The damage causes of the valve sealing surface is divided into two kinds of man-made damage and natural damage. The damage, usually because of poor design, manufacturing is not fine, improper selection, installation is not correct, use and maintenance services do not cause bad factors, and natural damage refers to the valve in the normal work wear under the condition of medium on the sealing surface is damaged inevitably caused by corrosion and condition, can be summed up the causes of damage to the sealing surface, can be summarized as following:
1, sealing surface processing quality is not good. Mainly there are cracks in the sealing surface, porosity and slag and other defects, the sealing surface hardness is too high or too low, is not due to improper material or heat treatment; uneven sealing surface hardness, corrosion, is mainly due to the welding process in metal bottom blown to the above, dilute the sealing surface of alloy component caused by.
2, improper shape and bad operation of the damage, improper installation and maintenance, resulting in sealing surface work is not normal, the valve runs in disorder, prematurely damaged the sealing surface.
3, chemical corrosion of medium. Medium direct chemical reaction with the sealing surface, sealing surface corrosion. The electrochemical corrosion. Contact between the sealing surface, sealing surface and the closure of the valve body and the concentration of media exposure and poor, poor concentration of oxygen causes, electrochemical corrosion.
4. Erosion of medium. It is the medium flow of the sealing surface wear, erosion, cavitation results. The medium mixed injection and local vaporization, air explosion impact surface of the sealing surface, resulting in local damage. Medium at a certain speed, medium fine-grained pelagic collision sealing surface to cause local damage; direct scouring medium high speed liquid the sealing surface to cause local damage.
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