DYNATORQUE SD Declutchable Manual Overrides | Schlumberger
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DYNATORQUE SD

Declutchable manual overrides

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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
  • Transparent to valve operation when disengaged
  • Suitable for either double acting or spring return actuators
  • Nine frame and spur combinations that provide output torque from 3,000 to 140,000 lbf.in [340 to 15,815 N.m]
  • One-handed declutch mechanism
  • Declutchable override sandwich mounted between valve and actuator
  • Units are suitable for use in all handwheel applications with chainwheel adapters.

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 DYNATORQUE SD manual overrides to prevent engagement or disengagement

MODEL  Double-Acting Actuators
Maximum Valve Torque, lbf.in [N.m]		 Spring-Return Actuators
Spring-End Torque, lbf.in [N.m] 		 Override Maximum Torque Rating, lbf.in [N.m] Mech. Adv. Handwheel Size, in
 Rim Pull, lbf
 Hsg. Btm. Mounting Pattern
(Min. BCD/Tap)
 Hsg. Btm. Mounting Pattern
(Std. BCD/Tap)
 Hsg. Btm. Mounting Pattern
(Max. BCD/Tap) 		 Cov. Mounting Pattern
(Min. BCD/Tap)
 Cov. Mounting Pattern
(Std. BCD/Tap)
Cov. Mounting Pattern
(Std. BCD/Tap)
 Total Weight, lbm
DT3SD  2400 [271] 1100 [124] 3000 [339]  8.10  10 74 1.968-1/4-20
 2.756-(4)5/16-18
 4.016-3/8-16
 2.756-.344
 2.756-(4).344
 4.250-.406
 20
DT7SD  5600 [633]  2600 [294] 7000 [791] 12.96 14 77 3.250-3/8-16
 4.016-(4)3/8-16
 5.000-1/2-13
 3.750-.438
 4.016-(4).406
 5.000-.562
 28
DT12SD  9600 [1085] 4550 [503] 12,000 [1356] 13.68 24 73 3.750-3/8-16
 4.921-(4)1/2-13
 6.496-3/4-10
 4.750-.562
 4.921-(4).562
 6.496-.812
 45
DT21SD  16,800 [1898] 7775 [879] 21,000 [2373] 13.20 30 106 4.500-5/8-11
 5.512-(4)5/8-11
 7.000-3/4-10
 5.500-.562
 5.512-(4).688
 7.750-.812
 62
DT36SD  28,800 [3254] 13,330 [1506] 36,000 [4067] 13.25 36  151 6.000-1/2-13
 6.496-(4)3/4-10
 10.250-3/4-10
 6.000-.563
 6.496-(4).812
 10.000-.688
 130
DT40SD  32,000 [3616] 14,815 [1674] 40,000 [4519] 19.84 36 112 6.000-1/2-13
 6.496-(4)3/4-10
 10.250-3/4-10
 6.000-.563
 6.496-(4).812
 10.000-.688
 130
DT50SD  40,000 [4520] 18,520 [2093] 50,000 [5649] 34.45 36 81 6.000-1/2-13
 6.496-(4)3/4-10
 10.250-3/4-10
 6.000-.563
 6.496-(4).812
 10.000-.688
 168
DT54SD  50,400 [5695] 23,330 [2636] 63,000 [7118] 51.68 30 81 6.000-1/2-13
 6.496-(4)3/4-10
 10.250-3/4-10
 6.000-.563
 6.496-(4).812
 10.000-.688
 163
DT90SD  72,000 [8136] 33,325 [3766] 90,000 [10,169] 49.92 36 100 6.500-3/4-10
 10.000-(8)5/8-11
 11.750-3/4-10
 8.500-.688
 10.000-(8).688
 10.750-.812
 268
DT140SD  112,000 [12,655] 51,850 [5859] 140,000 [15,818] 78.00 36 100 6.500-3/4-10
 10.000-(8)5/8-11
 11.750-3/4-10 8.500-.688
 10.000-(8).688
 10.750-.812
 271

Notes

  • Handwheel and rim efforts shown are calculated at unit maximum torque rating.
  • 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.

Pneumatic LEDEEN Actuators

Linear and quarter-turn models

Reliably perform with compressed air, natural gas, or nitrogen actuator supply.

Hydraulic LEDEEN Actuators

Quarter-turn and linear designs

Achieve on-off modulating control of multiple valve types.
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Video Declutchable Manual Overrides

Used with pneumatic, hydraulic, and backdrivable electric actuators.

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