Eductors – Jet Pumps
Eductor Nozzles — The Motive Connection
Manufactured to specified finish and concentricity, assuring performance vastly superior to that of competitive units. Eductors operate on the basic principles of flow dynamics. This involves taking a high pressure motive stream and accelerating it through a tapered nozzle to increase the velocity of the fluid. Gas Motives are compressible fluids and are put through a converging-diverging nozzle. The gas can exceed the speed of sound. This fluid is then carried on through a secondary chamber where the friction between the molecules of it and a secondary gas (generally referred to as the suction fluid) causes this secondary gas to be pumped. These fluids are intimately mixed together and discharged from the eductor.
Eductor Nozzle Models: Liquid, Heating, and Steam/Air types.
Eductor Specifications
There are three connections common to all venturi eductors.
Motive Connection
This connection is where the power for the eductor is generated, by increasing the velocity of the motive fluid.
Suction Connection
This connection of the eductor is where the pumping action of the eductor takes place.
Discharge Connection
As the motive fluid entrains the suction fluid, part of the kinetic energy of the motive fluid is imparted to the suction fluid.
Providing a smooth flow path is critical to optimum eductor performance. As a result of this feature, the motive fluid achieves more velocity through the eductor body, and this means more energy is used for pick-up of the suction fluid. Also, better flow paths in the diverging section of the eductor allow it to achieve better discharge pressures. Other makes are weak and subject to breakage during installation. All units have wrench flats to prevent damage during installation.
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