Located in hi-tech development district of Chongqing, Chongqing Tongsheng Electromechanical Co., Ltd. (Chongqing Tongsheng Electromechanical Institute) is a hi-tech enterprise and professional in research, design and production of oil-purifier; One of cooperative company of state operating oil standard and qualified enterprise of ISO9001-2000 standard; Only company provided manufacturing license of anti-explosion oil-purifier; Exclusive authorized company of advanced company in the counterparts of state technological inspection bureau of China. We hammer away to research and development of oil-purifier. Introduced overseas advanced technology, the technology of vacuum oil-purifier is far ahead and provided national patent. Various equipments are produced according to the standards of JB/T5285-91 of former mechanical industry department of China, DL/T521-93 and enterprise standard of former electric department. Our products are sold widely in China and Southeast Asia, etc district.