Piston Rotary Vacuum Pump is one of the vacuum pumping equipment of pumping general gas or gas with a little grumous steam (should use the gas ballast unit).

The pump is suitable for vacuum smelt, vacuum dry, vacuum metallizing, vacuum soakage and other vacuum workings. It can be used singly, can be used as the front stage pump of other vacuum pumps too, such as Roots Air Blower Pump, Diffusion Pump and other High Vacuum Pumps. However it's not suitable for pumping from one container to another container. It's not suitable for pumping gas that with many percent of oxygen and corrosive to the black color metals, and reaction with vacuum oil.