A41 micro-open safety valve is suitable for equipment and pipelines with working temperature ≤ 300°C for air, oil, water and other media. A41Y type is suitable for working temperature ≤ 200 °C corrosive medium equipment and pipelines, when the pressure in the equipment and pipeline exceeds the allowable value, the valve automatically opens, and then full discharge, when the pressure is reduced to the specified level, the valve automatically closes to ensure the safe operation of the equipment and pipelines.