Analysis of Causes for Failure Analysis of Marine Valves

The failure of marine valves generally includes valve body bonnet failure, packing failure, gasket failure, and the like.
Analysis of common faults and causes of valve body and valve cover
Common faults in the valve body and bonnet are nothing more than damage, sanding and aging or corrosion damage. The reasons for these failures may be as follows.
         (1) The cause of damage to the valve body and bonnet is mainly due to poor design factors such as small safety factor, unreasonable structure, internal stress concentration, etc., or poor manufacturing quality, such as uneven thickness and uneven material; The weld is too brittle, the internal stress is too large, and the welding quality is poor; or the position is skewed due to improper installation; or the improper selection of the valve is not compatible with the working conditions; or because the water hammer pressure is too high; or due to poor maintenance Winter insulation is not badly cracked; or it is destroyed by strong external force.
        (2) The cause of the blisters is mainly due to poor manufacturing quality.
        (3) Corrosion or aging is mainly caused by poor manufacturing quality or due to improper corrosion protection and maintenance.