Jet pump for sluice system 10 cm

incl. 19% VAT
plus shipping and handling

Scope of delivery

  • 1x Suction port "bucketwise" 10mm for jet pump (length ca 30cm)
  • 1x Pump body with hose connector 10mm
  • 1x diffuser jet pump, aluminum, 8mm
  • 1x jet blasting pump, aluminum, 10mm
  • 1x PVC clear hose 10mm ca 30cm
  • 2x sealing rings for diffuser and nozzle, approx. 10mm

Recommended accessories:



Jet Pump for Sluice System 10cm

What is the need for a jet pump?

The biggest problem with the wash-out is to achieve a truly even and continuous feeding of material into the gutter. Let's say we want to fill the gutter with a teaspoon. It happens as follows: As soon as the contents of the spoon get into the water stream, the first ripples are already overloaded:

  • The swirls over the riff break together
  • The material no longer touches the riff
  • The riffs are completely overfilled
  • There is a "surge" or "impact", ie a disturbance in the flow of the channel.

The result is that gold trapped behind ripple is flushed out or gold can not be caught from the material. It would be true, however, to add only so much material that the above disturbance does not occur, or only minimally or very locally, and that is exactly what the jet pump does!


The jet pump produces a uniform, very finely metered flow of material which can be introduced into the channel without "impact" or "surge". This is also supported by the hopper, but the jet pump is the most important component. In addition, the pump is very small and can also be operated in many situations independently of the wash-out system (see L below). To date, no one has dared to use such a jet pump since the design is very difficult and the production represents a real challenge. We have needed more than a year to make the jet pump reliable and keep it at a reasonable price. A jet pump has been opened, which is opened for cleaning purposes (which I have not yet seen in any jet pump!) And can be operated at small pressures and water levels. By the use of hose nozzles when connecting the jet pump body to the suction nozzle, any suction connections can be used. Here everybody can let off steam! If you have any requirements, please do not hesitate to contact us. We can supply the individual parts as well as the complete suction cups according to your requirements!

Key data:

  • Drive pressure: At least 0.4 bar, maximum 5 bar (then the hose bursts). If the hose is suitable, 10 bar should be used.
  • Conveying size: The jet pump can safely transport material of grain size 2mm. Larger grain sizes can work, but this depends on too many factors that we can assure. At 5mm is definitely close, here the diffuser delivered with clogging. Ask them if they want to transport other grain sizes, for money we make everything!
  • Flow rate: No information can be given as this is very much dependent on the material and the pumps used. I have already helped with my setup one liter per minute. The question is here, what can the gutter run?
  • Service life: The jet pump is a wear part and therefore without a "CV" guarantee. It is clear, however, that the jet pump will in many cases survive its pressure pump! I have not broken my jet pump in the last two years. Please call us, if there is a problem, we are ever known to be very customer-friendly (and stay it).
  • Delivery height: The delivery height is defined as the height difference between the outlet of the diffuser and the end of the hose which is connected to the diffuser. This delivery rate is almost exclusively dependent on the pump output on the pressure side. I've never had problems with my low-pressure system (volume pump as a pressure pump). In the washing-out system, the maximum required delivery hour is approx. 30 cm. I guess (but never tried it) that several meters should not be a problem.
  • Suction height: The suction height is defined by the difference in height between the water level in the tank where the tip of the intake port is located (e.g., feeder or bucket) and the outlet of the diffuser of the jet pump. This value also depends directly on the pump output, but this is additionally limited by the nozzle size (currently: 3mm). When using a volume pump, the suction head should be in the 30-40 cm range. The use of a hose piece between the housing of the jet pump and the suction nozzle additionally limits this value: in some cases, the vacuum in the hose is so great that it collapses. Please report it in extreme cases!


The jet pump is therefore the "certain something" and the main part of the innovation of this system. With the jet pump, it is possible to suction and transport solids which are mixed with a suction medium (in our case the water). Basically, a jet pump is the ideal implementation of the energy shredders, which we know as "dredge" or "suction dredger", very very very (I said: very?) Much more efficient. An example: The jet pump drains half a liter of water in 9 seconds with an injection pressure of 0.5 bar.

Functions of the jet pump


  • Material transport into the hopper : The basic function is to transport material from the feeder to the hopper of the washout system. The jet pump can be very finely dosed by the valve of the jet pump tubing .
  • Material transport from the sedimenter into the feeder : If all the material has been passed through and the feeder has been empty, the jet pump can simply be rearranged and pump the already washed material back into the feeder. Here you can start another wash cycle.
  • Emptying and pumping : Of course, the output of the jet pump can also be routed to any other container. For example, compensating containers can be emptied or transport containers filled.
  • Micro-Dredge at the stream : It is, of course, possible to use the jet pump as a micro-dredge and take it with the stream. For this purpose, however, the intake port should be changed, which is never a big deal. Now you can pump out small crevices and exploit narrow crevices.
  • Water pumping : I have often removed minor "flooding" with the jet pump because this pump can also pump a water / air mixture. Here she works like a wet / dry vacuum cleaner.


Together with the baffle of the feeder, the jet pump can also be used to pump almost every container (sand and / or water!). For this purpose, the baffle is removed from the container (by hand, a large union nut is loosened) and, as can be seen in the figure above, is clamped against the wall of the container. If in the example above you would drive with air (which of course is possible, compressed air of about 3 bar should do), you would have a wonderful sandblasting plant! (Do not do that at home!)


Suitable pumps

It is possible to connect the jet pump directly to the volumetric pump and to use this with it. This has only one pump in the system and this should be sufficient for many applications. The jet pump tubing can do this together with the Base Tubing . Alternate splicing is also possible; Also connect to the water tap.

If you are looking for your own pump for the jet pump, however, you have more fun in many situations (see the section "Pumps" in the product Basic Set Sluice System 10cm The problem with the volume pumps is that they can often transport a lot of water but can only build very low pressure.I use a "Ocean" pump from "Comet" , But would like to point out the relatively short life of the pump of 400 operating hours The pump is about 35 € and delivers 1.5 bar at the top Pumps with a maximum pressure of less than 0.7 bar ("transport height 7 meters" ) Are not likely to be used as pure volume pumps. Note that the jet pump on the pressure side (nozzle) requires clean water! Maximum particle size for the nozzle is 1.2mm !!

Use multiple jet pumps at the same time

In certain situations, the use of multiple jet pumps makes sense: anyone who does not want to change its tubing can work with two jet pumps and whoever wants to implement the idea of ??the "fully automatic" requires at least two jet pumps at the same time.

Options for the jet pump

There will still be some alternative intake manifolds at a later stage. The pictures show the "bucket" suction nozzle (two 90-degree bends with hose grommet downwards for the extraction of large vessels, such as buckets), which is always delivered with. Later we will offer a suction nozzle with a vertical hose nozzle (90 ° with hose nozzle for suction with long suction hose, for example a sedimentator), as well as a suction nozzle for vacuuming surfaces (without 90 degree angle, only with hose nozzle as "hand vacuum cleaner").

Tips about the jet pump

  • Length of the suction hose : The thumb rule is that the longer the suction hose, the greater the loss of suction force at the tip of the suction hose. Overall, however, this effect should be low, but not negligible. Wrinkles, however, have a relatively negative effect on the suction force! It would be ideal to connect the intake manifold to the body of the jet pump with just a few centimeters of tubing.
  • Blocking : These are easy to fix. First of all, the valve for the pressurized water supply should be closed and / or the pressure pump should be switched off. Then the suction hose should be removed from the body of the jet pump. Caution: If the level of the extracted hose is below the water level of the container in which the suction nozzle is located, the container runs empty! Pull the hose off the water level, then nothing happens. Now it can be checked whether there is something in the suction area of ??the radiator body. If not, unscrew and check the diffuser. Clean the body with water (flushing hose!). A body may have entered the nozzle of the jet pump. Then unscrew them. In this case, please check why a body is in the pressurized water area! That should not be. Maybe the pressure pump is contaminated with sand?
  • Position of the jet pump : The suction force of the jet pump depends directly on the suction head (see above). The discharge height should be less problematic for the jet pump than the suction head. It is therefore important to keep the suction head in the negative (!) Range: the diffuser of the jet pump should be below the water level of the suction container (e.g., feeders). Example: A gap with the jet pump is to be extracted and the material pumped into a bucket. The bucket is 1m above the suction point (only just covered with water). Poor solution: The jet pump is attached to the bucket, so the jet pump has to suck up a meter high. Good solution: The jet pump is at suction head, so the flow has to transport the material one meter high, which should not be a problem.
  • Adjusting the suction speed : You have the following options to adjust the amount of material to be sucked. These are:
    • Increase the pressure on the pressure side: If the jet pump is operated with only one pump (that is, driven by the volume pump), the main valve can be further rotated to increase the pressure in the discharge line to the jet pump
    • Use more powerful pressure pump: Trivial but always a possibility. Diaphragm pumps are particularly suitable as pressure pumps, but are also very expensive. Note that the pressure pump should deliver at least 5 liters per minute at working pressure (this is not the maximum water level of the pump!).
    • Open or close the valve of the pressure pump
    • Change the height of the jet pump to the inlet water level: If the jet pump is higher, the material flow will be reduced and the flow will be increased in the opposite direction (this should also not be a problem.)
    • Rotate the jet pump around its axis: If the suction port of the jet pump body points upwards, the material falls into the jet pump, which has a positive effect on the transport performance (possibly not on the suction quantity of water). If the suction connection points downwards, the material must be sucked into the jet pump. This reduces the transport power of the jet pump.
    • Increase the pump power: Check whether your power supply (battery) can supply the required current. A car battery provides sufficient power in any case. I would choose a power supply so that it provides about 50% more power than is needed. For example, if the pump current is 6 amperes, then the power supply should supply 6 * 1.5 = 9 amperes. At 12V, this would be a total of 9 amps * 12 volts = 108 watts. (Power = current * voltage). Check that the connection cables to the pump are sufficiently thick. If the cables are warm, they are too thin in any case! I would use at least 2 square millimeters of cable.
  • Material throughput : The material transport is dependent on the grain size of the material to be transported. The smaller the grain size, the easier the jet pump does. So if you want to get a lot of material, you should consider whether it does not go down from 2mm to 1mm grain size.

Modification of the jet pump

We recommend that you do not modify the beam pump we supplied, , but to drive it in the parameters specified by us. Of course, we do not guarantee the function of the jet pump if modifications have been made. However, if someone uses a pump that can deliver significantly more volume at high pressure (e.g., a good garden pump), the transport performance of the jet pump could be substantially increased by drilling the nozzle of the jet pump. At the moment, the nozzle size is 3mm, a maximum nozzle size of 5mm would still be possible without modification of the diffuser. Since the output of the jet pump depends directly on the amount of water injected at a given pressure, the capacity could be increased by increasing the amount of water. This is achieved by drilling the nozzle. One should proceed step by step, and increase the nozzle diameter in 0.5mm increments. Everything at your own risk, we gladly supply spare parts on request ;-). For special applications, they can appeal to me if they want to use a significantly larger diameter. Up to 50mm tube diameter we could produce jet pumps on request (which would be a 2 "Mini-Dredge) Here are some diameters in relation to the pressure on the pressure side as well as the water demand at this pressure The diameter of our nozzle is 3mm.

pump pressure nozzle diameter flow
0.5 bar 3.0 mm 3.2 L / min
0.5 bar 4.0 mm 5.8 L / min
0.5 bar 5.0 mm 9.0 L / min
1 bar 3.0 mm 4.6 L / min
1 bar 3.5 mm 6.2 L / min
1 bar 4.0 mm 8.2 L / min
1 bar 4.5 mm 10.3 L / min
1 bar 5.0 mm 12.7 L / min
2 bar 3.0 mm 6.5 L / min
2 bar 4.0 mm 11.5 L / min
2 bar 5.0 mm 18.0 L / min

The Comet Ocean pump delivers exactly 5 liters per minute at a bar pressure! This fits perfectly to the above table for 3mm nozzle diameter. Comet has a data sheet on the pump on its website!

Add to Cart:

  • Model: wama_010
  • Shipping Weight: 0.1kg
  • Manufactured by: Goldblitz

This product was added to our catalog on Friday 22 July, 2016.

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