Covering fields such as chemical engineering and metallurgy, dry rotary vane pressure pumps are used for processes such as solvent recovery and metal degassing. RYYB sealing technology is leak proof and can withstand high temperatures (150 ℃) and corrosive media; The energy efficiency ratio has been increased by 30%, and the annual operating cost has been reduced by 150000 yuan per unit. The case shows that in the fine chemical distillation process, vacuum stability increases product purity to 99.9%.