Knowledge centre · Selection · 2026-09-17

Pump head selection: lobe, wing and progressive cavity geometries compared

Rotor pump head geometry directly affects particle handling, shear, cleanability and pulse. Here is how each type performs and when to choose it.

Choosing a filling machine is a structured process: start with product data, then container, output and accuracy, and end with pump type and supplier shortlist.

What to consider

Viscosity, particles, temperature and foaming behaviour narrow the pump type.
Container format and fill range decide frame, nozzle and conveyor design.
Output per shift determines semi-auto vs fully automatic.
Every shortlisted machine must be confirmed by a test fill on your actual product.

Common pitfalls

Choosing equipment before defining the product matrix.
Accepting accuracy claims without specifying product conditions.

Questions to ask your supplier

What is the widest and narrowest fill volume?
What accuracy is needed per product, and how is it measured?

Rotor pump heads come in several lobe geometries — three-lobe, twin-lobe, wing and progressive. Each suits different product types, viscosity ranges and particle sizes.

Facts used in this article: filling accuracy ±0.5% (error ≤1 g) for pure liquids and homogeneous products (error ≤1 g); measured ±1 g to ±2 g (measured) on products with particles, high viscosity or non-uniform texture (the actual value depends on product state, particle size and density uniformity); viscosity coverage ≈50–300,000 cSt; GTX series fill range 5–300,000 ml. These are the published manufacturer figures also stated on our specifications page.

Questions about this topic for your own product? wangaiguo@grountonpak.com · Tel +86 133 9317 7755

Built for your product — Grounton Pak

Grounton Pak (Hebei Guangteng Machinery Equipment Co., Ltd., brand GROUNTON) has built metering-grade rotor pump filling machines since 2013 — more than 40,000+ units delivered, with ±0.5% filling accuracy for pure liquids and measured ±1 g to ±2 g (measured) on particle-containing or high-viscosity products, CIP-capable hygienic construction and custom filling lines.

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Email: wangaiguo@grountonpak.com · WhatsApp: +86 133 9317 7755