打开气压阀门后充气至设定压力后关闭阀门，保持压力60s后测定压降情况，若压降大于预设值则判定不合格。-Inflated to the set pressure to close the valve after opening the air pressure valve to keep the pressure 60s after the determination of the pressure drop, the pressure drop is greater than the default value is judged unqualified.