2076 NORTHWOODS DR
MUSKEGON, MI 49442
PHONE (231) 788-7025
FAX (231) 788-7030
www.dynatorque.com
ISO 9001:2008 CERTIFIED
Page 4 of 7
IOMSRD
IOM FOR DYNATORQUE™ SPRING RETURN MANUAL OVERRIDE (SRD TYPE)
Revised: 4-15-11
Additional SRD Installation Tips:
1. With the drive coupling removed from the override, place the override on the valve assembly and
loosely bolt into place.
2. Before reinstalling the drive coupling, liberally grease the outside of the driver and the override bore.
This may prevent galling and reduce the possibility of corrosion between the two components.
3. Reinstall the driver making sure the end of the driver configured to fit the valve stem, is correctly
aligned.
4. Tighten the valve to SRD with mounting bolts.
5. The opposite end of the drive coupling should be configured to match the pneumatic actuator output.
Align the pneumatic actuator drive with the override drive coupling and lower the pneumatic actuator
into place on the top flange of the override.
6. Bolt the pneumatic actuator in place.
7. Adjust override travel stops as indicated above.
Step 7.
Return the valve to the full closed position using the
pneumatic actuator, to confirm the proper setting of all
components. Stroke the valve and actuator assembly several
times from closed to open to close to confirm proper pneumatic
operation. (Note: When the assembly is in the closed position,
the SRD input shaft should be able to be freely rotated ½ to ¾
of a turn in the CCW direction if properly adjusted. (Note: It is
critical to the function of the assembly that the SRD be
returned to the home position after every manual cycle) Failure
to do so may render the assembly inoperable and damaged.
Step 8.
Manually turn the input shaft of the SRD CCW to fully
open the valve. (Note: Air lines, which may prevent back driving
the actuators pneumatic piston, must be purged or otherwise
vented to atmosphere.) As the spring in the actuator becomes
compressed, the operating input torque of the SRD will increase
along with human manual effort (Ref Photo 7).
Step 9.
Verify the full open position of the valve by visually locating the
position of the disc, ball, or plug. Set the SRD open stop bolt by turning it
CCW until it comes into contact with the worm wheel. Upon contact, reverse
half turn to insure the SRD stop bolt is not used
as the primary travel stop.
(Ref. Photo 8)
Step 10.
Return the SRD to the “Home Position” by rotating the input shaft
CW. Complete at least one more cycle test to ensure correct operation of
the pneumatic actuator.
