Piston Pump Liquid Filling Machine

Description & Operating Principle

HMEC’s Piston Pump Liquid Filling Machines utilize high-torque positive displacement piston cylinders paired with 3-way rotary sanitary valve blocks. During the intake stroke, the piston retracts inside a heavy-duty cylinder barrel, creating a powerful vacuum that draws dense, viscous product directly from an overhead hopper or bulk holding tank. During the discharge stroke, the valve switches flow to the discharge nozzle, pushing the thick mass with controlled positive pressure into containers.

Available in pneumatic, mechanical crank, and multi-axis servo-driven executions, our piston fillers handle challenging non-free-flowing pastes, stringy gels, and temperature-sensitive liquids without product shear or cavitation.

Target Products & Applications

Piston fillers excel where standard gravity or flowmeter systems struggle due to high fluid viscosity:

🧴 Cosmetics & Personal Care

Body lotions, face creams, moisturizing gels, hair conditioners, foundation creams, and scrubs.

🍯 Food & Culinary Pastes

Honey, tomato ketchup, mayonnaise, chocolate sauce, peanut butter, cheese spreads, and jams.

💊 Pharma Ointments & Gels

Antiseptic creams, petroleum jelly ointments, pain relief gels, medicated pastes, and topical balms.

🧪 Chemical & Industrial Pastes

Industrial grease, sealants, silicone adhesives, liquid waxes, polishing compounds, and resins.

Pros & Cons Comparison

✅ Advantages (Pros)

Maximum Suction & Extrusion Power: Effortlessly fills pastes, thick creams, and heavy gels up to 100,000+ cPs.
Handles Particulates & Suspensions: Specially engineered rotary valves allow fruit pulp, particles, and chunks.
Positive Cut-Off & Clean Snap: High-speed shut-off nozzles eliminate tailing and strings on thick products.
Heated & Jacketed Hopper Options: Keeps hot-fill ointments and waxes liquid during bottling.
High Volumetric Precision: Positive displacement stroke guarantees repeatable ±0.5% fill accuracy.

⚠️ Considerations & Limitations (Cons)

Slower Cycle Time for Heavy Gels: Viscous intake stroke requires controlled draw speed to prevent cavitation.
Mechanical Cylinder Seal Wear: Heavy sliding contact requires periodic replacement of Teflon/Viton piston seals.
Larger Cleanout Cycle: Hopper, valve manifold, and piston body require thorough flushing between distinct batches.

Type & Range of Piston Pump Machines

On basis of automation & heads

✅ Semi-Automatic Tabletop Piston Filler (Single Head)
✅ Semi-Automatic Twin Head Piston Filling Machine
✅ 2 Head Automatic Inline Piston Filler
✅ 4 Head Automatic Inline Piston Filler
✅ 6 Head Automatic Inline Piston Filler
✅ 8 Head High-Speed Automatic Piston Filler

On basis of drive system

✅ Pneumatic Cylinder Driven Piston Stroke
✅ High-Torque Servo Motor Driven Piston Stroke
✅ Mechanical Cam & Crank Shaft Drive

On basis of options

✅ With Jacketed Heated Product Hopper (Electric/Steam)
✅ With Slow-Speed Hopper Agitator / Scraper
✅ With Diving Nozzle & Positive Blow-off
✅ With Inline Checkweigher & Auto-Rejection

Heavy-duty SS 316 / SS 316L contact parts suitable for pharmaceutical and food grade pastes
Independent stroke and speed control for intake and discharge cycles
Specialized positive shut-off nozzles prevent stringing, dripping, and trailing of viscous gels
Available with heated conical hopper (up to 90°C) and motor-driven scraper agitator
"No Bottle - No Fill" interlock system eliminates accidental machine discharge
Pneumatic checkweigher rejecter automatically rejects under-filled or over-filled containers
Tool-less quick-release tri-clamp fittings for fast cleanout and seal inspection
Supported by over 40 years of precision packaging engineering expertise

Output / Speed	15 to 120+ Bottles/Jars Per Minute depending on viscosity and volume
Filling Range	10 ml to 5000 ml (With modular interchangeable piston cylinder sizes)
Dosing Accuracy	± 0.5% to ± 1.0% (Product viscosity dependent)
Viscosity Range	1,000 cPs to 120,000 cPs (Liquid lotions, creams, pastes, heavy gels)
Number of Heads	Single, 2, 4, 6, 8 Heads (Inline automatic or semi-automatic tabletop)
Hopper Capacity	30L, 50L, 100L, 200L (Single wall, Jacketed heated, or with paddle stirrer)
Material of Construction	AISI 316L Contact Parts, AISI 304 Outer Structural Cladding
Control System	PLC with Color Touch Screen HMI and recipe storage
Power Requirement	415V / 3 Phase / 50Hz (Customizable for 220V/110V single phase)
Air Supply	6 Bar Dry Compressed Air

The following format change parts are available for switching container geometries and fill volumes:

Interchangeable SS 316L Piston & Cylinder Barrels
Rotary Sanitary 3-Way Valve Assemblies
Nozzle Tips with Mesh Diffusers (Anti-Stringing)
Jar / Bottle Infeed Guiding & Clamping Gates
Teflon / Viton / Food-Grade Silicone Seal Kits
Conical Product Hopper Attachments & Agitator Blades

How does a piston filler prevent honey or cream from dripping?

We utilize pneumatically actuated positive cut-off nozzles combined with a suck-back piston stroke that pulls the last drop of viscous paste cleanly back into the nozzle orifice upon cycle completion.

Can this machine fill products with soft chunks or fruit pieces?

Yes, our heavy-duty rotary valve blocks feature open-throat ports that allow suspended fruit pieces, seeds, and cosmetic beads to pass through without crushing or shearing.

Why is a heated jacket hopper recommended for ointments and balms?

Wax-based balms and petroleum jelly solidify at ambient room temperatures. A heated water/steam jacketed hopper keeps the product in a molten liquid state for smooth, uniform dosing into jars and tins.

Is this machine compatible with wide-mouth jars and plastic tubs?

Yes, HMEC piston fillers easily handle narrow-neck bottles, wide-mouth cosmetic jars, squeeze tubes, and thermoformed plastic tubs with simple conveyor guide adjustments.