Operating principle and characteristics:
The series HGL, HG pump is a sort of single-stage and single-cylinder rotary piston vacuum pump. It can be considerably improved series H rotary piston pump and involves four patents; its standard capabilities have a great improvement.
Rotary piston vacuum pump is really a kind of vacuum manufacturing equipment suitable for pumping ordinary gases and condensable gases(when a fuel ballast utilised). The pump should be fitted with suitable equipment if gas is rich in oxygen, explosive, corrosive to ferrous metal, chemical reactive with vacuum pump oil.
Operation principle present in operating principle graph: A rotary piston with slide valve across ecentric wheel driven by shaft in 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 transformed repetitively, to ensure pumping function may be attained.
The series HGL, HG pump is usually a backing pump when combined with a different large vacuum pump as well as operate singly. 
It can be broadly utilized in vacuum smelting, vacuum drying, vacuum impregnation and high vacuum simulation testing,and so forth.
