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Improper materials, improper installation, bad use and maintenance and other factors caused by the so-called natural damage, refers to the valve wear under normal working conditions, the media on the exhaust valve sealing surface can not prevent corrosion and erosion damage Such as these can not resolutely prevent the damage is called natural damage damage caused by the reasons can be attributed to the following: 1. Exhaust valve sealing surface processing quality is not good: the main appearance of the exhaust valve sealing surface cracks, pores and Ballast and other defects, due to improper selection of welding and heat treatment standards, and welding and heat treatment caused by poor operation, the valve sealing surface is too high or too low, due to improper material or heat treatment caused by improper, Exhaust valve sealing surface hardness uneven, corrosion-resistant, mainly due to the process of surfacing the underlying metal blowing to the top, diluting the valve sealing surface alloy composition cited by the. There are also design problems. . Improper selection and poor operation caused by the damage: the main appearance in the absence of conditions according to the conditions of the valve, the cut-off valve when the throttle valve is used to close the pressure is too large and shut too close or lax, so that The valve sealing surface has been erosion and wear 3. Improper installation and repair ineffective cause exhaust valve sealing surface is not working properly, the valve sick operation, premature damage to the exhaust valve sealing surface 4. The chemical corrosion of the media: Exhaust valve sealing surface around the media, in the absence of current conditions, the media directly with the exhaust valve sealing surface chemical role, rotting the exhaust valve sealing surface. 5. Electrochemical learning corrosion: exhaust valve sealing surface mutual Contact, exhaust valve sealing surface and the closure and valve body contact, as well as the concentration of the media, oxygen concentration and other reasons, will have a potential difference, the onset of electrochemical corrosion, the valve anode sealing surface is corroded.
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