Emerson Fisher 656 Data Sheet
656 Actuator
D100086X012
Fisherr 656 Diaphragm Actuator
The Fisher 656 actuator is a bracket-mounted,
direct-acting, diaphragm actuator for either throttling
or on-off service. Principal applications include
operation of butterfly valves and built-in turbine
valves, louvers, dampers, and other similar equipment.
Features
Mounting Versatility–Four tapped holes in the
actuator base permit either bracket or plate
mounting.
Product Bulletin
61.1:656
February 2013
Long Actuator Travel–Deep casings provide up to
105 mm (4.125 inches) of maximum travel with a
size 60 actuator.
Application Versatility–Wide spring selection is
available for nearly any control application. Spring
selection procedures are quick and accurate.
Severe Service Capability–Rugged yoke and casings
provide stability and corrosion resistant protection.
Installation
The actuator may be installed in any position.
Dimensions are shown in figure 1.
W1996-2
YOKE
W0454-1
TRAVEL STOP
ADJUSTING SCREW
SPRING SEAT
BEARING
BEARING SEAT
TYPICAL CONSTRUCTION
Fisher 656 Actuator
www.Fisher.com
Product Bulletin
61.1:656
February 2013
Specifications
656 Actuator
D100086X012
Maximum Recommended Casing Operating
Pressure
(1)
2.4 bar (35 psig)
(1a)
(2)(4)
,
Maximum
Diaphragm
Casing
Pressure
Bar (Psig)
Maximum Allowable Casing Pressure
Maximum
Actuator
Size
30 8.6 (125) 1.0 (15) 9.7 (140)
40 4.5 (65) 0.69 (10) 5.2 (75)
60 2.8 (40) 0.69 (10) 3.4 (50)
1a. Additional pressure may be added when the actuator is at full t ravel.If the
Maximum Excess DiaphragmPressure is exceeded,damage to the diaphragm or
diaphragm casing mightresult. Seethe Maximum Pressure Limitation section.
2a. Maximum diaphragmcasing pressuremust not beexceeded and must not
produce a force on the actuator stem greater than the maximumallowable actuator
output thrust or the maximumallowable stem load. See theMaximum Pressure
Limitation section.
3a. This maximumcasing pressure is not to be used fornormal operating pressure.Its
purpose is toallow for typical regulator supplysettings and/or relief valve tolerances.
Casing
Pressure for
Actuator
(2a)
Sizing
Bar (Psig)
,
Maximum
Excess
Diaphragm
Pressure
Bar (Psig)
Net Stem Force Output
See table 1
Springs Commonly Used with Rotary Valves
(2a,3a)
,
Operating Temperature Range
J -40 to 82C(-40to180F) with Nitrile Elastomer
J
-40 to 149C(-40to300F) with Silicone
Diaphragm
Construction Materials
Part Description Construction Material
Diaphragm Nitrile
Diaphragm plate and yoke Cast iron
Diaphragm casings, spring,
spring seats, travel stop, stem,
bearings, bearing seat, and
bearing race
Adjustment screw Brass
Casing Pressure Connection
1/4 NPT internal
Mounting and Stem Thread Information
Seefigure1
Actuator Weight
See table 2
Maximum Travel
Actuator Size
MAXIMUM RATED STEM
ACTUATOR SIZE
30 54 (2.125) Not available
40 89 (3.5) 76 (3)
60 105 (4.125) 97 (3.8125)
1. Control andstability may be impaired ifthis pressure isexceeded.
2. Exceeding thispressure can cause damage to the diaphragm, diaphragmcasing, or other parts.
3. For fluidand temperature capabilities of optionalmaterials, consultyour Emerson Process Management sales office
4. The pressure/temperaturelimits in this bulletinand any applicable standard or code limitation forvalve should not be exceeded
TRAVEL mm (INCHES)
Standard
Travel Stop
Optional
Travel Stop
Options
Top-mounted handwheel/adjustable travel stop
(4)
(3)
(standard)
Steel
Approximate
Shipping Weight,
kg (Pounds)
30 23 (50)
40 32 (70)
60 73 (160)
Ordering Information
When ordering, specify:
1. Actuator type and size
2. Spring range (see table 2)
3. Handwheel or optional travel stop
4. Loading pressure range and volume requirement
2
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