Fisher Fisher 657NS2 Diaphragm Actuators Size 45, 70, and 80 Manuals & Guides

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Instruction Manual

D103474X012

Fisher™ 657NS2 Diaphragm Actuators Size 45, 70, and 80

Contents

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

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

Description 2.................................

Specifications 2...............................

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

Principle of Operation 3.........................

Lifting Guidelines 3.............................

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

Mounting the Actuator on the Valve 5............

Loading Connection 5..........................

Adjustments 6.................................

Travel Adjustment 6...........................

Bench Set 7..................................

Discussion of Bench Set 7...................

Bench Set Adjustments 8...................

Installing the Stem Connector Assembly 9.........

Deadband Measurement 10.....................

Deadband Adjustments 10..................

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

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

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

Size 45 and 70 Actuators 12.................

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

Disassembly 13...............................

Size 45 and 70 Actuators 13.................

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

Assembly 14..................................

Size 45 and 70 Actuators 14.................

Figure 1. Fisher 657NS2 Actuator with HPNS Valve

Size 80 Actuators 15.......................

657NS2 Troubleshooting 20.....................

Parts Ordering 17...............................

Parts List 17...................................

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Introduction

Scope of Manual

This manual provides installation, adjustment, maintenance, and parts list information for the Fisher 657NS2 actuator (figure 1). Refer to separate instruction manuals for information regarding the control valve and accessories.

Do not install, operate, or maintain 657NS2 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 proceeding.

www.Fisher.com

before

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Table 1. Fisher 657NS2 Specifications

SPECIFICATION

Nominal Effective Area

Yoke Boss

Acceptable Valve Stem Diameters

Maximum Allowable Output Thrust

Maximum Travel

Maximum Casing Pressure for Actuator Sizing

Maximum Diaphragm Casing Pressure

Material Temperature Capabilities

1. Do not exceed maximum allowable valve stem load when applying maximum allowable thrust.

2. Maximum allowable diaphragm casing pressure may be used only when maximum allowable stem forces are not exceeded.

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

4. EPDM may be used up to 121_C (250_F), but with reduced life. Contact the factory for more information.

5. Actuator travel may be less than maximum when connected to a valve with a shorter travel. See the actuator nameplate for the actuator travel.

(1)

(5)

(3)

(2, 3)

(3, 4)

Inch

mm 12.7 19.1 25.4 Inch 1/2 3/4 1

N 23,352 42,720 88,110

Lb 5250 9600 19,800 mm 51 76 76 Inch 2 3 3

Bar 3.4 3.8 4.9

Psig 50 55 70

Bar 4.1 4.5 5.5

Psig 60 65 80

45 70 80

677 1419 2065 105 220 320

-40 to 82_C (-40 to 180_F) with EPDM diaphragm

ACTUATOR SIZE

Sizes A, B, and C

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NS2

Table 2. Diaphragm Casing Volumes, cm3 (Inch3)

ACTUATOR

SIZE

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) 11110 (678) 14879 (908)

80 9833 (600) ‐ ‐ ‐ ‐ ‐ ‐ ‐ ‐ ‐ 15568 (950) 17698 (1080) 20320 (1240) 25236 (1540)

CLEARANCE

VOLUME, cm

(INCH3)

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

Table 3. Actuator Stem Assembly Bolt Torque Values

ACTUATOR SIZE

70 80 (key 132A) 80 (key 132B)

NSm LbfSFt

271 271 650 407

TORQUE

200 200 480 300

TRAVEL, mm (INCH)

Table 4. Actuator Mounting Bolt Torque Values

ACTUATOR SIZE

45 70 80

ACTUATOR MOUNTING STUD BOLT TORQUE

NSm LbfSFt

292 292 292

215 215 215

Description

The 657NS2 actuator is a direct‐acting, spring‐opposed diaphragm actuator used for operation of automatic control valves. The 657NS2 actuator yoke construction and special yoke-to-body or yoke‐to‐bonnet bolting provides a high structural resonant frequency that exceeds most nuclear service seismic requirements.

Specifications

Tables 1 through 4 provide specifications for the various sizes of 657NS2 actuators discussed in this instruction manual. All torque values given are $5%, unless otherwise specified. Specific actuator information is found on the actuator yoke nameplate.

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Maximum Pressure Limitations

The casing and diaphragm of 657NS2 actuators are pressure operated. This air pressure provides energy to compress the spring, to stroke the actuator, and push the diaphragm to close 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 parts damage, do not exceed the Maximum Pressures listed in table 1. 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.

D Maximum Diaphragm 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.

Principle of Operation

The 657NS2 actuator positions the valve plug in response to varying pneumatic loading pressure on the actuator diaphragm. Figure 2 shows the operation of these actuators. The actuator stem moves down as the loading pressure is increased on the top of the diaphragm. As the loading pressure is decreased, the spring forces the actuator stem up.

The spring and diaphragm have been selected to meet the requirement of the application, and in service, the actuator should produce full travel of the valve with the diaphragm pressure as indicated on the nameplate.

Lifting Guidelines

CAUTION

Loads must be applied only in the plane of the eye. If the plane of the eyebolt is not aligned with the load, estimate the amount of unthreading necessary to properly align the eye. Remove the eyebolt and add shims to adjust the angle of the plane of the eye. The load should never be applied at more than a 45 degree angle from the bolt centerline. Refer to eyebolt manufacturer's instruction manual for further details.

The quantity of eyebolts for lifting purpose is the minimum recommendation. More eyebolts can be used per customer experience.

WARNING

Always read, understand, and follow instructions. Failure to do so can result in severe injury or death. Never stand, work or crawl under the load. The load could swing, pieces could drop, or the load could fall or slip. Allow for this possibility by establishing a safe distance between yourself and the load.

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Lifting Valve/Actuator Assembly

To lift the valve/actuator assembly, eyebolts should be used. Insert four 3/8 inch shouldered pattern eyebolts positioned 90 degrees apart on the diaphragm casing flange for size 45 and 70. Use six 7/16 inch shouldered pattern eyebolts positioned 60 degrees apart on the diaphragm casing flange for size 80. Two nuts are required with one on each side of the diaphragm casing flange. A longer strap is recommended, so that the angle between the straps connecting each eyebolt can be smaller, which helps the eyebolts hold more weight. The eyebolt should be ASTM A489-K04800 or stronger material. Use protective pads between the strap and casing to help prevent damage to the painted surface. A single hoist lift point on the strap will balance and lift the valve/actuator assembly in a level manner. If necessary, use an additional sling around the valve inlet and outlet or around actuator legs for body stabilization.

Lifting Valve Only

To lift the valve, eyebolts should be used. Insert 3/4-10 shouldered pattern eyebolts into two threaded holes located on the top of the NPS 1-4, and NPS 6 valve bodies, positioned 180 degrees apart. For NPS 8 valve bodies, insert two 3/4-10 shouldered pattern eyebolts into two threaded holes located on the top of the bonnet, positioned 180 degrees apart. The eyebolt material should be ASTM A489-K04800 or stronger material. Be sure at least 90% of the threads are engaged in the receiving hole, with a minimum thread engagement of at least 1-1/2 times the thread diameter in steel. If necessary, place two nylon slings around the inlet and outlet of the valve body for stabilization. Use padding as needed to protect any painted surfaces. The valve can now be lifted using a hoist capable of leveling the lifting points.

Lifting Actuator Only

To lift the actuator and accessories, eyebolts should be used. Insert two 3/8 inch shouldered pattern eyebolts positioned 180 degrees apart on the diaphragm casing flange for size 45 and 70. Use four 7/16 inch shouldered pattern eyebolts positioned 90 degrees apart on the spring casing for size 80. Two nuts are required with one on each side of the diaphragm casing flange. The eyebolt material should be ASTM A489-K04800 or stronger material. Use protective pads between the strap and casing to help prevent damage to the painted surface. A single hoist lift point on the strap will balance and lift the actuator in a level manner.

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. For information on mounting valve accessories, refer to the appropriate valve accessories instruction manual.

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.

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. Certain nonvertical orientations can cause water to collect in the yoke and actuator spring areas, eventually causing degradation in product performance.

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Note

The 657NS2 actuator is intended to mount to Fisher HPNS valves. Actuators mount to the valve body on NPS 1 through NPS 6 valves. The actuator mounts to the bonnet on NPS 8 valves.

If the actuator and control valve body are separate, mount the 657NS2 actuator on the valve body by following the procedures in the Mounting the Actuator on the Valve section of this manual.

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Mounting the Actuator on the Valve

CAUTION

If the valve stem is allowed to remain in the up position (towards the actuator) during mounting, it can interfere with the actuator mounting, possibly 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.

The 657NS2 actuator spring loading pushes the actuator stem up towards the actuator diaphragm. This spring action moves the stem away from the valve while installing the actuator.

Refer to figures 2, 4, and 5.

1. Provide a vise or some other method of supporting the valve and the weight of the actuator during assembly. Push the valve stem down away from the actuator while mounting the actuator.

2. Thread the stem locknuts (key 115) all the way onto the valve stem (key 4).

3. Coat the threads of the actuator mounting studs (key 101) with Nuclear Grade Never-Seezr (key 27) up to the deformed thread. Thread the actuator mounting studs (key 101) into the valve body (key 1) until the deformed thread prevents further insertion.

4. Place the actuator on top of the valve with the Fisher logo on the same side as the Fisher logo on the bonnet. If the assembly has a Type III drawing, mount the actuator as shown on that drawing.

5. Coat the remaining threads of the actuator mounting studs (key 101) and the contact faces of the nuts (key 102) with Nuclear Grade Never-Seez (key 27). Place the washers (key 143) over the studs (key 101) and thread the nuts (key 102) onto the studs (key 101) and hand tighten. Torque the actuator mounting nuts (key 102) evenly in a criss-cross pattern to 292 N•m (215 lbf•ft).

6. 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 Adjustment procedures below, to verify that the actuator is still adjusted correctly.

Loading Connection

1. Connect the loading pressure piping to the NPT internal connection in the top of the upper diaphragm casing.

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

3. Keep the length of tubing or piping as short as possible to avoid transmission lag in the control signal. If a volume booster, valve positioner or other accessory is used, be sure that it is properly connected to the actuator. Refer to the accessory 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 Adjustment procedure in the Adjustments section.

6. If the pressure range is incorrect, refer to the Bench Set procedure in the Adjustments section.

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Figure 2. Schematic and Stem Connection Details for Fisher 657NS2

AIR PUSHES DOWN

TRAVEL INDICATOR POINTER

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SPRING PUSHES UP

NPT AIR CONNECTION

DIAPHRAGM CASING

ACTUATOR VALVE STUDS AND NUTS A

GE51676-A

YOKE

TRAVEL INDICATOR POINTER

HPNS VALVE

TRAVEL INDICATOR

STEM LOCKNUTS

STEM

CONNECTOR

YOKE

VALVE STEM

VIEW A-A

Adjustments

Travel Adjustment

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 Mounting the Actuator on the Valve procedure was followed correctly, this adjustment should not be necessary.

1. Back the stem locknuts away from the stem connector, and slightly loosen the stem connector cap screws.

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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 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. Thread the stem locknuts against the stem connector.

Bench Set

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 Mounting the Actuator on the Valve procedure) by making the adjustment before the actuator is connected to the valve.

If you are adjusting to 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 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 supply 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. Record 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. Record 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

Refer to table 1 for the effective diaphragm area.

=1/2

Difference in pressure

(

readings, psig

)

Effective diaphragm area,

(

inches

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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, ensure that the readings are taken when the travel just begins or just stops at the position selected.

The spring adjusting screw is difficult to rotate when the full actuator loading pressure is applied to the actuator. Release the loading pressure before adjusting, then re‐apply loading pressure to check the adjustment.

Bench Set Adjustments

Ensure that the actuator stem is at the top of its travel and not connected to the valve.

Note

Some spring compression may be required to ensure that the actuator stem is at the top of its travel and not connected to the valve.

WARNING

Also, provide a certified pressure gauge that will accurately read the diaphragm pressure from 0 through the upper bench set pressure marked on the nameplate. Apply loading pressure to the diaphragm.

CAUTION

Stroke the actuator a few times to ensure that the pressure gauge is working correctly, and that the actuator is functioning properly. To prevent product damage, it is important to be sure that the actuator assembly is not binding or producing any loading friction on the actuator stem movement.

Key numbers are shown in figures 4 and 5.

1. If not already accomplished, push the valve stem down away from the actuator to the closed position.

2. Connect an unpressurized, regulated air hose to the port on the top of the upper diaphragm casing.

3. Slowly increase the pressure on the top of the diaphragm (key 105) from 0 bar (0 psig) towards the lower bench set pressure while checking for the first movement of the actuator stem (key 125). The actuator stem (key 125) should show movement at the lower bench set pressure.

Note

Before turning the spring adjusting screw, assemble the stem connector around the actuator stem and put the long piece of the stem connector into the anti-rotating slot 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 bench set pressure is reached, adjust the spring adjusting screw (key

127). Turn it clockwise to increase the preload in the spring (key 110) or turn it counterclockwise to decrease the preload in the spring until the first movement of the actuator stem (key 125) is first detected at the lower bench set pressure.

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5. Slowly increase the pressure on the top of the diaphragm (key 105) until the upper bench set pressure is reached.

6. Mark a line on the actuator stem (key 125) and another on the leg of the actuator yoke or yoke/casing assembly (key 109), making sure the lines are level.

7. Slowly decrease the pressure on the top of the diaphragm (key 105) until the lower bench set pressure is reached.

8. Measure the distance between the two lines. This distance should be equal to the rated valve travel.

9. If the distance is correct, bench set is complete. Proceed to the Installing the Stem Connector Assembly subsection.

10. If this distance differs from the rated valve travel, verify that the correct spring and actuator stem are being used and verify that the upper bench set pressure is correct. Remember the freelength and load rate tolerances for the spring may produce a slightly different span than specified. Contact your Emerson Process Management sales office for assistance. After replacing the spring, repeat the steps above.

11. Bleed the pressure from the top of the diaphragm (key 105), and remove the air hose from the port in the upper diaphragm casing.

Installing the Stem Connector Assembly

When installing the stem connector assembly (key 103), the actuator and valve stem threads should engage the threads of the stem connector by a distance equal to the diameter of the stem.

1. If necessary, push the valve stem down so that the valve plug is touching the seat ring on directacting valves.

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.

2. If necessary, screw the valve stem locknuts down, away from the connector location.

3. Slowly increase the diaphragm pressure to the upper bench set pressure. This should be the same pressure used in the bench set steps, and it is marked on the nameplate.

4. Place the stem connector half (key 103B) with the threaded holes, approximately halfway between the actuator and valve stems. Refer to figures 4 and 5 to help locate the connector position.

WARNING

Incomplete engagement of either the valve stem or actuator stem in the stem connector can result in stripped threads, loss of process control, and/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.

5. Attach the other stem connector half (key 103A) with the antirotator in the groove on the yoke and insert the hex cap screws (key 103C) and tighten them. If the actuator is to be used with a positioner, the positioner feedback bracket will be held in place on the stem connector bolt half (key 103A) by the hex cap screws (key 103C). Secure the stem connector assembly with the hex cap screws (key 103C). Torque the cap screws (key 103C) to the value in table 5.

Table 5. Stem Connector Torque Specifications

Actuator Size

45 41 30

70 41 30

80 102 75

N•m lbf•ft

Stem Connector Torque

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6. Release pressure from the actuator casing. Screw the valve stem locknuts (key 115) up until the upper one contacts the bottom of the stem connector assembly (key 103). Do not overtighten the locknuts.

7. Apply Loctite 242 (key 185) to hex cap screws (key 147). Attach the proximity switch target mounting bracket (key

148) to the stem connector half (key 103B) using the hex cap screws (key 147) and washers (key 146) (for size 80 only). Center the bracket vertically on the stem connector and tighten the hex cap screws, torque to 23 N•m (17 lbf•ft) for size 80, or torque to 91 N•m (67 lbf•ft) for size 45 and 70. Adjust the travel scale vertically to align the open mark on the scale with the pointer on the bracket and tighten the mounting screws.

8. Apply pressure to the actuator to ensure the valve strokes to full travel. If not, repeat the stem connector procedure.

9. Release pressure from the actuator. Be sure that the valve stem (key 4) fully retracts to the open position.

Note

For pushdowntoclose valves, the valve plug seat is the limit for downward travel and the actuator upstop is the limit for upward (away from the valve) movement.

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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.

Deadband Measurement

Deadband is caused by packing friction, unbalanced forces, and other factors in the control valve assembly. Deadband is the range a measured signal can vary without initiating a response from the actuator (see figure 3). Each actuator spring has a fixed spring rate (force). You have verified that the correct spring was installed in the actuator by completing the Bench Set Adjustment steps.

Deadband is one factor that affects the control valve assembly operation during automatic loop control. The control loop tolerance for deadband varies widely depending on the loop response. Some common symptoms of the

deadband being too wide are no movement, a “jump” movement, or oscillating movements of the actuator during

automatic loop control. The following steps are provided to determine the span of deadband. The percent of deadband is helpful in troubleshooting problems with the process control loop.

1. Start at a pressure near the lower bench set pressure, slowly increase pressure until the valve is approximately at midtravel. Note this pressure reading.

2. Slowly decrease pressure until movement of the valve stem is detected, and note this pressure.

3. The difference between these two pressures is deadband, in psi.

4. Calculate the percent of deadband by:

Deadband = Deadband, psi Bench Set Span, psi

= nn %

Deadband Adjustments

1. Monitor 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 loading pressure range.

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3. For sizes 45 and 70, turn the spring adjusting screw (key 127, figure 4) into the yoke to shift the span up or turn the spring adjustor out of the yoke to shift the span down. For size 80, remove the spring adjusting screw cover (key 138, figure 5) by removing the cap screws (key 139, figure 5) and washer (key 189, figure 5). Then rotate the spring adjusting screw (key 127, figure 5) to shift the span.

For successful operation, the actuator stem and valve plug stem must move freely in response to the loading pressure change on the diaphragm.

Figure 3. Typical Valve Response to Deadband

CLOSING

UPPER BENCH SET PRESSURE

VALVE

1.0

0.6

DIAPHRAGM PRESSURE, BAR

0.2

LOWER

DIAPHRAGM PRESSURE, PSIG

BENCH SET PRESSURE

A6588‐1

NOTE:

DEADBAND IS CAUSED BY FRICTION.

RANGE OF DEADBAND

OPEN

MID RANGE

DIRECT ACTING VALVE

OPENING VALVE

CLOSED

Operation

In a direct‐acting diaphragm actuator, an increasing loading pressure causes the actuator stem to move downward, compressing the spring. When the diaphragm pressure is decreased, the spring moves the actuator stem upward. This is shown graphically in figure 2. In the event of failure of the loading pressure to the diaphragm of the actuator, the actuator stem moves to the extreme upward position. Thus, the control valve will open on failure of the loading pressure.

The nameplate attached to the yoke of the actuator provides information about the specific construction and operating range. The spring and diaphragm have been selected to meet the requirements of the application, and in service, the actuator should create full travel of the valve plug when the diaphragm pressure (operate) range indicated on the nameplate is applied.

The nameplate specifies a bench set pressure range in addition to a diaphragm pressure (operate) range. The bench set range is that pressure range required to stroke the valve fully without any pressure in the body and no packing friction, as would be the case if the valve were set on the work bench. However, in service, with the specified pressure drop applied across the valve, it should stroke over the diaphragm pressure (operate) range indicated on the nameplate.

When the control valve and actuator are installed, the actuator should be checked for correct travel, freedom from excessive friction, and correct action (air‐to‐close) to match the controlling instrument. For successful operation, the actuator stem and the valve plug stem must move freely in response to the loading pressure change on the diaphragm.

Maintenance

Normally, only the elastomeric parts and the spring of the 657NS2 actuator require inspection or replacement. The maintenance instructions are divided into three subsections: Replacement of the Elastomeric Parts, Disassembly, and Assembly. Perform only those steps applicable to the actuator size and required maintenance.

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All maintenance operations can be performed with the valve in the line.

It is recommended that the diaphragm and all of the other elastomeric parts of the 657NS2 actuator be inspected every two outages. The absolute maximum replacement period for any of the elastomeric parts is six years.

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.

D Check with your process or safety engineer for any additional measures that must be taken to protect against process

media.

Replacement of the Elastomeric Parts

Size 45 and 70 Actuators

Perform the following if it is desired to replace only the elastomeric parts of the 657NS2 actuator, and no other maintenance is necessary. The diaphragm is the only elastomeric part in the size 45 and 70 actuators. Key number references are shown in figure 4 for size 45 and 70 actuators.

1. Isolate the control valve from the line pressure, release pressure from both sides of the valve body, and drain the process media from both sides of the valve. Reduce the actuator loading pressure to atmospheric pressure, and remove the tubing or piping from the top of the upper diaphragm casing (key 104).

2. Remove the cap screw (key 194). Thread the adjusting screw (key 127) out of the yoke (key 109) until all spring compression is relieved. To aid in assembly, record the position of the adjusting screw (key 127) on the actuator stem (key 125).

3. Remove the diaphragm casing cap screws, nuts, and washers (keys 119, 120, and 145), and lift off the upper diaphragm casing.

4. Take out the diaphragm (key 105), and install a new one.

Note

When you replace actuator diaphragms in the field, take care to ensure the diaphragm casing cap screws 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 45 and 70 actuators.

CAUTION

Overtightening the diaphragm casing cap screws and nuts (keys 119 and 120) can damage the diaphragm. Do not exceed a torque of 27 NSm (20 lbfSft) when performing this tightening procedure.

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Note

Do not use lubricant on these cap screws and nuts. Fasteners must be clean and dry.

5. Place the upper diaphragm casing (key 104) into position, and replace the diaphragm casing cap screws, washers, and nuts (keys 119, 145, and 120). Tighten the hex nuts (key 120) in the following manner. The first four hex nuts tightened should be diametrically opposed and 90 degrees apart. Tighten these four hex nuts to 13 NSm (10 lbfSft).

6. Tighten the remaining hex nuts in a clockwise, crisscross pattern to 13 NSm (10 lbfSft).

7. Repeat this procedure by tightening four hex nuts, diametrically opposed and 90 degrees apart, to a torque of 27 NSm (20 lbfSft).

8. Tighten the remaining hex nuts in a clockwise, crisscross pattern to 27 NSm (20 lbfSft).

9. After the last bolt is tightened to 27 NSm (20 lbfSft), all of the bolts should be tightened again to 27 NSm (20 lbfSft) in a circular pattern around the bolt circle.

10. Once completed, no more tightening is recommended.

11. Apply NyoGel 718B (key 149) onto the slot of the actuator stem (key 125). Thread the spring adjusting screw (key

127) into the yoke (key 109) so that it matches the position recorded during disassembly. Apply Loctite 242 (key

185) to cap screws (key 194). Thread it into the hole on the hex head of the spring adjusting screw. If necessary, keep rotating the spring adjusting screw into the yoke for less than ½ turn, making sure the cap screw engages with the slot in the actuator stem. Torque the cap screw to 23 NSm (17 lbfSft).

12. Replace the tubing or piping to the top of the upper diaphragm casing.

657NS2 Actuator

March 2016

Size 80 Actuators

The elastomeric parts in a size 80 actuator include the diaphragm and O‐rings. Since replacement of these parts necessitates complete disassembly, perform the steps outlined in Size 80 Actuators, disassembly and assembly procedures.

Disassembly

Size 45 and 70 Actuators

Key number references are shown in figure 4 for size 45 and 70 actuators.

2. To aid in assembly, record the position of the spring adjusting screw (key 127) relative to the actuator yoke (key

109). Remove the cap screw (key 194). Thread the spring adjusting screw out of the yoke until all spring compression is relieved.

3. If necessary, remove the actuator from the valve body by separating the stem connector (key 103) and removing the eight stud bolt nuts and washers (keys 102 and 143). Separate the stem connector by loosening the stem hex nuts (key 115) and unscrewing the two cap screws.

4. Remove the diaphragm casing cap screws, nuts, and washers (keys 119, 120, and 145), and lift off the upper diaphragm casing (key 104).

5. Take out the molded diaphragm (key 105).

6. The diaphragm plate and actuator stem (keys 108 and 125) can be taken out of the yoke as an assembly. This assembly can be further disassembled, if desired, by removing the diaphragm head hex screw (key 112) and washer (key 137).

7. Take out the actuator spring (key 110) and the spring seat (key 121).

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657NS2 Actuator

March 2016

8. The lower diaphragm casing (key 122) can be removed from the yoke, if required, by removing the cap screws (key

114) that hold the lower diaphragm casing in place.

9. Unscrew the spring adjusting screw (key 127) from the yoke to complete the disassembly.

Instruction Manual

D103474X012

Size 80 Actuators

Key number references are shown in figure 5.

1. Bypass the control valve. Reduce the actuator loading pressure to atmospheric pressure, and remove the piping or tubing from the upper diaphragm casing connection. Use lock-out procedures to ensure that the above measures stay in effect while you work on the equipment.

2. Remove the hex cap screws, washers, and adjusting screw cover (keys 139, 189, and 138).

3. Unbolt the cap screws and washers (keys 114 and 144), and remove the spring case assembly (key 131) with guide bushing (key 140). If desired, remove the snap ring (key 124) and slide the guide bushing (key 140) out of the spring casing assembly (key 131). Inspect the guide bushing for wear and replace if necessary.

4. Measure and record the distance from the top of the casing flange/upper casing assembly (key 141) and the top of the spring adjusting screw (key 127).

5. Remove the stem connector cap screws (key 103C) and stem connector halves (keys 103A and 103B). If necessary, the actuator may be removed from the valve body by removing the valve body/ bonnet stud hex nuts and washers (keys 102 and 143).

6. Remove the hex jam nut (key 135), spring adjusting screw (key 127), the stud (key 188), the spring seat (key 121), and the spring seat bearing and race (keys 130 and 129).

7. Remove the actuator spring (key 110).

8. Unbolt the diaphragm casing cap screws, hex nuts, and washers (keys 119, 120, and 145), and lift the casing flange/upper casing assembly with seal bushing (key 116) straight up until clear of the actuator stem (key 125).

9. Remove the snap ring (key 124) and slide the seal bushing (key 116) out of the casing flange/upper casing assembly (key 141). Inspect the seal bushing for wear, and replace if necessary. Remove the seal bushing O‐rings (keys 117 and 118).

10. Slide or lift the actuator stem (key 125) with the attached diaphragm plates and diaphragm (keys 107, 108, and

105) out of the actuator.

11. To aid in unscrewing the hex nuts (key 132), attach the stem connector assembly (key 103) onto the actuator stem and grip the stem connector in a vise. This procedure will help secure the actuator stem and help prevent damage.

12. Unscrew the hex nuts (key 132), and slide them, the diaphragm plate (key 108), diaphragm (key 105), and upper diaphragm plate (key 107) off the actuator stem.

Assembly

Size 45 and 70 Actuators

Key number references are shown in figure 4 for size 45 and 70 actuators.

1. Apply Nuclear Grade Never-Seez (key 27) to the threads and spring seat bearing surface of the spring adjusting screw (key 127). Thread the spring adjusting screw (key 127) into the yoke (key 109).

2. Apply Loctite 242 (key 185) to cap screws (key 114). Use the cap screws (key 114) to attach the lower diaphragm casing (key 122) to the yoke. Tighten the cap screws to 41 NSm (30 lbfSft) for size 45 and 102 NSm (75 lbfSft) for the size 70.

3. Insert the spring seat (key 121) and spring (key 110) into the yoke. Be sure the spring seat fits squarely on the adjusting screw and that the spring is properly seated in the spring seat.

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Instruction Manual

D103474X012

657NS2 Actuator

March 2016

4. Apply Loctite 242 (key 185) to diaphragm head hex screw (key 112). Assemble the actuator stem (key 125) and the diaphragm plate (key 108) with the diaphragm head hex screw and washer (key 112 and 137). Tighten the cap screw in accordance with table 3.

5. Insert the stem and diaphragm plate as an assembly, making sure that the stem fits inside the adjusting screw and that the spring fits squarely on the diaphragm plate. Orient the slot side of the actuator stem so that it faces towards an open window of the yoke (recommendation is facing to the opening to the right of the word “FISHER” on the yoke).

6. Install a new diaphragm (key 105) if one is required. Otherwise, replace the molded diaphragm (key 105) onto the diaphragm plate so that the molded edge points outward toward the spring (see figure 4) and the word Fisher printed on the diaphragm is visible. Line up the holes in the diaphragm's edge with the diaphragm casing cap screw holes.

Note

CAUTION

Overtightening the diaphragm casing cap screws and nuts (keys 22 and 23) can damage the diaphragm. Do not exceed a torque of 27 NSm (20 lbfSft) when performing this tightening procedure.

Note

Do not use lubricant on these cap screws and nuts. Fasteners must be clean and dry.

7. Place the upper diaphragm casing (key 104) into position, and replace the diaphragm casing cap screws, washers, and nuts (keys 119, 145, and 120). Tighten the hex nuts (key 120) in the following manner. The first four hex nuts tightened should be diametrically opposed and 90 degrees apart. Tighten these four hex nuts to 13 NSm (10 lbfSft).

8. Tighten the remaining hex nuts in a clockwise, crisscross pattern to 13 NSm (10 lbfSft).

9. Repeat this procedure by tightening four hex nuts, diametrically opposed and 90 degrees apart, to a torque of 27 NSm (20 lbfSft).

10. Tighten the remaining hex nuts in a clockwise, crisscross pattern to 27 NSm (20 lbfSft).

11. After the last bolt is tightened to 27 NSm (20 lbfSft), all of the bolts should be tightened again to 27 NSm (20 lbfSft) in a circular pattern around the bolt circle.

12. Once completed, no more tightening is recommended.

13. Apply NyoGel 718B (key 149) onto the slot of the actuator stem (key 125). Thread the spring adjusting screw (key

127) into the yoke so that it is in the same position recorded during disassembly. Continue to rotate the spring adjusting screw (key 127) until a threaded hole on the hex head aligns with the slot on the actuator stem (key 125).

14. Apply Loctite 242 (key 185) to the cap screw (key 194), insert the cap screw into the threaded hole of the spring adjusting screw (key 127) and the slot on the actuator stem (key 125). Tighten the cap screw to 23 NSm (17 lbfSft).

15. Replace the tubing or piping to the top of the upper diaphragm casing. Mount the actuator, and make the stem connection by following the procedures in the Mounting the Actuator on the Valve section.

Size 80 Actuators

Key number references are shown in figure 5.

1. Carefully slide the upper diaphragm plate (key 107), the diaphragm (key 105), and the diaphragm plate (key 108) onto the actuator stem (key 125). Coat the threads and seat surfaces of the two hex nuts (key 132) with Nuclear

Page 16

657NS2 Actuator

March 2016

Instruction Manual

D103474X012

Grade Never Seez (key 27). Thread the two hex nuts (key 132) lightly against the diaphragm plate. To aid in tightening the hex nuts (key 132), attach the stem connector assembly (key 103) onto the actuator stem, and grip the stem connector in a vise. Tighten the first hex nut (key 132A) to approximately 651 NSm (480 lbfSft) torque. Tighten the second hex nut (key 132B) to 407 NSm (300 lbfSft) torque. Remove the actuator stem subassembly from the vise, and remove the stem connector assembly (key 103) from this subassembly.

2. Place the actuator stem and attached parts into the lower diaphragm casing. Prop the stem up so that the diaphragm plates are positioned as shown in figure 5.

3. Lubricate the O‐rings (keys 117 and 118) and the inside diameter of the seal bushing (key 116) with NyoGel 718B (key 149), as appropriate for the installation. Place the seal bushing and O‐rings in the casing flange/upper casing assembly (key 141), and secure the bushing with the snap ring (key 124).

4. Slide the casing flange/upper casing assembly (key 141) over the actuator stem (key 125) and onto the lower diaphragm casing so that all cap screw holes are aligned.

Note

CAUTION

Overtightening 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).

Note

Do not use lubricant on these cap screws and nuts. Fasteners must be clean and dry.

Table 6. Size 80 Casing Cap Screw Torque Values

DIAPHRAGM MATERIAL

EPDM / Meta-Aramid 41 (30) 82$13 (60$10)

Nitrile, Silicone, FKM/Meta-Aramid 34 (25) 68 (50)

INITIAL TORQUE FINAL TORQUE

NSm (lbfSft) NSm (lbfSft)

5. Fasten the two diaphragm casings together with the cap screws, washers, and nuts (keys 119, 145, and 120) and tighten the hex nuts (key 120) 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 6 for the diaphragm material being used.

6. Tighten the remaining hex nuts in a clockwise, crisscross pattern to the initial torque value found in table 6 for the diaphragm material being used.

7. Repeat this procedure by tightening four hex nuts, diametrically opposed and 90 degrees apart, to the final torque value that is specified in table 6 for the diaphragm material being used.

8. Tighten the remaining hex nuts in a clockwise, crisscross pattern to the final torque value that is specified in table 6 for the diaphragm material being used.

9. After the last hex nut is tightened, complete another tightening sequence. Tighten in a circular pattern around the bolt circle to the final torque value that is specified in table 6 for the diaphragm material being used.

10. Once completed, no more tightening is recommended.

11. Place the spring (key 110) on the casing flange/upper casing assembly (key 141).

12. Place the spring seat (key 121) onto the actuator spring (key 110).

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Instruction Manual

D103474X012

657NS2 Actuator

March 2016

13. Lubricate the spring seat race and bearings (keys 129 and 130) with NyoGel 718B (key 149). Place them on the spring seat. See figure 5.

14. Coat the top threads of the actuator stem (key 125) with Nuclear Grade Never-Seez (key 27). Thread the spring adjusting screw (key 127) and the stud (key 188) onto the actuator stem (key 125) until the distance between the top of the casing flange/upper casing assembly (key 141) and the top of the adjusting screw (key 127) is the same as in step 4 of the Disassembly procedure for size 80 actuators. Thread the hex jam nut (key 135) onto the stud (key

188). Torque to 91 NSm (67 lbfSft).

15. Coat the inside diameter of the guide bushing (key 140) with NyoGel 718B (key 149). Install the guide bushing (key 140) into the spring case assembly (key 131), and secure the bushing with the snap ring (key 124).

16. Place the spring case assembly (key 131) on the upper diaphragm casing. Apply Loctite 242 (key 185) to the cap screws (key 114). Insert and tighten the cap screws and washers (keys 114 and 144) to 102 NSm (75 lbfSft).

17. Install the spring adjusting screw cover (key 138) onto the spring casing assembly (key 131) using cap screws (key

139) and washers (key 189). Torque the cap screws to 23 NSm (17 lbfSft).

18. Mount the actuator, and make the stem connection by following the procedure in the Mounting the Actuator on the Valve section.

Parts Ordering

Each actuator has a serial number stamped on the nameplate. Always refer to this serial number when corresponding with your Emerson Process Management sales office

regarding replacement parts or technical information.

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.

Parts List

Key Description

27 Nuclear Grade Never-Seez (not furnished) 101 Stud, Mounting see following table 102 Nut, Mounting see following table 103A Stem Connector Bolt Half see following table 103B Stem Connector Nut Half see following table 103C Hex Cap Screw, Stem Connector see following table 104 Upper Diaphragm Casing see following table 105* Diaphragm see following table 106 Vent Assy., Small see following table 107 Upper Diaphragm Head see following table 108 Lower Diaphragm Head see following table 109 Yoke or Yoke/Diaphragm Casing Assy see following table 110 Spring see following table 112 Diaphragm Head Hex Screw see following table 113 Travel Scale see following table 114 Hex Cap Screws, Casing see following table 115 Jam Nut, Valve Stem see following table 116* Seal Bushing see following table 117* O-ring, Inside see following table 118* O-ring, Outside see following table 119 Hex Cap Screw, Diaphragm Casing see following table 120 Hex Nuts, Diaphragm Casing see following table 121 Spring Seat see following table 122 Lower Diaphragm Casing see following table 124 Snap Ring see following table 125 Actuator Stem see following table

Key Description Part Number

126 Machine Screw, Travel Scale see following table 127 Spring Adjusting Screw see following table 129* Thrust Bearing Race see following table 130* Thrust Bearing see following table 131 Spring Casing Assembly see following table 132 Hex Jam Nut, Diaphragm Head see following table 135 Jam Nut 1A3412X0052 136 Pipe Bushing see following table 137 Washer, Diaphragm Head see following table 138 Spring Adjusting Screw Cover see following table 139 Hex Cap Screw, Adjusting Screw Cover see following table 140* Guide Bushing see following table 141 Casing Flange/Upper Casing Assembly see following table 143 Washer, Mounting Stud see following table 144 Washer, Casing see following table 145 Washer, Diaphragm Casing see following table 146 Washer, Pointer see following table 147 Hex Cap Screw, Pointer see following table 148 Travel Pointer see following table 149 NyoGel 718B (not furnished) 185 Loctite 242 (not furnished) 186 Washer, Plain 17B4654X012 187 Adaptor, Switch GE56473X012 188 Stud 18A6447X022 189 Washer, Plain 1B8659X0042 190 Yoke Cover see following table 191 Screw, Yoke Cover see following table 192 Washer, Plain GE54163X012 194 Screw, Cap, Hex HD GG17032X012

*Recommended spare parts

Page 18

657NS2 Actuator

March 2016

Figure 4. Size 45 or 70 Fisher 657NS2 Actuator

Instruction Manual

D103474X012

APPL Y LUB

GE49521-E

NOTE: KEY 136 SIZE 70 ONLY KEY 190 AND 191 NOT SHOWN

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Instruction Manual

D103474X012

Figure 5. Size 80 Fisher 657NS2 Actuator

657NS2 Actuator

March 2016

APPL Y LUB

GE49549-E

KEY 190 AND 191 NOT SHOWN

Page 20

657NS2 Actuator

March 2016

657NS2 Troubleshooting

Table 7. 657NS2 Troubleshooting

Problem Possible Solution

Check for debris or damage that may be jamming actuator.

Actuator Stroke is less than full rated travel

Air leakage

Valve does not move

Other Contact Emerson Local Business Partner if more assistance is needed.

Table 8. Fisher 657NS2 Spare Parts*

Part

Description /

Key No.

Diaphragm,

Key 105

O-ring, Key 117

O-ring, Key 118

Seal Bushing,

Key 116

Thrust Bearing

Race, Key 129

Thrust Bearing,

Key 130

Guide Bushing,

Key 140

1. ME/n = construction/installation spares. P/n = preoperational spares. S/n = start-up spares. O/n = operational spares.

2. Dependent on good storage practices and conditions.

3. Not required for all constructions.

Ensure the stem connector is assembled as specified. Verify bench set for proper actuator spring load. See Discussion of Bench Set in this instruction manual. Ensure all parts are intact and assembled as specified. Inspect valve, see valve instruction manual. Verify diaphragm casing bolts are torqued as specified with the proper tightening procedure. Disassemble and inspect sealing surfaces and diaphragm on the actuator diaphragm case and yoke, especially the diaphragm for scratches

or nicks. Replace damaged parts as needed. Ensure the stem connector is assembled as specified. Disassemble and inspect the diaphragm casing and check for debris or damage that may be jamming the actuator. Replaced damaged

parts as needed. Inspect valve, see valve instruction manual. Verify bench set for proper actuator spring load. See Discussion of Bench Set in this instruction manual. Inspect all air connections for leakage.

Replacement

Part Number

Qty Classification

Spare

Part

Code

(1)

Spare Part Requirement Rationale

Recommendation to purchase this spare part is based on shelf life restrictions. The diaphragm is a key component within the

Refer to

following

table

Non-Safety

actuator construction, required to ensure optimal performance over time.

O/n

Degradation of the diaphragm could lead to inconsistencies with valve operation. Emerson Process Management recommends replacing this component every 6 years.

Refer to

following

table

Refer to

following

table

Refer to

following

table

Refer to

following

table

Refer to

following

table

Refer to

following

table

(3)

Non-Safety

If the seal bushing must be removed, this

O/n

O-ring should be replaced.

If the seal bushing must be removed, this

O/n

O-ring should be replaced.

Cycled parts will exhibit wear over time. Based on experience and testing, Emerson Process

O/n

Management recommends replacing this component every 12 years.

Cycled parts will exhibit wear over time. Based on experience and testing, Emerson Process

O/n

Management recommends replacing this component every 12 years.

Cycled parts will exhibit wear over time. Based on experience and testing, Emerson Process

O/n

Management recommends replacing this component every 12 years.

Cycled parts will exhibit wear over time. Based on experience and testing, Emerson Process

O/n

Management recommends replacing this component every 12 years.

Instruction Manual

D103474X012

Shelf

Life

N/A

Shelf Life Rationale

See FGS8A31 rev. P for information regarding elastomer shelf life.

Does not exhibit a tendency to degrade over time.

(2)

*Recommended spare parts

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Instruction Manual

657NS2 Actuator

D103474X012

Table 9. Keys 101 and 143 Yoke Mounting Studs and Washers

ACTUATOR SIZE VALVE SIZE, NPS DATA SHEET

45B 3 116 8 3/4-10 x 3.5 1B958831012 SA 193 B7 1A375738982 70C 6 121 8 3/4-10 x 3.75 1K552131012 SA 193 B7 1A375738982 80A 8 104 8 3/4-10 x 4.25 1P590231012 SA 193 B7 1A375738982

1. Data Sheet Number refers to PV14 Data Sheets for the AP1000 Power Plant Design

(1)

QUANTITY STUD SIZE, INCH

KEY 101

MOUNTING STUD

PART NUMBER

MATERIAL

March 2016

KEY 143

WASHER PART

NUMBER

Table 10. Key 102 Yoke Mounting Nuts

ACTUATOR SIZE VALVE SIZE, NPS DATA SHEET

45B 3 116 8 3/4-10 1A352024072 SA 194 2H 70C 6 121 8 3/4-10 1A352024072 SA 194 2H

80A 8 104 8 3/4-10 1A352024072 SA 194 2H

1. Data Sheet Number refers to PV14 Data Sheets for the AP1000 Power Plant Design

(1)

QUANTITY STUD SIZE, INCH PART NUMBER MATERIAL

Table 11. Key 103 Stem Connector Assy

ACTUATOR SIZE VALVE SIZE, NPS DATA SHEET

45B 3 116 0.5 GG05859X012 70C 6 121 0.75 GG05594X012 80A 8 104 1 GG06723X012

1. Data Sheet Number refers to PV14 Data Sheets for the AP1000 Power Plant Design

(1)

VALVE STEM SIZE, INCH ASSY. PART NUMBER

Table 12. Keys 104 Upper Diaphragm Casing

ACTUATOR SIZE VALVE SIZE, NPS DATA SHEET

45B 3 116 3E830928992 70C 6 121 2N126628992

1. Data Sheet Number refers to PV14 Data Sheets for the AP1000 Power Plant Design

(1)

KEY 104 UPPER DIAPHRAGM CASING

PART NUMBER

Table 13. Key 105* Diaphragm

ACTUATOR SIZE VALVE SIZE, NPS DATA SHEET

45B 3 116 2E8595X0032 70C 6 121 2N1269X0042 80A 8 104 GE45044X022

1. Data Sheet Number refers to PV14 Data Sheets for the AP1000 Power Plant Design

(1)

PART NUMBER

Table 14. Key 107 Upper Diaphragm Head

ACTUATOR SIZE VALVE SIZE, NPS DATA SHEET

45B 3 116 N/A 70C 6 121 N/A 80A 8 104 16A0858X012

1. Data Sheet Number refers to PV14 Data Sheets for the AP1000 Power Plant Design

Table 15. Key 108 Lower Diaphragm Head

ACTUATOR SIZE VALVE SIZE, NPS DATA SHEET

45B 3 116 2H511322012 70C 6 121 2N757522012 80A 8 104 GE44940X012

1. Data Sheet Number refers to PV14 Data Sheets for the AP1000 Power Plant Design

Table 16. Key 109 Yoke or Yoke/Diaphragm Casing Assembly

ACTUATOR SIZE VALVE SIZE, NPS DATA SHEET

45B 3 116 GG05118X022 70C 6 121 GG05123X022

(2)

80A

1. Data Sheet Number refers to PV14 Data Sheets for the AP1000 Power Plant Design

2. The size 80A actuator has a casing/casing flange weldment.

*Recommended spare parts

8 104 GE57013X012

(1)

PART NUMBER

Page 22

657NS2 Actuator

March 2016

Instruction Manual

D103474X012

Table 17. Key 110 Spring

ACTUATOR SIZE VALVE SIZE, NPS DATA SHEET

45B 3 116 1E8266X0032 70C 6 121 1N1287X0022 80A 8 104 1H7475X0012

1. Data Sheet Number refers to PV14 Data Sheets for the AP1000 Power Plant Design

(1)

PART NUMBER

Table 18. Key 112 and Key 137 Diaphragm Head Hex Screw and Washer

ACTUATOR SIZE VALVE SIZE, NPS DATA SHEET

45B 3 116 3/4-16 x 1.25 1E775432982 ASTM A574 1E833628992 70C 6 121 3/4-16 x 1.25 1E775432982 ASTM A574 1E833628992

1. Data Sheet Number refers to PV14 Data Sheets for the AP1000 Power Plant Design

(1)

BOLT SIZE, INCH

KEY 112 SCREW

PART NUMBER

MATERIAL

KEY 137 WASHER

Table 19. Key 114 and Key 144 Hex Cap Screws and Washers

SCREW SIZE,

ACTUATOR SIZE VALVE SIZE, NPS DATA SHEET

45B 3 116 3/8-16 x 0.75 8 1A3684X0082 N/A N/A 70C 6 121 1/2-13 x 0.88 12 1N1293X0092 N/A N/A 80A 8 104 1/2-13 x 1.50 12 1A4533X0162 12 1A5189X0042

1. Data Sheet Number refers to PV14 Data Sheets for the AP1000 Power Plant Design

(1)

INCH

SCREW QTY.

REQUIRED

KEY 114 SCREW

PART NUMBER

WASHER QTY.

REQUIRED

Table 20. Key 113 and 126 Travel Scale and Machine Screw

ACTUATOR SIZE VALVE SIZE, NPS DATA SHEET

45B 3 116 1.5 1E808338992 59081160X12 70C 6 121 3.0 1H746138992 80A 8 104 2.50 1K511038992

1. Data Sheet Number refers to PV14 Data Sheets for the AP1000 Power Plant Design

(1)

VALVE TRAVEL, INCH

KEY 113 TRAVEL SCALE

PART NUMBER

KEY 126 MACHINE

SCREW PART NUMBER

1A3431X0012

PART NUMBER

KEY 144

WASHER PART

NUMBER

Table 21. Key 115 Valve Stem Jam Nut

ACTUATOR SIZE VALVE SIZE, NPS DATA SHEET

45B 3 116 0.5 1/2-20 1A353735252 70C 6 121 0.75 3/4-16 1A351135252 80A 8 104 1 1-14 1C6352X0042

1. Data Sheet Number refers to PV14 Data Sheets for the AP1000 Power Plant Design

(1)

VALVE STEM SIZE, INCH NUT SIZE, INCH PART NUMBER

Table 22. Keys 116*, 117*, 118* and 124 Seal Bushing Components

ACTUATOR SIZE VALVE SIZE, NPS DATA SHEET

45B 3 116 N/A N/A N/A N/A 70C 6 121 N/A N/A N/A N/A

80A 8 104 26A0856X032 16A1178X072 1D4392X0112 1H744037022

1. Data Sheet Number refers to PV14 Data Sheets for the AP1000 Power Plant Design

(1)

KEY 116* SEAL BUSHING PART

NUMBER

KEY 117* INSIDE

O-RING PART

NUMBER

KEY 118* OUTSIDE

O-RING PART

NUMBER

KEY 124 SNAP RING

PART NUMBER

Table 23. Key 119, 120 and 145 Diaphragm Casing Connecting Hex Cap Screws, Nuts and Washers

ACTUATOR

SIZE

45B 3 116 3/8-24 x 1.25 20 1A3683X0042 1A3465X0092 40 1H7231X0032 70C 6 121 3/8-24 x 1.50 28 1A3464X0032 1A3465X0092 56 1H7231X0032 80A 8 104 7/16-20 x 2.0 36 1A9155X0082 1A3403X0062 72 17B4654X032

1. Data Sheet Number refers to PV14 Data Sheets for the AP1000 Power Plant Design

VALVE SIZE,

NPS

DATA SHEET

(1)

SCREW SIZE,

INCH

NUT AND

SCREW QTY.

REQUIRED

KEY 119 HEX

CAP SCREW

PART NUMBER

*Recommended spare parts

KEY 120 HEX

NUT PART

NUMBER

WASHER QTY.

REQUIRED

KEY 145

WASHER PART

NUMBER

Page 23

Instruction Manual

D103474X012

657NS2 Actuator

March 2016

Table 24. Key 121 Spring Seat

ACTUATOR SIZE VALVE SIZE, NPS DATA SHEET

45B 3 116 1R180023122 70C 6 121 1N757722012 80A 8 104 GG06476X012

1. Data Sheet Number refers to PV14 Data Sheets for the AP1000 Power Plant Design

Table 25. Key 122 Lower Diaphragm Casing

ACTUATOR SIZE VALVE SIZE, NPS DATA SHEET

45B 3 116 3E831625062 70C 6 121 2N127125062

1. Data Sheet Number refers to PV14 Data Sheets for the AP1000 Power Plant Design

Table 26. Key 125 Actuator Stem

ACTUATOR SIZE VALVE SIZE, NPS DATA SHEET

45B 3 116 GG17087X012 70C 6 121 GG17027X012 80A 8 104 GG06475X012

1. Data Sheet Number refers to PV14 Data Sheets for the AP1000 Power Plant Design

Table 27. Key 127 Spring Adjusting Screw

ACTUATOR SIZE VALVE SIZE, NPS DATA SHEET

45B 3 116 GG14378X012 16A1134X022 GG14378X012 70C 6 121 GG14377X012 GG14354X012 GG14377X012 80A 8 104 GG06478X012 1A3412X0052 18A6444X032

1. Data Sheet Number refers to PV14 Data Sheets for the AP1000 Power Plant Design

(1)

KEY 127 SPRING

ADJUSTING SCREW

PART NUMBER

JAM NUT STUD

PART NUMBER

Table 28. Key 106 Small Vent Assembly

ACTUATOR SIZE VALVE SIZE, NPS DATA SHEET

80A 8 104 17A5515X012

1. Data Sheet Number refers to PV14 Data Sheets for the AP1000 Power Plant Design

(1)

Table 29. Keys 124 and 140* Guide Bushing Components

ACTUATOR SIZE VALVE SIZE, NPS DATA SHEET

80A 8 104 1H744037022 GG06477X022

1. Data Sheet Number refers to PV14 Data Sheets for the AP1000 Power Plant Design

(1)

KEY 124 SNAP RING PART

NUMBER

Table 30. Key 131 Spring Casing Assembly

ACTUATOR SIZE VALVE SIZE, NPS DATA SHEET

80A 8 104 GG06616X012

1. Data Sheet Number refers to PV14 Data Sheets for the AP1000 Power Plant Design

(1)

Table 31. Key 132 Diaphragm Head Jam Nuts

ACTUATOR SIZE VALVE SIZE, NPS DATA SHEET

80A 8 104 1C1122X0042

1. Data Sheet Number refers to PV14 Data Sheets for the AP1000 Power Plant Design

(1)

Table 32. Key 138 and 139 Spring Adjusting Screw Cover and Hex Screws / Washers

KEY 138

ADJUSTING

ACTUATOR SIZE VALVE SIZE, NPS DATA SHEET

80A 8 104 GG06480X012 5/16-18 x 0.50 2 1C2752X0072

1. Data Sheet Number refers to PV14 Data Sheets for the AP1000 Power Plant Design

(1)

SCREW COVER PART NUMBER

SCREW SIZE

(INCH)

QTY. REQUIRED

PART NUMBER

KEY 140* GUIDE BUSHING

PART NUMBER

KEY 139 HEX CAP

SCREW PART

NUMBER

PART NUMBER

WASHERS

1B8659X0042

*Recommended spare parts

Page 24

657NS2 Actuator

March 2016

Instruction Manual

D103474X012

Table 33. Key 136 Pipe Bushing

ACTUATOR SIZE VALVE SIZE, NPS DATA SHEET

70C 6 121 1C3790X0012

1. Data Sheet Number refers to PV14 Data Sheets for the AP1000 Power Plant Design

(1)

PART NUMBER

Table 34. Key 141 Casing Flange/Upper Casing Assembly

ACTUATOR SIZE VALVE SIZE, NPS DATA SHEET(1) PART NUMBER

80A 8 104 GE57014X012

1. Data Sheet Number refers to PV14 Data Sheets for the AP1000 Power Plant Design

Table 35. Key 129* and 130* Thrust Bearing Race and Thrust Bearing

ACTUATOR SIZE VALVE SIZE, NPS DATA SHEET(1)

80A 8 104 1K6254X0022 1K6253X0022

1. Data Sheet Number refers to PV14 Data Sheets for the AP1000 Power Plant Design

KEY 129* THRUST BEARING

RACE PART NUMBER

KEY 130* THRUST BEARING

PART NUMBER

Table 36. Key 146, 147, and 148 Pointer Washer, Pointer Hex Cap Screw, Travel Pointer

ACTUATOR SIZE VALVE SIZE, NPS DATA SHEET(1)

45B 3 116 N/A 1A5823X0032 GG05867X012 70C 6 121 N/A 1A5823X0032 GG05598X012 80A 8 104 1B8659X0042 GE56486X012 GG06950X012

1. Data Sheet Number refers to PV14 Data Sheets for the AP1000 Power Plant Design

KEY 146 POINTER

WASHER PART NUMBER

KEY 147 POINTER HEX

CAP SCREW PART

NUMBER

KEY 148 TRAVEL

POINTER PART NUMBER

Table 37. Key 190 and 191 Yoke Cover and Screws

ACTUATOR SIZE VALVE SIZE, NPS DATA SHEET(1)

45B 3 116 70C 6 121 GG08473X012 10-24 X 0.50 1A3406X0012 80A 8 104 GG08471X012 5/16-18 X 0.50 1C2752X0042

1. Data Sheet Number refers to PV14 Data Sheets for the AP1000 Power Plant Design

YOKE COVER

QTY

KEY 190 COVER

PART NUMBER

GG08470X012 5/16-18 X 0.50

SCREW SIZE,

INCH

SCREW QTY

REQUIRED

KEY 191 SCREW

PART NUMBER

1C2752X0042

*Recommended spare parts

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