FSV VSD+high-efficiency energy-saving oil-free two-stage vacuum pump series: As the first major innovation of crude vacuum pump in this century, this series of vacuum pump has the following multiple advantages: average energy saving of 50%, silent technology, clean operation and compact integrated unit, as well as advanced and mature compressor technology. Clean, quiet and energy-saving. Our FSV VSD+can reduce energy costs by an average of 50% and increase production speed. FSV VSD+is a series of efficient and intelligent vacuum pumps adopting variable speed drive (VSD) technology.