Working principle and functions:
The series HGL, HG pump can be a kind of single-stage and single-cylinder rotary piston vacuum pump. It truly is considerably enhanced series H rotary piston pump and includes 4 patents; its common abilities have a great improvement.
Rotary piston vacuum pump is a sort of vacuum manufacturing products suitable for pumping ordinary gases and condensable gases(when a gas ballast applied). The pump have to be fitted with appropriate accessories if fuel is rich in oxygen, explosive, corrosive to ferrous metal, chemical reactive with vacuum pump oil.
Operation 
principle display in operating 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 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 changed repetitively, so that pumping purpose could be accomplished.
The series HGL, HG pump is often a backing pump when mixed with yet another large vacuum pump at the same time as operate singly. It is actually widely used in vacuum smelting, vacuum drying, vacuum impregnation and substantial vacuum simulation testing,and so on.
