Instruction Manual
D102602X012
657NS Actuator
November 2012
3
Specifications
Tables 1, 2, and 3 provide specifications for the various sizes of 657NS actuators discussed in this instruction manual.
Specific actuator information is found on the actuator yoke nameplate.
WARNING
To avoid personal injury or property damage, do not exceed pressure and temperature limits specified in table 1.
Educational Services
For information on available courses for the Fisher 657NS diaphragm actuator, as well as a variety of other products,
contact:
Emerson Process Management
Educational Services, Registration
P.O. Box 190; 301 S. 1
st
Ave.
Marshalltown, IA 50158-2823
Phone: 800-338-8158 or
Phone: 641-754-3771
FAX: 641-754-3431
e-mail: education@emerson.com
Installation
The diaphragm actuator is normally shipped mounted on a valve body. Follow the valve body instructions when
installing the control valve in the pipeline.
WARNING
Always wear protective gloves, clothing, and eyewear when performing any installation operations to avoid personal
injury.
Check with your process or safety engineer for any additional measures that must be taken to protect against process
media.
If installing into an existing application, also refer to the WARNING at the beginning of the Maintenance section in this
instruction manual.
WARNING
If the control valve and actuator are installed with the actuator in any position other than vertical, the actuator may not
conform with safety-related qualifications. Nonvertical orientation should be part of existing qualification analysis on file
at the plant site to ensure conformance with safety-related qualifications.
