Working principle and capabilities:
The series HGL, HG pump is actually a kind of single-stage and single-cylinder rotary piston vacuum pump. It is actually greatly enhanced series H rotary piston pump and includes 4 patents; its standard capabilities have a terrific improvement.
Rotary piston vacuum pump is usually a sort of vacuum manufacturing equipment ideal for pumping ordinary gases and condensable gases(when a fuel ballast utilised). The pump has to be fitted with appropriate equipment if gas is rich in oxygen, explosive, corrosive to ferrous metal, chemical reactive with vacuum pump oil.
Operation principle demonstrate in working 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 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 pumping function could possibly be accomplished.
The series HGL, HG pump is often a backing pump when combined with one more higher vacuum pump at the same time as operate singly. It is widely used in vacuum smelting, 
vacuum drying, vacuum impregnation and high vacuum simulation testing,and so forth.
