Rotary Disc Divider.

What’s the benefit?

The Rotary Disc Divider (RDD):

  • Has a built-in dosing function in cases where the sampled material does not come in a continuous flow. The RDD thereby enables a more even distribution of material before division.
  • Is designed with steep angles to ensure smooth and reliable flow of sample material.
  • Has a compact design compared to a set-up with both a Dosing Conveyor and a Rotary Tube Divider.
  • Is made with multiple inspection panels making the RDD easy to maintain and inspect.
  • Has a stepless and precise adjustment of division ratio.
  • Is cost effective and easy to install and operate.

Find more of Mark & Wedell JAWO Sampling’s innovative sampling solutions here:

RDD Product Brochure.

To find out more about our Rotary Disc Divider (RDD) please feel free to
download product brochure:


Link to brochure

Jan Flemming Jørgensen

Sales Director

What does it do?

The Rotary Disc Divider (RDD) is designed for combined dosing and representative division of almost all types of bulk material e.g. minerals, powders, coal, cement, gravel and wood pellets.

The RDD is an improved version of the Turnstile Divider enabling a better and more continuous dosing and division of material from big bags or material arriving in batches/non-continuous flow. With its built in dosing function material is evenly distributed before division.

Variant 1
The Rotary Disc Divider Single (RDD-S) has one sample outlet in the bottom section.

Variant 2
The Rotary Disc Divider Multiple (RDD-M) have up to four sample outlets in the bottom section.

How does it do it?

The RDD consists of a top section housing with an upper disc and two scrapers, a center section with a lower disc and a scraper, a drive unit, a rotor which is connected to the scrapers, a bottom section with an adjustable sample outlet(s) and a reject outlet.

There are inspection hatches in both the upper and the center section.

The material is fed vertically to the RDD through the top section. In the top of the RDD, an upper disc is mounted, and the material is scraped off and directed towards an annular opening. This allows the right amount of material to fall to the lower disc, where the material is scraped down to the bottom section.

The division ratio may be adjusted between 1:9 and 1:56 dependent of RDD model and particle size. In the bottom section, the divided material is led through a manually adjustable outlet and the remaining material is led into the reject outlet.


What are the technical details?

Material type: Bulk materials.

Drive unit: Gear motor.

Sensors: Induction sensor.

Indicative Rotational speed: 20 rev/min.

Indicative Dimensions (LxWxH): 740x856x875 mm.

Indicative weight: 152 kg.

Housing material: Stainless Steel AISI 304/316 and/or painted galvanized mild steel.

Feed size/ particle size (input): Up to 30 mm.

Division ratio: Between 1:9 and 1:56.

Sample outlet opening: Adjustable between 0-160 mm through stepless adjustment.


  1. The M&W central control cabinet can exchange signals with the client’s control system.
  2. As an option the RDD can be installed with an air purging system for continuous cleaning of all three sections of the unit.
  3. As an option the RDD can come with a screen built into the inlet hopper for screening of unwanted materials not entering the unit.
  4. As an option the RDD can be made to accommodate ATEX requirements.

Nota Bene

Regarding surface treatment, the RDD can be made with all necessary surfaces to ensure that all material leaves the unit. Additionally, the RDD can be made to withstand abrasive materials as well as other material requirements.

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