Eductors are liquid jet pumps which use a liquid to entrain another liquid or slurry, mix them and lift the mixture against gravity or pressure.
In operation, the motive liquid enters the eductor mixing chamber through the nozzle as a high velocity jet. The jet entrainment action suck up the surrounding liquid and accelerate it. Both liquids are thoroughly mixed up to velocities equalize at the Venturi throat. At the divergent cone the kinetic energy is converted to pressure one according to the Benouilli theorem.
Pumping, Mixing of liquids, Dilution of acids or lyes, Striping the cargo hold bilges and Increasing N.P.S.H. for centrifugal pumps