Emerson Fisher EAD Manual de usuario

www.Fisher.com

Fisher™ED and EAD easy‐e™Valves

CL125 through CL600

Contents

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

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

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

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

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

Installation 3..................................

Maintenance 4.................................

Packing Lubrication 5..........................

Packing Maintenance 5.........................

Replacing Packing 6........................

Trim Maintenance 10..........................

Disassembly 10............................

Lapping Metal Seats 11.....................

Valve Plug Maintenance 12..................

Assembly 13..............................

Retrofit: Installing C‐seal Trim 13................

Replacement of Installed C‐seal Trim 15...........

Trim Removal (C‐seal Constructions) 15.......

Lapping Metal Seats (C‐seal Constructions) 19..

Remachining Metal Seats

(C‐seal Constructions) 19.................

Trim Replacement (C‐seal Constructions) 19...

ENVIRO‐SEALtBellows Seal Bonnet 20...........

Replacing a Plain or Extension Bonnet with an

ENVIRO‐SEAL Bellows Seal Bonnet

(Stem/Bellows Assembly) 20..............

Replacement of an Installed ENVIRO‐SEAL

Bellows Seal Bonnet

(Stem/Bellows Assembly) 23..............

Figure 1. Fisher ED Valve with 667 Actuator

W1916‐2

Purging the ENVIRO‐SEAL

Bellows Seal Bonnet 24...................

Parts Ordering 24...............................

Parts Kits 25...................................

Parts List 29...................................

Introduction

Scope of Manual

This instruction manual includes installation, maintenance, and parts information for NPS 1 through 8 Fisher ED valves,

and NPS 1 through 6 EAD valves, through CL600 ratings. Refer to separate manuals for instructions covering the

actuator and accessories.

Do not install, operate, or maintain ED or EAD valves without being fully trained and qualified in valve, actuator, and

accessory installation, operation, and maintenance. To avoid personal injury or property damage, it is important to

carefully read, understand, and follow all the contents of this manual, including all safety cautions and warnings. If you

have any questions about these instructions, contact your Emerson sales office or Local Business Partner before

proceeding.

Instruction Manual

D100390X012

ED Valve

November 2017

Instruction Manual

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ED Valve

November 2017

Table 1. Specifications

End Connection Styles

Cast Iron Valves

Flanged: CL125 flat‐face or 250 raised‐face flanges per

ASME B16.1

Steel and Stainless Steel Valves

Flanged: CL150, 300, and 600 raised‐face or ring‐type

joint flanges per ASME B16.5

Screwed or Socket Welding: All available ASME B16.11

schedules that are consistent with CL600 per ASME

B16.34

Buttwelding: NPS 1 through 8

Schedules 40 or 80 consistent with ASME B16.25

Maximum Inlet Pressure(1)

Cast Iron Valves

Flanged: Consistent with CL125B or 250B

pressure‐temperature ratings per ASME B16.1

Steel and Stainless Steel Valves

Flanged: Consistent with CL150, 300, and 600(2)

pressure‐temperature ratings per ASME B16.34

Screwed or Welding: Consistent with CL600

pressure‐temperature ratings per ASME B16.34

Shutoff Classifications per ANSI/FCI 70‐2

and IEC 60534‐4

Standard: Class II

Optional: Class III‐‐For valves with graphite piston ring

and 3.4375 inch or larger port diameter; Class IV‐‐For

valves with multiple graphite piston rings and 4.375

inch or larger port diameter

C‐seal trim: High‐temperature, Class V.

See table 2

Flow Characteristics

Standard Cages: JLinear, Jquick opening, or

Jequal percentage

Whisper Trimtand WhisperFlotCages: Linear

Flow Directions

Linear, Quick Opening, or Equal Percentage Cage:

Normally down

Whisper Trim and WhisperFlo Cages: Always up

Approximate Weights

NPS 1 & 1‐1/4 valves: 14 kg (30 lb)

NPS 1‐1/2 valves: 20 kg (45 lb)

NPS 2 valves: 30 kg (67 lb)

NPS 2‐1/2 valves: 45 kg (100 lb)

NPS 3 valves: 57 kg (125 lb)

NPS 4 valves: 77 kg (170 lb)

NPS 6 valves: 159 kg (350 lb)

NPS 8 valves: 408 kg (900 lb)

1. The pressure/temperature limits in this manual and any applicable standard or code limitation for valve should not be exceeded.

2. Certain bonnet bolting material selections may require a CL600 easy‐e valve assembly to be derated. Contact your Emerson sales office or Local Business Partner.

Description

These single‐port valves have cage guiding, quick‐change trim, and balanced push‐down‐to‐close valve plug action.

Valve configurations are as follows:

ED‐‐Globe‐style valve (figure 1) with metal‐to‐metal seating for all general applications over a wide variety of pressure

drops and temperatures.

EAD‐‐Angle version of ED, used to facilitate piping or in applications where a self‐draining valve is required.

C‐seal trim is available for ED valves, CL150, 300, and 600, in NPS 2‐1/2, 3, 4, 6, and 8. C‐seal trim is available for EAD

valves, CL150, 300, and 600, in NPS 3, 4, and 6.

With C‐seal trim, a balanced valve can achieve high‐temperature, Class V shutoff. Because the C‐seal plug seal is

formed from metal (N07718 nickel alloy) rather than an elastomer, a valve equipped with the C‐seal trim can be

applied in processes with a fluid temperature of up to 593_C (1100_F), provided other material limits are not

exceeded.

Specifications

Typical specifications for these valves are shown in table 1.

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November 2017

Educational Services

For information on available courses for Fisher ED and EAD valves, 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

Installation

WARNING

Always wear protective gloves, clothing, and eyewear when performing any installation operations to avoid personal

injury.

Personal injury or equipment damage caused by sudden release of pressure may result if the valve assembly is installed

where service conditions could exceed the limits given in table 1 or on the appropriate nameplates. To avoid such injury or

damage, provide a relief valve for over‐pressure protection as required by government or accepted industry codes and

good engineering practices.

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.

CAUTION

When ordered, the valve configuration and construction materials were selected to meet particular pressure, temperature,

pressure drop, and controlled fluid conditions. Responsibility for the safety of process media and compatibility of valve

materials with process media rests solely with the purchaser and end‐user. Since some body/trim material combinations

are limited in their pressure drop and temperature ranges, do not apply any other conditions to the valve without first

contacting your Emerson sales office or Local Business Partner.

1. Before installing the valve, inspect the valve and associated equipment for any damage and any foreign material.

2. Make certain the valve body interior is clean, that pipelines are free of foreign material, and that the valve is

oriented so that pipeline flow is in the same direction as the arrow on the side of the valve.

3. The control valve assembly may be installed in any orientation unless limited by seismic criteria. However, the

normal method is with the actuator vertical above the valve. Other positions may result in uneven valve plug and

cage wear, and improper operation. With some valves, the actuator may also need to be supported when it is not

vertical. For more information, consult your Emerson sales office or Local Business Partner.

4. Use accepted piping and welding practices when installing the valve in the line. For flanged valves, use a suitable

gasket between the valve and pipeline flanges.

CAUTION

Depending on valve body materials used, post weld heat treating may be required. If so, damage to internal elastomeric

and plastic parts, as well as internal metal parts is possible. Shrink‐fit pieces and threaded connections may also loosen. In

Instruction Manual

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November 2017

general, if post weld heat treating is to be performed, all trim parts should be removed. Contact your Emerson sales office

or Local Business Partner for additional information.

5. With a leak‐off bonnet construction, remove the pipe plugs (keys 14 and 16, figure 18) to hook up the leak‐off

piping. If continuous operation is required during inspection or maintenance, install a three‐valve bypass around

the control valve assembly.

6. If the actuator and valve are shipped separately, refer to the actuator mounting procedure in the appropriate

actuator instruction manual.

Table 2. Additional Shutoff Classification

Valve Valve Size, NPS Port Diameter, Inches Cage Style Leakage Class

(CL150‐600)

2‐1/2 2.875 Equal Percentage, Linear, Whisper I, CavitroltIII, 1 stage

V (for port

diameters from

2.875

through 8‐inch with

optional C‐seal trim)

3 3.4375

3 2.875 Cavitrol III, 2 stage

4 2.875

4 4.375 Equal Percentage, Linear, Whisper I, Cavitrol III, 1 stage

65.375 Whisper III (A3, B3, D3, D3), Cavitrol III, 2 stage

7Equal Percentage, Linear, Whisper I, Cavitrol III, 1 stage

87Cavitrol III, 2 stage

8Equal Percentage, Linear, Whisper I, Cavitrol III, 1 stage

WARNING

Personal injury could result from packing leakage. Valve packing was tightened before shipment; however, the packing

might require some readjustment to meet specific service conditions. Check with your process or safety engineer for any

additional measures that must be taken to protect against process media.

Valves with ENVIRO‐SEAL live‐loaded packing or HIGH‐SEAL live‐loaded packing will not require this initial

re‐adjustment. See the Fisher instruction manuals, ENVIRO‐SEAL Packing System for Sliding‐Stem Valves or HIGH‐SEAL

Live‐Loaded Packing System (as appropriate), for packing instructions. If you wish to convert your present packing

arrangement to ENVIRO‐SEAL packing, refer to the retrofit kits listed in the Parts Kit sub‐section near the end of this

manual.

Maintenance

Valve parts are subject to normal wear and must be inspected and replaced as necessary. Inspection and maintenance

frequency depends on the severity of service conditions. This section includes instructions for packing lubrication,

packing maintenance, trim maintenance, and ENVIRO‐SEAL bellows seal bonnet replacement. All maintenance

operations may be performed with the valve in the line.

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.

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November 2017

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 pneumatic actuator loading pressure and relieve any actuator spring precompression.

D Use lock‐out procedures to be sure that the above measures stay in effect while you work on the equipment.

D The valve packing box may contain process fluids that are pressurized, even when the valve has been removed from the

pipeline. Process fluids may spray out under pressure when removing the packing hardware or packing rings, or when

loosening the packing box pipe plug.

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

media.

Note

Whenever a gasket seal is disturbed by removing or shifting gasketed parts, install a new gasket during reassembly. This ensures a

good gasket seal because the used gasket may not seal properly.

Packing Lubrication

Note

ENVIRO‐SEAL or HIGH‐SEAL packing does not require lubrication.

WARNING

To avoid personal injury or property damage resulting from fire or explosion, do not lubricate packing used in oxygen

service or in processes with temperatures over 260_C (500_F).

If a lubricator or lubricator/isolating valve (figure 2) is provided for PTFE/composition or other packings that require

lubrication, it will be installed in place of the pipe plug (key 14, figure 18). Use a good quality silicon‐based lubricant.

Do not lubricate packing used in oxygen service or in processes with temperatures over 260_C (500_F). To operate the

lubricator, simply turn the cap screw clockwise to force the lubricant into the packing box. The lubricator/isolating

valve operates the same way except open the isolating valve before turning the cap screw and then close the isolating

valve after lubrication is completed.

Packing Maintenance

Note

For valves with ENVIRO‐SEAL packing, see the Fisher instruction manual, ENVIRO‐SEAL Packing System for Sliding‐Stem Valves,

D101642X012, for packing instructions.

For valves with HIGH‐SEAL packing, see the Fisher instruction manual, HIGH‐SEAL Live‐Loaded Packing System, D101453X012, for

packing instructions.

Key numbers refer to figure 3 for PTFE V‐ring packing and to figure 4 for PTFE/composition packing, unless otherwise

indicated.

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Figure 2. Lubricator and Lubricator/Isolating Valve (optional)

LUBRICATOR

LUBRICATOR/ISOLATING VALVE

10A9421‐A

AJ5428‐D

A0832‐2

For spring‐loaded single PTFE V‐ring packing, the spring (key 8, figure 3) maintains a sealing force on the packing. If

leakage is noted around the packing follower (key 13, figure 3), check to be sure the shoulder on the packing follower

is touching the bonnet. If the shoulder is not touching the bonnet, tighten the packing flange nuts (key 5, figure 18)

until the shoulder is against the bonnet. If leakage cannot be stopped in this manner, proceed to the Replacing

Packing procedure.

If there is undesirable packing leakage with other than spring‐loaded packing, first try to limit the leakage and

establish a stem seal by tightening the packing flange nuts.

If the packing is relatively new and tight on the stem, and if tightening the packing flange nuts does not stop the

leakage, the valve stem may be worn or nicked so that a seal cannot be made. The surface finish of a new valve stem is

critical for making a good packing seal. If the leakage comes from the outside diameter of the packing, the leakage

may be caused by nicks or scratches around the packing box wall. If performing any of the following procedures,

inspect the valve stem and packing box wall for nicks and scratches.

Replacing Packing

WARNING

Refer to the WARNING at the beginning of the Maintenance section in this instruction manual.

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. If using a power actuator, also shut off all pressure lines to the power

actuator, and release all pressure from the actuator. Use lock‐out procedures to be sure that the above measures

stay in effect while you work on the equipment.

2. Disconnect the operating lines from the actuator and any leak‐off piping from the bonnet. Disconnect the stem

connector, then remove the actuator from the valve by unscrewing the yoke locknut (key 15, figure 18) or the hex

nuts (key 26, figure 18).

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Figure 3. PTFE V‐Ring Packing Arrangements for Plain or Extension Bonnets

UPPER WIPER

(KEY 12)

PACKING

FOLLOWER

(KEY 13)

WASHER

(KEY 10)

SPRING

(KEY 8)

PACKING BOX

RING (KEY 11)

UPPER WIPER

(KEY 12)

PACKING

FOLLOWER

(KEY 13)

PACKING BOX

RING (KEY 11)

LOWER WIPER

MALE

ADAPTOR

PACKING RING

FEMALE

ADAPTOR FEMALE

ADAPTOR

PACKING RING

MALE

ADAPTOR

LOWER

WIPER

SPACER (KEY 8)

UPPER WIPER

(KEY 12)

PACKING

FOLLOWER (KEY 13)

MALE

ADAPTOR

PACKING RING (KEY 7)

PACKING BOX

RING (KEY 11)

FEMALE

ADAPTOR

LANTERN

RING

(KEY 8)

LOWER

WIPER

ASSEMBLY 1

(POSITIVE

PRESSURES)

ASSEMBLY 2

(VACUUM) ASSEMBLY 3

(POSITIVE

PRESSURES

& VACUUM)

ASSEMBLY 1

(POSITIVE

PRESSURES)

ASSEMBLY 2

(VACUUM) ASSEMBLY 2

(VACUUM)

ASSEMBLY 3

(POSITIVE

PRESSURES

& VACUUM)

ASSEMBLY 3

(POSITIVE

PRESSURES

& VACUUM)

ASSEMBLY 1

(POSITIVE

PRESSURES)

FOR 316 OR 17‐4PH SST

METAL PACKING BOX PARTS

FOR ALL OTHER METAL PACKING

BOX PART MATERIALS

9.5 mm (3/8 INCH) STEM 12.7 mm (1/2 INCH) STEM 19.1, 25.4, OR 31.8 mm

(3/4, 1, OR 1‐1/4 INCH) STEM

SINGLE ARRANGEMENTS

DOUBLE ARRANGEMENTS

NOTES:

MALE ADAPTOR, PACKING RING, FEMALE ADAPTOR,

AND LOWER WIPER ARE PART OF PACKING SET (KEY 6).

2 REQ'D FOR DOUBLE ARRANGEMENTS, EXCEPT LOWER WIPER.

C0783

12A7837‐A

12A8187-C 12A7814-C 12A7839-A

Table 3. Body‐to‐Bonnet Bolt Torque Guidelines

Valve Size, NPS Bolt Torques(1, 3)

ED EAD SA193‐B7 SA193‐B8M(2)

NSm LbfSft NSm LbfSft

1‐1/4 or less 1 129 95 64 47

1‐1/2, 1‐1/2 x 1, 2, or 2 x 1 2 or 2 x 1 96 71 45 33

2‐1/2 or 2‐1/2 x 1‐1/2 3 or 3 x 1‐1/2 129 95 64 47

3, 3 x 2, or 3 x 2‐1/2 4 or 4 x 2 169 125 88 65

4, 4 x 2‐1/2, or 4 x 3 6 or 6 x 2‐1/2 271 200 156 115

6‐ ‐ ‐ 549 405 366 270

8‐ ‐ ‐ 746 550 529 390

1. Determined from laboratory tests.

2. SA193‐B8M annealed.

3. For other materials, contact your Emerson sales office or Local Business Partner for torque values.

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3. Loosen the packing flange nuts (key 5, figure 18) so that the packing is not tight on the valve stem. Remove any

travel indicator parts and stem locknuts from the valve stem threads.

WARNING

To avoid personal injury or property damage caused by uncontrolled movement of the bonnet, loosen the bonnet by

following the instructions in the next step. Do not remove a stuck bonnet by pulling on it with equipment that can stretch

or store energy in any other manner. The sudden release of stored energy can cause uncontrolled movement of the bonnet.

Note

The following step also provides additional assurance that the valve body fluid pressure has been relieved.

CAUTION

Avoid damaging the seating surface caused by the valve plug and stem assembly dropping from the bonnet (key 1, figure

18) after being lifted part way out. When lifting the bonnet, temporarily install a valve stem locknut on the valve stem. This

locknut will prevent the valve plug and stem assembly from dropping out of the bonnet.

If the cage starts to lift with the bonnet, tap it with a plastic mallet, or other soft material, to be sure it stays in the valve.

4. Hex nuts (key 16, figure 19, 20, or 21) or cap screws (not shown) attach the bonnet (key 1, figure 18) to the valve

body (key 1, figure 19, 20, or 21). Loosen these nuts or cap screws approximately 3 mm (1/8 inch). Then loosen the

body‐to‐bonnet gasketed joint by either rocking the bonnet or prying between the bonnet and valve. Work the

prying tool around the bonnet until the bonnet loosens. If no fluid leaks from the joint, remove the nuts or cap

screws completely and carefully lift the bonnet off the valve.

5. Remove the locknut and separate the valve plug and stem from the bonnet. Set the parts on a protective surface to

prevent damage to gasket or seating surfaces.

6. Remove the bonnet gasket (key 10, figure 19, 20, or 21) and cover the opening in the valve to protect the gasket

surface and prevent foreign material from getting into the valve body cavity.

7. Remove the packing flange nuts, packing flange, upper wiper, and packing follower (keys 5, 3, 12, and 13, figure

18). Carefully push out all the remaining packing parts from the valve side of the bonnet using a rounded rod or

other tool that will not scratch the packing box wall. Clean the packing box and the metal packing parts.

8. Inspect the valve stem threads and packing box surfaces for any sharp edges which might cut the packing.

Scratches or burrs could cause packing box leakage or damage to the new packing. If the surface condition cannot

be improved by light sanding, replace the damaged parts by following the appropriate steps in the Trim

Maintenance procedure.

9. Remove the cover protecting the valve body cavity and install a new bonnet gasket (key 10, figure 19 through 21),

making sure the gasket seating surfaces are clean and smooth. Place the valve plug and stem into the valve body,

making sure it is properly centered on the seat ring. Then slide the bonnet over the stem and onto the stud bolts

(key 16, figure 19, 20, or 21) or onto the valve body cavity if cap screws (not shown) will be used instead.

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November 2017

Figure 4. PTFE/Composition Packing Arrangements for Plain or Extension Bonnets

UPPER WIPER

(KEY 12)

PACKING

FOLLOWER (KEY 13)

PACKING RING (KEY 7)

PACKING BOX

RING (KEY 11)

LANTERN RING

(KEY 8)

12A8088‐A

12A7815‐A

12A8173‐A

A5904

9.5 mm

(3/8‐INCH)

STEM

12.7 mm

(1/2‐INCH)

STEM

19.1, 25.4, & 31.8 mm

(3/4, 1 & 1‐1/4 INCH)

STEM

TYPICAL (DOUBLE) ARRANGEMENT

Note

Proper performance of the bolting procedures in step 10 compresses the spiral wound gasket (key 12, figure 19 or 20) or load ring

(key 26, figure 21) enough to both load and seal the seat ring gasket (key 13, figure 19, 20, or 21). It also compresses the outer

edge of the bonnet gasket (key 10, figure 19 through 21) enough to seal the body‐to‐bonnet joint.

The bolting procedures in step 10 include‐‐but are not limited to‐‐ensuring that bolting threads are clean, and evenly tightening

the cap screws, or the nuts onto the studs, in a crisscross pattern. Tightening one cap screw or nut may loosen an adjacent cap

screw or nut. Repeat the crisscross tightening pattern several times until each cap screw or nut is tight and the body‐to‐bonnet

seal is made. When the operating temperature has been reached, perform the torquing procedure once again.

10. Install bolting, using accepted bolting procedures during tightening, so that the body‐to‐bonnet joint will

withstand test pressures and application service conditions. Use the bolt torques in table 3 as guidelines.

11. Install new packing and the metal packing box parts according to the appropriate arrangement in figure 3, 4, or 5.

Place a smooth‐edged pipe over the valve stem and gently tap each soft packing part into the packing box.

12. Slide the packing follower, upper wiper, and packing flange (keys 13, 12, and 3, figure 18) into position. Lubricate

the packing flange studs (key 4, figure 18) and the faces of the packing flange nuts (key 5, figure 18). Install the

packing flange nuts.

13. For spring‐loaded PTFE V‐ring packing, tighten the packing flange nuts until the shoulder on the packing follower

(key 13, figure 18) contacts the bonnet.

For graphite packing, tighten the packing flange nuts to the maximum recommended torque shown in table 4. Then,

loosen the packing flange nuts, and retighten them to the recommended minimum torque shown in table 4.

For other packing types, tighten the packing flange nuts alternately in small equal increments until one of the nuts

reaches the minimum recommended torque shown in table 4. Then, tighten the remaining flange nut until the

packing flange is level and at a 90‐degree angle to the valve stem.

For ENVIRO‐SEAL or HIGH‐SEAL live‐loaded packing, refer to the note at the beginning of Packing Maintenance.

14. Mount the actuator on the valve assembly and reconnect the actuator and valve stem according to the procedure

in the appropriate actuator instruction manual.

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D100390X012

ED Valve

November 2017

Figure 5. Graphite Ribbon/Filament Packing for Plain or Extension Bonnets

NOTES:

0.102 mm (0.004 INCH) THICK SACRIFICIAL ZINC WASHERS; USE ONLY ONE BELOW EACH GRAPHITE RIBBON RING.

PACKING

FOLLOWER (KEY 13)

GRAPHITE RIBBON

PACKING RING (KEY 7)

PACKING BOX

RING (KEY 11)

LANTERN RING (KEY 8)

GRAPHITE FILAMENT

PACKING RING

(KEY 7)

PACKING

FOLLOWER (KEY 13)

GRAPHITE RIBBON

PACKING RING (KEY 7)

PACKING BOX

RING (KEY 11)

LANTERN RING (KEY 8)

GRAPHITE FILAMENT

PACKING RING (KEY 7)

SINGLE ARRANGEMENTS DOUBLE ARRANGEMENTS

9.5 mm

(3/8‐INCH)

STEM

12.7 mm

(1/2‐INCH)

STEM

19.1, 25.4, OR 31.8 mm

(3/4, 1, OR 1‐1/4 INCH)

STEM

9.5 mm

(3/8‐INCH)

STEM

12.7 mm

(1/2‐INCH)

STEM

19.1, 25.4, OR 31.8 mm

(3/4, 1, OR 1‐1/4 INCH)

STEM

B2350

14A3411‐C 13A9775‐E 13A9776‐D 14A2153‐D 14A1849‐E 14A1780‐D

Trim Maintenance

WARNING

Observe the warning at the start of the Maintenance section.

For C‐seal construction, see the appropriate C‐seal sections in this instruction manual.

Except where indicated, key numbers in this section are referenced in figure 19 for standard NPS 1 through 6

constructions, figure 20 for Whisper Trim III cage detail, figure 21 for the NPS 8 ED valve, and figures 22 and 23 for

WhisperFlo trim. Some valve plug constructions require three piston rings (key 6).

Disassembly

1. Remove the actuator and the bonnet according to steps 1 through 5 of the Replacing Packing procedure in the

Maintenance section.

WARNING

Avoid personal injury or property damage from valve or packing leakage.

The graphite piston rings in an ED or EAD valve are brittle and in two pieces. Use care to avoid damage to the piston rings

caused by dropping or rough handling.

Any damage to the gasket sealing surfaces could cause the valve to leak. The surface finish of the valve stem (key 7) is

critical for making a good packing seal. The inside surface of the cage or cage/baffle assembly (key 3), or cage retainer (key

31), is critical for smooth operation of the valve plug and for making a seal with the piston rings (key 6). The seating

surfaces of the valve plug (key 2) and seat ring (key 9) are critical for proper shutoff. Protect these parts accordingly while

disassembling the trim.

2. Remove the packing flange nuts, packing flange, upper wiper, and packing follower (keys 5, 3, 12, and 13, figure

18). Carefully push out all the remaining packing parts from the valve side of the bonnet using a rounded rod or

other tool that will not scratch the packing box wall. Clean the packing box and the metal packing parts.

3. Inspect the valve stem threads and packing box surfaces for any sharp edges which might cut the packing.

Scratches or burrs could cause packing box leakage or damage to the new packing. If the surface condition cannot

be improved by light sanding, replace the damaged parts.

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