2076 NORTHWOODS DR
MUSKEGON, MI 49442
PHONE (231) 788-7025
FAX (231) 788-7030
www.dynatorque.com
ISO 9001:2008 CERTIFIED
Page 5 of 7
IOMSRD
IOM FOR DYNATORQUE™ SPRING RETURN MANUAL OVERRIDE (SRD TYPE)
Revised: 4-15-11
Safety:
The use of handwheels larger than recommended by the factory, cheater bars, etc. will void the override
warranty and may cause damage to the operator, valve stem, drive shafts, or other torque transmitting
devises as well as being dangerous to the user. Additionally, the use of chainwheels on operators that are
not recommended for those applications will result in voiding operator warranty.
Important Safety Warnings for SRD Overrides:
1. The SRD must remain in the “Home Position” at all times for the pneumatic operator to function
properly. Leaving the SRD in any other position will result in system failure and may cause damage to
the SRD or pneumatic system components.
2. Adjustment of the SRD stops from initial assembly position may prevent valve from achieving full open
or full closed positions and may cause damage to SRD or pneumatic system or components.
3. Remember, drive coupling exterior key should be bolted in place to prevent key roll.
Operation:
NOTE: In this example we are using the convention of “on loss of power, valve will spring-to-fail closed
moving in the clockwise direction as viewed from above”.
In the event the pneumatic actuator’s power supply fails, a spring return pneumatic actuator will move to
its fail position. Prior to manual operation, assure the pneumatic actuator’s cylinders have been vented to
atmosphere. To manually override the actuator, rotate the handwheel counterclockwise for a fail closed
actuator, and clockwise for a fail open actuator. The gearing is self locking, so once the override position
has been reached (full CCW for a fail closed, and full CW for a fail open) the valve, actuator, and override
can stay in this position until the air supply is restored.
Note:
When pneumatic actuator air has been
restored, the manual override must be returned to its home position. For a fail CW actuator, the
handwheel needs to be rotated full CW, and for a fail CCW actuator, the handwheel needs to be rotated
full CCW. For a video demonstration of the operation of the SRD override see visit our website or use
link:
http://www.c-a-m.com/Forms/Product.aspx?prodID=c606a051-471c-4e48-9800-6ac41cc9ae86
.
It is
extremely important to remember this last step, as failure to do so could cause damage to the
SRD, its gearing, or the pneumatic system components, and void warranty.
Trouble Shooting:
Override doesn’t work at all:
1. Never use excessive force. If the operator will not operate correctly, follow these steps.
2. Make certain that all compressed air has been exhausted from the pneumatic actuator. The actuator
must be vented on both sides of all pistons.
3. Make sure that all components were installed in the same beginning position. The wrong position of
any one of the torque transmitting devices, couplings, drivers, can prevent the operator from stroking.
4. Be certain that nothing is physically preventing the valve from closing/opening. That is, make sure that
nothing is lodged in the valve trim (ball, plug, disc. etc.).
5. Check that no physical damage has occurred which might limit or prevent movement of the actuator.
Examples could be: a dented actuator cylinder, damaged drive coupling or hardware.
