The685SEand685SRaremediumtolarge
spring-return, double-acting piston actuators that
provide accurate, high thrust output for short to long
travel applications. These actuators are designed for
use with a variety of medium to large Fisher
slidingstem control valves including the easye™, FB,
TBX,CVX, HP, EH, and 461.
These actuators feature an internal bias spring that
forces the actuator piston rod to extend (685SE) or
retract (685SR) upon a loss of supply pressure, thereby
ensuring a fail-closed or fail-open mode of operation.
This effectively eliminates the need for a trip valve and
volume tank in most constructions.
Several configurations are available 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 254 to 711 mm (10 to 28
inches).
The 685SE and 685SR 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.
Features
High Thrust Capability — Maximum thrusts of up to
354 kN (79,000 lbf) can be produced, when supply
pressure is available.
Broad Application Coverage — Standard
constructions offer travels of up to 610 mm (24
inches) and cylinder diameters of up to 711 mm
(28 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.
X0993
Double Acting Construction — Pressure on both
sides of the piston results in stiff, precise
positioning.
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).
Mechanical Fail Mode — Depending on construction,
an internal bias spring will force the piston rod to
retract or extend upon a loss of supply pressure.
Manual Override — An optional side-mounted
handwheel or hydraulic hand-pump 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
61.2:685SE/685SR
September 2014
Table 1. Specifications
685SE and 685SR Actuators
D103791X012
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 40 psig
(2)
Travel
25 m m (1 inch) through 610 mm (24 inch)
See table 2
Thrust Capabilities
Designed to meet the application requirements
Piston Diameter and Area
(2)
Available in 51 mm (2 inch) increments between 254
mm (10 inch) and 711 mm (28 inch)
See table 2
For additional sizes, c ontact your Emerson Process
Management sales office.
Operative Temperature Limits
Standard: 40 to 93_C(40 to 200_F)
Low Temperature: 54 to 93_C(65 to 200_F)
Size 10 to 26: Handwheel
Size 28: Hydraulic Hand-pump
(4)
Weights
See tables 9 and 10
Lifting Point Load Ratings
See table 11
coated bore
Yoke Boss and Valve Stem Diameter
J 90.5 mm (3-9/16 inch) yoke boss with 19.1 mm
(3/4 inch) stem
25.4 mm (1 inch) stem
with 31.8 mm (1-1/4 inch) stem
yoke boss with 32 mm (1-1/4 inch) stem
J 127 mm (5 inch) yoke boss with
J 127 mm (5 inch) yoke boss
J 127 mm (5H inch)
J 178 mm
(7 inch) yoke boss with 51 mm (2 inch) stem
Pressure Connections
See table 3
Instrument Mounting
Mounting kits are available for use with the FIELDVUE
DVC6200 series digital valve controller
1. The pressure/temperature limits in this bulletin and any other applicable standard or code should not be exceeded.
2. Consult your Emerson Process Management sales office for larger travels or cylinder diameters. The Fisher 657, 667, and 585C family of actuators can be used for smaller travels or cylinder diamet
ers.
3. Consult your Emerson Pro cess Management sales office for applications requiring low or high temperature requirements.
4. Consult your Emerson Process Management sales office for applications requiring a manual override on a size 28 actuator.
J Pressure Equipment Directive (PED) 97/23/EC,
J ATEX Group II Category 2 Gas and Dust
,
J Systematic Safety Integrity, SIL 3, J GOST-R
(Russia),
J GOST-K (Kazakhstan)
2
685SE and 685SR Actuators
D103791X012
Figure 1. Fisher 685SE Piston Actuator
Product Bulletin
61.2:685SE/685SR
September 2014
SPRING CARTRIDGE
PRESSURE CONNECTIONS
(TOP AND BOTTOM)
TIE RODS
CYLINDER
PISTON
MOUNTING BOSSES
X0992
Principle of Operation
685SE and 685SR piston actuators utilize a 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. A bias spring that is either
below or above the piston, depending on construction,
will retract or extend the piston rod upon a loss of
supply pressure. This fail action will result in forcing an
attached control valve to either fail-open or fail-closed.
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
SPRING
PISTON WEAR RING
PISTON QUAD SEAL
BEARING ASSEMBLY
BEARING RETAINING RING
PISTON ROD
VALVE STEM CONNECTOR
YOKE
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 or hydraulic hand-pump
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 handwheel
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 handwheel override
function to reposition the control valve even if the
actuator cylinder or piston is removed for
maintenance. The hydraulic hand-pump override
utilizes a hydraulic cylinder that is connected to the
piston rod, which is controlled by a manual
hand-pump.
3
Product Bulletin
61.2:685SE/685SR
September 2014
685SE and 685SR Actuators
D103791X012
Instrument Selection
An excellent selection of sensitive and accurate
instruments is available for 685SE and 685SR
spring-return piston actuators. These include the
FIELDVUE DVC6200 digital valve controller, as well as
volume boosters.
DVC6200 Digital Valve Controller
FIELDVUE DVC6200 digital valve controllers are
communicating, microprocessorbased
Table 2. Standard Constructions
ACTUATOR
SIZE
1025410162.4150779
1230512162.41730113
1435614324.91993154
1640616324.911297201
1845718324.911642254
2050820467.072027314
2255922467.072452380
2461024629.622919452
2666026629.623425531
2871128629.623973616
1. Consult your Emerson Process Management sales office for additional sizes.
PISTON
DIAMETER
mmInchmmInchcm2Inch
(1)
PISTON RODPISTON AREA
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.
VALVE STEM
CONNECTOR SIZE
2
mmInchmmInchmmInchmmInch
193/4903-9/162512038
25112752512038
32 or 51 1-1/4 or 2 127 or 178 5H or 725161024
193/4903-9/162511546
25112752512038
32 or 51 1-1/4 or 2 127 or 178 5H or 725161024
25112752512038
32 or 51 1-1/4 or 2 127 or 178 5H or 725161024
25112752512038
32 or 51 1-1/4 or 2 127 or 178 5H or 725161024
25112752512038
32 or 51 1-1/4 or 2 127 or 178 5H or 725161024
25112752512038
32 or 51 1-1/4 or 2 127 or 178 5H or 725161024
25112752512038
32 or 51 1-1/4 or 2 127 or 178 5H or 725161024
25112752512038
32 or 51 1-1/4 or 2 127 or 178 5H or 725161024
25112752512038
32 or 51 1-1/4 or 2 127 or 178 5H or 725161024
25112752512038
32 or 51 1-1/4 or 2 127 or 178 5H or 725161024
YOKE BOSS
DIAMETER
VALVE TRAVEL
MinimumMaximum
4
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