It is mainly used for mining ambulance service was filling oxygen respirator, compression oxygen for oxygen tanks, and save for chemical, oil, medical, fire control and other relevant station fill oxygen when used. It is an oxygen filling equipment that step up oxygen pressure from source bottle to another gas bottle, let the oxygen pressure of this gas bottle achieve the needed pressure. It is used for pump oxygen, nitrogen and carbon dioxide from source gas bottle and fills in the gas bottle which is waiting for inflating.