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Fisher
™
656 Diaphragm Actuator
Contents
Introduction
1
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Scope of Manual
1
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Description
1
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Principle of Operation
2
. . . . . . . . . . . . . . . . . . . . . . . . .
Specifications
2
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Maximum Pressure Limitations
3
. . . . . . . . . . . . . . . .
Installation
3
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Adjustment
3
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Maintenance
4
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Disassembly
4
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Assembly
5
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Parts Ordering
7
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Parts List
7
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Handwheel Assembly
7
. . . . . . . . . . . . . . . . . . . . . . . .
Casing‐Mounted Adjustable Down
Travel Stop
11
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Figure 1. Fisher 656 Actuator
W0454
Introduction
Scope of Manual
This instruction manual includes installation, maintenance, and parts information for Fisher 656 diaphragm actuators.
Refer to separate manuals for instructions covering the valve, positioner, and accessories.
Description
Fisher 656 actuators are long stroke, spring opposed, direct‐acting diaphragm actuators. They operate Vee‐Ball
t
control valves, butterfly valves, built‐in turbine valves, louvers, dampers and similar equipment. They are suitable for
either push‐down‐to‐close (PDTC) or push‐down‐to‐open (PDTO) applications and are available in sizes 30, 40 and 60
to provide 54 mm (2.125 inch), 64 mm (3.5 inch) and 105 mm (4.125 inch) travel, respectively.
Do not install, operate, or maintain a 656 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.
Instruction Manual
D100304X012
656 Actuator
June 2017
