Auto Exhaust Valve

The automatic exhaust valve is in the application, sometimes it is damaged, then what is the reason for this happening?
The effect of poor fuel combustion and therefore caused by carbon. Burning is not only caused to rise, but also form junction in the combustion chamber. The rising rises increase the working environment of the exhaust valve more harsh, and exacerbated the burning of the exhaust valve after superimposing other situations. A portion of the junction in the combustion chamber will be discharged as the exhaust gas, which can also be on the sealing surface of the exhaust valve and the valve seat as the previous particles. In particular, the heating temperature of heavy oil is well controlled, and the viscosity is too large to spray the fuel of the cylinder. The combustion caused by the combustion of the high-pressure oil pump plunger wear, which will cause the exhaust valve and the seat seal. The surface is contaminated, and the impurities contained in the fuel have a glass-like glass that is mixed with carbon particles in the exhaust valve disc and the valve seat seal tapered surface after various complex heats contained in the combustion chamber. Crisp material, mixed with sodium sulfate, calcium sulfate, iron oxide, and other substances. When the glass-like deposit deposited thickness, cracking occurs at the impact force at the gas valve close, and it is repeatedly improving to form a high temperature gas ejection passage to burn the valve.