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The jet pump may be a centrifugal pump with more than one impeller and diffuser with all the addition of a jet ejector.

 

The nozzle receives water at underhand. As the water passes with the jet, water speed (velocity) is greatly increased, but your pressure drops. This action is similar to the squirting action you receive with a garden hose as when you start to close the nozzle.

 

The greatly increased water speed additionaly this low pressure around the particular nozzle tip, is what causes suction to develop around the jet nozzle. Water around a plane nozzle is drawn on the water stream and carried coupled with it.

 

For a jet nozzle to be effective it must be put together with a venturi. The venturi changes that high-speed jet stream to a high-pressure for delivery to the centrifugal pump. The jet and venturi are usually simple in appearance but they need to be well engineered and carefully matched being efficient for various pumping conditions. The jet nozzle and venturi are often called ejectors/ejector kits.

 

On a shallow-well plane pump the ejector set up (jet nozzle and venturi) is located in the pump housing while you're watching impeller. A portion with the suction water is recirculated in the ejector with the rest planning to the pressure tank. When using the ejector located on the suction side with the pump, the suction is definitely increased considerably.

 

This enables a centrifugal pump to boost its effective suction raise from about 20 feet up to 28 feet.

 

But, the number of water delivered to the storage tank becomes less as being the distance from the pump on the water increases… more water needs to be recirculated to operate the ejector.

 

The difference between a deep-well jet pump plus a shallow-well jet pump will be the location of the ejector.

 

The deep-well ejector is located in the well below the water level. The deep-well ejector works quite as as the shallow-well ejector. Water is supplied for you to it under pressure from the pump. The ejector then returns water plus an additional supply from the well, to a level the place that the centrifugal pump can lift it the other way by suction.

 

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