The 685 is a double-acting piston actuator that
provides accurate, high thrust output for short to long
travel applications. This actuator is designed for use
with a variety of medium to large Fisher sliding-stem
control valves including the easye™, FB, TBX, HP, EH,
and 461.
The 685 family is available in several configurations to
cover a wide range of application requirements.
Typical travels range from 25 to 610 mm (1 to 24
inches) and cylinder diameters range from 305 to 660
mm(12to26inches).Thrustcapabilitiesextendto
354 kN (79,000 lbf) and above with special
constructions.
The 685 can be used with the FIELDVUE™ DVC6200
digital valve controller for throttling applications, or
with switching valves for onoff control. This actuator
can also be fitted with volume boosters for fast
stroking requirements.
Product Bulletin
61.2:685
September 2014
Features
High Thrust Capability — Maximum thrusts of up to
354 kN (79,000 lbf) can be produced.
Broad Application Coverage — Standard
constructions offer travels of up to 610 mm (24
inches) and cylinder diameters of up to 660 mm (26
inches). Even larger constructions are available
upon request.
Low Friction — Low friction piston seals and either
chrome plated or fluoropolymer coated cylinder
bores reduce sliding friction and wear.
X0922
Wide Temperature Range — Standard constructions
offer a temperature range of -40 to 93_C(-40to
200_F), however higher or lower temperatures are
possible. Special constructions can operate as low
as -54_C(65_F)andashighas204_C(400_F).
Manual Override — An optional side-mounted
handwheel is capable of extending or retracting the
actuator manually and can be engaged at any
position from full open to full closed.
www.Fisher.com
Product Bulletin
61.2:685
September 2014
Table 1. Specifications
685 Piston Actuator
D103625X012
Operating Pressure
(1)
Minimum: 2.7 bar (40psig)
Maximum Allowable: 10.3 bar (150 psig)
Consult your Emerson Process Management sales
office for supply pressures under 2.7 bar (40 psig)
(2)
Travel
Construction Materials
PARTMATERIAL
YokeASTM A36 (steel)
PistonASTM A36 (steel)
Cylinder305to559mm(12to22inch)
25 mm (1 inch) through 610 mm (24 inch)
See table 4
Thrust Capabilities
See table 5
Piston Diameter and Area
(2)
Upper/Lower HeadsASTM A36 (steel)
Tie BoltASTM A311 1045, Class B (steel)
Piston RodS31603 (316L stainless steel)
Stem ConnectorASTM A36 (steel)
Available in 51 mm (2 inch) increments between 305
mm (12 inch) and 660 mm (26 inch)
See table 4
For additional sizes, contact your Emerson Process
Weights
See tables 11 and 12
Management sales office.
Lifting Point Load Ratings
Operative Temperature Limits
See table 2
Standard: 40 to 93_C(40 to 200_F)
Low Temperature: 54 to 93_C(65 to 200_F)
High Temperature: 29 to 204_C(20 to 400_F)
Yoke Boss and Valve Stem Diameter
J 127mm(5Hinch)yokebosswith32mm(1-1/4
inch) stem
J 178 mm (7 inch) yoke boss with 51 mm
(2 inch) stem
(3)
(3)
Options
J Mechanical Handwheel, J Pneumatic fail mode
via Fisher 377 trip valve,
Fisher Optimized Digital Valve (ODV) Package
Dimensions
Seefigure3andtables7,8,9,and10
Pressure Connections
Standard: 3/4 NPT
Optional: 1and11/4 NPT
Seefigure2andtable6
Instrument Mounting
Mounting kits are available for use with the FIELDVUE
DVC6200 series positioner
1. The pressure/temperature limits in this bulletin and any other applicablestandard or code shouldnot be exceeded.
2. Consult factory for larger travels or cylinderdiameters. The Fisher 585Cfamily of actuators canbe used for smaller travelsor cylinder diameters.
3. Consult factoryfor applications requiringlow or high temperature requirements.
Certifications
J Pressure Equipment Directive (PED) 97/23/EC,
J ATEX Group II Category 2 Gas and Dust
685 piston actuators utilize a pneumatically controlled
piston that moves inside of a cylinder to generate
thrust. A seal contained on the circumference of the
piston provides a seal between the piston and the
cylinder, preventing supply pressure leakage.
From an equilibrium state, the actuator operates by
reacting to a force unbalance that is created by
increasing supply pressure on one side of the piston,
anddecreasingitontheother.Thismovesthepiston
up or down, and results in a repositioning of the
attached control valve. Travel can be adjusted using
travel limits within a valve positioner, which limit the
travel range of the actuator. The optional handwheel
manual override does not have the ability to act as a
hard travel stop.
An optional handwheel manual override is capable of
extending or retracting the actuator manually and can
be engaged at any position from full open to full close.
This override utilizes a worm gear assembly that is
attached to the stem connector and not attached to
the cylinder or piston rod. This enables the manual
override to reposition the control valve even if the
actuator cylinder or piston is removed for
maintenance.
Instrument Selection
An excellent selection of sensitive and accurate
instruments is available for 685 piston actuators.
TheseincludetheFIELDVUE DVC6200 digital valve
controller, as well trip valves and volume boosters.
DVC6200 Digital Valve Controller
FIELDVUE DVC6200 digital valve controllers are
communicating, microprocessorbased
currenttopneumatic instruments. In addition to the
traditional function of converting a current signal to a
pressure signal, DVC6200 digital valve controllers,
using HARTr or FOUNDATION™ fieldbus
communications protocol, give easy access to
information critical to process operation.
For additional information, refer to Fisher bulletin
62.1:DVC6200 (D103415X012) or 62.1:DVC6200f
(D103399X012), available at www.FIELDVUE.com or
from your Emerson Process Management sales office.
3
Product Bulletin
61.2:685
September 2014
Figure 1. Fisher 685 Piston Actuator
TIE RODS
685 Piston Actuator
D103625X012
PRESSURE CONNECTIONS
(TOP AND BOTTOM)
PISTON WEAR RING
PISTON QUAD SEAL
PISTON
MOUNTING BOSSES
X0923
CYLINDER
PISTON ROD
BEARING ASSEMBLY
BEARING RETAINING RING
VALVE STEM CONNECTOR
YOKE
Table 2. Lifting Point Load Ratings
ACTUATOR SIZE
12 to24
26228606300
12 to24
262635014000
LIFTING
ORIENTATION
Actuator Centerline
Horizontal
Actuator Centerline
Vertical
NUMBER OF LIFTING POINTS USED
215403400
237608300
MAXIMUM LOAD
kglbs
Table 3. Handwheel Specification
ACTUATOR
SIZE
124448210000305123.89629065
14 to 188896420000406163.08038085
20 to 2613344730000610242.872450100
4
OUTPUT THRUSTHANDWHEEL DIAMETER
NlbsmmInchNlbs
TURNS PER
mm OF
TRAVEL
TURNS PER
INCH OF
TRAVEL
MAXIMUM RIM FORCE
REQUIRED
685 Piston Actuator
D103625X012
Product Bulletin
61.2:685
September 2014
Table 4. Standard Constructions
ACTUATOR
SIZE
123051673032 or 51127 or 178>203610
143563299332 or 51127 or 178>203610
1640632129732 or 51127 or 178>203610
1845732164232 or 51127 or 178>203610
2050846202732 or 51127 or 17825610
2255946245232 or 51127 or 17825610
2461062291932 or 51127 or 17825610
2666062342532 or 51127 or 17825610
12122.4111311/4or25Hor 7>824
14144.9115411/4or25Hor 7>824
16164.9120111/4or25Hor 7>824
18184.9125411/4or25Hor 7>824
20207.0731411/4or25Hor 7124
22227.0738011/4or25Hor 7124
24249.6245211/4or25Hor 7124
26269.6253111/4or25Hor 7124
1. Consult your Emerson Process Management salesoffice for additional sizes.
Neither Emerson, Emerson Process Management, nor any of their affiliated entities assumes responsibility for the selection, use or maintenance
of any product. Responsibility forproper selection, use,and maintenance of any product remains solelywith the purchaser and enduser.
Fisher, easy-e,and FIELDVUE are marks owned by oneof the companies in the Emerson Process Management business unit of Emerson Electric Co.Emerson
Process Management, Emerson, and the Emerson logo are trademarks and service marks of Emerson Electric Co. HART is a mark owned by the HART
Communication Foundation. 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, they arenot
to be construed as warranties or guarantees, express or implied, regarding the products or services described herein or their use or applicability. All sales are
governed by our terms and conditions, which are available upon request. Wereserve the right to modify or improve the designs or specifications of such
products at any time without notice.
Emerson Process Management
Marshalltown, Iowa 50158 USA
Sorocaba, 18087 Brazil
Chatham, Kent ME4 4QZ UK
Dubai, United Arab Emirates
Singapore 128461 Singapore
www.Fisher.com
E 2013, 2014 Fisher Controls International LLC. All rights reserved.
12
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