In addition, in the design of valve body welded joints, in order to align and locate, there is a circular assembly gap at the root of the weld. Under the action of internal pressure and external load, this gap will produce several times the stress concentration of dry normal working stress, which also makes it difficult for engineers to deal with.

Classification of pneumatic ball valves:
Pneumatic steam ball valve: the pneumatic steam ball valve is composed of a pneumatic actuator and a precision casting high platform ball valve. With purified dry compressed air as the power source, it receives air signals or electrical valve locators, solenoid valves and other accessories, and receives electrical signals to work. It has the characteristics of compact overall structure, quick opening and closing, simple operation and good reliability.