• Overview
  • Specifications
  • Related Products

Overview

Our DYNATORQUE SD declutchable manual overrides are used with pneumatic, hydraulic, and backdrivable electric actuators. These products are sandwich mounted as part of an automated valve package to provide manual operation of the automated valve if a loss of plant air supply, power gas, hydraulic fluid power, or electricity occurs.

  • Standard ISO 5211 mounting dimensions on top and bottom flanges or custom machined for mounting to actuator and valve
  • Transparency to valve operation when disengaged
  • Suitability for either double-acting or spring-return actuators
  • Nine different frame and spur combinations provide output torque from 3,000 to 140,000 in.lbf [340 to 15,815 N.m]
  • One-handed declutch mechanism
  • Suitability for use in all handwheel applications with DYNATORQUE valve accessories
The declutch mechanism is designed to mount between the valve and its primary driving mechanism. The declutch locks in both the engaged and disengaged positions.

We offer a locking device for the DYNATORQUE SD manual overrides to prevent engagement or disengagement.

Specifications

Model  Double-Acting Actuator
Maximum Valve Torque,
in.lbf [N.m]
Spring-Return Actuators
Actuator Spring End Torque,
in.lbf [N.m] 
Override Maximum Torque,
in.lbf [N.m]
Mechanical
Advantage
Handwheel
Size, in
Rim
Pull, lbf
DT3SD  2,400 [271] 1,100 [124]
3,000 [339]  8.10  10 74
DT7SD  5,600 [633]  2,600 [294]
7,000 [791]
12.96 14 77
DT12SD 
9,600 [1,085]
4,550 [503]
12,000 [1,356]
13.68 24 73
DT21SD 
16,800 [1,898]
7,775 [879]
21,000 [2,373]
22.50 30 62
DT36SD 
28,800 [3,254]
13,330 [1,506]
36,000 [4,067]
19.00 36  105
DT40SD 
32,000 [3,616]
14,815 [1,674]
40,000 [4,519]
27.60 36 81
DT50SD 
40,000 [4,520]
18,520 [2,093]
50,000 [5,649]
60.80 36 46
DT54SD 
50,400 [5,695]
23,330 [2,636]
63,000 [7118]
91.20 20 69
DT90SD 
72,000 [8,136]
33,325 [3,766]
90,000 [10,169]
49.92 36 100
DT140SD 
112,000 [12,655]
51,850 [5,859]
140,000 [15,818]
78.00 36 100


Model  Housing Bottom
Mounting Pattern
(Min. BCD/Tap)
Housing Bottom
Mounting Pattern
(Std. BCD/Tap)
Housing Bottom
Mounting Pattern
(Max. BCD/Tap)
DT3SD 
1.968–1/4–20
2.756–(4)5/16–18
4.016–3/8–16
DT7SD
3.250–3/8–16
4.016–(4)3/8–16
5.000–1/2–13
DT12SD
3.750–3/8–16
4.921–(4)1/2–13
6.496–3/4–10
DT21SD 
4.500–5/8–11
5.512–(4)5/8–11
7.000–3/4–10
DT36SD
6.000–1/2–13
6.496–(4)3/4–10
10.250–3/4–10
DT40SD
6.000–1/2–13
6.496–(4)3/4–10
10.250–3/4–10
DT50SD 
6.000–1/2–13
6.496–(4)3/4–10
10.250–3/4–10
DT54SD 
6.000–1/2–13
6.496–(4)3/4–10
10.250–3/4–10
DT90SD
6.500–3/4–10
10.000–(8)5/8–11
11.750–3/4–10
DT140SD
6.500–3/4–10
10.000–(8)5/8–11
11.750–3/4–10

Model  Cover Mounting
Pattern
(Min. BCD/Tap)
Cover Mounting
Pattern
(Std. BCD/Tap)
Cover Mounting
Pattern
(Max. BCD/Tap)
Total Weight, lbm
DT3SD 
2.756–0.344
2.756–(4) 0.344
4.250–0.406
20 
DT7SD
3.750–0.438
4.016–(4) 0.406
5.000–0.562
28 
DT12SD 
4.750–0.562
4.921–(4) 0.562
6.496–0.812
45 
DT21SD
5.500–0.562
5.512–(4) 0.688
7.750–0.812
62 
DT36SD
6.000–0.563
6.496–(4) 0.812
10.000–0.688
130 
DT40SD 
6.000–0.563
6.496–(4) 0.812
10.000–0.688
130 
DT50SD 
6.000–0.563
6.496–(4) 0.812
10.000–0.688
168 
DT54SD 
6.000–0.563
6.496–(4) 0.812
10.000–0.688
163 
DT90SD 
8.500–0.688
10.000–(8) 0.688
10.750–0.812
268 
DT140SD
8.500–0.688
10.000–(8) 0.688
10.750–0.812
271 

Handwheel and rim efforts shown are calculated at unit maximum torque rating. In the event that different handwheel and rim effort combinations are desired, please use the following formulas or contact us for assistance. 

  • 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.

The DT50SD and DT90SD have a 4:1 spur assist. DT54SD and DT140SD have a 6:1 spur assist.

Handwheels listed are recommended sizes to produce full rated torque with rim effort listed.

Standard mounting patterns on all units are per ISO 5211 (UNC) specifications.

Please consult Cameron for special bore treatments, metric threads or other nonstandard configurations.