Working principle and functions:
The series HGL, HG pump can be a kind of single-stage and single-cylinder rotary piston vacuum pump. It’s drastically enhanced series H rotary piston pump and contains four patents; its general capabilities have a fantastic improvement.
Rotary piston vacuum pump is usually a sort of vacuum production gear suitable for pumping ordinary gases and condensable gases(whenever a gas ballast used). The pump must be fitted with ideal add-ons if gas is wealthy in oxygen, explosive, corrosive to ferrous metal, chemical reactive with vacuum pump oil.
Operation principle present in working 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 changed repetitively, so that pumping objective may be achieved.
The series HGL, HG pump may be a backing pump when mixed with a further higher vacuum pump at the same time as operate singly. It is actually extensively utilized in vacuum smelting, vacuum drying, vacuum impregnation and higher vacuum 
simulation testing,and so forth.
ROTARY PISTON VACUUM PUMPS
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