JZJX series Roots-rotary vane unit is composed of ZJP Roots vacuum pump (main pump) and rotary vane vacuum pump (front pump). The unit has the characteristics of high vacuum height and wide range of pumping speed. It is more suitable for pumping dry and clean gas. The series of units have been widely used in chemical, light industry, petroleum, medicine, printing and dyeing, electrical appliances, electric vacuum, semiconductor, food, atomic energy, textile and other industries.