Operating principle and features:
The series HGL, HG pump can be a form of single-stage and 
single-cylinder rotary piston vacuum pump. It can be considerably enhanced series H rotary piston pump and consists of four patents; its basic capabilities have a excellent improvement.
Rotary piston vacuum pump is often a type of vacuum manufacturing tools suitable for pumping ordinary gases and condensable gases(when a gas ballast used). The pump need to be fitted with acceptable accessories if gasoline is wealthy in oxygen, explosive, corrosive to ferrous metal, chemical reactive with vacuum pump oil.
Operation principle show in doing work principle graph: A rotary piston with slide valve across ecentric wheel driven by shaft inside the housing. Piston pole can slide and swing freely in arch track. The entire pump chamber is divided into chamber A and chamber B by piston. When shaft rotates the volume of chamber A and chamber B are altered repetitively, to ensure that pumping function could be achieved.
The series HGL, HG pump is usually a backing pump when combined with a different higher vacuum pump at the same time as operate singly. It is extensively utilized in vacuum smelting, vacuum drying, vacuum impregnation and large vacuum simulation testing,etc.
