A61H/Y60, A61H/Y - 320 type spring tiny qi type air compressor valve is suitable for the working temperature of 200 ℃ or less medium such as air, ammonia, liquefied petroleum gas (LPG) of equipment and piping, A61Y60P, A61Y - 320 - p type is suitable for the working temperature of 200 ℃ or less corrosive gas or liquid of equipment and piping, as the overpressure protection device.