Quick answer
Fixed nozzles are simpler when a product can enter cleanly from one height. Diving nozzles move into or follow the container to reduce free fall, splash or foam and can support bottom-up filling. The benefit depends on the product, nozzle profile, container neck and required motion time.
Side-by-side comparison
| Decision factor | Fixed filling nozzle | Diving filling nozzle |
|---|---|---|
| Motion | No vertical nozzle movement during dose | Programmed vertical movement |
| Foam and splash | Relies on nozzle height and flow control | Can keep outlet near or below rising liquid |
| Cycle time | No motion time | Motion adds time but may allow faster product flow |
| Container access | Works where one height clears the range | Requires neck entry, alignment and stroke |
| Stringing | Cut-off design remains critical | Withdrawal profile can help or worsen strings |
| Control | Simpler valve timing | Valve and axis position must be synchronised |
| Cleaning | Fewer moving seals or guides | Moving components and guards need cleaning access |
| Risk | High free fall on tall containers | Nozzle collision or contamination if alignment is poor |
Decision checks
- Foam, splash and aeration sensitivity
- Container height and neck range
- Nozzle diameter and entry clearance
- Bottom-up or submerged-fill need
- Axis speed, stroke and collision protection
- Nozzle cut-off and withdrawal profile
- Cleaning and changeover access
How to prove the choice
Use the tallest narrowest-neck container and the most foamy or stringing product. Film the fill and withdrawal in slow motion and compare stable good output, not only foam height.
Relevant specialist route
View the solutionautomaticfillingmachines.co.ukAutomatic Filling Machines
Automatic filling routes with nozzle, container and flow profiles matched to the product.
Selection note: Do not select from a comparison table alone. Test representative product and packaging against a written acceptance plan.