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Fisher
™
685 Piston Actuator
Contents
Introduction 1.................................
Scope of Manual 1.............................
Description 1.................................
Specifications 2...............................
Educational Services 3.........................
Principle of Operation 3.........................
Installation 5..................................
Three-Way Valve Applications Note 6.............
Actuator Mounting 6..........................
Handwheel Operation 7.........................
Maintenance 8.................................
Actuator Removal 9...........................
Seal and O-ring Replacement 9..................
Parts Ordering 11...............................
Parts Kit 11....................................
Parts List 12...................................
Figure 1. Fisher 685 Piston Actuator
X0922
Introduction
Scope of Manual
This instruction manual provides information on the installation, maintenance, and parts ordering for Fisher 685
piston actuators. Refer to separate instruction manuals for information regarding other equipment and accessories
used with these actuators.
Do not install, operate, or maintain a Fisher 685 actuator without being fully trained and qualified in valve, actuator,
and accessory installation, operation, and maintenance. To avoid personal injury or property damage, it is important
to carefully read, understand, and follow all the contents of this manual, including all safety cautions and warnings. If
you have any questions about these instructions, contact your Emerson sales office
or Local Business Partner before
proceeding.
Description
The Fisher 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.
Instruction Manual
D103626X012
685 Piston Actuator
June 2017
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