Working principle and options:
The series HGL, HG pump is really a type of single-stage and single-cylinder rotary piston vacuum pump. It is actually drastically enhanced series H rotary piston pump and consists of four patents; its standard abilities have a good improvement.
Rotary piston vacuum pump is usually a sort of vacuum manufacturing gear appropriate for pumping ordinary gases and condensable gases(whenever a gasoline ballast applied). The pump should be fitted with suitable add-ons if gas is rich in oxygen, explosive, corrosive to ferrous metal, chemical reactive with vacuum pump oil.
Operation principle display in functioning 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 modified repetitively, so that pumping objective might be attained.
The series HGL, HG pump might be a backing pump when mixed with a further large vacuum pump too as operate singly. It is actually broadly used in vacuum smelting, vacuum drying, vacuum impregnation and large vacuum simulation testing,etc.
