During the use of the micro exhaust valve, the Foot Valve micro exhaust valve may be damaged. So what is the reason for this situation? Poor combustion will not only increase the exhaust temperature, but also form carbon deposits in the combustion chamber. The increase in exhaust temperature makes the working environment of the exhaust valve worse. After other conditions are increased, the combustion loss of the exhaust valve increases. Some carbon deposits in the combustion chamber will be discharged with the exhaust gas, and will stick to the sealing surface of the exhaust valve and valve seat like the above-mentioned particles.

In particular, the heating temperature of heavy oil is not well controlled, and the viscosity is too high, which makes it difficult to atomize the fuel injected into the cylinder, and the high pressure oil pump plunger wears and other reasons cause combustion regression, which will cause the exhaust valve and valve seat sealing surface to be polluted by carbon deposit . In addition, after various complicated heat treatments in the combustion chamber, the impurities contained in the fuel are deposited on the surface of the exhaust valve flap and the sealing cone of the valve seat into a layer of glassy hard and brittle material mixed with carbon particles, including sodium sulfate and calcium sulfate.

Iron oxide and other substances are mixed together. When the deposition thickness of this layer of glassy deposits is too large, cracks will appear under the action of impact force when the valve is closed. After repeated impacts, it will develop into a sheet shape, thereby forming a high-temperature gas jet channel combustion valve. Poor combustion will not only increase the exhaust temperature, but also form carbon deposits in the combustion chamber. As the exhaust temperature increases, the working environment of the exhaust valve becomes worse. As other conditions increase, the combustion loss of the exhaust valve increases. 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-mentioned 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, the piston of the high-pressure oil pump is worn, and the combustion is reversed, which will cause carbon pollution of the exhaust valve and valve seat sealing area. In addition, after various complicated heat treatments in the combustion chamber, the impurities in the fuel are deposited in a layer of glass-like hard and brittle material on the sealing cone of the exhaust valve flap and valve seat, and are combined with sodium sulfate, calcium sulfate, iron oxide, etc. A mixture of carbon particles. When the deposition thickness of this layer of glassy deposit is too large, when the valve is closed, cracks will appear under the action of the impact force. After repeated impacts, it will develop into a sheet shape, thereby forming a high-temperature gas jet channel combustion valve.