Piston filling
Review chamber refill and valve passage.
Read the guide →Product-feed selection
Should a paste filler be hopper-fed or pump-fed?
Use direct hopper feed when the product can be loaded near the filler and refills the dosing path consistently. Use pump feed when product must travel from a vessel, drum or upstream process, provided suction, pressure, controls, hold-up and cleaning are proven with the real product.
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Comparison
The feed route must keep the dosing method supplied without changing the product.
Feed and dose cannot be assessed separately. An accurate cylinder or pump cannot deliver a stable result if product arrives aerated, starved, over-pressurised, too cold or inconsistently mixed.
| Consideration | Direct hopper feed | Pump-fed supply |
|---|---|---|
| Product source | Loaded or transferred close to the filler. | Remote vessel, drum, pail or upstream process. |
| Primary control | Hopper level, head and refill access. | Demand, pressure, flow, permissives and fault response. |
| Product risk | Splashing, settling, cooling or manual handling. | Starvation, shear, pressure, recirculation and additional hold-up. |
| Cleaning | Hopper, valves, chamber and nozzle. | All hopper/dose parts plus pump, hoses, fittings and source connection. |
Buyer question
What is hopper-fed paste filling?
Hopper-fed filling places a product reservoir above or close to the dosing mechanism so gravity and local head help supply the chamber or pump. It can be easy to inspect and suitable for smaller batches, provided the product remains uniform and enters the dosing path reliably.
Hopper geometry, outlet size, level variation, heating or agitation and the method used to replenish product should be included in the trial.
Buyer question
What is pump-fed paste filling?
Pump-fed filling uses a transfer pump or pressurised source to move product from a separate vessel or container to the filler. It can reduce manual loading and connect a production process to the line, but it adds another machine and product path that must be controlled, cleaned and accepted.
Specify source vessel, distance, height, product condition, pump principle, maximum pressure, demand logic and what happens when the filler stops.
Buyer question
When is direct hopper feed sufficient?
Direct hopper feed is sufficient when the batch can be loaded safely, the product remains in the required condition, the outlet does not bridge or starve, and level changes do not create unacceptable variation. It is often attractive where batches are short and product recovery or easy strip-down matters.
Prove the lowest normal level, longest pause and normal replenishment method. A full hopper demonstration does not test the condition at the end of a batch.
Buyer question
What new risks come with transfer-pump feeding?
Pump feed can introduce air, heat, shear, pressure, pulsation, recirculation, extra retained product and more complex cleaning. A pump may also continue to pressurise a closed filler unless permissives and relief or control measures are correct.
The application and site risk assessment should define safe limits and fail states. Product trials should include stop/start and starvation conditions that can occur in production.
Buyer question
How should both routes be compared in a trial?
Use the same product, dose, pack and acceptance method. Record fill results, temperature, air, particle condition, nozzle presentation, refill stability, product left in the path and cleaning effort for each route.
The winning route is the one that maintains accepted product and pack quality across the full run, not simply the one that moves product fastest during an open discharge.
Related questions and guides
Continue the specification with the next practical decision.
Use the related pages to connect this answer to product trials, machine selection and a quotation-ready application.
Pump filling
Review positive-displacement pump options.
Read the guide →Line integration
Define feed-demand and fault interfaces.
Read the guide →Need to compare a hopper with a transfer-pump route?
Send the product source, distance, vessel details, batch size, temperature, cleaning method and line sequence so the complete feed-and-dose system can be reviewed.