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Pumps

Gear pumps

Precise positive displacement pumps for highly viscous media, melts, oils and polymers — low pulsation, accurate and pressure-stable.

Gear pumps deliver volumetrically: two meshing gears trap the medium in the tooth gaps and move it from suction to discharge almost without pulsation. Flow stays constant even with varying back pressure — the prerequisite for exact metering.

We supply gear pumps from WITTE PUMPS & TECHNOLOGY GmbH among others: melt, chemical, extruder and booster pumps in stainless steel and special materials, heated and ATEX-compliant on request.

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Technical features

  • Low-pulsation, volumetrically constant delivery
  • Viscosities from thin liquids up to several million mPas
  • High differential pressures for extrusion and pelletising
  • Heated versions for melts and solidifying media
  • Bearings and seals matched to the medium
  • Stainless steel, hardened steels and special materials

Typical applications

  • Melt transfer in extrusion lines
  • Polymer, adhesive and resin metering
  • Chemical process engineering
  • Oil and lubricant transfer
  • Paints, coatings and printing inks
  • Fibre and nonwoven production

Gear pumps

Precise delivery for industry and process engineering

Gear pumps are among the most proven positive displacement pumps and are used wherever liquids must be delivered accurately, with low pulsation and high reliability. Their robust design and high metering accuracy make them suitable for numerous applications in the chemical, pharmaceutical, food, plastics and machinery industries.

Thanks to their compact construction, gear pumps handle both low-viscosity and high-viscosity media with high repeat accuracy. They are ideal for metering, transfer and circulation processes and offer long service life with low maintenance effort.

Typical applications

  • Chemical liquids
  • Oils and lubricants
  • Fuels
  • Paints and coatings
  • Adhesives
  • Resins
  • Polymers
  • Food and additives
  • Pharmaceutical products

Advantages of gear pumps

  • High delivery accuracy
  • Even, low-pulsation flow rate
  • Compact design
  • High operational reliability
  • Long service life
  • Suitable for low to high viscosities
  • Easy integration into existing plants

Melt pumps

Maximum process reliability in polymer extrusion

Melt pumps are developed specifically for conveying highly viscous plastic melts. They are mainly used in extrusion lines to ensure a constant mass flow and stable pressure build-up.

Using a melt pump relieves the extruder, which improves product quality and can increase the energy efficiency of the entire process. At the same time, pressure fluctuations are reduced and uniform material delivery is ensured.

Advantages of melt pumps

  • Constant pressure build-up
  • Improved product quality
  • Higher dimensional accuracy of end products
  • Lower pressure fluctuations
  • Relief for the extruder
  • Reduced energy consumption
  • Gentle delivery of temperature-sensitive polymers

Fields of application

Our melt pumps are used, among others, in:

  • Film extrusion
  • Sheet extrusion
  • Pipe and profile extrusion
  • Pellet production
  • Compounding lines
  • Polymer production
  • Recycling processes

Manufacturing quality

Thanks to the highest manufacturing quality, the pumps ensure reliable delivery even under extreme pressure and temperature conditions.

Chemical gear pumps

Reliable delivery of aggressive media

Chemical gear pumps are developed specifically for demanding chemical processes. They allow the safe and precise delivery of low to medium viscosity liquids, even when these are corrosive, abrasive or chemically aggressive.

A choice of materials, sealing systems and bearing designs allows optimal adaptation to individual process requirements.

Technical features

Sealing systems

  • Various mechanical seals
  • Magnetic couplings
  • Gland packings
  • Special seals for critical media

Materials

  • Stainless steel
  • Hastelloy
  • Titanium
  • Ceramics
  • Special coatings

Bearings

  • Carbon bearings
  • Ceramic bearings
  • Carbide bearings
  • Special materials

Connection options

  • DIN flanges
  • ANSI flanges
  • Special connections

Temperature control

  • Electric heating
  • Thermal oil heating
  • Steam jacket
  • Individual custom solutions

Areas of use

  • Chemical industry
  • Petrochemicals
  • Paint and coatings industry
  • Pharmaceutical industry
  • Cosmetics industry
  • Food technology
  • Specialty chemicals

Your advantages

We are happy to advise you on selecting the optimal gear, melt or chemical pump for your application and process requirements.

  • High chemical resistance
  • Precise metering and delivery
  • Flexible material selection
  • Long service life
  • Maintenance-friendly design
  • Individual customisation options
  • Maximum process reliability

Gear pumps for the food industry

Hygienic delivery of food and food additives

Gear pumps for the food industry are designed for gentle, precise and hygienic delivery of liquid and highly viscous media. Their robust construction and exact delivery characteristics make them ideal for production processes with high demands on product quality, process reliability and cleanability.

The pumps are used in numerous areas of food production and convey sensitive media almost without pulsation. The even delivery protects products and ensures consistent production quality.

Typical media

  • Vegetable oils
  • Margarine
  • Butterfat
  • Chocolate
  • Syrup
  • Honey
  • Molasses
  • Fruit concentrates
  • Sugar solutions
  • Flavourings
  • Glucose
  • Starch products
  • Dairy products
  • Food additives

Hygienic design for the highest requirements

All product-contacting components can be manufactured in food-grade materials. Smooth surfaces and hygienic designs minimise product residues and simplify cleaning and maintenance.

  • Stainless steel version
  • Heated version
  • Unheated version
  • Double-jacket version
  • CIP-capable designs
  • ATEX version for special applications

Heated gear pumps

For media that solidify or change viscosity at low temperatures, the pumps can be equipped with temperature control. This keeps products at the desired processing temperature during delivery so they can be transported reliably.

  • Electric heating
  • Thermal oil heating
  • Hot water heating
  • Steam heating

Advantages of food-grade gear pumps

  • Hygienic construction
  • Gentle product delivery
  • High metering accuracy
  • Constant flow rate
  • Low pulsation
  • High process reliability
  • Long service life
  • Easy cleaning
  • Individual adaptation to medium and production process

Application areas

Our food-grade gear pumps are used, among others, in:

  • Edible oil production
  • Margarine manufacturing
  • Confectionery industry
  • Chocolate production
  • Dairies
  • Beverage industry
  • Bakery industry
  • Production of food additives
  • Processing of flavourings and concentrates

Individual solutions for your application

Depending on the medium, temperature requirements and production process, we offer tailor-made gear pump solutions for the food industry. Our experts support you in selecting the optimal pump configuration for maximum efficiency, product protection and operational safety.

We are happy to advise you on choosing your food-grade gear pump for edible oils, fats, syrups, chocolate and other demanding media.

Gear pumps — designs and components

Helical gear sets with shafts — low-pulsation, precise delivery
Melt pump for extrusion — heatable casing with flange connections
Chemical gear pump: product flow and slip flows (tip, axial, flank clearance)
Hygienic food-grade gear pump in stainless steel with clamp connection

Gear pumps: constant flow for viscous media

Gear pumps deliver a geometrically defined volume per revolution through the tooth gaps. This yields their key property: flow is almost independent of back pressure and precisely controllable via speed. For metering, coating and extrusion tasks this is the decisive advantage over centrifugal pumps; the pumps overview classifies all designs.

External or internal gearing?

External gear pumps are compact, pressure-resistant and inexpensive – ideal for hydraulic oils and lubricants. Internal gear pumps run more quietly, tolerate higher viscosities and are superior at low speeds, for example with molasses, resins or bitumen.

  • No dry running – the medium is also the lubricant
  • Avoid solids: even fine sand destroys the running clearance
  • For hot media use heated jackets and adapted clearances
  • Provide a relief valve – displacement pumps build unlimited pressure

Related topics and brands

Direct links to the matching pump and nozzle categories as well as our distributor pages for Flojet, Delavan and Versamatic.

Frequently asked questions

Up to which viscosity do gear pumps work?
Depending on design and speed, gear pumps handle media from a few mPa·s up to several million mPa·s, such as polymer melts in extrusion. Highly viscous media require reduced speed and generous suction cross-sections.
Are gear pumps approved for food applications?
Yes, in hygienic stainless steel 1.4404 design with FDA-compliant seal materials, CIP-capable clearances and a low-dead-space construction.
Why low-pulsation delivery?
Gear pumps deliver volumetrically with virtually no pulsation – ideal for metering, coating and extrusion processes where a constant flow determines product quality.

Related pages

Pumps overviewCentrifugal pumpsImpeller pumpsNozzles overview