Why does the seal come off when I pull out the Xiaomi Portable Electric Air Compressor 2 to inflate my motorcycle?

Because the tire pressure of road bike is relatively high (some tire pressure may be up to 120psi), the air pressure between the Presta valve seal and the valve core is also high. If you quickly open the valve under high pressure, there is a possibility that the Presta valve internal seal will be washed out by the high air pressure due to the short pressure relief time. When pumping up a road bike to 80psi or more, it is recommended to operate the valve slowly and wait until the Xiaomi Portable Electric Air Compressor 2 displays a drop in air pressure before pulling out the valve as a whole. If the seal falls off during use, it can be manually put back on without affecting the next use.