Management of Change (MOC) is a procedure used to proactively manage changes
that have the potential to impact safety or the process within a plant. Evaluating
new techniques for improving MOC approval procedures can have an impact on
plant efciency. Historically, upgrading obsolete products or replacing existing
process control equipment had been delayed or abandoned due to the extensive
paperwork involved in completing a complex MOC approval sheet.
Background
The Fisher 685 is a double acting piston actuator that provides accurate, high thrust
output for short to long travel sliding stem valve applications. The purpose of this
document is to simplify the transition from existing piston actuator technologies,
which are beyond their service life or no longer provide the control and reliability
required, to the Fisher 685 actuator.
Contained in this guide are two sections, the rst contains questions and answers
and the second compares the Fisher 685 actuator to the ATI L DA and Fisher 585CLS
actuators. The rst section helps users complete management of change (MOC)
approval documents when replacing existing actuators with the 685 model. The
second section helps users better understand the differences and similarities
between the 685, ATI L DA, and 585CLS actuators.
MOC: 685 Actuators
September 2018 / D352215X012
Question & Answer Checklist
Q: Does the proposed modication change process chemistry,
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technology, or operating and control philosophies?
A: No.
Q: Does the proposed modication change how the existing plant is
operated?
A: No.
Q: Does the proposed modication change process ows?
A: No.
Q: Does the proposed modication cause any changes to P&IDs?
A: No.
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Q: Does the proposed modication change existing pressure relief cases?
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A: No.
Q: Does the proposed modication change the process description?
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A: No.
Q: Have the codes and standards to which the new equipment was
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designed changed?
A: No.
Q: Have the operating and design conditions (ow, temperature,
pressure) of the proposed modication changed?
A: No.
MOC: 685 Actuators
September 2018 / D352215X012
Q: Does the proposed modication change the materials of construction
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such as a change in material form (cast, forged) or alloy?
A: No.
Q: Does the proposed modication change introduce new equipment
items that require periodic predictive maintenance?
A: No, the new equipment items will require the same periodic
maintenance as required by the old equipment items.
Q: Does the proposed modication change existing operator training
requirements?
A: No.
Q: Does the proposed modication introduce new equipment items that
require training, manuals, maintenance procedures, or training to
teach maintenance department craftsmen how to maintain them?
A: Yes, however the new equipment items have the same theory of
operation and maintenance procedures as the old equipment items.
See the Fisher 685 Actuator Instruction Manual (D103626X012)or
contact your local Emerson sales ofce.
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Q: Does the proposed modication introduce new equipment items that
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require spares or obsolete spares for existing equipment?
A: Yes, spares for old equipment items cannot be used with new
equipment items due to differences in dimensions between the old
and new equipment items. Documentation on recommended spares
can be obtained by providing the two serial numbers, located on the
actuator, to your local Emerson sales ofce.
Q: Does the proposed modication change the inspection scope or
inspection interval?
A: No.
Fisher 585CLS and 685 Actuator
Comparison
Even though the 685 and 585CLS actuators have identical theories of operation,
there are certain key differences and advantages in the design and feature set of
the 685 actuator. This section provides insight on the differences and similarities
between these two actuators.
MOC: 685 Actuators
September 2018 / D352215X012
Basic Design and Features
The 685 actuator has the same theory of operation, valve to actuator mounting
type, and valve stem connection diameters as the 585CLS actuator. The 685
actuator can also be mounted and installed onto the same valves that the 585CLS
actuator is available for and currently installed onto. Table 1, 2, and 3 provide sideby-side comparisons of design specications, instrument compatibility, materials of
construction, and certications between the 685 and 585CLS actuators.
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MOC: 685 Actuators
September 2018 / D352215X012
SpecicationFisher 685 Actuator
(1)
Fisher 585CLS Actuator
Actuator TypeDouble-acting piston for sliding stem valves
Cylinder Diameter305 to 660 mm (12 to 26 inches)254 to 356 mm (10 to 14 inches)
Travel25 to 610 mm (1 to 24 inches)225 to 606 mm (8.875 to 23.875 inches)
Operating Pressure2.7 to 10.3 bar (40 to 150 psig)2.8 to 13.8 bar (40 to 200 psig)
Operating Temperature Limits
(3)
Thrust
Standard: -40 to 93˚C (-40 to 200˚F)
Low Temp: -54 to 93˚C (-65 to 200˚F)
High Temp: -29 to 204˚C (-20 to 400˚F)
20 to 354 kN (4,524 to 79,639 lbs)14 to 103 kN (3,140 to 23,100 lbs)
Standard: -23 to 74˚C (-10 to 165˚F)
Low Temp: -46 to 66˚C (-50 to 150˚F)
High Temp: -23 to 121˚C (-10 to 250˚F)
Pressure Connections3/4, 1, or 1 1/4 Inch NPT1/4 Inch NPT
1. Representative of standard constructions.
2. Maximum operating pressure varies depending on cylinder diameter.
3. Thrust varies depending on supply pressure, cylinder diameter, and stroke direction (push or pull). Values listed are for the push stroke direction.
Table 1. Design Specication Comparison
Compatible (Yes/No)
Instrument
Fisher 685 Actuator
Fisher 585CLS
Actuator
ATI L DA Actuator
FIELDVUE™ DVC6000 Series PositionersYesYesYes
FIELDVUE DVC6200 Series PositionersYesYesNo
Fisher 2625 Volume BoosterYesYesYes
Fisher SS-263 Volume BoosterYesYesNo
Fisher 377 Trip ValveYesYesYes
TopWorx™ GO Switch™ Position SensorYesYesYes
Table 2. Instrument Compatibility Comparison
(1)
(2)
Certication
PED (97/23/EC)YesYesYes
ATEXYesYesNo
SILYesNoYes
Table 3. Certications Comparison
Compatible (Yes/No)
Fisher 685 ActuatorFisher 585CLS ActuatorATI L DA Actuator
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Weight
The Fisher 685 and 585CLS actuators are similar in weight. Please contact your local
Emerson sales ofce for a weight comparison between an installed 585CLS and 685
actuator.
Envelope Dimensions
Refer to Table 4,5, and 6 with Figure 1 for a comparison of envelope dimensions
between the 685 and 585CLS actuator.
Table 6. Height Envelope Dimensions for Actuators with 178 mm (7 inch) Yoke Boss Diameters
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WIDTH
MOC: 685 Actuators
September 2018 / D352215X012
WIDTH
HEIGHT
Figure 1. Front view of 685 Actuator
without manual override
HEIGHT
Figure 2. Front view of 685 Actuator
with manual override
ATI L DA and Fisher 685 Actuator
Comparison
Even though the Fisher 685 and ATI L DA actuators have identical theories of
operation, there are certain key differences in the design and feature set of the 685
actuator. This section provides insight on the differences and similarities between
these two actuators.
Basic Design and Features
The 685 actuator has the same theory of operation, yoke boss diameters, and
valve stem connection diameters as the ATI L DA. The 685 actuator can also be
mounted and installed onto the same valves that the ATI L DA is available for and
currently installed onto. Table 2, 3, and 6 provide side-by-side comparisons of
design specications, instrument compatibility, materials of construction, and
certications between the 685 and ATI L DA actuators.
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MOC: 685 Actuators
September 2018 / D352215X012
SpecicationsFisher 685 Actuator
(1)
ATI L DA Actuator
Actuator TypeDouble-acting piston for sliding-stem valves
Yoke Boss Diameter
(valve to actuator mounting type)
5H or 7 inch
Valve Stem Connection Diameter1 1/4 or 2 Inch
Manual Override CapabilitySide mounted handwheel
Cylinder Diameter305 to 660 mm (12 to 26 inches)102 to 1,118 mm (4 to 44 inches)
Travel25 to 610 mm (1 to 24 inches)25 to 1,270 mm (1 to 50 inches)
Operating Pressure2.7 to 10.3 bar (40 to 150 psig)
Standard: -40 to 93˚C (-40 to 200˚F)
Operating Temperature Limits
Low Temp: -54 to 93˚C (-65 to 200˚F)
High Temp: -29 to 204˚C (-20 to 400˚F)
(2)
Thrust
20 to 354 kN (4,524 to 79,639 lbs)2 to 964 kN (478 to 216,676 lbs)
Pressure Connection Size3/4, 1, or 1 1/4 Inch NPT
1. Representative of standard constructions. Special constructions are available to cover additional cylinder diameters, travels, and thrusts.
2. Thrust varies depending on supply pressure, cylinder diameter, and stroke direction (push or pull). Values listed are for the push stroke direction.
Table 7. Design Specications Comparison
Weight and Envelope Dimensions
The Fisher 685 actuator and ATI L DA actuator have identical envelope dimensions
and weights when comparing actuators with similar feature sets.
Conclusion
Introducing the Fisher 685 actuator in place of the ATI L DA actuator and Fisher
585CLS actuator will not affect 585CLS actuators currently installed in plants.
Spares for existing 585CLS actuators will continue to be available, but all spares for
the ATI L DA and 585CLS actuators will not be compatible with the 685 actuator.
The Fisher 685 actuator offers new sizes and features in addition to the previous
585CLS actuator offerings and will offer at least the same application coverage
range as the ATI L DA actuator.
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Additional Resources
Contact your local Emerson sales ofce or see the resources below for more
information about Fisher 685 actuators.
685 Actuator Bulletin
685 Actuator Instruction Manual
MOC: 685 Actuators
September 2018 / D352215X012
Visit Fisher.com to
nd an Emerson sales
contact in your area.
http://www.Facebook.com/FisherValves
http://www.Twitter.com/FisherValves
Emerson Automation Solutions
Marshalltown, Iowa 50158 USA
Sorocaba, 18087 Brazil
Cernay, 68700 France
Dubai, United Arab Emirates
Singapore 128461 Singapore
Fisher is a mark owned by one of the companies in the Emerson Automation Solutions business unit
of Emerson Electric Co. Emerson and the Emerson logo are trademarks and service marks of Emerson
Electric Co. All other marks are the property of their respective owners.
The contents of this publication are presented for informational purposes only, and while every
effort has been made to ensure their accuracy, nothing herein is to be construed as a warranty
or guarantee, express or implied, regarding the products or services described herein or their
use, performance, merchantability or tness for a particular purpose. Individual results may vary.
All sales are governed by our terms and conditions, which are available upon request. We reserve
the right to modify or improve the designs or specications of our products at any time without
notice. Responsibility for proper selection, use and maintenance of any product or service remains
solely with the purchaser and end user.
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