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Spiral Classifiers

The Spiral Classifier is available with spiral diameters up to 120″. These classifiers are built in three models with 100%, 125% and 150% spiral submergence with straight side tanks or modified flared or full flared tanks. All sizes and models are available with single-, double- or triple-pitch spirals.


  • Fabricated and reinforced tank construction with heavy gauge steel

    Adjustable weirs for classification control

  • Heavy duty and large diameter seamless tubular shaft designed for minimum deflection
  • Submerged bearing assembly fitted with heavy duty dual roller bearings in a special housing provided with multi layer labyrinth and oil seal protection against ingress of foreign material
  • Front end spherical & roller bearing combination assembly in a special housing provided with oil seals against dust ingression
  • Ruggedly built spiral flights welded to spider arms and protected by abrasion resistant wear liner segments fastened by counter sunk head bolts; the whole assembly designed for a durable and long life
  • Hoisting arrangement for lifting spiral assembly on the submerged bearing side to prevent clogging and for periodic inspection
  • Simple drive train consisting of shaft mounted gear reducer fitted on front end of spiral shaft, V-belts and electric motor
  • Entire drive and front end bearing assembly mounted on a pivoted base such that the spiral assembly can be raised and lowered
  • Electronic frequency controller for step less speed variation of spiral rotation, for setting the classification mesh (optional).
  • A packaged free standing support frame of simple construction and easy installation
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