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Fisher
™
667NS Diaphragm Actuators
Size 40, 45, 70, and 80
Contents
Introduction
1
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Scope of Manual
1
. . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Description
1
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Specifications
3
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Educational Services
3
. . . . . . . . . . . . . . . . . . . . . . . . .
Maximum Pressure Limitations
3
. . . . . . . . . . . . . . . . . .
Installation
4
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Actuator Mounting
5
. . . . . . . . . . . . . . . . . . . . . . . . . .
Direct‐Acting
(Push‐Down‐to‐Close) Valves
5
. . . . . . . . . . . .
Reverse‐Acting
(Push‐Down‐to‐Open) Valves
6
. . . . . . . . . . . .
Loading Connection
8
. . . . . . . . . . . . . . . . . . . . . . . . . .
Adjustments
9
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Travel
9
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Spring
9
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Discussion of Bench Set
9
. . . . . . . . . . . . . . . . . . .
Adjustment Steps
10
. . . . . . . . . . . . . . . . . . . . . . .
Operation
11
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Maintenance
11
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Replacement of the Elastomeric Parts
12
. . . . . . . . . .
Size 40, 45, and 70 Actuators
12
. . . . . . . . . . . . .
Size 80 Actuators
13
. . . . . . . . . . . . . . . . . . . . . . .
Disassembly
14
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Size 40, 45, and 70 Actuators
14
. . . . . . . . . . . . .
Size 80 Actuators
14
. . . . . . . . . . . . . . . . . . . . . . .
Assembly
15
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Size 40, 45, and 70 Actuators
15
. . . . . . . . . . . . .
Size 80 Actuators
16
. . . . . . . . . . . . . . . . . . . . . . .
Parts Ordering
18
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Parts List
18
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Introduction
Scope of Manual
This manual provides installation, maintenance, and parts list information for the Fisher 667NS actuator. Refer to
separate instruction manuals for information regarding the control valve and accessories.
Do not install, operate, or maintain 667NS actuators 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 667NS actuator is a reverse‐acting, spring‐opposed diaphragm actuator that is used for operation of automatic
control valves. The 667NS actuator yoke construction and special bonnet‐to‐yoke bolting provides a high structural
resonant frequency that exceeds most nuclear service seismic requirements.
Instruction Manual
D102603X012
667NS Actuator
June 2018
