Pneumatic LEDEEN Actuators
Linear and quarter-turn models
Reliably perform with compressed air, natural gas, or nitrogen actuator supply.
Dynatorque SD
Declutchable manual override
Overview
Dynatorque SD™ declutchable manual overrides are used with pneumatic, hydraulic and backdrivable electric actuators.
Applications
Sandwich mounted between the valve and its primary driving mechanism as part of an automated valve package, the override enables manual operation of the automated valve in the event of a loss of plant air supply, power gas, hydraulic fluid power, or electricity. We also offer a locking device for these overrides to prevent unintended engagement or disengagement.
Benefits
Enhanced operational safety and reliability
Features
- 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
- Compatibility with both double-acting and spring-return actuators
- Nine frame and spur combinations that provide output torque ranging from 3,000 to 140,000 lbf.in [340 to 15,815 N.m]
- One-handed declutch mechanism
- Suitable for all handwheel applications with chainwheel adapters
Tech Specs
| 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] | Mechanical Advantage | Handwheel Size, in |
Rim Pull, lbf |
Housing (Bottom) Mounting Pattern (Min. BCD*-Tap), in |
Housing (Bottom) Mounting Pattern (Standard BCD-Tap), in |
Housing (Bottom) Mounting Pattern (Max. BCD-Tap), in |
Cover (Top) Mounting Pattern (Min. BCD-Hole), in |
Cover (Top) Mounting Pattern (Standard BCD-Hole), in |
Cover (Top) Mounting Pattern (Max. BCD-Hole), in |
Total Weight, lbm |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| DT3SD | 2,400 [271] | 1,100 [124] | 3,000 [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 | 5,600 [633] | 2,600 [294] | 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 |
28 |
| DT12SD | 9,600 [1,085] | 4,550 [503] | 12,000 [1,356] | 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 [1,898] | 7,775 [879] | 21,000 [2,373] | 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 [3,254] | 13,330 [1,506] | 36,000 [4,067] | 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 [3,616] | 14,815 [1,674] | 40,000 [4,519] | 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 [4,520] | 18,520 [2,093] | 50,000 [5,649] | 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 [5,695] | 23,330 [2,636] | 63,000 [7,118] | 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 [8,136] | 33,325 [3,766] | 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 [5,859] | 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
- * Bolt circle diameter
- Handwheel 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.
Helpful links
About SLB