Dynatorque SRD

Nondeclutchable manual override

Overview

The Dynatorque SRD™ nondeclutchable manual override is 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
Alternative to the Dynatorque SD™ declutchable manual override for spring-return applications
Eleven frame and spur combinations that provide output torque ranging from 3,000 to 260,000 lbf.in [340 to 29,375 N.m]

Tech Specs

Model	Spring-Return Actuator Spring-End Torque, lbf.in [N.m]	Override Max. 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 (Std. BCD-Tap), in	Housing (Bottom) Mounting Pattern (Max. BCD-Tap), in	Cover (Top) Mounting Pattern (Min. BCD-Hole), in	Cover (Top) Mounting Pattern (Std. BCD-Hole), in	Cover (Top) Mounting Pattern (Max. BCD-Hole), in	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

Table footnotes
Handwheel rim efforts shown are calculated at unit maximum torque rating.
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.
* Bolt circle diameter