Working principle and options:
The series HGL, HG pump is usually a kind of single-stage and single-cylinder rotary piston vacuum pump. It is actually significantly enhanced series H rotary piston pump and contains four patents; its standard abilities have a good improvement.
Rotary piston vacuum pump is usually a sort of vacuum production products suitable for pumping ordinary gases and condensable gases(whenever a gasoline ballast used). The pump should be fitted with proper equipment if gasoline is wealthy in oxygen, explosive, corrosive to ferrous metal, chemical reactive with vacuum pump oil.
Operation principle display in doing work principle graph: A rotary piston with slide valve across ecentric wheel driven by shaft within 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 purpose can be accomplished.
The series HGL, HG pump can be a backing pump when combined with yet another higher 
vacuum pump too as operate singly. It can be widely used in vacuum smelting, vacuum drying, vacuum impregnation and higher vacuum simulation testing,and so on.
