Instruction Manual
D103799X012
685SE/685SR Piston Actuator
September 2014
2
Table 1. Specifications
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 psi)
Travel
(2)
25 mm (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
Operative Temperature Limits
Standard: -40 to 93_C (-40 to 200_F)
Low Temperature: -54 to 93_C (-65 to 200_F)
(3)
High Temperature: -32 to 204_C (-25 to 400_F)
(3)
Pressure Connections
See table 3
Yoke Boss and Valve Stem Diameter
J 90.5 mm (39/16 inch) yoke boss with 19.1 mm (3/4
inch) stem
J 127 mm (5 inch) yoke boss with 25.4 mm
(1 inch) stem
J 127mm(5inch)yokebosswith31.8
mm (11/4 inch) stem
J 127 mm (5H inch) yoke boss
with 32 mm (11/4 inch) stem
J 178mm(7inch)yoke
boss with 51 mm (2 inch) stem
Instrument Mounting
Mounting kits are available for use with the FIELDVUE™
DVC6200 series digital valve controller
Construction Materials
PART MATERIAL
Yoke ASTM A36 (steel)
Piston ASTM A36 (steel)
Cylinder
254 to 559 mm (10 to 22 inch) cylinder:
1026 DOM (steel) with chromeplated bore
610 to 711 mm (24 to 28 inch) cylinder:
ASTM A516 Grade 70 (steel) with
fluoropolymer coated bore
Upper/Lower Heads ASTM A36 (steel)
Outer Spring Cartridge ASTM A36 (steel)
Tie Bolt ASTM A311 1045, Class B (steel)
Piston Rod S31603 (316L Stainless Steel)
Stem Connector ASTM A36 (steel)
Manual Override (optional)
Size 10 to 26: Handwheel
Size 28: Hydraulic Hand-pump
(4)
Weights
See tables 4 and 5
Lifting Point Load Ratings
See table 6
1. The pressure/temperature limits in this instruction manual and any other applicable standard or code should not be exceeded.
2. Contact 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
diameters.
3. Contact your Emerson Process Management sales office for applications requiring low or high temperature requirements.
4. Contact your Emerson Process Management sales office for applications requiring a manual override on a size 28 actuator.
Specifications
Specifications for the 685SE and 685SR piston actuators areshownintable1.Refertothenameplateaffixedtothe
actuator yoke for specifications specific to individual constructions.
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