4-stroke medium-speed machines in use process, the exhaust valve is damaged would happen, so what is the cause of this situation? Follow the below small make up together to get to know.

bad combustion will not only cause the high exhaust temperature, but also formed in the combustion chamber carbon. High exhaust temperature of exhaust valve working environment worse, overlay other situation has intensified after loss of exhaust valve.

carbon will be a part of the combustion chamber with waste gas discharge, it will be like said in front of the particles in exhaust valve and valve seat sealing surface. Especially heavy oil heating temperature control, and the viscosity is too large to cause injection cylinder fuel atomization, high pressure oil pump plunger wear caused by the burning back and other causes of bad combustion, can make the exhaust valve and valve seat sealing surface are contaminated with carbon deposit, plus impurities contained in the fuel oil after all sorts of complex thermal processes of the combustion chamber, the exhaust valve valve plate and valve seat seal cone deposit into a mixed with carbon particle layer of vitreous hard brittle material, its mixed with sodium sulfate, calcium sulfate, ferric oxide, etc.

when the vitreous sediment deposition thickness is too big, the crack will happen under the impact force of the valve closed, after the repeated impact, in turn, develop into flake, forming a high temperature gas jet channel make the valve burning.

at the above content, believe everybody already knows the cause of exhaust valve damage.

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