RACK & PINION ACTUATORS
2R40 to 2R1750 Series
Installation & Maintenance Manual
2
October 24, 2013
www.atcontrols.com
Engineering\documents\products\IOM\IOM1003.docx
4. Travel
Adjustment:
The Triac 2nd generation rack & pinion actuators have travel
stop adjustments in both the clockwise and counterclockwise
directions. The 5 degrees overtravel feature provides
adjustments from -5 degrees to +5 degrees at the 0 degree
clockwise position and from 85 degrees to 95 degrees at the
90 degree counterclockwise position.
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
adjustment for both ends of the stroke to achieve the expected
performance. See the valve manufacture’s IOM on how the travel should be adjusted.
Ball & Plug Valves
require precise adjustment at the open and closed position. This is to protect the
seat from the flow media and to assure absolute shut-off in the closed position.
Butterfly Valves
require precise adjustment at the open and closed position. This is to assure full shut-
off, to prevent disc overtravel which can damage the seat in the closed position, and to assure
maximum flow in the open position.
Tee Assemblies,
where two valves are operated in tandem through a single operator, (3-way
configuration) require precise adjustment at both ends of the stroke. This is to assure the seating of
both valves.
5. Spare
Parts:
Actuator
Size
Buna
Repair Kit
-20°F to
175°F
Viton
Repair Kit
0°F to
300°F
Low Temp
Repair Kit
-45°F to
175°F
Spring
Cartridges
(each)
2R40
2RKB0040 2RKV0040 2RKLT0040 SP20040
2R80
2RKB0080 2RKV0080 2RKLT0080 SP20080
2R130
2RKB0130 2RKV0130 2RKLT0130 SP20130
2R200
2RKB0200 2RKV0200 2RKLT0200 SP20200
2R300
2RKB0300 2RKV0300 2RKLT0300 SP20300
2R500
2RKB0500 2RKV0500 2RKLT0500 SP20500
2R850
2RKB0850 2RKV0850 2RKLT0850 SP20850
2R1200
2RKB1200 2RKV1200 2RKLT1200 SP21200
2R1750
2RKB1750 2RKV1750 2RKLT1750 SP21750
*Seal Kits also available, but Complete Repair Kits are recommended
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