Qingdao Ruifeng Gas Co., Ltd. is located at the foot of Qingdao Lao Mountain, with a superior geographic position. The company is the only gas enterprise in Qingdao city who have obtained the ISO9001 certificate of quality management system and we have more than 10 million RMB of investment. Our company produces low-temperature liquid equipment and complete set of gas equipment which mainly including low-temperature insulated cylinder, low temperature liquid storage tank, low-temperature liquid ...