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The A21H spring-loaded micro-opening external thread safety valve is suitable for equipment and pipelines carrying media such as air, ammonia, and petroleum gas with an operating temperature ≤200℃. The A21W type is suitable for equipment and pipelines carrying corrosive gases or liquids with an operating temperature ≤200℃. The A21F type is suitable for equipment and pipelines carrying liquefied petroleum gas and other similar media with an operating temperature ≤200℃, serving as an overpressure protection device. When the pressure inside the equipment and pipeline exceeds the allowable value, the valve automatically opens and then fully discharges the pressure; when the pressure drops to the specified value, the valve automatically closes, ensuring the safe operation of the equipment and pipeline.