前言 我厂制造的发动机是国内目前生产功率较大的一种非增压的强化柴油机。由于采用了W型燃烧室,提高了柴油机工作的平均有效压力,改善了柴油机的燃烧过程,因此,相应地也增加了柴油机排气阀和排气阀坐的热负荷。而排气阀坐是控制柴油机排气气道 Foreword The engine that our factory makes is a non-supercharged and intensified diesel engine with large power in China. As a result of the W-type combustion chamber, the average effective pressure of the diesel engine is improved and the combustion process of the diesel engine is improved. Therefore, the thermal load of the diesel exhaust valve and the exhaust valve is correspondingly increased. The exhaust valve seat is to control the exhaust duct of the diesel engine