... Purifying Device Applies to SF6 gas recovery, purification treatment, storage and recharge for switch of high-voltage switch manufactory, electrical ... standard GB/T 12022-2006.Integrated liquefaction, purification and storage of recovered SF6 gas.The unique purification technique ( ... h (Roots multicell pump)It can be vehicularVolume of storage tank300L Vacuum pumping speed64m3/h Limit vacuum degree≤10Pa ...