Eduction in ship diesel engine valve working conditions is very bad, the air valve base, direct contact with high temperature combustion products during the valve opening is under high temperature (900 ~ 1000 ° C) and corrosive gas high speed (600 m/s) flushing, valve core temperature as high as 700 ~ 800 ° C, in the middle of valve plate and valve stem transition arc temperature is 600 ~ 700 ° C, exhaust valve working temperature distribution as shown in figure 1-1.Too high temperature will reduce the mechanical properties of the metal material, the material thermal deformation.When the valve surface seal is not strict, it will cause high temperature gas to burn the valve surface.When the air valve sits, the valve and the seat inertial force and the spring force under the joint action, also bears the considerable impact alternating load, in the air valve appears to beat or the air valve clearance increases, this kind of load will increase obviously.Valve and seat impact, easy to form sealing surface deformation and serious wear.Because most Marine diesel engines are supercharged diesel engines, the fresh air pressure in the inlet prevents the possibility of obtaining lubricating oil from the air valve duct, so dry friction is easy to occur between metals.However, there is always a layer of lubricating oil between the alloy surface of the valve and the exhaust seat of the supercharged diesel engine.In addition, the stem and the pipe will also occur wear, the top of the stem by rocker arm impact and wear.

Zhenjiang haishun Marine equipment co., ltd. is a professional production and sales of Marine diesel engine parts at home and abroad based on the operation of the company, the perennial employment of university of science and technology internal combustion engine research institute professor Chen daochun as technical director and consultant, to the quality of survival, credibility and development.

The company mainly supplies domestic: China shipping group, cosco group, and the ministry of communications east China sea rescue bureau, south China sea rescue bureau, north sea salvage bureau, maritime bureau and other large vessels and Yangtze river shipping system units, providing quality and convenient Marine diesel engine, Marine diesel engine parts, diesel engine parts services.