JZJS series vacuum system uses the liquid ring pump as the backing pump. Its performance is especially applicable in procedures which pump the gas with large amount of vapor and somewhat corrosive or concreting gas. The system has reliable quality and stable performance. It has been equipped with electric control system, by-pass pipe, and overflow valve. The technical parameter is 4×10² and 101. This system is applicable to many sectors such as vacuum distillation, concentration, dehydrated crystallization and evaporation, electric capacitor and transformer manufacturing.