DYNATORQUE SRD Nondeclutchable Manual Overrides | Schlumberger
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DYNATORQUE SRD

Nondeclutchable manual overrides

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Our DYNATORQUE SRD nondeclutchable 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
  • For spring-return applications only
  • Eleven different frame and spur combinations for output torque from 3,000 to 260,000 lbf.in [340 to 29,375 N.m]
  • Select frame sizes available with chainwheel option for spring-return actuators in overhead locations
  • Nondeclutchable override sandwich mounted between valve and actuator

Model Spring-Return Actuator
Actuator Spring-End Torque, lbf.in [N.m]
 Override Max. 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
(Max. BCD/Tap)
 Total Weight, lbm
DT3SRD 1,111 [126] 3,000 [339] 8.10 10 74 1.968/4-20
 2.756-(4)5/16-18
 4.016-3/8-16
 2.756-.344
 2.756-(4).344
 4.250-.406
 19
DT7SRD 2,593 [293] 7,000 [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
 27
DT12SRD 4,444 [502] 12,000 [1356] 13.68 24 73 3.750-3/8-16
 4.016-(4)3/8-16
 6.496-3/4-10
 4.750-.562
 4.921-(4).562
 6.496-.812
 45
DT21SRD 7,778 [879] 21,000 [2373] 22.50 30 62 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
DT36SRD 13,333 [1506] 36,000 [4067] 19.00 36 105 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
 126
DT40SRD 14,815 [1674] 40,000 [4519] 27.60 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
 126
DT50SRD 18,519 [2092] 50,000 [5649] 60.80 36 46 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
 154
DT54SRD 23,330 [2636] 63,000 [7118] 91.20 20 69 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
 151
DT90SRD 33,333 [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
 258
DT140SRD 51,852 [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
 261
DT200SRD 74,074 [8369] 200,000 [22,597] 150.00 36 74 10.000-5/-11
 14.016-(8)1-1/8-7
 15.500-1-8
 12.450-.688
 14.016-(8)1.188
 15.000-1.188
 724
DT260SRD 96,296 [10,880] 260,000 [29,376] 264.00 30 66 10.000-5/-11
 14.016-(8)1-1/8-7
 15.500-1-8
 12.450-.688
 14.016-(8)1.188
 15.000-1.188
 764

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.
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Video Nondeclutchable Manual Overrides

Used with pneumatic, hydraulic and backdrivable electric actuators

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