As an elastic compensation element, the electric ball valve involves various disciplines, such as elasticity, material mechanics and welding. Therefore, the design, manufacturing and inspection of pipe, the main component of pipe electric ball valve, puts forward higher requirements. If the link is not fully considered, it may lead to the failure of the electric ball valve, or even cause greater economic losses.
In addition to general fatigue, corrosion and unstable external pressure, steam and water impact is also one of the unique failure modes of electric ball valves for external pressure pipes.
In general, it is necessary to find out the lessons learned from the failure of electric ball valves to avoid similar accidents in the future. Several reasons for failure are summarized as follows: a. Improper transportation and storage of non electric ball valves; b. Improper installation method: c. Improper support system or damaged fixed support in use: d. Non electric ball valve pipe corrosion (stress corrosion, intergranular corrosion, pitting, dew point corrosion, crevice corrosion, etc.); e. System overpressure or deformation; f. Vibration damage (including erosion); g. Foreign matters accumulated in wave cavity of non electric ball valve.