Emerson 667 User Manual
Instruction Manual
D100311X012
Fisherr 667 Diaphragm Actuators
Size 80 and 100
667 Size 80 and 100 Actuators
May 2011
Contents
Introduction 1.................................
Scope of Manual 1.............................
Description 2.................................
Specifications 2...............................
Maximum Pressure Limitations 3.................
Installation 4...................................
Actuator Mounting 4...........................
Loading Connection 5..........................
Adjustments 5.................................
Size 80 Actuator Spring 6.......................
Travel 5......................................
Spring 6..................................
Size 100 Actuator Spring 6..................
Maintenance 7.................................
Size 80 Actuator Maintenance 8..................
Size 100 Actuator Maintenance 12...............
For Actuators without the
Top‐Loaded Option 15...................
For Actuators with the
Top‐Loaded Option 17...................
Size 80 Side‐Mounted Handwheel 20.............
Size 80 Hydraulic Snubber 21....................
Size 100 Top‐Mounted Handwheel
(Adjustable Down Travel Stop) 21..............
Parts Ordering 22...............................
Parts Kits 23...................................
Parts List 23...................................
Figure 1. Size 80 Fisher 667 Actuator
W1950
Introduction
Scope of Manual
This instruction manual provides information on installation, adjustment, maintenance, and parts ordering for the
Fisher 667 actuator in sizes 80 and 100 (figure 1). Refer to separate instruction manuals for information about other
equipment and accessories used with these actuators.
www.Fisher.com
667 Size 80 and 100 Actuators
May 2011
Instruction Manual
D100311X012
Do not install, operate, or maintain 667 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.
Table 1. Specifications
ACTUATOR SIZE
All Steel
Construction
(1)
7
Nominal Effective Diaphragm Area
Yoke Boss Diameters
Acceptable Valve Stem Diameters
Maximum Allowable Output Thrust
Maximum Travel
Material Temperature Capabilities
Pressure Connections 1/4 NPT internal
Approximate Weights Without Handwheel
1. Heavy actuator‐to‐bonnet bolting.
SPECIFICATION
2
cm
2
inch
mm 127 127 178
inch 5 5H
mm 25.4 or 31.8 31.8 50.8
inch 1 or 1‐1/4 1‐1/4 2
Standard Cast Iron
Construction
N 62942 88075 200170
lb 14150 19800 45000
mm 76 102
inch 3 4
_C -40 to 82
_F -40 to 180
kg 284 544
lb 626 1200
80 100
1761 2902
273 450
Description
The 667 actuator is a reverse‐acting actuator. Reverse‐acting actuators use air action to lift the diaphragm (away from
the valve), and spring action opposes the diaphragm action (see figure 2). The actuator position changes in response
to varying controlled air pressure to the diaphragm. If air pressure is reduced or lost from the actuator diaphragm,
spring action will extend the actuator stem. The actuator is often used with control valves using a pneumatic
positioner for air pressure control, and where fail action will fully open or close the control valve as the actuator stem
extends.
Also, the actuator can be furnished with either a side‐mounted (size 80 only) handwheel assembly or a top‐mounted
handwheel (adjustable up travel stop) (size 100 only). The size 80 side‐mounted handwheel is normally used as an
auxiliary manual actuator. The size 100 top‐mounted handwheel is used as either a travel stop or an auxiliary manual
actuator.
The actuator can be furnished with a top‐loading capability. A top‐loaded actuator allows air pressure to be applied to
the top of the diaphragm, aiding the spring to extend the actuator stem. This air pressure increases valve seat load on
valve applications where additional seat‐loading is necessary.
Specifications
Refer to table 1 for Specifications of the 667 actuator. See the actuator nameplate for information about a specific
actuator.
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Figure 2. Schematic Representation of Fisher 667 Actuator
DIAPHRAGM
AIR
LIFTS
AF3833‐A
A6127
667 REVERSE‐ACTING DIAPHRAGM ACTUATOR
Table 2. Maximum Pressure Limitations
PRESSURE LIMITATIONS
Maximum Casing
Pressure for Actuator
Sizing
Maximum Excess
Diaphragm Pressure
Maximum Diaphragm Casing
Pressure
bar 3.4 4.9 6.9
psig 50 70 100
bar 1.4 1.4 1.7
psig 20 20 25
Standard Cast Iron Construction All Steel Construction
Upper bench set plus Maximum
Excess Diaphragm Pressure or 4.1 bar
(60 psig), whichever is less.
80
SPRING
PUSHES
DOWN
ACTUATOR
STEM
ACTUATOR SIZE
Upper bench set plus Maximum
Excess Diaphragm Pressure or 5.5 bar
(80 psig), whichever is less.
667 Size 80 and 100 Actuators
May 2011
100
Upper bench set plus Maximum
Excess Diaphragm Pressure or 7.9 bar
(115 psig), whichever is less.
Maximum Pressure Limitations
WARNING
To avoid personal injury or parts damage, do not exceed the Maximum Pressures listed in table 2. Exceeding any of the
maximum pressures can result in uncontrolled movement of parts, damage to actuator parts and the control valve, and
loss of control of the process. Use pressure‐limiting or pressure‐relieving devices to prevent casing pressure from
exceeding these limits.
The casing and diaphragm of 667 actuators are pressure operated. This air pressure provides force to compress the
spring and stroke the actuator. The following explanations describe the maximum pressure limits for 667 actuators.
Refer to the nameplate, warning tag, and table 2 for maximum values.
D Maximum Casing Pressure for Actuator Sizing: This is the maximum pressure that can be applied to provide 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. The Maximum Diaphragm Casing Pressure for a specific
actuator construction may be less than the Maximum Casing Pressure for Actuator Sizing. See table 2.
D Maximum Excess Diaphragm Pressure: This is the additional pressure that may be added when the actuator is at full
travel. If the Maximum Excess Diaphragm Pressure is exceeded once the actuator has reached full travel, damage to
the diaphragm or diaphragm casing might result.
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667 Size 80 and 100 Actuators
May 2011
Because the actuator has traveled its specified travel, and the diaphragm head is physically stopped from movement,
the force 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. For some actuator constructions, the maximum
Diaphragm Casing Pressure is the sum of the upper bench set, noted on the nameplate, added to the Maximum
Excess Diaphragm Pressure. For other actuator sizes, the value is lower, see table 2.
Instruction Manual
D100311X012
WARNING
To avoid personal injury or parts damage, do not exceed the Maximum Diaphragm Casing Pressure listed in table 2. 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 are shipped together, the actuator is normally mounted on the valve. Follow the valve
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 following Actuator Mounting procedures.
For information on mounting valve positioners, refer to the appropriate valve positioner instruction manual.
Actuator Mounting
1. Mount the actuator on the valve bonnet. Insert the cap screws and tighten the hex nuts, securing the actuator to
the bonnet.
2. Screw the valve stem jam nuts (key 69, figures 6 and 7) all the way onto the valve stem threads.
3. Connect an air supply to the lower diaphragm casing connection.
4. For push‐down‐to‐close valves, be sure the valve plug is on its seat. Reduce loading pressure to ensure that the
actuator stem is fully extended. Apply slight loading pressure to retract the stem approximately 3.2 mm (1/8‐inch).
5. For push‐down‐to‐open valves, apply pressure to ensure that the actuator stem is fully retracted. Be sure the valve
plug is on its seat. On large valve sizes, this may require the use of a pry bar inserted through the valve body line
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D100311X012
opening. If the valve 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. Reduce actuator loading pressure to extend the stem approximately
3.2 mm (1/8‐inch).
667 Size 80 and 100 Actuators
May 2011
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 the
diameter of that stem.
6. Clamp the actuator and valve plug stems between the two stem connector halves (key 31, figures 6 and 7). Insert
and tighten the stem connector cap screws.
7. Thread the stem locknuts against the stem connector.
8. Align the travel indicator scale (key 32, figures 6 and 7) to show valve position.
WARNING
To avoid personal injury due to the sudden, uncontrolled movement of parts, do not loosen the cap screws when the stem
connector has spring or loading pressure force applied to it.
Loading Connection
Key number locations are shown in figures 6 and 7, unless otherwise directed.
1. Connect the loading pressure piping to the connection in the size 80 spring case adaptor (key 89) or in the size 100
lower diaphragm casing (key 67).
For top‐loaded actuators
1. For size 80, remove the the pipe bushing (key 78), and connect the loading pressure piping in its place. For size 100,
remove the hex bushing (key 62) from the upper casing (key 1), and connect the top loading pressure piping in its
place.
2. Remove the 1/4‐inch bushing (key 92, figure 6; key 62, figure 7) 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 spring 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.
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667 Size 80 and 100 Actuators
May 2011
When adjusting travel of a direct‐acting valve, put 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 jam nuts (key 69, figures 6 and 7) away from the stem connector (key 31, figures 6 and 7), and
slightly loosen the stem connector cap screws.
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D100311X012
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 for the specified 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 Maximum Allowable
Supply pressure 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 Actuator Spring
Note
Before turning the spring adjuster on size 80 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.
Remove the cover band (key 87, figure 6), insert a rod of approximately 12.7 mm (1/2 inch) diameter into a hole in the
spring adjustor (key 74, figure 6), and rotate the spring adjustor with the rod. Rotating the adjustor 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 Actuator Spring
CAUTION
The actuator must be in the vertical position when adjusting the spring to avoid damage to the thrust bearing (key 86,
figure 7) and to properly position the spacers required for adjustment.
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Remove the shroud plate (key 65, figure 7), and loosen the jam nut (key 26, figure 7).
For small spring forces, adjustments can be made by rotating the adjusting nut (key 25, figure 7). Counterclockwise
rotation (when viewed from the diaphragm casings) of the adjusting nut will increase the loading pressure required to
start actuator stem travel, and clockwise 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 bottom of the yoke and the spring seat to isolate
spring force from the adjusting nut.
667 Size 80 and 100 Actuators
May 2011
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.
1. It is recommended that three spacers be made of three‐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 also be of equal length with ends cut squarely.
2. Measure dimension B as shown in figure 3. Cut the length of the 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
19, figure 7). Spacers must be seated squarely, or they may slip out of position. Keeping hands and 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 the bottom of the yoke.
5. Loosen the jam nut. The adjusting nut can now be rotated counterclockwise (when viewed from the diaphragm
casings) to increase the loading pressure required to start actuator stem travel or clockwise 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. Slowly reduce the air pressure to the actuator. Make sure that the thrust bearing (key 86) is correctly seated in the
spring seat before contact with the adjustment nut (key 25) is made.
8. 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:
7
667 Size 80 and 100 Actuators
May 2011
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.
Instruction Manual
D100311X012
Figure 3. Dimension B for Spring Adjustment
SPRING SEAT
B
ADJUSTING NUT
JAM NUT
50A2627‐C
A1007‐1
Size 80 Actuator Maintenance
For size 80 actuators, refer to figure 4 for part names and locations. Key number locations for size 80 actuators are
shown in figure 6.
Disassembly
1. Isolate the control valve from the line pressure, release pressure from both sides of the valve, and drain the process
media from both sides of the valve. Shut off all pressure lines to the power actuator, release all pressure from the
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Instruction Manual
D100311X012
667 Size 80 and 100 Actuators
May 2011
actuator. Use lock‐out procedures to be sure that the above measures stay in effect while you work on the
equipment.
2. Remove the tubing or piping from the connection in the top of the spring case adaptor (key 89).
3. If the actuator has a handwheel, rotate the handwheel to relieve all spring compression.
4. Remove the cover band (key 87). Insert a steel rod of approximately 12.7 mm (1/2‐inch) diameter into a hole in the
spring adjustor (key 74), and rotate the spring adjustor from right to left until spring compression is relieved.
WARNING
To avoid personal injury due to the sudden, uncontrolled movement of parts, do not loosen the cap screws on the stem
connector (key 31) when spring force is applied.
5. If necessary, the entire actuator assembly may be removed from the valve by unscrewing the cap screws from the
stem connector (key 31) and removing actuator‐to‐bonnet bolting.
6. Unscrew the diaphragm casing cap screws and nuts (keys 13 and 14), and lift off the upper diaphragm casing (key
1).
7. Unscrew the diaphragm cap screw (key 12), remove the spacer, upper diaphragm plate, diaphragm, and lower
diaphragm plate (keys 2, 4, 3, and 71).
Note
Standard and top‐loaded constructions use the same key numbers for parts. The parts look different, but they use the same
assembly and disassembly sequence. See figure 4, Size 80 Actuator Construction for location of parts.
8. Unscrew the cap screws (key 30), and remove the lower diaphragm casing (key 64).
9. For actuators without a snubber:
a. Unscrew the spring case adaptor cap screws and nuts (keys 90 and 91), and remove the adaptor (key 89) from
the actuator.
b. Remove the snap ring and seal bushings (keys 72 and 7). Inspect, and if necessary, obtain a replacement seal
bushing (key 7). Replace the seal bushing O‐rings (keys 8 and 9) as required. Lubricate with lithium grease (key
237) lubricant.
c. Remove the actuator spring (key 18). Unscrew the cap screws from the stem connector (key 31), and remove the
stem connector. Remove the stem (key 144) and attached spring adjustor, thrust bearing, and spring seat (keys
74, 86, and 19).
10. For actuators with a snubber (see figure 8):
WARNING
To avoid personal injury due to the sudden, uncontrolled movement of parts, ensure the actuator spring is not under
compression before removing the travel stop.
a. Remove the travel stop (key 84). Be certain there is not compression in the actuator spring (key 18). If the
actuator was removed from the valve, secure the stem connector (key 31) to the actuator stem (key 144) to
prevent the stem from turning while unscrewing the stem and piston assembly (key 23).
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