Multi-Spigot Hydrosizer


The MEP Multi-Spigot Hydrosizer is a multi-celled hindered settling classifier. Units with up to 10 cells have been supplied for numerous application.

Its operation is controlled by two factors:

  • An evenly distributed flow of upward current water.
  • Electronically controlled automatic discharge valves.

The quantity of water used is regulated to support a required size of particle in suspension; thus creating a 'column of teeter' within each cell enabling it to produce a number of discrete products of close graded particles.

A supply of upward current water at constant volume and pressure is essential for the successful operation of the Hydrosizer. It is preferable to have a head tank approximately 7 metres above the Hydrosizer to provide water to a common distribution pipe. Separate branches provide the upward current water to each cell, individually controlled by a valve in conjunction with a flow meter.

The Teeter Plates evenly distribute the upward current water within each cell to give a controlled and steady condition within the vessel, ensuring optimum performance.

The discharge valves are controlled by an electronic system that monitors the variations in density within each cell; as the density increases the discharge valve progressively opens and as the density decreases the discharge progressively closes. Thus a constant condition can be maintained in each cell.

This creates a situation whereby controlled classification takes place and gives immediate response to any variation in the feed material.


The Multi-Spigot Hydrosizer is ideal for treating a feed material containing a mixed range of sizes and converting it into a number of close graded and discrete sizes.

Where the feed consists of material with a common specific gravity the classification will be strictly by size.

Where the feed consists of material with more than one specific gravity then it is possible to combine particles of one specific gravity with different sized particles of another specific gravity thus preparing material for further treatment in gravity concentration devices such as shaking tables.

The Multi-Spigot is used in the production of:Close graded sands for:

  • Glass manufacture
  • The Foundry Industry
  • Water Filtration

Minerals such as:

  • Tin Ores
  • Lead Ores
  • Zinc Ores
  • Mineral Sands


The feed slurry should be pre-screened to prevent oversize material entering the vessel and de-slimed and concentrated to approximately 50% solids w/w.

The feed enters the machine via the feed chamber where an initial sorting takes place thus the first cell is relieved of the turbulent effect of the entering feed.

The slurry overflows from one cell to the next with the particles becoming progressively finer. The overflow from the final cell contains the finest material together with excess water.

The upward current water requirements (creating a column of teeter) will depend on the duty required, but is usually between 0.9 and 2.25m3/hr per tonne of dry solids treated. According to particle size and specific gravity.


  • Accurate classification of mineral particles.
  • Low running and maintenance costs.
  • Low energy requirement.
  • Purpose designed to suit each duty.
  • Compact design that minimises headroom requirements.
  • Fully automatic and adjustable electronic controls.
  • Proven performance - worldwide.
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