• Overview
  • Specifications
  • Related Products

Overview

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

To accommodate aggressive environmental conditions or corrosive applications, these gear 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.

DYNATORQUE DT gear operators feature all stainless steel internal parts. The DT21 model is suitable for use with chainwheel operators. DT3 and DT7 models 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 also available.

Specifications

Model Unit.
Weight,
lbm
Max. Output
Torque, in.lbf
Gear
Ratio
Turns for
90°
Standard.
Output
Bore, in
Standard
Key Size,
in2
DT3  8 4,500 30:1 7.5 1.000 0.250
DT7  14 10,000 48:1 12 1.750 0.375
DT21 33 26,000 60:1 15 2.500 0.500

  

  

Model  Standard Mounting
Pattern Quantity
and Size, in
Standard Mounting
Pattern
(Bolt Circle), in
Mech.
Adv.
Handwheel
Size, in
Approx.
Rim 
Pull, lbf
DT3
Four 3/8–16
3.250 8.10 14 80
DT7
Four 1/2–13
5.000 12.96 18 86
DT21
Four 5/8–11
5.512 13.20 36 109


Handwheels listed are recommended sizes to produce full rated torque with the rim effort listed. The formulas listed below will assist you in determining alternate handwheel sizes and rim pull requirements based on your application.

  • To find handwheel diameter for given output torque at a given rim effort, divide the output torque by the mechanical advantage and multiply the result by 2. Then divide this result by the handwheel rim effort.
  • To find rim effort for a given output torque with a given handwheel diameter, divide the output torque by the mechanical advantage and multiply the result by 2. Then divide this result by the handwheel diameter. Handwheels are not included as part of the operator part list or price. 

Bores, keyways, and mounting patterns listed are for Cameron standard stocking units. Please consult Cameron for special bore treatments, costs, and deliveries.