Emerson Fisher 657 And 667 Installation Instructions

2015-03-30

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Instruction Manual

657 Size 80 and 100 Actuators

D100307X012

December 2010

Fisherr 657 Diaphragm Actuators
Size 80 and 100
Contents
Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1
Scope of Manual . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1
Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2
Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
Actuator Mounting . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
Loading Connection . . . . . . . . . . . . . . . . . . . . . . 4
Adjustments . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
Travel . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
Spring . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
Size 80 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
Size 100 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
Maintenance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
Actuator . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
Size 80 Disassembly . . . . . . . . . . . . . . . . . . . . . . 7
Size 80 Assembly . . . . . . . . . . . . . . . . . . . . . . . . . 8
Size 100 Disassembly . . . . . . . . . . . . . . . . . . . . 10
Size 100 Assembly . . . . . . . . . . . . . . . . . . . . . . . 11
Size 80 Side‐Mounted Handwheel . . . . . . . . . . . . . 12
Disassembly . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
Assembly . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
Size 80 Hydraulic Snubber . . . . . . . . . . . . . . . . . . . . 13
Size 80 Top‐Mounted Handwheel
(Adjustable Up Travel Stop) . . . . . . . . . . . . . . . . 13
Disassembly . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
Assembly . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
Size 100 Top‐Mounted Handwheel
(Adjustable Up Travel Stop) . . . . . . . . . . . . . . . . 14
Disassembly . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15

Figure 1. Sectional view of Fisher 657
Size 100 Actuator

W0366‐1

Assembly . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
Parts Ordering . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
Parts List . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16

Introduction
Scope of Manual
This instruction manual provides information on installation, adjustment, maintenance, and parts ordering for the
Fisher 657 actuator in sizes 80 and 100. Refer to separate instruction manuals for information about other equipment
and accessories used with these actuators.
Do not install, operate, or maintain 657 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 Process Management sales office before
proceeding.

www.Fisher.com

Instruction Manual

657 Size 80 and 100 Actuators
December 2010

D100307X012

Table 1. Specifications
ACTUATOR SIZE

SPECIFICATIONS
Nominal Effective Diaphragm Area
Yoke Boss Diameters
Acceptable Valve Stem Diameters

Maximum Allowable Output Thrust

Maximum Travel

Maximum Casing Pressure for Actuator Sizing

Maximum Diaphragm Casing Pressure(2)
Material Temperature Capabilities

100

cm2

1761

2902

inch2

273

127

inch

5H(1)

25.4 or 31.8

31.8

50.8

1 or 1‐1/4

1‐1/4

inch

450
178

Standard Cast Iron
Construction

All Steel
Construction

62942

88075

200170

14150

19800

45000

inch

102
4

Standard Cast Iron
Construction

All Steel
Construction

bar

3.4

4.9

6.9

psig

100

bar

4.1

5.5

7.9

psig

115

-40 to 82

-40 to 180

Pressure Connections

1/4 NPT internal

Approximate Weights Without Handwheel

234

346

515

762

1. Heavy actuator‐to‐bonnet bolting.
2. This maximum casing pressure is not to be used for normal operating pressure.

Figure 2. Schematic Representation of Fisher 657 Actuator
AIR PUSHES STEM DOWN

SPRING LIFTS

AF3833‐A
A0792‐2

Description
The 657 actuator (figure 1) is a direct‐acting, spring‐opposed diaphragm actuator used for automatic operation of
control valves. The actuator positions the valve plug in response to varying pneumatic loading pressure on the
diaphragm. Figure 2 shows the operation of these actuators.
A 657 actuator can be furnished with either a top‐mounted or side‐mounted (size 80 only) handwheel assembly. A
top‐mounted handwheel assembly is normally used as an adjustable‐up travel stop. The size 100 top‐mounted

Instruction Manual
D100307X012

657 Size 80 and 100 Actuators
December 2010

handwheel may be used as an auxiliary manual actuator. A side‐mounted handwheel assembly is normally used as an
auxiliary manual actuator.

Specifications
Refer to table 1 for specifications of the 657 actuator. See the actuator nameplate for information about a specific
actuator.

Maximum Pressure Limitations
The casing and diaphragm of 657 actuators are pressure operated. The air pressure provides force to compress the
spring and stroke the actuator. The following explanations describe the maximum pressure limitation for 657
actuators. Refer to the nameplate, warning tag, and table 1 for maximum values.
D Maximum Casing Pressure for Actuator Sizing: This is defined as the maximum pressure that can be applied to
stroke the actuator, overcome unbalance forces, and provide seat load.
D Maximum Diaphragm Casing Pressure: If the maximum diaphragm casing pressure is exceeded, damage to the
diaphragm, casing, or actuator may result. This pressure is not to be used for normal operating pressure.

WARNING
To avoid personal injury or parts damage, do not exceed the Maximum Diaphragm Casing Pressure listed in table 1. The
Maximum Diaphragm Casing Pressure must not produce a force on the actuator stem greater than the maximum allowable
actuator output thrust or the maximum allowable stem load.

Installation
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.

When an actuator and valve body are shipped together, the actuator is normally mounted on the valve. Follow the
valve body instructions when installing the control valve in the pipeline. If the actuator is shipped separately or if it is
necessary to mount the actuator on the valve, perform the Actuator Mounting procedures as described below.
For information on mounting valve positioners, refer to the appropriate valve positioner instruction manual.

Actuator Mounting
1. To permit adjustment of the actuator spring, the size 100 actuator must be installed in a vertical position above the
valve body. Mount the actuator on the valve bonnet. Insert the cap screws, and tighten the hex nuts, securing the
actuator to the bonnet.

657 Size 80 and 100 Actuators

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December 2010

D100307X012

2. Screw valve stem locknuts (key 16, figure 4) all the way onto valve stem thread.
3. Connect an air supply to the diaphragm casing.
4. For push‐down‐to‐close valves, be sure the valve plug is on its seat. Apply pressure to ensure that the actuator stem
is fully extended. Reduce actuator loading pressure to retract the stem approximately 3.2 mm (1/8‐inch).
5. For push‐down‐to‐open valves, move valve plug to closed position. On large body sizes, this may require the use of
a pry bar inserted through the body line opening. If the body is installed in a pipeline, the bottom flange (if one is
used) can be removed and the valve plug pushed to the seat from the bottom opening. Pressure the actuator to
move the stem out 3.2 mm (1/8‐inch).

WARNING
To avoid personal injury due to the sudden uncontrolled movement of parts, do not loosen the stem connector cap screws
when the stem connector has spring or loading pressure force applied to it.

CAUTION
Incomplete engagement of both valve stem and actuator stem in the stem connector can result in stripped threads or
improper operation. Be sure that the length of each stem clamped in the stem connector is equal to or greater than the
diameter of that stem.

6. Clamp the actuator and valve plug stems between the two stem connector halves (key 26, figure 4). Insert and
tighten the stem connector cap screws.
7. Thread the stem locknuts against the stem connector.
8. Align the travel indicator scale (key 18, figures 4 and 5) to show valve position.

Loading Connection
1. Connect the loading pressure piping to the connection in the top of the diaphragm casing.
2. Remove the 1/4‐inch bushing (key 33, figure 4 and key 120, figure 5) to increase connection size, if necessary. The
connection can be made with either piping or tubing.
3. Keep the length of tubing or piping as short as possible to avoid transmission lag in the control signal. If an
accessory (such as a volume booster or valve positioner) is used, be sure that the accessory is properly connected to
the actuator. Refer to the positioner instruction manual as necessary.
4. Cycle the actuator several times to check that the valve stem travel is correct and that the travel occurs when the
correct pressure range is applied to the diaphragm.
5. If valve stem travel is incorrect, refer to the Travel procedure in the Adjustments section.
6. If the pressure range is incorrect, refer to the Spring procedure in the Adjustments section.

Adjustments
Travel
Make travel adjustments when the motion observed during actuator travel is different from the travel stamped on the
actuator nameplate. If the Actuator Mounting procedure was followed correctly, this adjustment should not be
necessary.

Instruction Manual

657 Size 80 and 100 Actuators

D100307X012

December 2010

When adjusting travel of a reverse‐acting (push‐down‐to‐open) valve, apply a slight pressure on the actuator
diaphragm. This moves the valve plug off the seat, reducing the chance of damaging the valve plug or seat during
adjustments.
1. Back the stem locknuts away from the stem connector, and slightly loosen the stem connector cap screws.

CAUTION
Do not use wrenches or other tools directly on the valve stem. Damage to the stem surface and subsequent damage to the
valve packing may result.

2. Tighten the locknuts together, using a wrench, then screw the valve stem either into the stem connector to
lengthen travel or out of the stem connector to shorten travel.
3. Cycle the actuator to check the travel. If actual travel is not equal to the specified travel, adjust and check travel
until correct. Tighten the stem connector cap screws when correct travel is obtained.
4. Raise the travel indicator disk by threading the stem locknuts against the stem connector.

Spring
Make spring adjustments when the loading pressure range applied to achieve specified travel is not equal to the
pressure range stamped on the actuator nameplate. Refer to the Bench Set pressure range on the nameplate when
the valve contains no pressure and the packing is loosely inserted in the bonnet. Refer to the Max. Allow. Supply on the
nameplate when the valve is controlling the specified pressure drop and the packing is tightened to stop leaks around
the stem.
Monitor loading pressure carefully when making adjustments. Do not exceed the pressure specifications of either the
loading regulator or the actuator casings.
Each actuator spring has a fixed pressure span. Changing the spring compression shifts the span up or down to make
valve travel coincide with the loading pressure range.

Size 80
Remove cover band (key 60, figure 4), insert a rod of approximately 12.7 mm (1/2‐inch) diameter into a hole in the
adjusting screw (key 12, figure 4), and rotate the adjusting screw with the rod. Rotating the screw from left to right
will increase the loading pressure required to start actuator stem travel; opposite rotation will decrease the pressure
required to start travel.

Size 100
CAUTION
The actuator must be in the vertical position when adjusting spring to avoid damage to thrust bearing (key 35, figure 5) and
to properly position spacers required for adjustment.

Remove the shroud plate (key 107, figure 5), and loosen the jam nut (key 115, figure 5).

Instruction Manual

657 Size 80 and 100 Actuators
December 2010

D100307X012

Figure 3. Dimension B for Spring Adjustment

B
JAM NUT
ADJUSTING NUT
SPRING SEAT
LOWER DIAPHRAGM CASING
A0950‐1

For small spring forces, adjustments can be made by rotating the adjusting nut (key 114, figure 5). Clockwise rotation
(when viewed from diaphragm casings) of the adjusting nut will increase the loading pressure required to start
actuator stem travel, and counterclockwise rotation will decrease the pressure required to start travel. Tighten the jam
nut when adjustment is complete.
For high spring forces, it is necessary to use spacers between the lower diaphragm casing and the spring seat to isolate
spring force from the adjusting nut.

WARNING
To avoid personal injury from the compressed actuator spring snapping back to its original length, make and use the
spacers by following the instructions in the steps below.
To avoid personal injury, keep hands and tools away from the spring and spring seat as instructed in the following
procedure.

1. It is recommended that three spacers be made of 3‐inch schedule 80 pipe cut to the appropriate length specified in
step 2. If other than the recommended material is to be used, be certain that the spacers are capable of
withstanding the spring force involved. The spacers must be of equal length with ends cut squarely.
2. Measure dimension B as shown in figure 3. Cut length of spacers as follows:
a. If it is desired to decrease spring compression, make the spacers approximately 4.8 mm (3/16‐inch) longer than
dimension B.
b. If it is desired to increase spring compression, make the spacers approximately 4.8 mm (3/16‐inch) shorter than
either dimension B plus the amount of adjustment required or dimension B plus valve travel, whichever is less.
3. Whenever the total amount of adjustment required is greater than valve travel, the adjustment must be made in
two or more steps, and the amount of adjustment taken in each step must be less than valve travel.
4. Pressure the actuator to attain full travel. Cautiously insert the spacers at equal intervals around the spring seat (key
11, figure 5). The spacers must be seated squarely when in use or they may slip out of position. Keeping hands and

Instruction Manual

657 Size 80 and 100 Actuators

D100307X012

December 2010

tools away from the spring and spring seat, slowly decrease loading pressure until the spring force holds the spacers
firmly between the spring seat and lower diaphragm casing (key 5, figure 5).
5. Loosen the jam nut. The adjusting nut can now be rotated clockwise (when viewed from the diaphragm casings) to
increase the loading pressure required to start actuator stem travel or counterclockwise to decrease the pressure
required to start travel.
6. Pressure the actuator to move the spring seat away from the spacers, and carefully remove the spacers.
7. If the total adjustment required was greater than valve travel, repeat the procedure. It will be necessary to make
new spacers using the new dimension B and the remaining adjustment required or valve travel, whichever is less.
Tighten the jam nut when adjustment is complete.

Maintenance
WARNING
Avoid personal injury or property damage from sudden release of process pressure or bursting of parts. Before performing
any maintenance operations:
D Do not remove the actuator from the valve while the valve is still pressurized.
D Always wear protective gloves, clothing, and eyewear when performing any maintenance operations to avoid personal
injury.
D Disconnect any operating lines providing air pressure, electric power, or a control signal to the actuator. Be sure the
actuator cannot suddenly open or close the valve.
D Use bypass valves or completely shut off the process to isolate the valve from process pressure. Relieve process pressure
from both sides of the valve. Drain the process media from both sides of the valve.
D Vent the power actuator loading pressure and relieve any actuator spring precompression.
D Use lock‐out procedures to be sure that the above measures stay in effect while you work on the equipment.
D The valve packing box may contain process fluids that are pressurized, even when the valve has been removed from the
pipeline. Process fluids may spray out under pressure when removing the packing hardware or packing rings, or when
loosening the packing box pipe plug.
D Check with your process or safety engineer for any additional measures that must be taken to protect against process
media.

The maintenance instructions are divided into four sections: actuator (sizes 80 and 100); side‐mounted handwheel
assembly (manual operator); hydraulic snubber; and top‐mounted handwheel assembly (adjustable‐up travel stop).

Actuator
This procedure describes how the actuator can be completely disassembled and assembled. When inspection or
repairs are required, disassemble only those parts necessary to accomplish the job; then, start the assembly at the
appropriate step.
Key numbers refer to figure 4 for size 80 actuators and figure 5 for size 100 actuators.

Size 80 Disassembly
1. Bypass the control valve. Reduce the loading pressure to atmospheric, and remove the tubing or piping from the
top of the diaphragm casing (key 1).

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WARNING
To avoid personal injury from the precompressed spring force thrusting the upper diaphragm casing (key 1) away from the
actuator, relieve spring compression (step 2, below), and carefully remove casing cap screws (key 22) (step 4, below).

2. Remove cover band (key 60). Insert a rod of approximately 12.7 mm (1/2‐inch) diameter into a hole in the adjusting
screw (key 12), and rotate the adjusting screw from right to left until spring compression is relieved. If the actuator
has a handwheel, rotate it counterclockwise, relieving all spring compression.
3. If necessary, the entire actuator may be removed from the valve body by unscrewing two cap screws from stem
connector (key 26) and removing actuator‐to‐bonnet bolting.
4. Unscrew diaphragm casing cap screws and nuts (keys 22 and 23), and lift off upper diaphragm casing (key 1).
5. Remove the molded diaphragm (key 2).
6. For actuators without snubber, remove diaphragm plate and stem (keys 4 and 10) as an assembly. This assembly
can be broken down further, if necessary, by removing the cap screw (key 3).
7. For actuators with snubber (see figure 7), unscrew cap screw (key 3), and remove diaphragm plate (key 4). Remove
stem connector (key 26). Unscrew cap screws (key 85), and remove cylinder assembly (key 74) and attached stem
and upper seat (keys 10 and 90) from actuator.
To disassemble snubber:
a. Unscrew stem from piston/piston rod assembly (key 27).
b. Remove retaining rings, cylinder heads, and piston/piston rod assembly (keys 76, 75, and 27). Replace packing
and O‐rings (keys 103, 104, 77 and 105) as required.
8. Remove actuator spring, upper sleeve, and spring seat (keys 6, 34 and 11).
9. Unscrew cap screws and nuts (keys 62 and 63), and remove spring case (key 29). Cap screws (key 62) on units with
side‐mounted handwheel do not use hex nuts (key 63).
10. For actuators without side‐mounted handwheel, remove adjusting flange (key 36) and attached thrust bearing
and adjusting screw (keys 35 and 12).
11. For actuators with side‐mounted handwheel (see figure 7), unscrew cap screws (key 64), and remove adjusting
flange (key 36) and attached thrust bearing and adjusting screw (keys 35 and 12). Do not lose the key (key 47).

Size 80 Assembly
1. Coat the threads of the adjusting flange (key 36) with anti‐seize lubricant (key 244). Replace the adjusting flange,
adjusting screw, and thrust bearing (keys 36, 12, and 35). Pack bearing with lithium grease lubricant (key 241).
For actuators with side‐mounted handwheel, install the key (key 47) on the adjusting flange (key 36). Coat the
adjusting flange threads with anti‐seize lubricant. Install the adjusting flange so that the key engages the slot in the
lower sleeve. Secure adjusting flange with cap screws (key 64). Adjust set screws (key 40, figure 7) to eliminate free
play in handwheel bearings.

Note
Over‐tightening the set screws will make handwheel operation difficult.

2. Mount the spring case (key 29) to the yoke (key 9) using cap screws and hex nuts (keys 62 and 63).

Instruction Manual

657 Size 80 and 100 Actuators

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December 2010

3. Position the lower spring seat (key 11), and slide the actuator spring (key 6) squarely onto the spring seat.
4. If the diaphragm plate and actuator stem (keys 4 and 10) were separated, fasten them together using the cap
screw (key 3) and tighten to a torque of 544 NSm (400 lbfSft).
For actuators without a hydraulic snubber, slide upper sleeve (key 34) onto the actuator stem, and then slide upper
sleeve, actuator stem and diaphragm plate into the spring case (key 29) so that the spring (key 6) fits squarely
between the diaphragm plate and the spring seat (key 11).
For actuators with a snubber, thread the actuator stem and upper spring seat (keys 10 and 90) into the piston/piston
rod assembly (key 27). Install the snubber assembly and attached actuator stem into the upper sleeve, spring case
adaptor, and spring case (keys 34, 72, and 29). Secure with cap screws (key 85).
5. Place the diaphragm (key 2) with pattern side facing away from the diaphragm plate (key 4). Align the holes in the
diaphragm and the lower diaphragm casing (key 5).
6. Position the upper diaphragm casing (key 1) on the diaphragm (key 2), and align the holes.

Note
When you replace actuator diaphragms in the field, take care to ensure the diaphragm casing bolts are tightened to the proper
load to prevent leakage, but not crush the material. Perform the following tightening sequence with a manual torque wrench for
size 80 and 100 actuators.

CAUTION
Over‐tightening the diaphragm casing cap screws and nuts can damage the diaphragm. Do not exceed the following
maximum torque values for the appropriate diaphragm material:
EPDM/Meta‐Aramid: 95 NSm (70 lbfSft) Nitrile, Silicone, FKM (fluorocarbon)/Meta‐Aramid: 68 NSm (50 lbfSft)

Table 2. Maximum Torque Values
DIAPHRAGM MATERIAL

INITIAL TORQUE
NSm (lbfSft)

FINAL TORQUE
NSm (lbfSft)

EPDM/Meta‐Aramid

41 (30)

82, +/-13 (60, +/-10)

Nitrile, Silicone, FKM/Meta‐Aramid

34 (25)

68 (50)

Note
Do not use lubricant on these bolts and nuts. Fasteners must be clean and dry.

7. Insert the cap screws (key 22) into the diaphragm casing, and tighten the hex nuts (key 23) in the following
manner. The first four hex nuts tightened should be diametrically opposed and 90 degrees apart. Tighten these four
hex nuts to the initial torque value found in table 2 for the diaphragm material being used.
8. Tighten the remaining hex nuts in a clockwise, criss‐cross pattern to the initial torque value found in table 2 for the
diaphragm material being used.
9. Repeat this procedure by tightening four hex nuts, diametrically opposed and 90 degrees apart, to the final torque
value that is specified in table 2 for the diaphragm material being used.

657 Size 80 and 100 Actuators

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10. Tighten the remaining hex nuts in a clockwise, criss‐cross pattern to the final torque value that is specified in table
2 for the diaphragm material being used.
11. After the last hex nut is tightened complete another tightening sequence, this time in a circular pattern around
the bolt circle to the final torque value that is specified in table 2 for the diaphragm material being used.
12. Once completed, no more tightening is recommended.
13. Mount the actuator on the valve in accordance with the procedures in the Installation section.

Size 100 Disassembly
Key numbers used in the following procedure are shown in figure 5 except when indicated.

Note
Two construction variations of the size 100 are based on spring length. Group 1 springs have a free length of 845 mm (33‐1/4
inches), and group 2 springs have a free length of 419 mm (16‐1/2 inches).

WARNING
To avoid personal injury from the precompressed spring force thrusting the upper diaphragm casing (key 1) away from the
actuator, relieve spring compression (step 1, below), and carefully remove casing cap screws (key 22) (step 7, below).

1. Remove shroud plate (key 107), loosen jam nut (key 115), and rotate adjusting nut (key 114) until spring
compression is relieved.

Note
To relieve spring compression when high spring forces exist, refer to the Adjusting Actuator Spring section, and follow the
instructions given for size 100 actuators with high spring forces.

2. Remove the pressure tubing or piping from the top of the diaphragm casing.
3. For actuators with top‐mounted handwheel, rotate handwheel (key 51, figure 8) counterclockwise as far as it will
go, unscrew cap screws (key 109, figure 5), and remove handwheel and gear case assembly (key 65, figure 8).
4. For actuators without top‐mounted handwheel, unscrew cap screws (key 109), and remove diaphragm casing
cover (key 123).
5. If necessary, remove the actuator from the valve body by separating the stem connector (key 26) and removing the
actuator‐to‐bonnet bolting. Separate the stem connector by loosening the stem locknuts (key 16) and unscrewing
the four cap screws.
6. Unscrew and remove actuator stem extension (key 116).
7. Unscrew cap screws (key 22), and remove upper diaphragm casing (key 1).
8. Remove backup plate, diaphragm retainer, diaphragm, diaphragm plate, and washer (keys 13, 110, 2, 4, and 117).
9. Unscrew the nuts that attach lower diaphragm casing (key 5) to actuator tie rods (key 21).
10. Remove lower diaphragm casing from tie rods and remove hex jam nut, adjusting nut thrust bearing (used with
group 1 springs only), and spring seat (keys 115, 114, 35, and 11).

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December 2010

11. Remove seal bushing (key 111) and diaphragm casing cover O‐rings (keys 112 and 113) from upper diaphragm
casing (key 123). Replace with new parts if necessary. Apply lithium grease lubricant to the O‐rings.
12. Remove actuator spring (key 6).

Size 100 Assembly
Note
Units using a group 2 spring require one spring seat (key 11) on each end of the spring (key 6); units using a group 1 spring require
only one spring seat on the diaphragm end of the spring as shown in figure 5.

1. Place the spring and spring seats (keys 6 and 11) inside the spring case.
2. For actuators using a group 1 spring, pack the thrust bearing (key 35) with lithium grease lubricant (key 241). Place
bearing on the spring seat.
3. Screw the hex jam nut and adjusting nut (keys 115 and 114) onto the actuator stem.
4. Install the lower diaphragm casing (key 5) on the actuator tie rods (key 21). Secure with hex nuts.

Note
Before installing diaphragm plate (key 4), rotate adjusting nut (key 114) until the top of the actuator stem is 264 mm (10‐3/8
inches) above the inside surface of the lower casing (key 5).
When installing diaphragm (key 2), be certain that the rubber side of the diaphragm faces away from the spring.

CAUTION
To avoid product damage, smooth the edge of the diaphragm to avoid wrinkling, and be careful that the diaphragm fold
does not get pinched when the upper casing (key 1) is installed.

5. Install washer, diaphragm plate, diaphragm, diaphragm retainer, and backup plate (keys 117, 4, 2, 110 and 13).
6. Apply lithium grease lubricant (key 241) to the thread on the diaphragm end of the actuator stem (key 10).
7. Position the upper diaphragm casing (key 1) on the diaphragm (key 2), and align the holes.

Note
If backup plate (key 13) interferes with installation of upper casing, rotate adjusting nut (key 114) to move the plate.

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CAUTION
Over‐tightening the diaphragm casing cap screws and nuts can damage the diaphragm. Do not exceed 68 NSm (50 lbfSft)
torque.

Note
Do not use lubricant on these bolts and nuts. Fasteners must be clean and dry.

8. Insert the cap screws (key 22), and tighten the hex nuts (key 23) in the following manner. The first four hex nuts
tightened should be diametrically opposed and 90 degrees apart. Tighten these four hex nuts to 34 NSm (25 lbfSft).
9. Tighten the remaining hex nuts in a clockwise, criss‐cross pattern to 34 NSm (25 lbfSft).
10. Repeat this procedure by tightening four hex nuts, diametrically opposed and 90 degrees apart, to a torque of 68
NSm (50 lbfSft).
11. Tighten the remaining hex nuts in a clockwise, criss‐cross pattern to 68 NSm (50 lbfSft).
12. After the last hex nut is tightened to 68 NSm (50 lbfSft), all of the hex nuts should be tightened again to 68 NSm
(50 lbfSft) in a circular pattern around the bolt circle.
13. Once completed, no more tightening is recommended.
14. Install the actuator stem extension (key 116), diaphragm casing cover O‐rings (keys 112 and 113), and seal
bushing (key 111). Install the gear case cover (key 123) or the handwheel assembly (see figure 8).
15. Mount the actuator on the valve, and secure with the actuator‐to‐bonnet bolting. Refer to the Installation section
to connect actuator stem to valve plug stem.

Size 80 Side‐Mounted Handwheel
The side‐mounted handwheel assembly (figure 7) is normally used as a manual operator. The handwheel can be
mounted in either of two positions so that, regardless of valve plug action, counterclockwise rotation always opens
the valve. The assembly is a continuously connected type with an indicator to show neutral position. By rotating
handwheel away from neutral, the handwheel can be used to limit travel in either direction but not both directions at
the same time.
A grease fitting is provided on the gear box for periodic gear lubrication with a general‐purpose grease.
Instructions are given below for complete disassembly and assembly. Perform the disassembly only as far as necessary
to accomplish the required maintenance; then, begin the assembly at the appropriate step.
Key numbers refer to figure 7.

Disassembly
1. Complete steps 1 through 9 of the disassembly portion of the size 80 actuator section.
2. Unscrew cap screws (key 64), and remove adjusting flange (key 36). Do not lose the key (key 47).
3. Unscrew the two screws (key 28), and remove travel stop indicator (key 58) from lower sleeve (key 46).
4. Turn handwheel (key 51) to raise lower sleeve. Continue turning handwheel until lower sleeve is free of worm gear
(key 44). Lift out lower sleeve, bearing and gear retainer, thrust bearings, and worm gear (keys 46, 66, 67, and 44).
5. The worm shaft (key 45) and associated parts can be removed in order to replace or lubricate them. First, remove
the handwheel cap (key 54) and the handwheel (key 51). Do not lose the small ball or spring (keys 55 and 56).

Instruction Manual

657 Size 80 and 100 Actuators

D100307X012

December 2010

6. Loosen the two set screws (key 41), and unscrew the two worm retainers (keys 48 and 49). The ball bearings (key
50) will come out with the retainers. Remove the worm shaft (key 45).

Assembly
1. Pack the ball bearings (key 50) with lithium grease lubricant, and insert one ball bearing in the back worm retainer
(key 49) as shown in figure 7 (section C‐C).
2. Thread the back worm retainer and ball bearing (keys 49 and 50) into the gear case. Align the slot in the worm
retainer with the set screw hole in the gear case, insert the set screw (key 41), and tighten it.
3. Coat the worm shaft (key 45) threads with anti‐seize lubricant (key 244), and slide the shaft into the gear case so
that the end of the shaft fits snugly in the back worm retainer.
4. Insert the bearing in the front worm retainer
(key 48), and thread the retainer and ball bearing into the gear case. Align the slot in the retainer with the set screw
hole in the gear case, insert the set screw (key 41), and tighten it.
5. Put the spring and ball (keys 56 and 55) in the handwheel (key 51). Slide the handwheel onto the worm shaft (key
45). Thread the handwheel cap (key 54) onto the worm shaft.
6. Pack the two thrust bearings (key 67) with lithium grease lubricant. Install one thrust bearing; then, install the
worm gear (key 44) followed by the second thrust bearing and the bearing and gear retainer (key 66).
7. The lower sleeve (key 46) has two screw holes in one end. Coat the sleeve threads with lithium grease lubricant,
slide the end of the lower sleeve with the holes into the thrust bearing (key 67), turn the handwheel, and feed the
sleeve through the worm gear. Continue turning the handwheel until the lower sleeve protrudes from the gear
case. Fasten the travel stop indicator (key 58) to the sleeve with the two machine screws (key 28).
8. Install the key (key 47) on the adjusting flange (key 36). Coat the adjusting flange threads with anti‐seize lubricant
(key 244). Install the adjusting flange so that the key engages the slot in the lower sleeve. Secure adjusting flange
with cap screws (key 64).
9. Adjust set screws (key 40) to eliminate free play in the bearings.

Note
Over‐tightening the set screws will make handwheel operation difficult.

10. Install the adjusting screw and thrust bearings (keys 12 and 35). Pack bearings with lithium grease lubricant (key
241), and install as shown in figure 7.
11. Slide the spring case (key 29) into position, and secure with cap screws (key 62).
12. Complete steps 3 through 8 of the size 80 actuator assembly section.

Size 80 Hydraulic Snubber
The size 80 657 is available with a hydraulic snubber, as shown in figure 7, to dampen vertical instability of actuator
stem movement. The snubber is adjusted by rotating the adjusting screws (key 83, figure 7) counterclockwise out of
the reservoir (key 79, figure 7) to increase damping action and clockwise to decrease damping action. The adjusting
screw on the right (the lower of the two adjusting screws in section B‐B of figure 7) regulates downward damping
action, and the screw on the left regulates upward damping action.

Size 80 Top‐Mounted Handwheel (Adjustable Up Travel Stop)
CAUTION
If repeated or daily manual operation is expected, and the actuator is equipped with a casing‐mounted travel stop or
top‐mounted handwheel, the diaphragm could be subject to excessive wear.

657 Size 80 and 100 Actuators

Instruction Manual

December 2010

D100307X012

The actuator should be equipped with a side‐mounted handwheel, which is designed for more frequent use as a manual
operator.

A top‐mounted handwheel assembly is normally used as an adjustable‐up travel stop to limit full retraction of the
actuator stem. Turning the handwheel clockwise turns the handwheel stem (key 133, figure 6) into the diaphragm
casing and forces the pressure block assembly (key 179, figure 6) against the diaphragm and diaphragm plate.
Instructions are given below for complete disassembly and assembly. Perform the disassembly only as far as necessary
to accomplish the required maintenance; then, begin the assembly at the appropriate step.
Key numbers refer to figure 4 for actuator parts and figure 6 for handwheel parts.

Disassembly
1. Bypass the control valve. Reduce the loading pressure to atmospheric, and remove the tubing or piping from the
diaphragm casing (key 1).

2. Remove cover band (key 60). Insert a rod of approximately 12.7 mm (1/2‐inch) diameter into a hole in the adjusting
screw (key 12), and rotate the adjusting screw from right to left until spring compression is relieved. Rotate
handwheel to be sure it is not compressing actuator spring.
3. Unscrew cap screws (key 141), and remove handwheel assembly.
4. Remove hex nut (key 54), and lift off the handwheel.
5. Unscrew support screws (key 182), and remove pressure block, stem, stem collar, and thrust bearing (keys 179,
133, 183, and 175).
6. Unscrew body nut (key 186), and remove gland (key 180). If necessary, remove and replace packing rings (key
181).

Assembly
1. Install new packing rings and gland (keys 181 and 180), and thread the body nut (key 186) onto the body.
2. Lubricate the thrust bearing and stem (keys 175 and 133), with lithium grease lubricant (key 241). Slide stem, stem
collar, thrust bearing, and pressure block (keys 133, 183, 175, and 179) into the body as shown in figure 6 and
install support screws (key 182).
3. Install handwheel and hex nut (keys 51 and 54).
4. Install a new handwheel gasket (key 185).
5. Mount the handwheel assembly on the diaphragm casing, and secure with cap screws (key 141).
6. Reconnect pressure tubing or piping to actuator casing.

Size 100 Top‐Mounted Handwheel (Adjustable Up Travel Stop)
A top‐mounted handwheel assembly is normally used as an adjustable‐up travel stop to limit full retraction of the
actuator stem. Clockwise rotation of the handwheel (key 51) moves the actuator stem (key 10) downward,
compressing the spring (key 6). Spring action returns the stem as the handwheel is turned counterclockwise.

Instruction Manual
D100307X012

657 Size 80 and 100 Actuators
December 2010

Instructions are given below for complete disassembly and assembly. Perform the disassembly only as far as necessary
to accomplish the required maintenance; then, begin the assembly at the appropriate step.
Key numbers refer to figure 5 for actuator parts and figure 8 for handwheel parts.

Disassembly
1. Bypass the control valve. Reduce the loading pressure to atmospheric (refer to the Maintenance section), and
remove the tubing or piping from the diaphragm casing.

2.
3.
4.
5.
6.
7.
8.

Rotate handwheel counterclockwise, relieving all spring compression.
Unscrew cap screws (key 124), and remove gear case cover (key 123).
Loosen the set screws (key 41) in the front and back worm retainers (keys 48 and 49) and handwheel (key 51).
Remove retaining ring (key 118), and remove handwheel.
Remove front and back worm retainers (keys 48 and 49).
Remove worm shaft (key 45).
Pull the power screw assembly (key 122). The bearing and gear retainer, thrust bearing, and worm gear (keys 66, 67
and 44) will come out with the power screw.

Assembly
1. Pack the ball bearings (key 50) with lithium grease lubricant (key 241), and insert one ball bearing into the back
worm retainer (key 49).
2. Thread the back worm retainer and ball bearing into the gear case. Align the slot in the worm retainer with the set
screw hole in the gear case, insert set screw (key 41), and tighten.
3. Coat the worm shaft (key 45) threads with lithium grease lubricant, and slide the shaft into the gear case so that the
end of the shaft fits snugly in the back worm retainer.
4. Insert the bearing into the front worm retainer (key 48), and thread the retainer and ball bearing into the gear case.
Align the slot in the retainer with the hole in the gear case, insert the set screw (key 41), and tighten.
5. Slide the handwheel onto the worm shaft (key 45), and install retaining ring (key 118).
6. Pack the two thrust bearings (key 67) with lithium grease lubricant. Install one thrust bearing, then the worm gear
(key 44), followed by the second thrust bearing and the bearing and gear retainer (key 66).
7. Coat the power screw threads (key 122) with lithium grease lubricant. Slide the power screw into the thrust bearing
(key 67), turn the handwheel, and feed the sleeve through the worm gear.
8. Adjust set screws (key 40) to eliminate free play in the bearings.

Note
Over‐tightening the set screws will make handwheel operation difficult.

9. Install gear case cover (key 123), and tighten cap screws (key 124).

Parts Ordering
Each actuator has a serial number stamped on the nameplate. Always refer to this number when corresponding with
your Emerson Process Management sales office regarding replacement parts or technical information. Also, always
refer to the 11‐character part number of each needed part as found in the following parts list.

Instruction Manual

657 Size 80 and 100 Actuators
December 2010

D100307X012

WARNING
Use only genuine Fisher replacement parts. Components that are not supplied by Emerson Process Management should not,
under any circumstances, be used in any Fisher valve, because they may void your warranty, might adversely affect the
performance of the valve, and could cause personal injury and property damage.

Note
Neither Emerson, Emerson Process Management, nor any of their affiliated entities assumes responsibility for the selection, use, or
maintenance of any product. Responsibility for the selection, use, and maintenance of any product remains with the purchaser and
end‐user.

Parts List
Note
Part numbers are shown for recommended spares only. For part
numbers not shown, contact your Emerson Process Management sales
office.

657 Sizes 80 & 100
Key

Description

1
2*
3
4
5
5
6
8
9
10
11
12
13
14
16
17
18
19

Upper Diaphragm Casing
Diaphragm
Size 80
Nitrile
1R6375X0072
Silicone
18B2713X132
Size 100, nitrile & TPES (thermoplastic polyester) 20A2551X012
Cap Screw
Diaphragm Plate
Lower Diaphragm Casing
Lower Diaphragm Casing, Yoke, &
Tie Rod Ass'y
Spring
See tables
Cap Screw
Yoke
Actuator Stem
Spring Seat
Adjusting Screw
Backup Plate
Travel Indicator
Hex Jam Nut
Machine Screw
Travel Indicator Scale
Nameplate

Part Number

Key

Description

20
21
22
23
26
28
29
33
34
35
36
60
62
63
88
89
91
92
106
107
108
109
110
111*
112*
113*
114
115
116
117
118
120
121
123
128
241
244
245*

Drive Screw
Actuator Tie Rod
Cap Screw
Hex Nut
Stem Connector Ass'y
Cap Screw
Spring Case
Pipe Bushing
Upper Sleeve
Thrust Bearing
Adjusting Flange
Cover Band Ass'y
Cap Screw
Hex Nut
Tie Rod Washer
Hex Nut
Spring Guide
Cap Screw
Washer
Shroud Plate
Self‐tapping screw
Cap Screw
Diaphragm Retainer
Seal Bushing, brass
Size 100
O‐Ring, nitrile (2 req'd) Size 100
O‐Ring, nitrile Size 100
Hex Nut
Hex Jam Nut
Actuator Stem Extension
Washer
Retaining Ring
Hex Bushing
Lifting Pin
Diaphragm Casing Cover
Vent Ass'y
Lithium grease (not furnished with actuator)
Anti‐seize lubricant (not furnished with actuator)
O‐Ring, nitrile Size 100 only

*Recommended spare parts

Part Number

20A2582X012
1H8627X0042
1R834206992

‐‐‐
‐‐‐
1C339006992

Instruction Manual
D100307X012

657 Size 80 and 100 Actuators
December 2010

Figure 4. Size 80 Fisher 657 Actuator

APPLY LUB
40A8771‐B

657 Size 80 and 100 Actuators
December 2010

Figure 5. Size 100 Fisher 657 Actuator

APPLY LUB
50A2621‐F

Instruction Manual
D100307X012

Instruction Manual

657 Size 80 and 100 Actuators

D100307X012

December 2010

Key 6 Size 80 Actuator Spring, steel
COMPRESSION
RATE

SIZE

MAXIMUM
LOAD

Lb/in

N/mm

335
1000
1650
2100
2600
3100

58.7
175.1
288.9
367.7
455.3
542.8

2480
5630
7900
10,600
10,600
13,800

11,031
25,042
35,139
47,148
47,148
61,382

PART
NUMBER

COLOR
CODE

1J518227082
1H747727082
1H747527082
1H747327082
1H747627082
1H747027082

White
Red
Lt. Blue
Yellow
Lt. Green
White

Key 6 Size 100 Actuator Spring
GROUP

COMPRESSION
RATE

MAX LOAD

PART
NUMBER

COLOR
CODE

77,840
111,200
160,128
200,160

10A2561X012
10A2562X012
10A2563X012
10A2564X012

None
None
None
None

11,031
25,042
35,139
47,148
47,148
61,382

1J518227082
1H747727082
1H747527082
1H747327082
1H747627082
1H747027082

Brown
Red
Blue
Yellow
Green
White

Lb/in

N/mm

1
33‐1/4 Inch (844 mm)
Free Length

1775
2950
4500
6000

310.8
516.5
787.9
1050.6

17,500
25,000
36,000
45,000

2
16‐1/2 Inch (419 mm)
Free Length

335
1000
1650
2100
2600
3100

58.6
175.1
288.9
367.7
455.2
542.8

2480
5630
7900
10,600
10,600
13,800

Figure 6. Top‐Mounted Handwheel for Size 80 Actuator

APPLY LUB
CV8009‐E

Instruction Manual

657 Size 80 and 100 Actuators
December 2010

D100307X012

Size 80 Side‐Mtd Handwheel
Key

7
17
28
40
41
44
45
46
47
48
49
50
51
52
53
54
55
56
58
61
64
65
66
67
68
69
70
71
243

Description

Part Number

Travel Stop
Machine Screw
Machine Screw
Set Screw
Set Screw
Worm Gear
Worm Shaft
Lower Sleeve
Key
Front Worm Retainer
Back Worm Retainer
Ball Bearing
Handwheel
Handgrip
Handgrip Bolt
Handwheel Cap
Ball
Spring
Travel Indicator
Grease Fitting
Cap Screw
Gear Case
Bearing & Gear Retainer
Thrust Bearing
Cap Screw
Indicator Scale
Stop Indicator Bracket
Machine Screw
Pliable sealant (not furnished with actuator)

Handwheel
Nut
Stem
Cap Screw
Handwheel Body
Thrust Bearing
Pressure Block
Gland
Packing Ring, TFE‐graphite (2 req'd)
Support Screw
Stem Collar
Retaining Ring
Gasket, composition
Body Nut
Lithium grease (not furnished with actuator)
Spacer
Cotter Pin

Key

Description

17
40
41
44
45
48
49
50
51
61
65
66
67
118
122
123
124
125
126
127

Machine Screw
Set Screw
Set Screw
Worm Gear
Worm Shaft
Front Worm Retainer
Back Worm Retainer
Ball Bearing
Handwheel
Grease Fitting
Gear Case
Bearing & Gear Retainer
Thrust Bearing
Retaining Ring
Power Screw Ass'y
Gear Case Cover
Cap Screw
Hex Jam Nut
Woodruff Key
Slot Cover

Part Number

Size 80 Hydraulic Snubber

‐‐‐

Size 80 Top‐Mtd Handwheel
(Adjustable Up Travel Stop)
51
54
133
141
142
175
179
180
181*
182
183
184
185*
186
241
246
247

Size 100 Top‐Mtd Handwheel
(Adjustable Up Travel Stop)

1D7496X0012

1J789504022

27
63
72
73
74
75
76
77*
78*
79
80*
81
82*
83
84
85
86
87
90
93
94*
95
96
97
98
99
100
101
102
103*
104*
105*

Piston/Piston Rod Ass'y
Hex Nut
Spring Case Adaptor
Cap Screw
Cylinder
Cylinder Head
Retaining Ring
O‐Ring, nitrile (2 req'd)
Piston Ring, iron (2 req'd)
Reservoir
O‐Ring, nitrile
Cap Screw
O‐Ring, nitrile (2 req'd)
Valve Adj Screw
Jam Nut
Cap Screw
Pipe Plug
Pipe Plug
Upper Spring Seat
Hydraulic Fluid
O‐Ring, nitrile (2 req'd)
Orifice
Bypass & Check Valve Plug
Spring
E‐Ring
Bushing
Flange
Packing Sleeve
Machine Screw
Packing, nitrile (8 req'd)
Packing, CR (chloroprene) & cotton (4 req'd)
Packing Sleeve O‐Ring, nitrile (2 req'd)

*Recommended spare parts

1F449206992
1C710321992
1H624706992
1D687506992

1E591406992

1P540806992
1P540906992
1P541206992

Instruction Manual

657 Size 80 and 100 Actuators

D100307X012

December 2010

Figure 7. Size 80 Fisher 657 Actuator with Side‐Mounted Handwheel and Hydraulic Snubber

SECTION B‐B

B
VIEW A

VIEW A

SECTION C‐C

APPLY LUB
50A8774‐C

Instruction Manual

657 Size 80 and 100 Actuators
December 2010

D100307X012

Figure 8. Top‐Mounted Handwheel for Size 100 Actuator

SECTION A‐A

APPLY LUB
50A2622‐F

Instruction Manual
D100307X012

657 Size 80 and 100 Actuators
December 2010

Instruction Manual
D100307X012

Fisher is a mark owned by one of the companies in the Emerson Process Management business division of Emerson Electric Co. Emerson Process
Management, Emerson, and the Emerson logo are trademarks and service marks of Emerson Electric Co. All other marks are the property of their respective
owners.
The contents of this publication are presented for informational purposes only, and while every effort has been made to ensure their accuracy, they are not
to be construed as warranties or guarantees, express or implied, regarding the products or services described herein or their use or applicability. All sales
are governed by our terms and conditions, which are available upon request. We reserve the right to modify or improve the designs or specifications of
such products at any time without notice. Neither Emerson, Emerson Process Management, nor any of their affiliated entities assumes responsibility for the
selection, use or maintenance of any product. Responsibility for proper selection, use, and maintenance of any product remains solely with the purchaser
and end user.
Emerson Process Management
Marshalltown, Iowa 50158 USA
Sorocaba, 18087 Brazil
Chatham, Kent ME4 4QZ UK
Dubai, United Arab Emirates
Singapore 128461 Singapore

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Emerson Fisher 657 And 667 Installation Instructions

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