Quarter-turn severe-service gear operator

close up of multiple gears

Our DYNATORQUE DT quarter-turn severe-service stainless steel gear operators are designed for use with valves and dampers as well as most other quarter-turn applications requiring a self-locking mechanism.

For aggressive environmental conditions or corrosive applications, these operators have external components constructed of cast CF-8M stainless steel. They are completely sealed and are ideal for applications such as brewing, food processing, leaching operations, offshore platforms, and pulp and paper plants.

These gear operators feature stainless steel internal parts. DT21 is suitable for use with chainwheel operators. DT3 and DT7 are not suitable for chainwheel operation. (These actuators are not recommended for use with handwheels over 18-in diameter and are not recommended for use with any of our chainwheel options.

Materials unit housings, covers, indicators, gears, and bolting hardware are 300 series stainless steel. Optional seal materials and grease are available upon request.

DYNATORQUE Quarter-Turn Stainless Steel Gear Operators


Model Unit Weight, lbm Max. Output Torque, lbf.in Gear Ratio Turns for 90° Std. Output Bore Std. Key Size, in × in Std. Mounting Pattern (Qty. and Size) Std. Mounting Pattern (Bolt Circle) Mech. Adv. Handwheel Size, in Approx. Rim Pull, lbf
DT3  8 4500 30:1 7.5 1.000 0.250 (4)3/8-16 3.250 8.10 14 80
DT7  14 10,000 48:1 12 1.750 0.375 (4)1/2-13 5.000 12.96 18 86
DT21 33 26,000 60:1 15 2.500 0.500 (4)5/8-11 5.512 13.20 36 109


  • Handwheels listed are recommended sizes to produce full rated torque with the rim effort listed.
  • Bores, keyways, and mounting patterns listed are for Cameron standard stocking units.
  • Standard mounting patterns on the DT2 and DT5 are four tapped holes straddling centerline at 45°.