This standard specifies the terms and definitions, classification and labeling, requirements, test methods, inspection rules and signs, instructions for use, packaging, transportation and storage of vertical steam sterilizers. This standard applies to vertical steam sterilizers (hereinafter referred to as sterilizers) with a rated working pressure below 0.25MPa. This sterilizer is mainly used in medical and health, scientific research and other units to sterilize medical equipment, laboratory vessels, culture media, and non-closed liquids or preparations.