2XZ series the vacuum pump is a double class coupling the , function of its work be constituted partially by high pressure class and low-pressure class second, its inhalation the technique for vacuum for air for and vacuum equipments connect, while revolving air in the container the large quantity inhale withing eject, bing the equipments acquiring the vacuum, high pressure class row spirit valve closing, high pressure class entrance will transfering second degreely, and through second degree inhalation with ejecting vacuum equipments can acquiring certainly, that pump count to 6 ×s 10-²