A40 type full open safety valve with radiator is suitable for working temperature ≤ 425 °C, A40Y-16I~40I type is suitable for working temperature ≤ 425 °C air, petroleum gas and other media equipment and pipelines, as an overpressure protection device. When the pressure in the equipment and the passenger road exceeds the allowable value, the valve automatically opens, and then the full amount is discharged; When the pressure is reduced to the specified value, the valve automatically closes to ensure the full operation of the equipment.