Mechanical Speed Variators

Image of Mechanical Speed Variator

The MK series of mechanical speed variators is available in 7 sizes. It includes foot mounted, flange mounted, pump adapters and can integrate with any IEC motor or gearbox and can operate at zero speed. 

MK Series

The MK series mechanical variators provide trouble free, mechanical speed for a wide variety of applications, when AC inverters are not an option. No complicated electrical wiring, no wash-down problems, and no complex manual to study. Increasing or decreasing speed requires just turning a knob.

Standard output flanges allow easy mounting to your existing gearbox, motor, pump, or us one of SITI’s standardized gear solutions for a compact, reliable, cost effective solution.



  • Changes Speed without Complicated Wiring or Controls
  • Durable Heavy Duty Design
  • Quiet
  • Simple Operation
  • Bi-directional Rotation
  • Zero Speed Output with Motor Running


  • 7 Sizes
  • 200 Versions of mounting
  • Pump Flanges
  • Gearbox Flanges
  • Foot Mount


  • 0.5 – 15 HP input
  • Max torque = 26,550 lb. in. / 3,000 Nm
  • Differential Device provides Zero Speed


  • Pumps
  • Conveying
  • Agitators

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