Rotork IW Mk2 - Quarter-Turn Worm Gearbox

Brand: Rotork PLC

The new IW Mk2 worm gear operators have been designed to suit isolating duty motorized applications.

The gearboxes include low lead angle gearing designed to be inherently self-locking, and offer an increased torque output per size compared to the previous IW range

IW Mk2 worm gear operators are quarter-turn devices intended for the operation of ball, plug and butterfly valves.

21 sizes. IW3 to 13 torque range up to 203,000 Nm (149,725 ft lbs).

4 sizes. IW14 to 17 torque range from 250,000 Nm to 850,000 Nm (184,391 ft lbs to 626,927 ft lbs).
  • Comprehensive gear ratios combined with a selection of auxiliary input spur gear reducers
  • Inherently self-locking gearing
  • Angular contact bearings supporting worm shaft
  • Removable and repositionable output sleeve
  • Repositionable baseplate facility
  • Options include:
    • High and low temperatures
    • All types of environment
    • Flexible extensions



Operating Temperature

  • -40° to 250° F (-40° to 120° C)

Environmental Protection

  • IP67
  • IP68

Approvals & Certifications

  • ATEX

Case Material

  • Gearcase & Reducer Gearcase: SG Iron

Worm Shaft Material

  • Protected Steel

Material of Construction

  • Baseplate, Quadrant: SG Iron
  • Baseplate: Cast Iron
  • Position Indicator, Output Sleeve, Reducer Gearing: Steel

Flange Material

  • Input Flange: SG Iron

Seal Material

  • Nitrile Rubber

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