and reducing fuel consumption by 3-4%. Additionally, the valve’s stable operation ensures precise control of the exhaust stroke, supporting the SCR (Selective Catalytic Reduction) system to reduce NOx emissions by 95%, meeting China’s National VI and Euro VI emission standards. Backed by a 2-year/200,000km warranty, it provides a cost-effective solution for maintaining engine performance and compliance