Instruction Manual
D103626X012
685 Piston Actuator
June 2017
2
Table 1. Specifications
Operating Pressure
(1)
Minimum: 2.7 bar (40psig)
Maximum Allowable: 10.3 bar (150 psig)
Consult your Emerson sales office
or Local Business
Partner 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
See table 3
Piston Diameter and Area
(2)
Available in 51 mm (2 inch) increments between 305
mm (12 inch) and 660 mm (26 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: 29 to 204_C (20 to 400_F)
(3)
Yoke Boss and Valve Stem Diameter
J 127 mm (5H inch) yoke boss with 32 mm (1-1/4
inch) stem J 178 mm (7 inch) yoke boss with 51 mm
(2 inch) stem
Pressure Connections
Standard: 3/4 NPT
Optional: 1 and 11/4 NPT
Instrument Mounting
Mounting kits are available for use with the FIELDVUE
DVC6200 Series positioner
Construction Materials
PART MATERIAL
Yoke ASTM A36 (steel)
Piston ASTM A36 (steel)
Cylinder 305 to 559 mm (12 to 22 inch) Cylinder:
1026 DOM (steel) with chrome-plated
bore
610 to 660 mm (24 to 26 inch) Cylinder:
ASTM A516 Grade 70 (steel) with
fluoropolymer coated bore
Upper/Lower Heads ASTM A36 (steel)
Tie Bolt ASTM A311 1045, Class B (steel)
Piston Rod S31603 (316L stainless steel)
Stem Connector ASTM A36 (steel)
Weights
See tables 4 and 5
Lifting Point Load Ratings
See table 6
Optional Certifications
(4)
J Pressure Equipment Directive (PED) 2014/68/EU
J Complies with the requirements of ATEX Group II
Category 2 Gas and Dust
J Customs Union Technical Regulations (CU TR)
010/2011 and 012/2011
II Gb c T* X/III Db c T* X
Fisher 685 actuators have been evaluated for ignition
hazard and certified for CUTR 012/2011 under
“protection by constructional safety”. To ensure
conformity with CUTR, only Fisher parts and materials
can be used.
1. The pressure/temperature limits in this bulletin and any other applicable standard or code should not be exceeded.
2. Consult factory for larger travels or cylinder diameters. The Fisher 585C family of actuators are available for smaller travels or cylinder diameters.
3. Consult factory for applications requiring low or high temperature requirements.
4. Refer to the product nameplates to determine which certifications each actuator construction possesses.
Specifications
Specifications for 685 piston actuators are given in table 1. Refer to the nameplate affixed to the actuator yoke for
specifications specific to individual constructions.
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