The flow side is connected to the motive or driving fluid. Because of the continuous flow of driving fluid and venturi effect the pump takes suction and discharge it through the outlet via a diffuser to obtain a better pump efficiency. There are a ton of applications for Eductors in various industries where they want a low-cost alternative for the centrifugal pumps. They are used for handling solid waste in granular form or slurries, mixing of liquids, create vacuum, agitate liquid and pumping operations.
Thanks to their low cost and having no moving parts they are widely used as the main pump in hazardous areas. Further on the ship, they are used as the priming pump for centrifugal pumps, as stripping pump in ballast management, In vacuum toilets, In generating a vacuum in a freshwater system, pumping out slurries and residue in oil tanker.
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Skip to content. Eductor Pump Working Principle. I assume it was manufactured between and Hope that gives you an idea. Carl Spanyer. What was the question? The primciple of the air ejector is to exhaust the air remaining from the processor in excess amount. This is one that leads others. It is like a leader of a group or someone that you can learn from.
If you removed the bolt, you probably lost the ejector spring. A new one can be had from Numrich Gun Parts. To replace the ejector spring, remove the bolt, and take out the spring from the bottom of the receiver just behind the ejector port.
Difference between spirogyra and mushroom. Put a drop of lubricant on it then use a spent casing to push the ejector in and out to get the lubricant to the spring. What are the difference between France and America? Log in. Chemical Engineering. Mechanical Engineering. The Difference Between. Study now. See Answer. Best Answer. Study guides. When do we use Eductor or Ejector?
Any related web site will be appreciated too. Many thanks,. Posted 17 January - PM Hahi: Eductors and ejectors both have the same funtionality in that they both use a motive fluid to produce some vacuum.
In fact, some dictionaries say that the two words are synonymous. In general, when the motive fluid is a gas and the produced vacuum is used to evacuate or to vent a vessel or system, I would use the word ejector. When the motive fluid is a liquid and the produced vacuum is use to draw in another fluid or a powder and mix it with the motive fluid, then I would use the word eductor.
Where they start to differ is in the motive fluid:. An ejector uses a gas phase motive, usually steam or air. An eductor uses a liquid phase motive, usually water. Motive nozzle: The motive nozzle in a gas jet ejector is almost always a "converging-diverging" nozzle.
The motive nozzle for a liquid jet eductor is almost always just a "converging" nozzle. Suction head size: The head of a gas jet ejector can be but not always is a tee pipe sizes larger than the suction connection size. The head of a liquid jet eductor is a tee pipe sizes larger than the suction connection size.
It almost always longer than a "standard" tee of that size. Throat bore size: In a gas jet ejector, it is practice to limit the throat bore size to 0.
In a liquid jet eductor, this can be as much as 0. This helps to explain why these units are loud. Liquid jet eductors are usually quiet. Throat length: In a gas jet ejector, the overall throat length end of suction head to outside face of discharge flange is usually between 6. Multinozzle units may be a bit shorter. In a liquid jet eductor, this number is usually between 4 and 5 X the discharge diameter. Overall, though, if you see a unit such as this, it really is hard to determine what it is.
Both look the same from the outside. In terms of what Croll Reynolds manufactures:. Single and multi-stage vacuum systems Thermocompressors of all sorts "BL" series NCG scavenging ejectors and turbine gland ejectors small pressure differential operating near atmospheric pressure Siphon ejectors steam motive pumping water Atmospheric air ejectors used to extend the range of liquid ring vacuum pumps Gas jet compressors Sulfur pit ejectors.
The last two are used primarily by the petrochemical industry, where the word "eductor" is engrained. Try as we might, there probably is no changing this. It is possible to combine both devices in vacuum service.
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