Emerson Fisher 667NS User manual

www.Fisher.com

Fisher™667NS Diaphragm Actuators

Size 40, 45, 70, and 80

Contents

Introduction 1.................................

Scope of Manual 1.............................

Description 1.................................

Specifications 3...............................

Educational Services 3.........................

Maximum Pressure Limitations 3..................

Installation 4..................................

Actuator Mounting 5..........................

Direct‐Acting

(Push‐Down‐to‐Close) Valves 5............

Reverse‐Acting

(Push‐Down‐to‐Open) Valves 6............

Loading Connection 8..........................

Adjustments 9.................................

Travel 9......................................

Spring 9.....................................

Discussion of Bench Set 9...................

Adjustment Steps 10.......................

Operation 11..................................

Maintenance 11................................

Replacement of the Elastomeric Parts 12..........

Size 40, 45, and 70 Actuators 12.............

Size 80 Actuators 13.......................

Disassembly 14...............................

Size 40, 45, and 70 Actuators 14.............

Size 80 Actuators 14.......................

Assembly 15..................................

Size 40, 45, and 70 Actuators 15.............

Size 80 Actuators 16.......................

Parts Ordering 18...............................

Parts List 18...................................

Introduction

Scope of Manual

This manual provides installation, maintenance, and parts list information for the Fisher 667NS actuator. Refer to

separate instruction manuals for information regarding the control valve and accessories.

Do not install, operate, or maintain 667NS 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 sales office or Local Business Partner before

proceeding.

Description

The 667NS actuator is a reverse‐acting, spring‐opposed diaphragm actuator that is used for operation of automatic

control valves. The 667NS actuator yoke construction and special bonnet‐to‐yoke bolting provides a high structural

resonant frequency that exceeds most nuclear service seismic requirements.

Instruction Manual

D102603X012

667NS Actuator

June 2018

Instruction Manual

D102603X012

667NS Actuator

June 2018

Table 1. Fisher 667NS Specifications

SPECIFICATION ACTUATOR SIZE

40 45 70 80

Nominal Effective Diaphragm Area cm2445 677 1419 see table 5

Inch269 105 220 see table 5

Yoke Boss Diameters mm 71 71 90 5H

Inch 2‐13/16 2‐13/16 3‐9/16 5H

Acceptable Valve Stem Diameters mm 12.7 12.7 19.1 25.4 & 31.8

Inch 1/2 1/2 3/4 1 & 1‐1/4

Maximum Allowable Output Thrust(1) N12,015 30,371 42,720 88,110

Lb 2700 6825 9600 19,800

Maximum Travel mm 38 51 76 76

Inch 1.5 2 3 3

Maximum Diaphragm Pressure to Stroke

Actuator(2,3)

Bar 4.5 4.5 3.5 4.8

Psig 65 65 50 70

Maximum Excess Diaphragm Pressure(2,3) Bar 1.4 0.7 0.7 1.4

Psig 20 10 10 20

Maximum Casing Pressure for Actuator Sizing(3) Bar 4.8 4.5 3.4 4.9

Psig 70 65 50 70

Maximum Diaphragm Casing Pressure(2,3) Bar 6.2 5.2 4.1 5.5

Psig 90 75 60 80

Material Temperature Capabilities(3) -40 to 82_C (-40 to 180_F) with nitrile diaphragm

1. See also the Specifications portion of the Introduction section. Do not exceed maximum allowable valve stem load when applying maximum allowable thrust.

2. 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.

3. The pressure and temperature limitations in this manual, and any applicable code limitation, should not be exceeded.

Table 2. Diaphragm Casing Volumes, cm3(Inch3)

ACTUATOR

SIZE

CLEARANCE

VOLUME, cm3

(INCH3)

TRAVEL, mm (INCH)

11 (0.4375) 16 (0.625) 19 (0.75) 29 (1.125) 38 (1.5) 51 (2) 76 (3)

40 934 (57) 1475 (90) 1704 (104) 1852 (113) 2327 (142) 2786 (170) ‐ ‐ ‐ ‐ ‐ ‐

45 1556 (95) ‐ ‐ ‐ 2786 (170) 2999 (183) 3720 (227) 4424 (270) 5408 (330) ‐ ‐ ‐

70 3490 (213) 5244 (320) 5948 (363) 6424 (392) 7833 (478) 9242 (564) 11,110 (678) 14,879 (908)

80 4818 (294) ‐ ‐ ‐ ‐ ‐ ‐ ‐ ‐ ‐ 10,488 (640) 12,454 (760) 14,863 (907) 19,337 (1180)

Table 3. Actuator Stem Assembly Bolt Torque Values

ACTUATOR SIZE TORQUE

NSm LbfSFt

183

542

135

400

Table 4. Bonnet‐to‐Actuator Bolt Torque Values

ACTUATOR SIZE BONNET‐ACTUATOR STUD BOLT TORQUE

NSm LbfSFt

102

176

292

130

215

Instruction Manual

D102603X012

667NS Actuator

June 2018

Table 5. Size 80 Diaphragm Area

TRAVEL AREA

mm Inch cm2Inch2

0.75

1.125

1.5

2039

1903

1865

1845

316

295

289

286

2.5

1832

1800

1761

284

279

273

Specifications

Tables 1 and 2 provide specifications for the various sizes of 667NS actuators discussed in this instruction manual.

WARNING

To avoid personal injury or property damage, do not exceed pressure and temperature limits specified in table 1.

Educational Services

For information on available courses for the Fisher 667NS diaphragm actuator, as well as a variety of other products,

contact:

Emerson Automation Solutions

Educational Services - Registration

Phone: 1-641-754-3771 or 1-800-338-8158

E-mail: [email protected]

emerson.com/fishervalvetraining

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 lift the diaphragm away from the valve. The following explanations describe the

maximum pressure limits for an actuator. Refer to table 1 for maximum values.

WARNING

To avoid personal injury or property damage, do not exceed pressure and temperature limits specified in table 1.

D Maximum Diaphragm Pressure to Stroke the Actuator: 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.

Instruction Manual

D102603X012

667NS Actuator

June 2018

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. For some actuator sizes, the maximum casing pressure is

the sum of the maximum stroking pressure added to the maximum excess pressure. For other actuator sizes, the

value is lower than the sum of the two pressures.

Installation

The diaphragm actuator is normally shipped mounted on a valve body. Follow the valve body instructions when

installing the control valve in the pipeline.

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.

If the cover (key 84, figure 4) is not in place on the actuator, install it as shown in figure 4.

WARNING

If the control valve and actuator are installed with the actuator in any position other than vertical, the actuator may not

conform with safety‐related qualifications. Nonvertical orientation should be part of existing qualification analysis on file

at the plant site to ensure conformance with safety‐related qualifications.

The control valve assembly may be installed with any orientation; however, the actuator should not be installed in

ways that allow water to collect in the yoke and actuator spring areas.

Note

The 667NS actuator will not mount on a standard valve bonnet; it requires a style NS bonnet having eight bonnet‐to‐yoke stud

bolts.

Instruction Manual

D102603X012

667NS Actuator

June 2018

If the actuator and control valve body are separate, mount the 667NS actuator on the valve body by following the

procedures in the Actuator Mounting section of this manual.

Actuator Mounting

Direct‐Acting (Push‐Down‐to‐Close) Valves

Refer to figure 1.

1. Screw the stem locknuts all the way onto the valve stem. Put the travel indicator disk, not used with the size 80

actuator, on the locknuts. The concave side of the disk should face the valve.

2. Place the actuator on the valve bonnet.

3. Insert the cap screws and tighten the hex nuts (not shown), securing the actuator to the bonnet. Tighten the cap

screws to the torque shown in table 4.

4. Apply loading pressure to the actuator to retract the actuator stem fully (against the travel stop).

5. With the travel indicator scale attached to the actuator yoke, make a temporary mark on the actuator stem in line

with the top mark on the scale (the mark on the end of the scale that is marked “OPEN”). (The distance from the top

mark on the scale to the bottom mark is equal to the travel of the valve.)

Note

Before turning the spring adjuster on size 70 or 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.

6. Refer to the actuator nameplate to determine the bench set pressure range of the actuator. Reduce actuator

loading pressure to the lower end of the bench set range. (For size 80, remove the cap screw (key 91, figure 4) and

remove the adjusting screw cover (key 84, figure 4). Rotate the spring adjustor (key 74, figure 2 for sizes 40 and 45;

key 74, figure 3 for size 70; and key 74, figure 4 for size 80) until the mark you made on the actuator stem is in line

with the bottom mark on the travel indicator scale. (Replace the size 80 adjusting screw cover and cap screw when

you have completed the adjustments.)

7. Increase actuator loading pressure to the upper end of the bench range and check to be sure that the mark on the

actuator stem is in line with the top mark on the travel indicator scale.

If the marks are in line, the actuator is properly bench set.

If the marks are not in line, the spring is not correct for the specified bench set. It is necessary to use a different spring

or a different bench set.

8. Reduce actuator loading pressure until the mark on the actuator stem is in line with the bottom mark on the travel

indicator scale.

CAUTION

Do not clamp just the tip of either the valve stem or the actuator stem in the stem connector. Incomplete engagement of

the valve stem and/or actuator stem in the stem connector might 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.

Instruction Manual

D102603X012

667NS Actuator

June 2018

9. Push the valve stem firmly against its seat, and be sure that it remains firmly against the seat. Clamp the actuator

stem and valve stem between the two stem connector halves.

If necessary, increase actuator loading pressure slightly to allow the valve stem, actuator stem, and stem connector

threads to match.

Insert and tighten the stem connector cap screws.

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.

10. Raise the travel indicator disk (sizes 40 through 70 only) to the stem connector. For all sizes, thread the stem

locknuts against the stem connector.

11. Remove all actuator loading pressure. Move the travel indicator scale so that the indicator disk (or pointer) is in

line with the bottom mark of the travel indicator scale.

12. Check the valve travel to be sure that the valve travels fully with no overtravel.

Reverse‐Acting (Push‐Down‐to‐Open) Valves

Refer to figure 1.

1. Screw the stem locknuts all the way onto the valve stem. Put the travel indicator disk, not used with the size 80

actuator, on the locknuts. The concave side of the disk should face the valve.

2. Place the actuator on the valve bonnet.

3. Insert the cap screws and tighten the hex nuts (not shown), securing the actuator to the bonnet. Tighten the cap

screws to the torque in table 4.

Note

Before turning the spring adjuster on size 70 or 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.

4. (For size 80, remove the cap screw (key 91, figure 4) and remove the adjusting screw cover (key 84, figure 4).

Rotate the spring adjustor (key 74, figure 2 for sizes 40 and 45; key 74, figure 4 for size 70; and key 74, figure 4 for

size 80) to position the actuator stem at its fully extended position.

5. With the travel indicator scale attached to the actuator yoke, make a temporary mark on the actuator stem in line

with the bottom mark on the scale (the mark on the end of the scale that is marked “OPEN”). (The distance from the

bottom mark on the scale to the top mark is equal to the travel of the valve.)

6. Refer to the actuator nameplate to determine the bench set pressure range of the actuator. Apply an actuator

loading pressure to the actuator equal to the lower end of the bench set range and rotate the spring adjustor until

the mark you made on the actuator stem is in line with the bottom mark on the travel indicator scale. (Replace the

size 80 adjusting screw cover and cap screw when you have completed the adjustments.)

Instruction Manual

D102603X012

667NS Actuator

June 2018

Figure 1. Schematic and Stem Connection Details for Fisher 667NS

SPRING

PUSHES

DOWN

AIR

LIFTS

SCHEMATIC

SIZES 40 AND 45

YOKE

TRAVEL

INDICATOR

SPRING

ADJUSTOR

STEM

CONNECTOR

TRAVEL

INDICATOR

DISK

VALVE

STEM

YOKE

TRAVEL

INDICATOR

TRAVEL

INDICATOR

SPRING

ADJUSTOR

TRAVEL

INDICATOR

DISK

STEM

CONNECTOR

VALVE

STEM

VALVE

STEM

SIZE 70

SIZE 80

STEM CONNECTION

DETAILS

TRAVEL

INDICATOR

POINTER

VENT

DIAPHRAGM

CASING

ACTUATOR

VALVE

STUDS

AND NUTS

FISHER

DBQ-NS

VALVE

A3833‐A

55A9191‐H

55A9193‐F

56A1032‐D

A5958/MM1

C0762‐1

STEM

LOCKNUTS

STEM

LOCKNUTS

STEM

LOCKNUTS

Instruction Manual

D102603X012

667NS Actuator

June 2018

7. Increase actuator loading pressure to the upper end of the bench range and check to be sure that the mark on the

actuator stem is in line with the top mark on the travel indicator scale.

If the marks are in line, the actuator is properly bench set.

If the marks are not in line, the spring is not correct for the specified bench set. It is necessary to use a different spring

or a different bench set.

CAUTION

Do not clamp just the tip of either the valve stem or the actuator stem in the stem connector. Incomplete engagement of

the valve stem and/or actuator stem in the stem connector might 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.

8. Pull the valve stem firmly against its seat, and be sure that it remains firmly against the seat. Clamp the actuator

stem and valve stem between the two stem connector halves.

If necessary, decrease actuator loading pressure slightly to allow the valve stem, actuator stem, and stem connector

threads to match.

Insert and tighten the stem connector cap screws.

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.

9. Raise the travel indicator disk to the stem connector (sizes 40 through 70 only). For all sizes, thread the stem

locknuts against the stem connector.

10. Remove all actuator loading pressure. Move the travel indicator scale so that the indicator disk (or pointer) is in line

with the bottom mark of the travel indicator scale.

11. Check the valve travel to be sure that the valve travels fully with no overtravel.

Loading Connection

1. Connect the loading pressure piping to the NPT internal connection in the top of the actuator yoke.

2. For size 70 actuators, remove the 1/4‐inch bushing in the 1/2 NPT internal connection to increase connection size, if

necessary. Use 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 if 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.

Instruction Manual

D102603X012

667NS Actuator

June 2018

Adjustments

Travel

WARNING

When moving the actuator stem with diaphragm loading pressure, use caution to keep hands and tools out of the actuator

stem travel path. Personal injury and/or property damage is possible if something is caught between the actuator stem and

other control valve assembly parts.

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.

When adjusting travel of a direct‐acting (push‐down‐to‐close) valve, apply a low supply pressure to the actuator

diaphragm casing. This moves the valve plug off of the seat, reducing the chance of damaging the valve plug or seat

during adjustments.

1. Back the stem locknuts and indicator disk 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 might result.

2. Tighten the locknuts together, use a wrench on these locknuts, and 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 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

Discussion of Bench Set

The bench set pressure range is used to adjust the initial compression of the actuator spring with the actuator

assembly “on the bench”. The correct initial compression ensures that the valve‐actuator assembly will function

properly when it is put in service and the proper actuator diaphragm operating pressure is applied.

The bench set range is 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 (see the Actuator

Mounting Procedure) by making the adjustment before the actuator is connected to the valve.

If you are attempting to adjust the bench set range after the actuator is connected to the valve and the packing

tightened, you must take friction into account. Make the spring adjustment such that full actuator travel occurs at the

Instruction Manual

D102603X012

667NS Actuator

June 2018

bench set range (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.

For an assembled valve‐actuator assembly, determine valve friction as described below:

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.

2. Increase the actuator diaphragm pressure and read the diaphragm pressure as the actuator reaches its mid‐travel

position.

3. Increase the actuator diaphragm pressure until the actuator is at a travel position greater than its mid‐travel

position.

4. Decrease the actuator diaphragm pressure and read the diaphragm pressure as the actuator reaches its mid‐travel

position.

The difference between the two diaphragm pressure readings is the change in the diaphragm pressure required to

overcome the friction forces in the two directions of travel.

5. Calculate the actual friction force:

Friction

Force,

pounds

=1/2

Difference

in pressure

readings, psig

()XEffective

diaphragm area,

inches2

(

)

Refer to table 1 and 5 for the effective diaphragm area.

When determining valve friction, you can make diaphragm pressure readings at a travel position other than mid‐travel

if you desire. If you take readings at the zero or at the full travel position, take extra care to ensure that the readings are

taken when the travel just begins or just stops at the position selected.

It is difficult to rotate the spring adjustor (key 74, figure 2, 3, or 4) when the full actuator loading pressure is applied to

the actuator. Release the actuator loading pressure before adjusting. Then re‐apply loading pressure to check the

adjustment.

Adjustment Steps

1. Monitor actuator loading pressure carefully when making adjustments. Do not exceed the maximum pressure

specifications of either the loading regulator or the actuator casings (refer to table 1 for maximum diaphragm

casing pressure).

2. 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 pressure range.

Note

Before turning the spring adjuster on size 70 or 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.

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