ACAIM028-00 (AC-98) 3/01
©
2001, Flowserve Corporation, Provo, Utah
3-Position Control/Dribble Control
SR Limit Switch Method
Accord Controls 765 South 100 East Phone: 801 373 4576
A Unit of Flowserve Corporation Provo, Utah 84606 Facsimile: 801 489 2591
www.accord-controls.com
AR5 Actuator
Installation, Operation and Maintenance Instructions
CONTROLS
Page 1 of 4
AR5 Scotch-Yoke Actuator
The AR5 scotch-yoke actuator is an extension to the AR-
series pneumatic scotch-yoke actuator. The AR5 actuator will
produce up to 500,000 in.-lb. double acting torque and
225,000 in.-lb. spring end torque.
Installation to Valve
1. All actuators are factory lubricated for life, but still
should be protected from the elements and stored
indoors until ready for use. The ports of the actuator
are plugged as supplied from the factory. If actuators
are stored for a long period of time prior to installation,
the actuators should be stroked every 3 months to
prevent the seals from taking set. See bulletin B00129
for long term storage instructions.
2. Prior to assembly, manually open and close valve to
ensure freeness of operation. Be sure valve and
actuator rotate in the same direction and are in the
same position (i.e. valve closed, actuator closed).
3. Check the mounting surfaces, the stem adaptor, and
the bracket to assure proper fit. Secure the valve in the
closed position with the stem vertical. Bolt the bracket
to the valve and place the stem adaptor on the valve
stem. Position the actuator over the valve and lower to
engage the stem adaptor to the actuator output bore.
Continue to lower until the actuator seats on the
bracket mounting surface. In order to align the bolt
holes, it may be necessary to turn or stroke the
actuator a few degrees and/or adjust the actuator
travel stops. Bolt the actutor to the bracket.
4. Adjust the travel stop bolts of the actuator for the
proper open and closed valve positions, per valve
manufacturer’s recommendations. Pneumatically
stroke the actuator several times to assure proper
operation. The stem adaptor should not bind during
operation. If the actuator is equipped with an
UltraSwitch or other accessories, adjust them at
this time.
5. To prolong actuator life use only clean, dry plant air.
Lubricated air is not required, however it is recommended
particularly for high cycleapplications.
Caution: Do not use Lubricated air with Positioners.
AR5 Actuator
Field Conversion from Fail CW to Fail CCW
(for Spring Return Actuators)
The AR5 spring return actuator can be converted from fail CW
to fail CCW easily. Simply turn actuator over and mount to
valve. This is easily accomplished due to identical valve and
accessory mounting pattern machined in the body and cover.
Follow steps below:
1. Disconnect all air and electrical supplies from actuator.
2. Remove any accessories from top actuator mounting
surface.
3. If actuator is mounted to valve dismount actuator
from valve.
4. Remove valve mounting bracket from bottom actuator
mounting surface.
5. Turn actuator over so that the body cover is now
facing down.
6. Install actuator to valve as described above, using
valve mounting pattern on body cover. (Be sure
actuator and valve are in same position)
7. Reinstall any accessories that were removed from
actuator.
8. Check actuator for proper operation.
Travel Stop Adjustments
All actuated valves require accurate travel-stop adjustments at
both ends of the stroke to obtain optimum performance and
valve seat life. The accumulation of tolerances in the adaption
of actuators to valves is such that there must be a range of
adjustments for both ends of the stroke to achieve optimum
performance.
The AR5 actuator has travel stop adjustments in both the
clock-wise and counter-clockwise directions. The 12 degree
over-travel feature provides adjustments from -6 to +96
degrees.
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