A high velocity jet stream is created within the jet tube producing a powerful vacuum. As indicated in the diagram gravel is dredged into the suction hose and is delivered to the sluice jet flare. As a slurry of water and gravel enters the jet flare and is spread evenly over a classifier screen.
NCI jet pumps for pumping operate on the basic ... This connection is where the power for the ... to push additional fluid into the suction connection of the jet ...
The Marlex Jet flare is built with a longer straight section and flare making it possible to use a shorter power jet to reduce weight. The jet flare design also improves fine gold recovery and increases suction power. The jet flare also makes the dredge easier to set up in shallow water conditions.
Suction pipe is not far enough down into the water. Ensure that end of suction pipe is into the water far enough. End of suction pipe is down too far into source of water and is buried in mud or dirt. Make sure suction pipe is not too close to bottom of well, lake, etc. so that it cannot pick up mud, etc.
The greatly increased water speed plus the low pressure around the nozzle tip, is what causes suction to develop around the jet nozzle. Water around a jet nozzle is drawn into the water stream and carried along with it. For a jet nozzle to be effective it must be combined with a venturi.