Features: 1) The low pressure CO2 fire extinguishing system is designed on the basis of the principle of high pressure CO2 fire extinguishing system and it has an advantage over the latter 2) Advantages: a) Due to low temperature storage, the system is with low pressure, huge storage volume, high extinguishing efficiency and small occupation space b) Under low pressure, all its steel bottles, pipe net, valves and nozzles do not need resistance to high pressure. So the low pressure system is more economical than the high pressure one. Especially for large system construction, the low pressure system may save more than 30% of the investment of the high pressure system c) The low pressure system could not only be pre-timed for automatic ejecting, but also be started or closed manually at any time to control the ejection. This particular property makes it more suitable for where frequent fire danger exists d) The evaporator of the refrigeration unit in the low pressure system uses demountable design, which makes it easy for maintenance e) Both the master valve and the select valve are reliable and convenient for operation