Air ejector which uses air of atmosphere pressure as the motive fluid.
It's simple structure comprised a suction chamber, diffuser and nozzle.
After a pump reduces vacuum chamber pressure to between 70 ~ 50 Torr, the motive valve in front of the nozzle of the air ejector is opened.
Where upon outside atmosphere enters the diffuser through the nozzle at a supersonic rate.
This jet flow, coupled with the diffuser's action, reduces pressure at the intake port of the air ejector to below that of a liquid ring vacuum pump alone.
Ultimate pressure under no load is 12 Torr with single stage of liquid ring vacuum pump, 6 Torr with double stage of liquid ring vacuum pump.
