Fisher 656 User manual

D100304X012

Type 656 Diaphragm Actuators



Fisher Controls Type 656 actuators are long stroke,

spring opposed, direct-acting diaphragm actuators.

They operate Vee-BallRvalves, butterfly valves, built-

in turbine valves, louvers, dampers and similar equip-

ment. They are suitable for either push-down-to-close

(PDTC) or push-down-to-open (PDTO) applications

and are available in sizes 30, 40 and 60 to provide

2-1/8”, 3-1/2” and 4-1/8” travel, respectively.



In a direct acting diaphragm actuator, increasing load-

ing pressure moves the actuator stem downward,

compressing the spring. When the diaphragm pres-

sure is decreased, the spring moves the actuator stem

upward. In the event of failure of the loading pressure

or the operating medium pressure to the controller, the

actuator stem moves to the extreme upward position.



When an actuator and valve are shipped together, the

actuator is normally mounted on the valve. Follow the

valve instructions when installing the valve and actua-

tor in a pipeline. If the actuator is shipped separately,

or if it is necessary to mount the actuator on the valve,

four holes have been tapped into the yoke boss to an-

chor it to a mounting bracket.

WARNING

To avoid personal injury or property

damage caused by bursting of pressure

retaining parts, be certain the dia-

phragm casing pressure does not

Figure 1. Type 656

W0454/ IL

exceed the limits listed in the Specifica-

tions table. Use pressure relieving or

pressure limiting devices to prevent the

diaphragm casing pressure from ex-

ceeding these limits.

To make the stem connection, follow the appropriate

assembly step 10 in the

Maintenance

section. Stan-

dard actuator sizes 30 and 40 have mounting holes

tapped 3/8” UNC, and the size 60 mounting holes are

tapped 1/2” UNC.

Instruction Manual

Form 5504

September 1998 Type 656

Type 656

Table 1. Specifications

Maximum Recommended Casing Operating

Pressure(1)

35 psig (2.4 bar)

Maximum Allowable Casing Pressure(2)

Actuator

Size Maximum Casing

Rating, Psig (Bar)

30 125 (8.6)

40 65 (4.9)

60 40 (2.8)

Maximum Travel

ACTUATOR

MAXIMUM RATED

STEM TRAVEL,

INCHES (mm)

MAXIMUM STEM

RETRACTION

ADJUSTMENT

ACTUATOR

SIZE Standard

Travel

Stop

Optional

Travel

Stop

ADJUSTMENT

WITH OPTIONAL

HANDWHEEL,

INCHES (mm)

30 2-1/8 (54) Not available 3/4 (19)

40 3-1/2 (64) 3 (76) 1-1/2 (38)

60 4-1/8 (105) 3-13/16 (97) 2 (51)

Maximum Operating Temperature

J150°F (66°C) with Nitrile diaphragm material

Casing Connection

1/4-inch NPT female

Actuator Weight

Actuator Size Approximate

Shipping Weight,

Pounds (kg)

30 50 (23)

40 70 (32)

60 160 (73)

Options

Top-mounted handwheel/adjustable travel stop

1. Control and stability may be impaired if this pressure is exceeded.

2. Exceeding this pressure can cause damage to the diaphragm, diaphragm casing, or other parts.

A 1/4” NPT loading pressure connection is located in

the top of the upper diaphragm case. Using either pipe

or tubing, connect either the loading pressure connec-

tion or valve positioner input connection (if a valve po-

sitioner is furnished, the loading pressure connection

to the actuator will be made at the factory) to the out-

put pressure connection on the controller. Keep the

length of the pipe or tubing as short as possible to

avoid transmission lag in the control signal.



When the actuator is completely installed and con-

nected to the controller, it should be checked for cor-

rect travel, freedom from friction and correct PDTC or

PDTO action.

The actuator spring and diaphragm have been se-

lected to meet the requirements of the application. It

should be noted that the actuator spring has a

constant rate of compression and that adjustment of

the spring compression merely shifts the initial spring

setpoint up or down to make the actuator travel within

the initial spring setpoint and the maximum diaphragm

pressure indicated on the nameplate.

In some instances, however, such as high friction but-

terfly and ball valves, the actuator will fully stroke with

less diaphragm pressure than indicated on the name-

plate. To increase the pressure required to initiate ac-

tuator stem movement, turn the lower bearing seat

(key 14) up toward the spring case. To decrease the

pressure at which movement begins, turn the lower

bearing seat down, away from the spring case.



WARNING

Avoid personal injury or property dam-

age from sudden release of process

pressure or uncontrolled movement of

parts. Before performing any mainte-

nance operations:

DDisconnect any operating lines pro-

viding air pressure, electric power, or a

control signal to the actuator. Be sure

the actuator cannot suddenly open or

close the valve.

DUse 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.

Type 656

DVent the power actuator loading

pressure and relieve any actua-

tor spring precompression.

DUse lock–out procedures to be sure

that the above measures stay in effect

while you are working on the equip-

ment.

Disassembly

1. If the actuator is installed on a control valve, isolate

or bypass the control valve.

2. Shut off the diaphragm loading pressure and re-

move the pipe or tubing from the loading pressure

connection in the top of the diaphragm case.

3. Turn the lower bearing seat (key 14) down, away

from the spring case to relieve all spring compression.

4. If the entire actuator is to be removed from its

mounting, disconnect the actuator stem (key 10) from

the stem connector, clevis, etc., and remove the jam

nuts (key 23). Loosen the cap screws that hold the

yoke (key 9) to its mounting plate or bracket, and lift

the entire actuator from its mounting.

5. Remove the diaphragm case cap screws and nuts

(keys 19 and 20) and lift the upper diaphragm case

(key 1 ) off the actuator. Remove the diaphragm (key

2).

6. Lift out the diaphragm plate (key 4) and stem (key

10). They may be separated by removing the cap

screw (key 3).

7. Take out the actuator spring (key 6).

8. The lower diaphragm case (key 5) can be removed

from the yoke, if required, by loosening the travel

stops and cap screws (keys 7 and 8).

9. Remove the lower spring seat (key 11) and thrust

bearing (key 13). Unscrew the lower bearing seat (key

14) from the adjusting screw (key 12).

10. Remove the set screw (key 22) and remove the

adjusting screw to complete disassembly.

Assembly

1. Apply Lubriplate MAG-1 lubricant, or equivalent, to

the adjusting screw threads (key 12) and screw this

into the yoke (key 9). Replace set screw (key 22). The

set screw should engage the machined thread relief in

the adjusting screw.

Figure 2. Travel Stop Orientation for Size 60

11A0001-A/ DOC

MOUNTING BOSS

ON ACTUATOR YOKE

LOCATE FOUR TRAVEL

STOPS MARKED A

MOUNTING BOX

ON ACTUATOR YOKE

2. With the eared portion up, screw the lower bearing

seat (key 14) all the way onto the adjusting screw.

3. Apply Lubriplate MAG-1 lubricant, or equivalent, to

the thrust bearing (key 13) and position it on the lower

bearing seat (key 14). Lay the lower spring seat (key

11) on top of the thrust bearing assembly.

4. Mount the lower diaphragm case (key 5) to the top

of the yoke (key 9) using the travel stops and cap

screws (keys 7 and 8). Alternate screws and travel

stops on the sizes 30 and 40. See figure 2 for the cor-

rect orientation of the size 60.

5. Position the actuator spring (key 6) on the lower

spring seat.

6. Attach the diaphragm plate (key 4) to the actuator

stem (key 10) with the cap screw (key 3). Apply Lubri-

plate MAG-1 lubricant, or equivalent, to the stem.

Place this assembly, actuator stem first, into the yoke

with the actuator stem through the spring adjustor (key

12).

7. Position the diaphragm (key 2) on the diaphragm

plate (key 4) and align the holes with the lower dia-

phragm casing (key 5). Attach the upper diaphragm

case (key 1) to the lower diaphragm casing (key 5)

using the cap screws and nuts (keys 19 and 20).

Note

When you replace actuator diaphragms

in the field, take care to ensure the dia-

phragm casing bolts are tightened to

the proper load to prevent leakage, but

not crush the material.

Note

Do not use lubricant on these bolts and

nuts. Fasteners must be clean and dry.

Type 656

a. The first four bolts tightened should be diametri-

cally opposed and 90 degrees apart. Tighten these

four bolts to 10 lbfSft (13 NSm).

b. Tighten the remaining bolts in a clockwise,

criss-cross pattern to 10 lbfSft (13 NSm).

c. Repeat this procedure by tightening four bolts,

diametrically opposed and 90 degrees apart, to a

torque of 20 lbfSft (27 NSm).

d. Tighten the remaining bolts in a clockwise,

criss-cross pattern to 20 lbfSft (27 NSm).

e. After the last bolt is tightened to 20 lbfSft (27

NSm), all of the bolts should be tightened again to

20 lbfSft (27 NSm) in a circular pattern around the

bolt circle. Once completed, no more tightening is

recommended.

8. If the actuator has been removed from its mount-

ing, position it on its mounting plate or bracket, and

secure with cap screws.

9. Attach the pressure pipe or tubing to the loading

pressure connection on top of the upper diaphragm

case.

10. Attach the actuator stem to the stem connector or

clevis and adjust the travel by using the appropriate

procedure below.

DFor Push-Down-to-Open applications:

1. Set the controlled element (valve plug, louver,

damper, etc.) in the closed position.

2. Turn the lower bearing seat (key 14) up toward the

spring case far enough to ensure that the actuator

stem is at the top of its stroke.

3. Make the actuator stem connection, making sure

that there is full engagement of the actuator stem

threads. Tighten slightly.

4. Apply loading pressure to the diaphragm case to

move the controlled element toward its wide open

position. Screw the controlled element linkage into the

actuator stem connection far enough to move the con-

trolled element toward its closed position 1/8 inch, and

tighten the stem connection securely. This adjustment

ensures that the controlled element will close before

the actuator stem travels to the top of its stroke. The

travel stops (key 7) in the lower diaphragm case en-

sure correct travel of the controlled element in the

open direction.

5. If travel starts at a lower or higher pressure than is

required for proper operation, turn the lower bearing

seat (key 14) up or down respectively, as described in

the

Adjustment

section.

DFor Push-Down-to-Close applications:

1. Set the controlled element (valve plug, louver,

damper, etc.) in the open position.

2. Turn the lower bearing seat (key 14) up toward the

spring case far enough to ensure that the actuator

stem is at the top of its stroke.

3. Tighten the actuator stem connection slightly, mak-

ing sure that there is full engagement of the actuator

stem threads.

4. Apply loading pressure to the diaphragm case and

observe the travel of the controlled element to make

sure that it closes completely. If the travel is not cor-

rect, it can be changed by screwing the controlled ele-

ment linkage in or out of the stem connection. When

the travel is set correctly, tighten the stem connection

securely, and lock the jam nuts (key 23).

5. If travel starts at a lower or higher pressure than is

required for proper operation, turn the lower bearing

seat in or out respectively, as described in the

Adjust-

ment

section.

Parts Ordering

When corresponding with your Fisher Controls sales

office or sales representative about this equipment,

refer to the serial number found on the actuator name-

plate.

Parts List

Key Description Part Number

1 Diaphragm Case, steel

Standard

Size 30 2J173828992

Size 40 2L441828992

Size 60 30A0055X012

For top-mounted handwheel

Size 30 2E792225062

Size 40 2E806325062

Size 60 2E847425062

2* Diaphragm

Size 30 2E791902202

Size 40 2E670002202

Size 60 2E859702022

3 Cap Screw, steel

Size 30 & 40 1E760432992

Size 60 1E775432982

4 Diaphragm Plate, cast iron

Size 30 2F649319042

Size 40 2V939919042

Size 60 20A1336X012

5 Lower Diaphragm Case, steel

Size 30 2E792225062

Size 40 2E806325062

Size 60 2E847425062

6 Actuator Spring, steel See following table

*Recommended spare parts

Type 656

Figure 3. Type 656 Size 30

APPLY LOCTITE 277 TO SURFACE A

CK1580

A0345-1/ IL

Figure 4. Type 656 Sizes 40 & 60

40A7798A/ DOC

APPLY LUBRIPLATE MAG-1 ON SURFACES A & B

Key Description Part Number

7 Down Travel Stop, steel

Size 30 (3 req’d) 1F847524092

Size 40 (3 req’d) 1F842824092

Size 60 (4 req’d) 1E797924092

8 Cap Screw, steel

Sizes 30 & 40 (3 req’d), 60 (4 req’d) 1A368424052

Key 6 Actuator Spring, steel

Actuator

Size Spring

Rate, lbSin Spring Color Code Part Number

80 Aluminum & Lt. Blue

Aluminum & Purple 1H826227032

1H826127032

125

170 Aluminum & Orange

Aluminum & Dark Green 1F361627032

1K509827032

30 238

275 Aluminum & Red

Tan 1N751527032

1F177027092

370

460 Brown

Pink 1F177127092

1F177227092

145

205 White

Yellow 1L217427042

1P637127082

40 335

455 Dark Green

None(1) 1L217327042

1N844027082

280

400 None(1)

None(1) 1K162727082

1N937327082

60 610

860 None(1)

None(1) 1K162827082

1P270227042

1. These springs have part number stamped on the side of the tapered ends.

Key Description Part Number

9 Yoke, cast iron

Size 30 2F998619042

Size 40 3L440419042

Size 60 4L919119042

10 Actuator Stem, steel

Size 30 1F999424102

Size 40 1L450224102

Size 60 2L919224102

11 Lower Spring Seat, steel

Size 30 15A9864X012

Size 40 15A9865X012

Size 60 1L919324272

12 Adjusting Screw, brass

Size 30 1J992414102

Size 40 1L450114102

Size 60 1L919414102

13 Thrust Bearing, steel ball bearing

Size 30 & 40 15A0384X012

Size 60 1L919528992

14 Lower Bearing Seat, steel

Size 30 & 40 15A9866X012

Size 60 1L919624272

17 Nameplate, SST 12B6508X0A2

18 Drive Screw, SST (6 req’d) 1A368228982

19 Cap Screw, steel

Size 30 (12 req’d) & 40 (16 req’d) 1E760324052

Size 60 (24 req’d) 1A675124052

20 Hex Nut, steel

Size 30 (12 req’d) & 40 (16 req’d) 1A346524122

Size 60 (24 req’d) 1A346524122

21 Valve Stem, 316 SST (Size 30 only) 1J992535162

22 Set Screw, steel 1H199928992

23 Hex Nut, steel (2 req’d)

Size 30 1A353724122

Size 40 & 60 1A351124122

25 Warning Nameplate 14B6769X0A2

Handwheel Assembly

51 Handwheel, cast iron

Size 30 1F143819042

Size 40 1F118119042

Size 60 1A353724122

54 Jam Nut, steel 1A353724122

Type 656

Figure 5. Typical Top-Mounted Handwheel Assembly for Diaphragm Actuator

LUBRICATE END OF STEM AND PLATE WITH LUBRIPLATE MAG-1

LUBRICATE STEM THDS WITH NEVER SEEZ NICKEL SPECIAL

CV8011-E / DOC

Key Description Part Number

133 Stem, brass

Size 30 1K949514042

Size 40 1N168914042

Size 60 12A4035X012

134 Washer, steel 1A518925072

135 Pusher Plate Assembly, steel

Size 30 & 40 1F117999012

Size 60 1F118399012

137 Jam Nut, steel

Size 30 & 40 1A351124122

Size 60 1F119724122

138* O-ring, nitrile

Size 30 & 40 1D237506992

Size 60 1B885506992

139* O-ring, nitrile

Size 30 & 40 1D267306992

Size 60 1D547106992

Key Description Part Number

140 Groove Pin, steel

Size 30 & 40 1F118028992

Size 60 1B627035072

141 Cap Screw, steel

Size 30 & 40 (6 req’d), 60 (8 req’d) 1A368424052

142 Handwheel body, cast iron

Size 30 2K949619012

Size 40 1N168719012

Size 60 2K949419012

164 Body Extension, steel

Size 40 17A9658X012

Size 60 17A9657X012

165 Groove Pin, steel

Size 40 1A953228982

Size 60 1F118028992

171 Spacer, 416 SST (size 60 only) 10A0057X012

*Recommended spare parts

For information, contact Fisher Controls:

Marshalltown, Iowa 50158 USA

Cernay 68700 France

Sao Paulo 05424 Brazil

Singapore 128461



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Printed in U.S.A.

Vee-Ball, Fisher, Fisher-Rosemount, and Managing The Process Better are marks owned by Fisher Controls International, Inc. or Fisher-Rosemount Systems, Inc.

All other marks are the property of their respective owners.

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