Top 10 Features to Look for in a Modern Volumetric Filling Machine

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Fill accuracy is decided by the dosing principle, the product temperature and the condition of the seal, not by the number on the quotation.
Key facts at a glance
What is includedFilling, capping and closing equipment
Filling principlesGravity, volumetric, isobaric, piston, load cell
Capacity2,000-48,000 BPH by configuration
Accuracy basisVolume, weight or fill level
Contact materialSUS 304 product contact, CIP-ready
Key controlFill accuracy, closure integrity, CIP time

Which filling principle fits this product?

The product fixes the filling principle; output only fixes the size. Still liquid at a steady density runs gravity or volumetric; carbonated product needs isobaric; thick product with solids needs a piston; product sold by weight runs a load cell. Fix the product first; a machine chosen before it is a machine chosen twice.

How does the closure change the filler specification?

The capping head is built for one closure family. A screw cap, a crown and a ROPP cap need different heads, different heights and different checks. Changing closure after the line is ordered means a new head, and sometimes a new bottle finish, not a setting change.

PrincipleDoses byFails when
GravityFill level in the bottleBottle geometry varies
VolumetricChamber volumeValve seal wears
IsobaricVolume under counter-pressurePressure or temperature drifts
PistonDisplacementProduct carries solids
Load cellNet weightProduct temperature moves

Throughput and change-part lists are on the Gravity Filling Machine for Still Water page rather than in this note.

What does CIP take out of production time?

A CIP cycle is measured in tens of minutes to over an hour depending on the circuit and the soil. It is not production time, and a plan that counts it as production will miss its daily output every day. The number belongs in the capacity calculation, not in the shift handover.

Where this becomes a line rather than a single machine, the Volumetric Filling Machine for Still Water is the starting point.

How does the bottle neck finish change the machine?

The neck finish sets the rinser clamp, the filling valve seal and the capping head. A change of a millimetre in the thread is a change of change parts and often of the capper. It is the single most under-specified item in a filling line enquiry.

The same question is worked through from another angle in How to Choose Between Mechanical and Semi-Electric Fillers.

When is a second filler cheaper than a faster one?

When the formats are far apart or the cleaning regimes conflict. Two smaller fillers each run at their own rate and can be cleaned independently. One large flexible filler carries every changeover on the critical path, and its downtime is the plant downtime.

How to read the numbers. What the specification calls capacity is a reference range, not a tested output. The filler is rarely the constraint once changeover and CIP are counted. Plan on a factor of 0.65-0.85.

Frequently asked questions

What is the difference between volumetric and gravity filling?

Gravity fills to a level set by a tube, so accuracy depends on the bottle. Because volumetric filling doses by chamber volume, accuracy holds across bottle sizes. Gravity is simpler and cheaper; volumetric is more repeatable when the bottle changes.

Can one filler run different bottle sizes?

Yes, with change parts: star wheels, guide rails, grippers and a recipe. The parts are cheap compared with the changeover time, which is why most plants specify one dominant format.

What is a monoblock?

A single frame carrying the rinser, the filler and the capper, driven and controlled together. It removes two transfers and the floor space between three separate machines.

What spare parts should be kept in stock?

Valve seals, piston seals, capping head inserts, guide rail blocks and one set of change parts for the second format. These are the items that stop a line for days when they fail.

What is the difference between rated BPH and real output?

Rated BPH is a steady-state figure at one format. Real output subtracts changeover, CIP, label changes and downstream stops, which is why planning uses a factor of 0.65-0.85.

Key takeaways
  1. Fill accuracy is a temperature and wear question as much as a machine question.
  2. Each closure family needs its own capping head.
  3. Of everything in a line enquiry, the neck finish is the item most often left blank.
  4. One flexible filler is not always the cheaper answer; two small ones can be when the formats diverge.
About the author
Written by the Sunswell engineering team - led by Howie SUN, Founder & CEO, with 14 years in filling and blow-moulding equipment R&D and turnkey project delivery across 71+ countries.
Last reviewed: 2026-08-28 . Reviewed by Sunswell engineering team
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