When many people use the micro exhaust valve, they have encountered the damage of the micro exhaust valve. What is the reason for this situation?

1.燃烧不良不仅会提高排气温度，还会在燃烧室内形成积碳。随着排气温度的升高，排气阀的工作环境变差。随着其它条件的增加，排气门的燃烧损失增大。

1. Poor combustion will not only increase the exhaust temperature, but also form carbon deposition in the combustion chamber. With the increase of exhaust temperature, the working environment of exhaust valve becomes worse. With the increase of other conditions, the combustion loss of exhaust valve increases.

2.燃烧室内的一些积碳会随废气排出，并像上述颗粒一样粘在排气门和阀座的密封面上。特别是重油加热温度控制不好，粘度过大，喷射到气缸内的燃油难以雾化，高压油泵活塞磨损，导致燃烧倒退，会造成排气门和阀座密封面积碳污染。此外，在燃烧室内经过各种复杂的热处理后，燃油中的杂质沉积在排气阀瓣和阀座密封锥面上的一层玻璃状硬脆材料中，与硫酸钠、硫酸钙、氧化铁等碳颗粒混合物质。

2. Some carbon deposits in the combustion chamber will be discharged with the exhaust gas and stick to the sealing surface of the exhaust valve and valve seat like the above particles. In particular, the heating temperature of heavy oil is not well controlled, the viscosity is too high, the fuel injected into the cylinder is difficult to atomize, and the piston of high-pressure oil pump is worn, resulting in backward combustion, which will cause carbon pollution in the sealing area of exhaust valve and valve seat. In addition, after various complex heat treatments in the combustion chamber, the impurities in the fuel are deposited in a layer of glass hard and brittle materials on the sealing cone of the exhaust valve disc and valve seat, and mixed with carbon particles such as sodium sulfate, calcium sulfate and iron oxide.

3.当这层玻璃状沉积物的沉积厚度过大时，当阀门关闭时，在冲击力作用下会出现裂纹。经过反复冲击，会发展成片状，从而形成高温燃气射流通道燃烧阀。

3. When the deposition thickness of this layer of glassy sediment is too large, cracks will appear under the action of impact force when the valve is closed. After repeated impact, it will develop into flakes, thus forming the combustion valve of high-temperature gas jet channel.

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