Emerson Fisher 667 User manual

www.Fisher.com
Fisher™667 Diaphragm Actuator
Sizes 30/30i‐76/76i and 87
Contents
Introduction 1...................................
Scope of Manual 1.............................
Description 2.................................
Specifications 3...............................
Educational Services 3.........................
Instructional Videos 3..........................
Maximum Pressure Limitations 4................
Installation 4
....................................
Mounting the Actuator on the Valve 5............
Discussion of Bench Set 7.......................
Spring Verification 7...........................
Installing the Stem Connector Assembly 9.........
Friction Discussion 10..........................
Deadband Measurement 11.....................
Loading Connection 12.........................
Maintenance 12
.................................
Actuator 13..................................
Top‐Mounted Handwheel Assembly
(Adjustable Down Travel Stop) 15.............
Side‐Mounted Handwheel for Sizes 34/34i
through 60/60i Actuators 19..................
Side‐Mounted Handwheel Assembly for
Size 70, 76, and 87 Actuators 21...............
Casing‐Mounted Travel Stops 23.................
Parts Kits 24
.....................................
Side‐Mounted Handwheels Retrofit Kits 24........
Top‐Mounted Handwheel Retrofit Kits 25.........
Actuator Repair Kits 24.........................
Figure 1. Fisher 667 Actuator Mounted on easy‐e™
Valve
X1182
Parts List 25.....................................
Actuator Assembly 25..........................
Top‐Mounted Handwheel 26...................
Side‐Mounted Handwheel (34/34i‐60/60i) 37.....
Side‐Mounted Handwheel (70, 76, and 87) 37....
Casing Mounted Travel Stops 39.................
Introduction
Scope of Manual
This instruction manual provides information on installation, adjustment, maintenance, and parts ordering for the
Fisher 667 actuator in sizes 30/30i through 76/76i and size 87. The 667‐4 actuator in sizes 70/70i and 87 is also
covered. Refer to separate instruction manuals for information about the valve positioner and other accessories used
with these actuators.
Do not install, operate, or maintain a 667 actuator (see figure 1) 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
D100310X012
667 Actuator (Size 30/30i - 76/76i and 87)
June 2017

Instruction Manual
D100310X012
667 Actuator (Size 30/30i - 76/76i and 87)
June 2017
2
Table 1. Specifications
SPECIFICATION(1) ACTUATOR SIZE
30/30i 34/34i 40/40i 45/45i 46/46i 50/50i 60/60i 70/70i(1) 76/76i 87(1)
Nominal Effective Area Sq cm 297 445 445 667 1006 677 1006 1419 1006 1419
Sq Inch 46 69 69 105 156 105 156 220 156 220
Yoke Boss Diameter mm 54 54 71 71 71 90 90 90 90 125
Inch 2‐1/8 2‐1/8 2‐13/16 2‐13/16 2‐13/16 3‐9/16 3‐9/16 3‐9/16 3‐9/16 5
Acceptable Valve Stem Diameter mm 9.5 9.5 12.7 12.7 12.7 19.1 19.1 19.1 19.1 25.4
Inch 3/8 3/8 1/2 1/2 1/2 3/4 3/4 3/4 3/4 1
Maximum Allowable Output Thrust(4) N 10230 10230 12010 25131 33582 25131 30246 39142 30246 39142
LB 2300 2300 2700 5650 7550 5650 6800 8800 6800 8800
Maximum Travel(2) mm 19 29 38 51 51 51 51 76(3) 51 76(3)
Inch 0.75 1.125 1.5 2 2 2 2 3(3) 2 3(3)
Maximum Casing Pressure for Actuator
Sizing(4,6)
Bar 3.8 4.8 4.8 4.5 3.8 4.5 3.8 3.4 3.4 3.4
Psig 55 70 70 65 55 65 55 50 50 50
Maximum Excess Diaphragm Pressure(4,5) Bar 3.8 1.4 1.4 0.7 0.7 0.7 0.7 0.7 0.7 0.7
Psig 55 20 20 10 10 10 10 10 10 10
Maximum Diaphragm Casing
Pressure(4,6,7)
Bar 7.6 6.2 6.2 5.2 4.5 5.2 4.5 4.1 4.1 4.1
Psig 110 90 90 75 65 75 65 60 60 60
Approximate Weight Kg 15/17 22/26 23/26 41/44 55/59 43/48 55/60 115/118 86/89 118
Pounds 34/37 48/58 50/56 90/98 121/129 94/105 122/133 254/260 190/196 260
Material
Temperature
Capabilities
Nitrile Elastomers -40 to 82_C (-40 to 180_F)
Silicone Elastomers -54 to 149_C (-65 to 300_F)
1. These values also apply to the 667‐4 actuator construction.
2. Actuator travel may be less than the value listed after connected to the valve.
3. Maximum actuator travel for 667‐4 is 102 mm (4 inches).
4. See also the Specifications portion of the introduction section.
5. Additional pressure may be added when the actuator is at full travel. If the Maximum Excess Diaphragm Pressure is exceeded, damage to the diaphragm or diaphragm casing might result.
See the Maximum Pressure Limitation section.
6. Maximum diaphragm casing pressure must not be exceeded and must not produce a force on the actuator stem greater than the maximum allowable actuator output thrust or the maxi
mum allowable stem load. See the Maximum Pressure Limitation section.
7. This maximum casing pressure is not to be used for normal operating pressure. Its purpose is to allow for typical regulator supply settings and/or relief valve tolerances.
Description
The 667 actuator (figure 1) and the 667‐4 actuator are reverse‐acting, spring‐opposed diaphragm actuators. They
provide automatic operation of control valves. The 667 actuator provides 76 mm (3 inches) maximum actuator travel.
The 667‐4 actuator provides 102 mm (4 inches) maximum actuator travel. Both actuators position the valve plug in
response to varying pneumatic loading pressure on the diaphragm. Figure 2 shows the operation of these actuators.
A 667 or 667‐4 actuator can be furnished with either a top‐mounted or a side‐mounted handwheel assembly. A
top‐mounted handwheel assembly is normally used as an adjustable down travel stop. (A down travel stop limits
actuator travel in the down direction [when the stem is traveling out of the actuator]. Travel in the up direction is when
the stem is traveling into the actuator.) A side‐mounted handwheel assembly is normally used as an auxiliary manual
actuator. The side‐mounted handwheel can also be used as an adjustable up or down travel stop. Casing‐Mounted
adjustable up or down travel stops are also available on this actuator.
Note
If repeated or daily manual operation is expected, the actuator should be equipped with a side‐mounted handwheel rather than a
casing‐mounted travel stop or top‐mounted handwheel. The side‐mounted handwheel is designed for more frequent use as a
manual operator.

Instruction Manual
D100310X012
667 Actuator (Size 30/30i - 76/76i and 87)
June 2017
3
Figure 2. Schematic of Fisher 667 and 667‐4 Actuators
STEM
SEAL
STEM
AIR LIFTS
STEM UP
SPRING PUSHES
STEM DOWN
A6759
Specifications
Refer to table 1 for Specifications of the 667 and 667‐4 actuators. See the actuator nameplate for specific information
for your actuator.
Educational Services
For information on available courses for Fisher 667 diaphragm actuators, as well as a variety of other products,
contact:
Emerson Automation Solutions
Educational Services - Registration
Phone: [phone] or 1-800-338-8158
E-mail: [email protected]
emerson.com/fishervalvetraining
Instructional Videos
Click here or access the following QR code for a video on mounting a DVC6200 Digital Valve
Controller on a 667 actuator.
Click here or access the following QR code for a video on installing a side-mounted handwheel
on a 667 actuator.

Instruction Manual
D100310X012
667 Actuator (Size 30/30i - 76/76i and 87)
June 2017
4
WARNING
To avoid personal injury or damage to equipment that may result in the malfunction of the control valve or loss of control
of the process caused by excessive pressure, do not exceed the Maximum Pressures listed in table 1. Refer to the Maximum
Pressure Limitations section.
Maximum Pressure Limitations
The casing and diaphragm of 667 actuators are pressure operated. This air pressure provides energy to compress the
spring, to stroke the actuator, and to seat the valve. The following explanations describe the maximum pressure limits
for an actuator. Refer to the nameplate or table 1 for maximum values for your actuator.
D Maximum Casing Pressure for Actuator Sizing: This is the maximum pressure that can be applied at less than full
travel of the actuator. If this stroking pressure is exceeded before the upper diaphragm plate contacts the travel
stop, damage to the stem or other parts might result.
D Maximum Excess Diaphragm Pressure: Additional pressure may be added when the actuator is at full travel. If the
Maximum Excess Diaphragm Pressure is exceeded, damage to the diaphragm or diaphragm casing might result.
Because the actuator has traveled its specified travel, and the diaphragm head is physically stopped from movement,
the energy from any additional air pressure is transmitted to the diaphragm and diaphragm casings. The amount of air
pressure that can be added once the actuator has traveled to the stops is limited by the resultant adverse effects that
may occur. Exceeding this limiting factor could result in leakage or casing fatigue due to the deformation of the upper
diaphragm casing.
D Maximum Diaphragm Casing Pressure: If the Maximum Diaphragm Casing Pressure is exceeded, damage to the
diaphragm, diaphragm casing, or actuator might result.
Installation
WARNING
Always wear protective gloves, clothing, and eyewear when performing any installation operations.
Check with your process or safety engineer for any other hazards that may be present from exposure to process media.
If installing into an existing application, also refer to the WARNING at the beginning of the Maintenance section in this
instruction manual.
Key number locations are shown in figures 6, 7, 8, 9, and 10, unless otherwise noted. Also, refer to figure 3 for location
of parts.
CAUTION
To avoid parts damage, do not use an operating pressure that exceeds the Maximum Diaphragm Casing Pressure (table 1)
or produces a force on the actuator stem greater than the Maximum Allowable Output Thrust (table 1) or the Maximum
Allowable Valve Stem Load.

Instruction Manual
D100310X012
667 Actuator (Size 30/30i - 76/76i and 87)
June 2017
5
D Valve/Actuator Assembly: If the actuator and valve are shipped together as a control valve assembly, it has been
adjusted at the factory, and may be installed in the pipeline. After installing the valve in the pipeline, refer to the
Loading Connection procedures.
D Actuator Mounting: If the actuator is shipped separately or the actuator has been removed from the valve, it is
necessary to mount the actuator on the valve before placing the valve in the pipeline. Refer to the following
actuator mounting procedures before placing the valve in service. It is recommended that you perform the Bench
Set Spring Adjustment procedures in this section to confirm that the actuator is adjusted correctly for the valve
travel.
D Positioner: If a positioner is installed, or is to be installed on the actuator, refer to the positioner instruction manual
for installation. During the adjustment procedures, it will be necessary to provide a temporary loading pressure to
the actuator diaphragm.
D Handwheel Cap: If the handwheel cap (key 247, figures 11, 13, or 21) is not in place, install the cap by pushing it on
by hand until it snaps into place.
Mounting the Actuator on the Valve
CAUTION
The 667 actuator spring load pushes the stem down out of the actuator yoke (see figure 2), and it can come in contact with
the valve stem during actuator mounting.
If the valve stem is allowed to remain in the up position (towards the actuator) during actuator mounting, it can interfere
with the actuator stem during mounting. It is possible to damage valve stem threads or bend the valve stem. Be sure the
valve stem is pushed down (into the valve body), away from the actuator while mounting.
It may be necessary to apply a temporary loading pressure to the actuator to move the actuator stem away from the
valve during installation.
If it is not possible to provide a temporary loading pressure, be very careful when lowering the actuator over the valve
stem to prevent damage to valve stem and threads.
WARNING
When moving the actuator stem with loading pressure applied, exercise caution to keep hands and tools out of the
actuator stem travel path. If the loading pressure is accidently disconnected, personal injury and property damage may
result if something is caught between the actuator stem and other control valve parts.
1. Provide a vise or some other method of supporting the valve and the weight of the actuator during assembly. For
direct or reverse acting valves, push the valve stem down away from the actuator while mounting the actuator.
2. Screw the stem locknuts all the way onto the valve stem. With the concave side of the travel indicator disk (key 34)
facing the valve, install the travel indicator disk on the valve stem. (Note: The travel indicator disk is not used with
size 87 actuators.)
3. Lift or hoist the actuator onto the valve bonnet:
a. For size 87 actuators: Slowly lower the actuator down onto the valve while guiding the valve stem into the
opening in the end of the actuator stem (see figure 4). Once the actuator is in place, insert the cap screws and
tighten the hex nuts, securing the actuator to the bonnet.

Instruction Manual
D100310X012
667 Actuator (Size 30/30i - 76/76i and 87)
June 2017
6
b. For all other size actuators:
D Slowly lower the actuator down onto the valve. As the yoke passes over the end of the valve stem, place the yoke
locknut over the valve stem. (Note: On small size actuators, it may be necessary to remove the indicator disk and
re‐install it while lowering the actuator onto the valve because the disk will not go through the actuator yoke
opening).
D Continue to lower the actuator while guiding the valve stem into the opening in the end of the actuator stem until
the actuator is in place (see figure 4).
D Screw the yoke locknut onto the valve bonnet and tighten the locknut.
4. Do not connect the actuator stem to the valve stem at this time. Whenever the actuator is installed on the valve, it
is recommended that you perform the Bench Set Spring Adjustment procedures below, to verify that the actuator is
still adjusted correctly.
Figure 3. Actuator‐Mounting Components for Size 30/30i through 70/70i Actuators
VALVE STEM
YOKE LOCK NUT
YOKE BOSS
DIAMETER
BONNET
TYPICAL VALVE
(REFER TO
VALVE MANUAL)
W6199-1
MATCH
LINE FOR
ACTUATOR
VENT ASSEMBLY
DIAPHRAGM CASINGS
DIAPHRAGM AND STEM
SHOWN IN DOWN POSITION
DIAPHRAGM
PLATE
LOADING AIR
PRESSURE CONNECTION
ACTUATOR SPRING
ACTUATOR STEM
SPRING SEAT
SPRING ADJUSTOR
STEM CONNECTOR
YOKE
TRAVEL INDICATOR DISK
INDICATOR SCALE
X1184 X1185
SIZE 30 THROUGH 76 SIZE 30i THROUGH 76i

Instruction Manual
D100310X012
667 Actuator (Size 30/30i - 76/76i and 87)
June 2017
7
Discussion of Bench Set
The bench set pressure values are used to adjust the initial compression of the actuator spring with the valve‐actuator
assembly “on the bench.” The correct initial compression ensures that the valve‐actuator assembly will function
properly when it is put into service and the proper actuator diaphragm operating pressure is applied.
The bench set values are established with the assumption that there is no packing friction. When attempting to adjust
the spring in the field, it is very difficult to ensure that there is no friction being applied by “loose” packing.
Accurate adjustment to the bench set range can be made during the actuator mounting process by making the
adjustment before the actuator is connected to the valve (see the Spring Verification Procedure).
Figure 4. Bench Set Adjustment
SPRING
ADJUSTER
ACTUATOR STEM
UPPER BENCH
SET LOADING
PRESSURE
LOWER BENCH
SET PRESSURE
MARK
VALVE STEM
RATED VALVE
TRAVEL MEASURE
MARK VALVE
STEM HERE LOWER BENCH SET
LOADING PRESSURE
3
1
NOTES:
THE LOWER PSIG LOADING PRESSURE (MARKED
ON NAMEPLATE) WHERE THE FIRST MOVEMENT OF
ACTUATOR STEM IS DETECTED.
MARK THIS POINT WITH TAPE OR A MARKER.
THE UPPER PSIG LOADING PRESSURE RETRACTS
ACTUATOR STEM.
MEASURE DISTANCE OF TRAVEL. IT SHOULD EQUAL
THE TRAVEL SHOWN ON THE NAMEPLATE.
1
2
3
4
2
4
4
50A8379‐C
B2429‐1
Spring Verification
Ensure that the actuator diaphragm is at the bottom of its travel as shown in figure 4 and not connected to the valve.
(Note: Some spring compression is required to move the diaphragm to the bottom of its travel.)
Also, provide a certified pressure gauge that will accurately read the diaphragm pressure from 0 through 0.3 bar (5
psig) above the upper operating range pressure marked on the nameplate. Apply loading pressure to the diaphragm.
Stroke the actuator a few times to ensure that the pressure gauge is working correctly, and that the actuator is
functioning properly.
CAUTION
To prevent actuator damage, it is important to ensure that the actuator stem is stroking smoothly and not exhibiting
binding or excessive friction between the actuator stem and the bushing (key 7). Binding or excessive friction could be an
indicator of incorrect assembly or damaged parts.

Instruction Manual
D100310X012
667 Actuator (Size 30/30i - 76/76i and 87)
June 2017
8
Key numbers are shown in figures 6, 7, 8, 9, and 10.
Note
For 667 actuators installed on push-down-to-close (direct acting) valves with fail-close action, the valve plug seat is the limit for
downward travel and the actuator is the limit for upward (away from the valve) movement.
For 667 actuators installed on push-down-to-open (reverse acting) valves with fail-open action, the actuator down stop is the limit
for downward movement, and the valve seat is the limit for upward (away from the valve) movement.
Ensure the correct Spring Verification procedure is followed for the type of valve on which the 667 actuator is installed.
For Push Down to Close (Direct Acting) Valves
1. If not already accomplished, push the valve stem down away from the actuator to the closed position.
2. Set the diaphragm loading pressure to 0.3 bar (5 psig) over the upper operating range pressure. The travel stop cap
screw (key 12) should be contacting the upper diaphragm casing.
3. Slowly decrease the pressure towards the upper bench set pressure, as indicated on the nameplate, while checking
for the first linear movement of the actuator stem.
Note
Before turning the spring adjuster on size 70/70i, 76/76i, or 87 actuators, assemble the stem connector around the actuator stem
and the anti‐rotating lug on the yoke. Mark the actuator stem as a visual reference to verify that stem rotation does not occur.
Remove the stem connector before rechecking the bench set.
4. If movement occurs before or after the upper bench set pressure is reached, adjust the spring adjuster (see figure
4). Thread the adjuster up or down on the actuator stem until the actuator stem movement is first detected at the
upper bench set pressure. (Note: You may need to lower the loading pressure to reduce spring compression,
allowing the spring adjuster to turn.)
5. Be sure the spring adjuster is adjusted to meet the requirements of step 4 above.
6. Slowly decrease diaphragm loading pressure to the lower bench set pressure, as indicated on the nameplate. This
will extend the actuator stem toward the valve. Mark the end of the actuator stem on a nearby surface using tape or
some other method.
7. Slowly increase the diaphragm loading pressure until the upper bench set pressure is reached. Again, the travel stop
cap screw (key 12) should be against the upper diaphragm casing.
8. Measure the distance between the mark or tape to the end of the actuator stem. This distance should match the
rated travel indicated on the nameplate.
9. If the measured travel matches the nameplate travel, bench set is complete. Proceed to the Installing the Stem
Connector Assembly subsection.
10. If the measured travel is not exact, consider the spring free‐length and spring rate tolerances may produce a
slightly different bench set than specified. Contact your Emerson Automation Solutions sales office for assistance.
For Push Down to Open (Reverse Acting) Valves
1. If not already accomplished, push the valve stem down away from the actuator to the open position. Later, when
installing the connector, pull up the valve stem to the closed position.

Instruction Manual
D100310X012
667 Actuator (Size 30/30i - 76/76i and 87)
June 2017
9
2. Set the diaphragm loading pressure to a value less than the lower bench set pressure, as indicated on the
nameplate, or near zero. The down travel stops (key 77) should be contacting the yoke.
3. Slowly increase the pressure towards the lower bench set pressure while checking for the first linear movement of
the actuator stem.
Note
Before turning the spring adjuster on size 70/70i, 76/76i, or 87 actuators, assemble the stem connector around the actuator stem
and the anti‐rotating lug on the yoke. Mark the actuator stem as a visual reference to verify that stem rotation does not occur.
Remove the stem connector before rechecking the bench set.
4. If movement occurs before or after the lower pressure is reached, adjust the spring adjuster (see figure 4). Thread
the adjuster up or down on the actuator stem until the actuator stem movement is first detected at the lower bench
set pressure.
5. Apply the upper bench set pressure indicated on the nameplate to the diaphragm. This will retract the actuator
stem away from the valve. Mark the end of the actuator stem on a nearby surface using tape or some other method.
6. Slowly decrease the diaphragm pressure until the lower bench set pressure is applied. Again, the down travel stops
(key 77) should be against the yoke.
7. Measure the distance between the mark or tape to the end of the actuator stem. This distance should match the
rated travel indicated on the nameplate.
8. If the measured travel matches the nameplate travel, bench set is complete. Proceed to the Installing the Stem
Connector Assembly subsection.
9. If the measured travel is not exact, consider the spring free‐length and spring rate tolerances may produce a slightly
different bench set than specified. Contact your Emerson Automation Solutions sales office for assistance.
Installing the Stem Connector Assembly
When installing the stem connector assembly (key 31), the actuator and valve stem threads should engage the
threads of the stem connector by a distance equal to the diameter of the stem.
WARNING
Install the stem connector securely before a positioner is mounted to the actuator and pressurized, using only a
regulator-controlled air supply, not the positioner, to move the actuator stem.
To avoid personal injury or property damage, keep hands and tools out of the actuator stem travel path while applying
loading pressure to move the actuator stem in the following steps.
CAUTION
To avoid damaging the seating surfaces, do not rotate the valve plug while it is seated. Exercise care while installing the
stem connector assembly to avoid damage to the valve plug stem and valve stem threads.
Note
Replacement stem connectors are an assembly of two stem connector halves, cap screws, and a spacer between the connector
halves. Remove the spacer and discard it, if present, before clamping the actuator and valve stems together. Use only a mated pair
of stem connectors.

Instruction Manual
D100310X012
667 Actuator (Size 30/30i - 76/76i and 87)
June 2017
10
1. If necessary, push the valve stem down so that the valve plug is touching the seat ring on direct‐acting valves. For
reverse‐acting valves, pull the stem up to the closed position. Always start with the valve plug on the seat.
2. If necessary, screw the valve stem locknuts down, away from the connector location. For all actuators except size
87, ensure that the travel indicator disk (key 34) is on top of the locknuts.
3. Adjust the diaphragm pressure to the lower bench set pressure (or, the upper bench set pressure for reverse‐acting
valves.) This should be the same pressure used in the Spring Verification steps, and it is marked on the nameplate.
4. Place the stem connector half with the threaded holes approximately half way between the actuator and valve
stems, and align the actuator stem and valve stem with threads from both stems mated root-to-crest with the stem
connector. If the threads from one of the stems do not fully align with the stem connector, a slight change to
loading pressure may be necessary to align the threads. Refer to figures 6, 7, 8, 9, and 10 to help locate the
connector position.
CAUTION
Incomplete engagement of either the valve stem or 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 one
diameter of that stem. Damage to threads on either stem or in the stem connector can cause the parts to be replaced
prematurely. Do not loosen the cap screws when the stem connector has spring or loading pressure force applied.
5. Install the other half of the stem connector and insert the cap screws and tighten them while ensuring even spacing
between the stem connector halves on all sides. If installing a positioner, also attach the feedback bracket at the
same time.
CAUTION
Over‐tightening the valve stem locknuts can make disassembly difficult.
6. Screw the valve stem locknuts up against the stem connector for the size 87 actuator. For all other actuator sizes,
screw the valve stem locknuts up until the indicator disk contacts the bottom of the stem connector. Do not
overtighten the locknuts.
7. Slowly stroke the valve from fully open to fully closed and verify full rated travel is achieved.
Be sure that the valve is in the closed position. Loosen the screws on the travel indicator scale (key 32), and align it with
the travel indicator disk (key 34). Stroke the valve full travel to ensure that the travel matches the rated valve travel on
the nameplate. If valve travel is not correct, repeat the stem connector procedure.
Friction Discussion
If you are attempting to adjust the bench set after the actuator is connected to the valve and the packing tightened,
you must take friction into account. Make the spring adjustment so full actuator travel occurs at the bench set values
(a) plus the friction force divided by the effective diaphragm area with increasing diaphragm pressure or (b) minus the
friction force divided by the effective diaphragm area with decreasing diaphragm pressure.
If the stem connector assembly has been installed, the valve friction may be determined by the following procedure:
1. Install a pressure gauge in the actuator loading pressure line that connects to the actuator diaphragm casing.
Note
Steps 2 and 4 require that you read and record the pressure shown on the pressure gauge.