Emerson Fisher EAD User manual

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
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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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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: [phone] 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

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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
ED
(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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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.
1
11
1
1
1
1
1
1
1
1
1
1
1
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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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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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)
1
1
11
1
11
1
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.