Rs single stage rotary vane vacuum pumps are directly connected small pumps with outer covers of aluminum alloy as the electical macnery.They are efficient in heat dissipation and can maintain a good performance for a long time and their quality is very good. The pumps are advanced in stable functioning and low noise. Ts  equipment is for acquiring rough vacuums and middle vacuums, and also is basic equipment for acquiring the vacuum environment by evacuating gas from the enclosed container. it can be used alone, or it can serve as the backing pump and prepump of a roots pump,diffusion pump and molecular.