Dongfeng LoongGine Engine parts Exhaust gas bypass valve outlet connection pipe assembly 1145535-E9E00

Crafted from heat-resistant 409 stainless steel, this connection pipe assembly excels in withstanding the extreme temperatures (up to 800°C) of engine exhaust gases—far exceeding the performance of ordinary carbon steel pipes. The 409 stainless steel material features a chromium-rich oxide layer that provides exceptional resistance to corrosion from exhaust byproducts (such as sulfur dioxide and water vapor), preventing rust, pitting, or pipe wall thinning over time. Additionally, the pipe undergoes a high-temperature annealing process to enhance its structural stability, ensuring it does not deform or crack even under prolonged exposure to thermal cycles (e.g., engine startup and shutdown). Through 2000+ hours of simulated exhaust environment testing, the pipe maintains its original shape and integrity, meeting the long service life requirements of Dongfeng LoongGine engines.

Engineered with a multi-layer sealing structure, the 1145535-E9E00 connection pipe assembly guarantees airtightness between the exhaust gas bypass valve and the downstream exhaust system. The pipe’s flange is precision-machined to a smooth surface finish (Ra ≤ 1.6μm) to ensure full contact with the bypass valve’s outlet flange. A high-temperature resistant graphite gasket (included with the assembly) is placed between the flanges, providing a reliable seal that withstands extreme heat without hardening or deteriorating. Furthermore, the pipe’s welding joints (where applicable) are subjected to ultrasonic testing to detect hidden defects, ensuring no exhaust gas leaks—leaks that could reduce engine efficiency, increase emissions, or cause damage to nearby components. This leak-proof design directly contributes to the engine’s compliance with emission standards (e.g., China’s National VI Emission Standard)

The internal flow path of the connection pipe is carefully designed using computational fluid dynamics (CFD) simulations to minimize exhaust gas resistance and ensure smooth flow from the bypass valve to the exhaust system. The pipe features a gradual bend radius (avoiding sharp angles) and a consistent inner diameter, which reduces pressure drops and turbulence—critical for maintaining the bypass valve’s proper operation. By optimizing exhaust flow, the assembly helps the bypass valve effectively regulate exhaust gas recirculation (EGR) or turbocharger boost pressure, depending on the engine’s operating conditions. This, in turn, improves the engine’s fuel efficiency (reducing fuel consumption by up to 3% in typical operating scenarios) and reduces harmful emissions (such as nitrogen oxides). In high-load engine operations (e.g., heavy hauling), the optimized flow path prevents exhaust backpressure buildup, ensuring the engine maintains optimal power output

Designed for user-friendly installation, the 1145535-E9E00 connection pipe assembly comes with pre-drilled flange holes and matching high-strength bolts (made of heat-resistant alloy steel) that fit the original engine’s mounting points. Technicians can install the pipe using standard hand tools (no specialized equipment needed), with clear alignment marks on the flange to ensure correct positioning. The entire installation process takes approximately 45 minutes, minimizing vehicle downtime. Additionally, the pipe’s 409 stainless steel construction requires minimal maintenance: regular visual inspections (to check for loose bolts or external damage) are sufficient, as the material’s corrosion resistance eliminates the need for frequent cleaning or anti-rust treatments. Unlike carbon steel pipes that require periodic painting or replacement, this assembly maintains its performance with minimal upkeep, lowering long-term maintenance costs for vehicle owners or fleet managers