Operating principle and characteristics:
The series HGL, HG pump is a type of single-stage and single-cylinder rotary piston vacuum pump. It’s drastically improved series H rotary piston pump and incorporates four patents; its standard abilities possess a good improvement.
Rotary piston vacuum pump is a kind of vacuum manufacturing tools ideal for pumping ordinary gases and condensable gases(when a gas ballast applied). The pump need to be fitted with suitable equipment if fuel is wealthy in oxygen, explosive, corrosive to ferrous metal, chemical reactive with vacuum pump oil.
Operation principle demonstrate in operating 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, in order that pumping purpose might be accomplished.
The series HGL, HG pump is usually a 
backing pump when combined with an additional higher vacuum pump too as operate singly. It truly is extensively utilized in vacuum smelting, vacuum drying, vacuum impregnation and high vacuum simulation testing,etc.
