Crown Gravity Separators

- Model GS18 - Gravity Separators



From farming to recycling, Crown gravity separators are used worldwide to improve the quality of the sample and separate efficiently by specific weight any granular type commodity that cannot be separated by screening (width), aspiration (weight) or indented cylinders (length). Through decades of experience building and using gravity separators, Crown can offer a tailored and cost effective solution that suits your needs. We take great pride in our work and consequently our separators are as renowned for their streamlined, space saving design, durability and engineering excellence as for their best in class separation capability. In addition to the Crown Gravity Separator range, which includes tailor made dust hoods, air slides & interchangeable decks, we also design and build elevators, conveyors and de-stoning equipment in-house, enabling us to offer the complete end-to-end solution to our customers.


From an inlet with an adjustable feed rate, the material is fed onto the gravity separator’s inclined reciprocating grading deck, which normally has a special woven wire mesh surface, except for extremely fine products, when a specialist fabric deck is used.

High volume, low pressure air is passed through the mesh from the fan, the amount of air available is readily adjusted to suit the product being processed. This adjustment is to ensure that the lighter product is lifted to the top of the material and the heavier product remains on the surface of the grading deck, resulting in stratification of product.


Due to the reciprocating motion of the inclined deck the heavy product will walk uphill to the highest side, whilst the lighter product will drift down towards the low side.

Simple adjustments in end tilt / side tilt / deck speed and volume of air passed through the product whilst the machine is running will dictate the nature of the separation and the throughput.

On Crown Gravity Separators all adjustments are readily and simply made whilst the machine is in use: this enables a combination of control adjustments to result in a very fine separation at the end of the machine, where the split will be made with adjustable knives or sliding chutes.

Crown Gravity Separators are used to improve the value of crop by rejecting a portion as necessary e.g. Hagberg improvement of milling wheat using a gravity separator as an integral part of a grain handling system. Gravity Separators are also used on all modern mobile seed processors.

Crown Gravity Separators are also used in recycling applications such as separating valuable or viable metals, granular polymers, chipped waste tyres & mineral, rock or soil types.

Crown Gravity Separators are used for the removal of impurities, admixture, insect damage and immature kernels in the following examples and many more thus producing a bold, uniform, vigorous, high germination sample.

  • Wheat
  • Barley
  • Oilseed Rape
  • Peas
  • Beans
  • Cocoa Beans
  • Linseed
  • Coffee Beans
  • Grass Seeds
  • Commercially Grown Vegetable & Plant Seeds

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