The use of oil-free intermediate seal, multiple sealed way to ensure the high clean vacuum environment in the rotor chamber.

Advanced processing to ensure the good geometrical symmetry of the rotors, as well as low noise and long service life.

Special shaft seal is used to achieve the long stable running without oil leakage.

The BSJ-L series is made of all-aluminum alloy, heat sink, corrosion resistance, and efficient energy saving.The BSJ-LC series is made of cast iron. The

unique liquid coupling method enables the pump to start directly under the atmosphere, which greatly reduces the time of pumping.

Compact structure, light weight, and small volume.