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The pneumatic welding ball valve is composed of a pneumatic actuator and a ball valve body. It uses a welding connection method. After welding, the connection strength is high and the leakage risk is low. It is suitable for high-pressure conditions. The valve body adopts a full-through design, has a small flow resistance, and is driven by the air source to achieve quick opening and closing. It is only for medium on/off and should not be used for flow regulation. No need for manual operation on site, can be connected to automatic control system, realize remote switch control. It is widely used in chemical industry, water treatment, oil and gas, heating and other industrial pipelines to transport water, oil, gas and weakly corrosive media.