Working principle and functions:
The series HGL, HG pump is a kind of single-stage and single-cylinder rotary piston vacuum pump. It truly is greatly improved series H rotary piston pump and contains four patents; its general capabilities possess a good improvement.
Rotary piston vacuum pump is really a kind of vacuum manufacturing equipment appropriate for pumping ordinary gases and 
condensable gases(when a fuel ballast used). The pump have to be fitted with appropriate accessories if gas is rich in oxygen, explosive, corrosive to ferrous metal, chemical reactive with vacuum pump oil.
Operation principle show in functioning 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 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 modified repetitively, in order that pumping function could be accomplished.
The series HGL, HG pump might be a backing pump when mixed with a different high vacuum pump as well as operate singly. It truly is broadly used in vacuum smelting, vacuum drying, vacuum impregnation and higher vacuum simulation testing,and so forth.
