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Alvan Blanch Gravity Separator


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Seed Cleaning – removal of immature/low germinations/insect damaged seeds from’ beans, peas, maize, sunflower, cereals, linseed, oil seed rape, herbage seed, vegetable seeds etc.


  • Quality separation according to differential in specific weight
  • Simultaneously removes both light and heavy impurities
  • Suits a wide range of applications – most free flowing materials
  • Pressure or vacuum models available
  • Industrial duty – Compact design – Easy maintenance


Designed for efficient operation and ease of setting. Adjustable valves control the heavy, middling and light product outlets. Adjustable sections include: Side tilt, End raise, Deck speed, Fan speed and Air flow.


For the grading by specific weight of products with very slight differences in size and/or weight, which cannot be separated by screening (width), aspiration (weight) or by indented cylinders (length).

The separator works on a fluidised bed principle; air is forced through the deck causing the light fraction to float above the heavy fraction. The deck is reciprocated causing the heavy fraction to move uphill, while the light fraction floats downhill. Variations in deck speed, air volume, deck material, deck angle (length wise and side wise), and take-off points allow effective separation to be achieved on almost any dry product. 


  • Vibratory feed
  • Full (or partial) dust extraction hood for dusty products
  • Alternate decks to suit range of seeds to be processed
  • Separate dust tight control panel, all pre-wired and incorporating mains isolator, deck drive inverter, fan drive inverter and starters


Seed Cleaning

Removal of immature/low germinations/insect damaged seeds from’ beans, peas, maize, sunflower, cereals, linseed, rapeseed, herbage seed, vegetable seeds etc.

Commercial Cleaning

Improving quality of milling wheat and rye, malting barley, ergot removal etc.

Food Processing

Coffee, lentils, herbs, spices etc.

Industrial Applications

Recycling of plastics, metals etc.


Alvan Blanch Development Co. Ltd.

Country:  United Kingdom

British manufacturers with a global outlook. With 70 years’ engineering experience, we specialise in innovative design, production and installation of high-quality machines and integrated systems for the processing of agricultural produce and waste materials.

Our mission was first established by Alvan Blanch OBE himself: to use our experience and expertise to address, and find solutions for, the agricultural and environmental challenges of our ever-changing world – focusing on processing food more efficiently, and making better, safer use of our waste materials. It has been many years since Alvan Blanch OBE set out his mission, but our enterprise continues to grow and adapt to meet international demand for food and waste processing whilst keeping our mission at the forefront of our business.

Product categories:

Coffee processing machines

Countries to which the seller delivers his products:

All countries


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