The A40Y-16C type full opening safety valve with radiator spring is suitable for equipment and pipelines with working temperature ≤ 420 ℃, and the A40Y-16I type full opening safety valve with radiator spring is suitable for equipment and pipelines with working temperature ≤ 450 ℃ for media such as air and petroleum gas, as an overpressure protection device. When the pressure inside the equipment and pipeline exceeds the allowable value, the radiator spring fully open safety valve will automatically open, and then discharge the full amount; When the pressure drops to the specified value, the radiator spring fully open safety valve will automatically close to protect the safe operation of the equipment.