... ventilation rate under the perssure in 1000-1Pa,and a quick action that leads to limit pressure ... .PTR(B) is mainly used to pump and transport air or other gases,which is widely ... steel vacuum,space simulation,low desity wind tunnel and son on.In addition,it can be used ... of evaporation,distillation,drying in some industries like food and medicine.MODELPOWERROTATIONVOLUMEVACUUMKWr/mm3/minKpaPTR(B)-501.1~ ...