Several points that cause easy damage to the sealing surface of high pressure ball valves（三）
Fifth, the high pressure ball valve media chemical erosion, the media near the sealing surface in the case of not generating current, the media directly with the sealing surface chemical action, erosion of the sealing surface.
Six, high-pressure ball valves improperly installed and poorly maintained resulting in the sealing surface is not working properly, sewage valve operating with disease, premature damage to the sealing surface. Damage caused by improper selection and poor manipulation. Mainly in the premise of not selecting the valve according to the working conditions, the cut-off valve as a throttle valve, resulting in the closure of the pressure is too large and closed too quickly or closed tight, so that the sealing surface erosion and wear.
Seven, high-pressure ball valve sealing surface processing quality is not good, mainly in the sealing surface cracks, porosity and ballast defects, because of improper selection of overlay welding and heat treatment specifications and overlay welding and heat treatment process caused by poor manipulation, sealing surface hardness is too high or too low, because of material selection errors or improper heat treatment, sealing surface hardness is not uniform, not resistant to erosion, mainly because the bottom layer in the overlay welding process Metal blowing to the top, diluting the sealing surface alloy composition caused by.
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