... blower 1.high pressure roots blower 2.three lobes rotary type 3.cast iron frame Main features:High rotary speed(the maximum ... accessories:motor,electric starter,accousic enclosure.PerformanceBlower: Vacuum Pump:Pressure rise:9.8~98Kpa Vacuum:-9.8~-49KpaFlow capacity: ... ,outler silencer,pully,belts,belts cover,pressure release valve, check valve,flexible joint,pressu-re gauge,shock absorber,expansion ...