常见气门烧损的原因分析 Analysis of the causes of common valve burnout

扬州海弘柴油发电机组公司分析，最常见的气门烧损究竟是什么原因造成的？

　　气门烧损以排气门最为常见，其基本原因是气门座的扭曲和积炭。此外，如气门间隙调整不当、磨损过度等也能引起气门的烧损。

　　当气门座扭曲时，气门密封面温度及气门与座之间的局部压力同时增加。气门密封面上往往出现沟槽，经高温气体的冲刷便会形成烧损。当气门密封面及气门座积炭严重时，使传热条件恶化，也容易产生变形，导致气门烧损。

Analysis by Yangzhou Haihong Diesel Generator Company: What is the most common cause of valve burnout?

Valve burnout is most common in exhaust valves, and its basic cause is the distortion and carbon buildup of the valve seat. In addition, improper adjustment of valve clearance and excessive wear can also cause valve burnout.

When the valve seat is twisted, the temperature of the valve sealing surface and the local pressure between the valve and the seat increase simultaneously. Groove often appears on the sealing surface of the valve, which can be burned by the flushing of high-temperature gas. When the valve sealing surface and valve seat accumulate carbon severely, it deteriorates the heat transfer conditions and is also prone to deformation, leading to valve burnout.