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.燃燒不良不僅會提高排氣溫度，還會在燃燒室內形成積碳。隨著排氣溫度的升高，排氣閥的工作環境變差。隨著其它條件的增加，排氣門的燃燒損失增大。

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.燃燒室內的一些積碳會隨廢氣排出，并像上述顆粒一樣粘在排氣門和閥座的密封面上。特別是重油加熱溫度控制不好，粘度過大，噴射到氣缸內的燃油難以霧化，高壓油泵活塞磨損，導致燃燒倒退，會造成排氣門和閥座密封面積碳污染。此外，在燃燒室內經過各種復雜的熱處理后，燃油中的雜質沉積在排氣閥瓣和閥座密封錐面上的一層玻璃狀硬脆材料中，與硫酸鈉、硫酸鈣、氧化鐵等碳顆粒混合物質。

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.當這層玻璃狀沉積物的沉積厚度過大時，當閥門關閉時，在沖擊力作用下會出現裂紋。經過反復沖擊，會發展成片狀，從而形成高溫燃氣射流通道燃燒閥。

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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