Jiangsu Bangz Petrochemical Equipment Manufacturing Co., Ltd. Breathing valve overpressure 10 refers to a patented breathing valve with overpressure 10 full opening performance, which is produced by Jiangsu Bangz Petrochemical Equipment Manufacturing Co., Ltd. Breathing valve refers to a valve that not only ensures that the storage tank space is isolated from the atmosphere within a certain pressure range, but also can communicate with the atmosphere (breathing) when the pressure exceeds or falls below this range.