automatic exhaust valve in use process, sometimes easy to burn, which is the main reason of the what?

1, poor fuel combustion, and therefore the carbon impact.

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 Industrial Valves. Carbon there will be a part of the combustion chamber with the 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 this vitreous sediment deposition thickness is too big, will happen under the impact force of the valve closed crack, flake and then develop into, after repeated impact to form high temperature gas jet channel valve burning.

2, contained in fuel oil combustion particles of impurities.

when into the combustion chamber of the oil mixed with burning impurity particles, the impurity particles with exhaust cylinder, in the process of discharge will be a chance in the exhaust valve closed stuck resistance in the exhaust valve and valve seat sealing surface. Cause the exhaust Industrial Valves cannot be completely shut down, how big is the diameter of the pellet impurity in this stuck, big of valve's opening. Although can through the injector orifice into the combustion chamber of the impurity particles are smaller, but in the mixed fuel combustion gas explosion, the explosion of the combustion chamber pressure is high, the tiny air valve opening can also cause high temperature and high pressure combustion gas channeling out. This time through the combustion gas temperature is very high, instantaneous peak of close to 2000 ℃, far higher than in the exhaust stroke through the exhaust valve sealing surface of the exhaust gas temperature. Exhaust valve sealing surface of the material can withstand normal exhaust fumes scour, but cannot afford such a high pressure and high temperature combustion gas flushing, a short period of time can cause burning of the exhaust valve. Especially valve is stuck in heavy oil of alumina and silica these extremely hard particles, at the same time of exhaust valve closed due to dense, common exhaust valve seal cone in the working temperature is not high hardness, deposition of hard particles combustion products under the impact of the closing valve, still can make particles embedded sealing surface, and under the high temperature gas scour and ablation in pit, pit throughout after sealing surface to form a flat and burning air valve.

3, fuel containing vanadium, such as sodium easy cause high temperature corrosion of metal elements.

now in general use in the shipping market of inferior fuel oil contains a large amount of vanadium, sodium and sulfur and other elements. In the process of burning sulfur, sodium and vanadium element such as the formation of sulfur oxide, sodium oxide and vanadium pentoxide ( The chemical composition of oxide depends on excess oxygen and temperature) 。 To occur between oxide reaction, but also react with calcium in lubricating oil, the formation of low melting point of salt and sodium sulfate, calcium sulfate with different composition of sodium vanadate, etc. These salts mixture melting point is 535 commonly & deg; C, at the same time with strong corrosion resistance. When the temperature of the parts in 550 & deg; C above, enough to make vanadium and sodium content in the molten state, attached to the surface of parts. When the exhaust valve in working, for various reasons make the valve temperature of 550 & deg; C above, to make it in a liquid form deposits on the valve plate and valve seat and valve stem and valve of the transition surface. Then even very hard alloy steel from corrosion, corrosion resistant corrosion as a result, form a pit on the seal cone, potholes are linked together through the sealing surface can cause air leakage after burning air valve. Especially the air valve and valve seat sealing surface appears after the pitting described earlier, easy to deposit corrosion solution, more to speed up the formation of pits. Due to the corrosion was produced under the condition of high temperature, so called & other; High temperature corrosion & throughout; 。 In the high temperature corrosion of harmful elements in the dangers of vanadium is the largest.

4, the rotary valve valve failure.

burning heavy oil of four stroke diesel engine in order to reduce the above 1, 2, 3, the reason of the influence of the air valve life, design the rotating mechanism of exhaust valve. Make every switch the exhaust valve automatically rotate an Angle, to remove the card in the sealing surface of the particles and carbon, avoid the particles and the accumulation of carbon in the exhaust valve sealing surface. If the exhaust Industrial Valves of rotary valve failure, can't keep the vent valve in the work constantly turning, or rotate with the closing of the valve stroke, will soon make the exhaust valve burning, greatly shorten the service life of the exhaust valve.

5, the quality problem of the valve.

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