As an elastic compensation element, pneumatic ball valves involve various disciplines, such as elasticity, material mechanics, and welding. Therefore, the design, manufacturing and inspection of pipe, the main component of pipe pneumatic ball valve, puts forward higher requirements. If the link is not fully considered, the pipe pneumatic ball valve may fail, 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 external pressure pipe pneumatic ball valve.
In general, it is necessary to find out the lessons learned from the failure of pneumatic ball valves to avoid similar accidents in the future. Several reasons for failure are summarized as follows: a. Improper transportation and storage of non pneumatic ball valves; b. Improper installation method: c. Improper support system or damaged fixed support in use: d. Non pneumatic ball valve pipe corrosion (stress corrosion, intergranular corrosion, pitting corrosion, 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 pneumatic ball valve.