Operating principle and capabilities:
The series HGL, HG pump is really a kind of single-stage and single-cylinder rotary piston vacuum pump. It is actually drastically improved 
series H rotary piston pump and incorporates 4 patents; its standard capabilities possess a good improvement.
Rotary piston vacuum pump can be a kind of vacuum production gear appropriate for pumping ordinary gases and condensable gases(when a gasoline ballast used). The pump has to be fitted with ideal accessories if fuel is wealthy in oxygen, explosive, corrosive to ferrous metal, chemical reactive with vacuum pump oil.
Operation principle present in working 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 whole pump chamber is divided into chamber A and chamber B by piston. When shaft rotates the volume of chamber A and chamber B are changed repetitively, to ensure that pumping objective might be accomplished.
The series HGL, HG pump is usually a backing pump when mixed with an additional higher vacuum pump too as operate singly. It is actually extensively used in vacuum smelting, vacuum drying, vacuum impregnation and higher vacuum simulation testing,etc.
