Marine eductor in ships relies on a high-speed jet which produced by the high-pressure working flow when go through the eductor nozzle to suction the needed fluid and exchange momentum to increase the energy of the ejected fluid, thus realizing the effect of the suction and discharge.

The general driving water used by marine eductor is pressured sea water, which is produced by a centrifugal sea water pump and the suction water are bilge water and ballast water. Marine eductor structure is simple.

The marine eductor’s nozzle is a smooth and sharply contracted conical tube, one side is connected with the driving water inlet pipe, and the other side is inserted into the suction pipe. The mixing chamber is connected with suction chamber and which are made up of conical throat and cylindrical pipe,The front of the expanded diffuser pipe is connected to the mixing chamber, and the rear end is connected to the discharge pipe.

Working Principle
1. The driving water forms a high-speed jet through the nozzle
2. The driving water suction the bilge water or ballast water and mixed in mixing chamber where exchanges momentum
3. Fluid flowing through the diffuser chamber converts velocity energy into pressure energy

Characteristics
1. Low efficiency
2. Simple structure, small volume, low price
3. No moving parts, reliable operation, low noise and long service life
4. Good suction performance
5. It can transport dirty liquid containing solid impurities, and it also can work even if it is submerged in water