Instruction Manual
D100392X012
April 2009
EH Valves (NPS 8 through 14)
Fisherr EHD and EHT NPS 8 through 14
Sliding-Stem Control Valves
Contents
Introduction 1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Scope of Manual 1. . . . . . . . . . . . . . . . . . . . . . . . . .
Description 2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Specifications 2. . . . . . . . . . . . . . . . . . . . . . . . . . . .
Installation 3. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Principle of Operation 4. . . . . . . . . . . . . . . . . . . . . . .
Maintenance 4. . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Packing Lubrication 5. . . . . . . . . . . . . . . . . . . . . . .
Packing Maintenance 6. . . . . . . . . . . . . . . . . . . . . .
Replacing Packing 6. . . . . . . . . . . . . . . . . . . . . . .
Trim Removal 10. . . . . . . . . . . . . . . . . . . . . . . . . . .
EHD, EHT Valve Plug Maintenance 10. . . . . . . .
Lapping Seats 11. . . . . . . . . . . . . . . . . . . . . . . . . . .
Trim Replacement 11. . . . . . . . . . . . . . . . . . . . . . .
Retrofit: Installing Bore Seal Trim 13. . . . . . . . . . .
Replacement of Installed Bore Seal Trim 15. . . .
Trim Removal (Bore Seal Constructions) 15. . .
Lapping Metal Seats
(Bore Seal Constructions) 16. . . . . . . . . . . . .
Remachining Metal Seats
(Bore Seal Constructions) 16. . . . . . . . . . . . .
Trim Replacement
(Bore Seal Constructions) 17. . . . . . . . . . . . .
Actuator Mounting 18. . . . . . . . . . . . . . . . . . . . . . .
Parts Ordering 18. . . . . . . . . . . . . . . . . . . . . . . . . . . .
Parts Kits 19. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Parts List 21. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Bonnet Assembly 21. . . . . . . . . . . . . . . . . . . . . . . .
Valve Assembly 23. . . . . . . . . . . . . . . . . . . . . . . . .
W2992-1/IL
Figure 1. Fisherr EH Series Control Valve
with 667 Actuator
Introduction
Scope of Manual
This instruction manual includes installation,
maintenance, and parts ordering information for
NPS 8 through 14 Fisherr EHD and EHT
sliding-stem globe-style control valves. Refer to
separate manuals for instructions covering the
actuator, positioner, and accessories.
www.Fisher.com
Do not install, operate, or maintain an EH valve
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 before
proceeding.
Instruction Manual
EH Valves (NPS 8 through 14)
Table 1. Specifications
End Connection Styles
Buttwelding: All available ASME B16.25
schedules that are compatible with ASME B16.34
pressure/temperature ratings
Flanged Ends: CL1500 or 2500 J raised-face
(RF) or J ring-type joint (RTJ) flanges per ASME
B16.5
Shutoff Classifications
See table 2
Bore seal trim: High-temperature, Class V.
See table 3
(1)
Whisper Trimr III Cages: J Linear or
J modified characteristics available upon request
Flow Direction
Normally flow down (in through the cage windows
and out through the seat ring) for all cage styles
except for applications using either a Whisper
Trim III cage or a diverter cone plug, both of which
are flow up only
Additional Specifications
For specifications such as materials, valve plug
travels, and port, yoke boss, and stem diameters,
April 2009
see the Parts List section
Flow Characteristic
Standard Cages: J Linear, J equal percentage,
or J modified equal percentage
1. The pressure or temperature limits in this manual and any applicable standard limitations should not be exceeded.
2. Valves using an equal percentage cage may be travelled an additional 13 mm (0.5 inch) if desired to obtain additional capacity; flow characteristic becomes modified equal percentage.
(2)
Approximate Weights
See table 4
Table 2. Shutoff Classifications
VALVE
DESIGN
EHD
EHT
EHT w/ PEEK
Anti-Extrusion Rings
1. Per ANSI/FCI 70-2 and IEC 60534-4
2. Poly Ether Ether Ketone
(2)
V to 316_C (600_F)
(1)
ANSI/FCI
LEAKAGE
CLASS
III—Standard
IV—Optional
IV—Standard
V—Optional
Description
The EHD and EHT valves, shown in figure 1, are
large, sliding-stem, high-pressure, globe-style
valves. These valves have metal seats, cage
guiding, and push-down-to-close valve plug action.
The EHD and EHT valves feature balanced valve
plugs. To provide a seal between the valve plug and
cage, the EHD valve plug has piston rings; the EHT
valve plug has a pressure-assisted seal ring.
Bore seal trim is available for EHD valves, CL1500,
NPS 8 and 10 and CL2500, NPS 8, 10, 12, and 14.
With Bore seal trim, a balanced valve can achieve
high-temperature, Class V shutoff. Because the Bore
seal plug seal is formed from metal (N07718 nickel
alloy) rather than an elastomer, a valve equipped
with the Bore 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
Specifications for the EHD and EHT valves are
shown in table 1.
2
Instruction Manual
April 2009
Table 3. Additional Shutoff Classification
VALVE DESIGN
(PRESSURE RATING)
EHD
(CL500)
EHD
(CL2500)
VALVE
SIZE,
NPS
8 1400 3100 1700 3700 1900 4100 2200 4700
10 1500 3300 1900 4100 2000 4400 - - - - - -
12 3400 7300 3900 8600 3400 7600 - - - - - -
14 3400 7300 - - - - - - 3400 7600 - - - - - -
VALVE SIZE, NPS
8
10
8
10
12
14
Table 4. Approximate Weights (Valve Body and Bonnet Assemblies)
Buttwelding Ends Flanged Buttwelding Ends Flanged
Kilograms Pounds Kilograms Pounds Kilograms Pounds Kilograms Pounds
PORT DIAMETER,
INCHES
7
5.375
7
CL1500 CL2500
EH Valves (NPS 8 through 14)
CAGE STYLE
Equal Percentage
Modified Equal Percentage
Linear (std. cage)
Linear (Whisper III, A1, B3, C3)
Equal Percentage, Modified Equal Percentage,
Linear (std. cage),
Linear (Whisper III, A1, B3, C3, D3)
Equal Percentage, Modified Equal Percentage,
Linear (std. cage),
Linear (Whisper III, A1, B3, C3, D3)
WEIGHTS
ANSI/FCI LEAKAGE
optional Bore seal trim
optional Bore seal trim)
optional Bore seal trim)
CLASS
V with
V with
V with
Installation
WARNING
Always wear protective gloves,
clothing, and eyewear when
performing any installation operations
to avoid personal injury.
To avoid personal injury or property
damage resulting from the sudden
release of pressure, do not install the
valve assembly where service
conditions could exceed the limits
given in this manual or on the
appropriate nameplates. Use
pressure-relieving devices 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
The valve configuration and
construction materials were selected
to meet particular pressure,
temperature, pressure drop, and
controlled fluid conditions. Because
some body/trim material combinations
are limited in their pressure drop and
temperature range capabilities, do not
apply any other conditions to the valve
without first contacting your Emerson
Process Management sales office.
If hoisting the valve, use a nylon sling
to protect the painted surfaces.
Carefully position the sling to prevent
damage to the actuator tubing or any
accessories. Also, take precautions to
prevent personnel from being injured
in case the hoist or rigging slips
unexpectedly. Refer to table 4 for valve
assembly weights and the appropriate
actuator instruction manual for
actuator assembly weights. Be sure to
use adequately sized hoists and
chains or slings to handle the valve
and actuator assembly.
1. Before installing the valve, inspect it to ensure
that the valve body cavity is free of foreign material.
3
Instruction Manual
EH Valves (NPS 8 through 14)
2. Clean out all pipelines to remove scale, welding
slag, and other foreign materials before installing the
valve.
Note
If installing a valve with small internal
flow passages, such as with Whisper
Trim III or Cavitrolr III cages, consider
installing an upstream strainer to
prevent the lodging of particles in
these passages. This is especially
important if the pipeline cannot be
thoroughly cleaned or if the flowing
medium is not clean.
3. Install the control valve with the valve body in a
horizontal pipeline and the actuator vertical above
the valve. Other orientations may result in shortened
trim life and difficulty with field maintenance. Flow
through the valve body must be in the direction
indicated by the flow arrow (key 15, figure 12 or 13)
on the valve body.
CAUTION
Depending on valve body materials
used, post-weld heat treating might be
needed. Post-weld heat treatment can
damage internal elastomeric, plastic,
and metal parts. Shrink-fit pieces and
threaded connections might also
loosen. In general, if post-weld heat
treating is needed, remove all trim
parts. Contact your Emerson Process
Management sales office for additional
information.
4. Use accepted piping and welding practices when
installing the valve in the line. For flanged valve
bodies, use suitable gaskets between the valve body
flanges and pipeline flanges.
5. Install a three-valve bypass around the control
valve if continuous operation is required during
maintenance.
6. If the actuator and valve are shipped separately,
see the Actuator Mounting procedure.
WARNING
Personal injury could result from
packing leakage. Valve packing was
tightened prior to shipment; however
April 2009
some readjustment will be required to
meet specific service conditions.
7. If the valve was shipped without packing installed
in the packing box, install the packing prior to putting
the valve into service. Refer to instructions given in
the Packing Maintenance section of this manual.
Principle of Operation
Key numbers referenced in this section are shown in
figure 12 for the EHD valve and in figure 13 for the
EHT valve.
EHD and EHT valves are balanced designs. When
they are opening or closing, pressure registers on
top of the valve plug (key 3) through the registration
holes in the plug. The force of the pressure on top of
the plug balances the force of the pressure on the
bottom of the plug to reduce the actuator force
required.
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 and maintenance,
trim maintenance, and lapping of metal seats. All
maintenance operations can be performed with the
valve in the line.
WARNING
Avoid personal injury from sudden
release of process pressure. 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 on both sides of the
4
Instruction Manual
April 2009
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, 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.
WARNING
Refer to table 4 for valve assembly
weights and the appropriate actuator
instruction manual for actuator
assembly weights. Due to the size and
weight of the valve and actuator
assembly, be sure adequately sized
hoists and chains or slings are used to
handle it. Also, take proper
precautions to prevent personnel from
being injured if the hoist or rigging
slips unexpectedly.
Note
Whenever a gasket seal is disturbed
by removing or shifting gasketed
parts, install a new gasket upon
reassembly. This is necessary to
ensure a good gasket seal.
8. After all maintenance is complete, refer to the
Trim Replacement procedure to assemble the valve
body.
Note
If the valve has ENVIRO-SEALr
live-loaded packing installed, see the
Fisher instruction manual titled
ENVIRO-SEAL Packing System for
EH Valves (NPS 8 through 14)
14
LUBRICATOR
14
27
10A9421-A
AJ5428-D
A0832-2/IL
Figure 2. Lubricator and Lubricator/Isolating Valve
Sliding-Stem Valves for packing
instructions.
If the valve has HIGH-SEAL live-loaded
packing installed, see the Fisher
instruction manual titled HIGH-SEAL
Live-Loaded Packing System for
instructions.
Packing Lubrication
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).
ENVIRO-SEAL or HIGH-SEAL packing
does not require lubrication.
A lubricator or lubricator/isolating valve (figure 2) is
recommended for PTFE-impregnated composition
packing. The lubricator or lubricator/isolating valve is
installed in place of the pipe plug in the bonnet. Use
a good quality silicon-base lubricant. Do not lubricate
packing used in oxygen service or in processes with
temperatures over 260_C (500_F). To operate the
lubricator, turn the cap screw clockwise to force
lubricant into the packing box. The
LUBRICATOR/ISOLATING VALVE
WARNING
Note
5
Instruction Manual
EH Valves (NPS 8 through 14)
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
WARNING
Personal injury could result from
packing leakage. Valve packing was
tightened before shipment; however,
the packing might require
readjustment to meet specific service
conditions.
April 2009
Table 5. Recommended Packing Flange Nut Torques
STEM
DIAMETER
mm Inches Min Max Min Max
31.8 1-1/4
50.8 2
VALVE
RATING
CL1500 68 102 50 75
CL2500 81 122 60 90
CL1500 98 146 72 108
CL2500 115 170 85 125
NSm LbfSft
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 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.
While replacing the packing according to the
Replacing Packing procedure, inspect the stem and
packing box wall for nicks or scratches.
Replacing Packing
Valves with ENVIRO-SEAL live-loaded packing or
HIGH-SEAL live-loaded packing installed probably
will not require this initial re-adjustment. See the
Fisher instruction manuals titled ENVIRO-SEAL
Packing System for Sliding-Stem Valves or
HIGH-SEAL Live-Loaded Packing System (as
appropriate) for packing instructions. To convert an
existing packing arrangement to ENVIRO-SEAL
packing, refer to the retrofit kits listed in the parts kit
sub-section near the end of this manual. Figure 10
shows typical ENVIRO-SEAL packing systems.
For spring-loaded PTFE V-ring packing (figure 4),
the spring maintains a sealing force on the packing.
If leakage is noted around the packing follower
(key 13, figure 11), check to be sure the shoulder on
the packing follower is touching the bonnet (key 1,
figure 11). If the shoulder is not touching the bonnet,
tighten the packing flange nuts (key 5, figure 11)
until the shoulder on the packing follower is against
the bonnet. If the packing leakage is still excessive,
replace the packing by following the Replacing
Packing procedure.
If packing leakage is undesirable with other than
spring-loaded PTFE V-ring packing, first try to limit
the leakage and establish a stem seal by tightening
the packing flange nuts (key 5, figure 11) to at least
the minimum recommended torque in table 5.
However, do not exceed the maximum
recommended torque in table 5 or excessive friction
may result.
WARNING
Refer to the WARNING at the
beginning of the Maintenance section
in this instruction manual.
Key numbers referred to in this procedure are shown
in figure 11 unless otherwise indicated.
1. Remove the stem connector cap screws shown in
figure 3, and separate the two halves of the stem
connector. Then exhaust all actuator pressure, if any
was applied, and disconnect the actuator supply and
any leakoff piping.
2. Remove the hex nuts (key 26) and remove the
actuator from the bonnet (key 1). Loosen the
packing flange nuts (key 5) so that the packing
(key 6, or 7 and 9, figure 4) is not tight on the valve
plug stem (key 4, figure 12 or 13). Remove any
travel indicator disk and stem locknuts from the
valve plug stem threads.
WARNING
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. To avoid
6
Instruction Manual
April 2009
personal injury or property damage
caused by uncontrolled movement of
the bonnet, loosen the bonnet by
following the instructions in the next
step.
Note
The following step also provides
additional assurance that the valve
fluid pressure has been relieved.
3. Hex nuts (key 14, figures 12 and 13) attach the
bonnet to the valve body. Loosen these nuts
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 body.
Work the prying tool around the bonnet until the
bonnet loosens. If no fluid leaks from the joint, proceed
with the bonnet removal in step 5.
WARNING
EH Valves (NPS 8 through 14)
ANTI-ROTATION GROOVE
STEM
CONNECTOR
CAP SCREWS
15A4691-A
A2359-2 / IL
Figure 3. Actuator Mounting
TRAVEL INDICATOR
STEM CONNECTOR
POINTER
STEM LOCKNUTS
MOUNTING STUDS & NUTS
If the cage sticks to the bonnet,
proceed carefully with bonnet removal
until the cage windows are accessible.
Do not extend hands or arms through
the windows at this point as a sudden
separation of bonnet and cage will
cause personal injury. Use a stick or
other device to thread a rope or sling
through the windows. Use this rigging
to secure the cage to the bonnet or
hoist to prevent damage or injury
should the cage suddenly separate
from the bonnet.
CAUTION
When lifting the bonnet (key 1), be
sure that the valve plug and stem
assembly (keys 3 and 4, figure 12
or 13) remains on the seat ring (key 6,
figure 12 or 13). This avoids damage to
the seating surfaces as a result of the
assembly dropping from the bonnet
after being lifted part way out. The
parts are also easier to handle
separately.
4. Remove the hex nuts (key 14, figure 12 or 13)
and washers (key 29, figure 12 or 13). Carefully lift
the bonnet off the valve plug stem. If the valve plug
assembly starts to lift with the bonnet, use a brass or
similar hammer to tap the end of the stem and tap it
back down. Set the bonnet on a protective surface to
prevent damage to the bonnet gasket surface.
CAUTION
Use care to avoid damaging gasket
sealing surfaces.
EHD piston rings (key 8) are brittle and
in two pieces. Use care to avoid
damage to the piston rings caused by
dropping or rough handling.
5. Lift the plug assembly (keys 3 and 4, figure 12
or 13) out of the valve body.
6. To remove the cage (key 2, figure 12 or 13), if it
remained in the valve body, install eyebolts or similar
devices into the 1/2 inch 13-UNC tapped holes in the
top of the cage. Using the eyebolts, carefully lift the
cage out of the valve body. Remove the top and
bottom cage gaskets (key 11, figure 12 or 13).
Carefully remove any residual silver or tin from the
gasket surfaces.
7. Cover the opening in the valve body to protect
the gasket surface and to prevent foreign material
from getting into the valve body cavity.
7
Instruction Manual
EH Valves (NPS 8 through 14)
UPPER WIPER (KEY 12)
PACKING FOLLOWER
(KEY 13)
FEMALE ADAPTOR
12A8160-A / IL
PTFE V‐RING
SINGLE PACKING
(KEY 32)
V-RING (KEY 7)
MALE ADAPTOR
(KEY 31)
WASHER (KEY 10)
SPRING (KEY 8)
PACKING BOX RING
(KEY 11)
LOWER WIPER
(KEY 30)
UPPER WIPER (KEY 12)
PACKING FOLLOWER
(KEY 13)
FEMALE ADAPTOR
(KEY 32)
V-RING (KEY 7)
MALE ADAPTOR
(KEY 31)
LANTERN RING
(KEY 8)
KEY 6
1
14A3412-B / IL
GRAPHITE LAMINATE AND FILAMENT
SINGLE PACKING
KEY 6
1
PACKING FOLLOWER
(KEY 13)
GRAPHITE LAMINATE
PACKING RING (KEY 7)
2
GRAPHITE FILAMENT
PACKING RING (KEY 9)
3
LANTERN RING
(KEY 8)
PACKING BOX RING
(KEY 11)
13A0112-A / IL
PACKING FOLLOWER
(KEY 13)
GRAPHITE LAMINATE
PACKING RING (KEY 7)
2
GRAPHITE FILAMENT
PACKING RING (KEY 9)
3
LANTERN RING
(KEY 8)
GRAPHITE/COMPOSITION
DOUBLE PACKING
April 2009
UPPER WIPER (KEY 12)
PACKING FOLLOWER
(KEY 13)
PACKING RING
(KEY 7)
PACKING RING
(KEY 7)
LANTERN RING
(KEY 8)
PACKING BOX RING
(KEY 11)
UPPER WIPER (KEY 12)
PACKING FOLLOWER
(KEY 13)
PACKING RING
(KEY 7)
LANTERN RING
(KEY 8)
PACKING BOX RING
12A7839-A / IL
Sht 1
DOUBLE PACKING
PTFE V‐RING
(KEY 11)
LOWER WIPER
(KEY 30)
PACKING ARRANGEMENTS FOR 31.8 mm (1‐1/4 INCH) VALVE STEMS
PACKING
FOLLOWER
(KEY 13)
GRAPHITE
LAMINATE
PACKING RING
(KEY 7)
1
14A3419-B / IL
GRAPHITE LAMINATE AND FILAMENT
SINGLE PACKING
NOTES:
1
0.102 mm (0.004 INCH) THICK SACRIFICIAL ZINC WASHERS.
USE ONLY ONE BELOW EACH GRAPHITE LAMINATE RING.
C0634-1 / IL
2
GRAPHITE
FILAMENT
PACKING RING
(KEY 9)
3
LANTERN RING
(KEY 8)
PACKING
BOX RING
(KEY 11)
PACKING ARRANGEMENTS FOR 50.8 mm (2‐INCH) VALVE STEMS
1
14A3414-B / IL
PACKING BOX RING
(KEY 11)
GRAPHITE LAMINATE AND FILAMENT
DOUBLE PACKING
1
1
14A3418-A / IL
GRAPHITE LAMINATE AND FILAMENT
DOUBLE PACKING
2
HAS THE APPEARANCE OF FLAT WASHERS PRESSED TOGETHER.
3
HAS THE APPEARANCE OF A WOVEN OR BRAIDED RING.
Figure 4. Packing Arrangements
12A8163-A / IL
PACKING
FOLLOWER
(KEY 13)
GRAPHITE
LAMINATE
PACKING RING
(KEY 7)
2
GRAPHITE
FILAMENT
PACKING RING
3
(KEY 9)
LANTERN RING
(KEY 8)
PACKING
BOX RING
(KEY 11)
13A0029-A / IL
GRAPHITE/COMPOSITION AND PTFE/
PACKING BOX RING
(KEY 11)
PTFE/COMPOSITION
DOUBLE PACKING
COMPOSITION DOUBLE PACKING
UPPER WIPER (KEY 12)
PACKING FOLLOWER
(KEY 13)
PACKING RING
(KEY 7)
LANTERN RING
(KEY 8)
PACKING BOX RING
(KEY 11)
8
Instruction Manual
April 2009
Table 6. Body-to-Bonnet Bolting Torques
VALVE
SIZE
NPS
8, 10
12, 14
VALVE
RATING
CL1500 2710 2000 2035 1500
CL2500 4070 3000 3050 2250
CL1500 8130 6000 6100 4500
CL2500 5830 4300 4370 3225
B7, B16, BD, 660
STUDS
NSm lbfSft NSm lbfSft
B8, B8M STUDS
8. Remove the packing flange nuts, packing flange,
upper wiper and packing follower. 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 these metal packing parts shown in the
figure 4 arrangements: packing box ring, spring,
lantern ring, washer if used, and packing follower
(keys 11, 8, 10, and 13).
9. Inspect the valve plug stem threads for any sharp
edges that might cut the packing. Use a whetstone
or emery cloth to smooth the threads if necessary.
10. Remove the protective covering from the valve
body cavity, and install the cage using new cage
gaskets (key 11, figure 12 or 13).
11. Install the plug and stem assembly. Be sure the
seal ring or piston rings are installed correctly as
described under Trim Replacement.
12. Slide the bonnet over the stem and onto the
bonnet studs (key 13, figure 12 or 13).
Note
EH Valves (NPS 8 through 14)
CAUTION
Failure to comply with good
bonnet-to-body bolting practices and
the torque values shown in table 6 may
result in cage crushing, cage diameter
reduction, and/or bonnet deformation.
Do not use cheater bars or slug
wrenches for this procedure.
Hot torquing is not recommended; it
may result in damage to valve
components.
13. Lubricate the stud threads and the faces of the
hex nuts (key 14, figure 12 or 13) with anti-seize
lubricant (not necessary if new factory prelubricated
hex nuts are used). Replace the washers and hex
nuts but do not tighten them. Torque the nuts in a
crisscross pattern to no more than 1/4 of the nominal
torque value specified in table 6. When all nuts are
tightened to that torque value, increase the torque
by 1/4 of the specified nominal torque and repeat the
crisscross pattern. Repeat this procedure until all
nuts are tightened to the specified nominal value.
Apply the final torque value again and, if any nut still
turns, tighten every nut again.
14. Install new packing and the metal packing box
parts according to the appropriate arrangement in
figure 4. Slip a smooth-edged pipe over the valve
stem, and gently tamp each soft packing part into
the packing box.
15. Slide the packing follower, wiper, and packing
flange into position. Lubricate the packing flange
studs (key 4) and the faces of the packing flange
nuts (key 5) and then install the packing flange nuts.
Proper performance of the bolting
procedures in step 14 compresses the
cage gaskets (key 11, figure 12 or 13)
enough to seal the body-to-bonnet
joint.
The prelubricated hex nuts (key 14,
figure 12 or 13) referred to in step 14
can be identified by a black film
coating on the nut threads.
The proper bolting procedures in step
14 include, but are not limited to,
ensuring that the bonnet stud threads
are clean, and that the hex nuts are
evenly tightened to the specified
torque values.
For spring-loaded PTFE V-ring packing: Tighten
the packing flange nuts until the shoulder on the
packing follower (key 13) contacts the bonnet
(key 1).
For other kinds of packing, except ENVIRO-SEAL
and HIGH-SEAL: Tighten the packing flange nuts to
the maximum recommended torque shown in
table 5. Then, loosen the packing flange nuts and
retighten them to the recommended minimum torque
in table 5.
For ENVIRO-SEAL and HIGH-SEAL packing: See
the Fisher instruction manuals titled ENVIRO-SEAL
Packing System for Sliding-Stem Valves or
HIGH-SEAL Live-Loaded Packing System (as
appropriate) for packing instructions.
9
Instruction Manual
EH Valves (NPS 8 through 14)
Table 7. Seat Ring and Seat Ring Cap Screw Lubricants and Recommended Torque for Seat Ring Cap Screws
LUBRICANT
Lithium Grease or
Anti-Seize
Lubricant
Dry Film
Lubricant
VALVE
SIZE,
NPS
8, 10
12, 14
8, 10
12, 14
16. Mount the actuator on the valve body assembly,
and reconnect the actuator and valve plug stem
according to the Actuator Mounting procedure. After
the control valve is returned to service, retighten the
hex nuts (key 14, figure 12 or 13) to the torque
recommended in table 6.
Trim Removal
WARNING
Refer to the WARNING at the
beginning of the Maintenance section
in this instruction manual.
For Bore seal construction, see the appropriate Bore
seal sections in this instruction manual.
Key numbers referenced in this procedure are
shown in figure 12 for the EHD valve and figure 13
for the EHT valve except where indicated.
1. Remove the actuator and bonnet by following
steps 1 through 9 of the Replacing Packing
procedure.
2. To remove the seat ring (key 6), remove the cap
screws (key 7). Install eyebolts or similar devices in
the 5/8 inch 11-UNC tapped holes (9/16 inch
12-UNC for an NPS 8 or 10 CL1500 valve). Use the
eyebolts to carefully lift the seat ring out of the valve
body. If the seat ring is to be reused, exercise care
to protect the gasket surfaces on the bottom of the
seat ring.
3. Remove the spiral wound seat ring gasket or
O-ring (key 12).
4. Refer to the following appropriate valve plug
maintenance procedure or to the Lapping Seats
procedure.
VALVE
RATING
CL1500 61 45 41 30
CL2500 95 70 61 45
CL1500 95 70 61 45
CL2500 95 70 61 45
CL1500 47 35 34 25
CL2500 75 55 47 35
CL1500 75 55 47 35
CL2500 75 55 47 35
April 2009
RECOMMENDED TORQUE
Spiral Wound
Gasket Construction
NSm lbfSft NSm lbfSft
O-Ring Construction or
Constructions for
Sour Gas Service
EHD and EHT Valve Plug Maintenance
Key numbers used in this procedure are shown in
figure 12 for the EHD valve and in figure 13 for the
EHT valve.
1. With the valve plug (key 3) removed per the Trim
Removal procedure, proceed as appropriate:
For the EHD valve, the piston rings (key 8) are each
in two sections; remove the sections from the
grooves in the valve plug.
For all EHT valves, work the retaining ring (key 10)
off the valve plug with a screwdriver. Carefully slide
the backup ring and seal ring (keys 9 and 8) off the
valve plug. Additionally, for the EHT valve with
Whisper Trim Level D cage, remove the two sections
of the piston ring (key 30, figure 13).
2. To replace the valve plug stem (key 4), drive out
the pin (key 5) and unscrew the stem from the valve
plug (key 3).
CAUTION
Never reuse an old stem with a new
valve plug. Using an old stem with a
new plug requires drilling a new pin
hole in the stem. This weakens the
stem and may cause the stem to fail in
service. If a new valve plug is required,
always order a valve plug, stem, and
pin as an assembly. Specify the
correct part number of each of the
three parts but state that the parts are
being ordered as an assembly.
A used valve plug may be reused with
a new stem.
3. Thread the new stem into the valve plug until the
stem wedges tightly at the end of the thread. Using
10
Instruction Manual
April 2009
the valve plug pin hole as a guide, drill the pin hole
through the stem. Use a 1/4 inch drill for 31.8 mm
(1-1/4 inch) stems and a 3/8 inch drill for 50.8 mm
(2-inch) stems.
4. Drive in the pin to lock the assembly.
5. If seat lapping is necessary, complete the
Lapping Seats procedure before installing the EHD
piston rings or the EHT seal ring. Piston ring and
seal ring installation instructions and valve
body-to-bonnet reassembly instructions are
presented in the Trim Replacement procedure.
Lapping Seats
Key numbers referenced in this procedure are
shown in figure 12 for the EHD valve and in figure 13
for the EHT valve.
A certain amount of leakage should be expected
with metal-to-metal seating in any valve. If the
leakage becomes excessive, however, the condition
of the seating surfaces of the valve plug (key 3) and
seat ring (key 6) can be improved by lapping. (Deep
nicks should be machined out rather than ground
out.) Use a good quality lapping compound with a
mixture that contains 280 to 600 grit. Apply the
compound to the bottom of the valve plug.
Use the following procedure to lap the seating
surfaces.
1. For all designs, install the seat ring gasket or
O-ring (key 12), seat ring (key 6), seat ring cap
screws (key 7), lower cage gasket (key 12), cage
(key 2), and upper cage gasket (key 12) into the
valve body per the instructions in the Trim
Replacement procedure.
2. Install the assembled valve plug and stem
(keys 3 and 4)--without piston rings or seal ring
(key 8)-- into the cage.
3. For all seating surfaces, install the bonnet (key 1,
figure 11) over the valve stem and secure the bonnet
with four of the hex nuts (key 14).
4. Attach a handle, such as a piece of strap iron
secured by stem locknuts, to the valve plug stem.
Rotate the handle alternately in each direction to lap
the seats.
Note
In order to preserve the effects of
lapping, do not change either the
position of the seat ring in the valve
body cavity or the position of the cage
on the seat ring after lapping the
seating surfaces. If possible, clean the
EH Valves (NPS 8 through 14)
parts without disturbing their
positions. If the parts must be
removed for cleaning, return them to
the original positions.
5. After lapping, again disassemble as necessary,
clean the seating surfaces, reassemble, and test for
shutoff. Repeat the lapping procedure if necessary.
Trim Replacement
After all trim maintenance has been completed,
reassemble the valve by following the numbered
steps below. Be certain that all gasketed surfaces
are clean. Key numbers referenced in this procedure
are shown in figure 12 for the EHD valve and in
figure 13 for the EHT valve.
CAUTION
Thoroughly clean the seat ring (key 6),
the seat ring cap screws (key 7), and
the cap screw threads in the valve
body with a good-quality degreaser.
Unless the valve is to be used for
oxygen service, thoroughly lubricate
the cap screw threads and the
underside of the cap screw heads with
one of the lubricants (or equivalent)
shown in table 7.
Failure to lubricate as described may
cause galling and improper seat ring
gasket or O-ring (key 12) loading
which may result in leakage.
WARNING
If the control valve is to be used for
oxygen service, use the lubrication
procedure above, but substitute a
lubricant that has been approved for
oxygen service. Use of unapproved
lubricants creates a fire or explosion
hazard.
1. Install either the seat ring gasket or the O-ring
(key 12). Place the O-ring in the O-ring groove in the
seat ring before installing the seat ring in the valve
body. Install the seat ring (key 6) and secure it with
the seat ring cap screws (key 7). Torque the hex
socket head cap screws in a criss-cross pattern with
no more than 20 NSm (15 lbfSft) of torque. When all
are tightened to 20 NSm (15 lbfSft), increase the
torque 20 NSm (15 lbfSft) without exceeding the
torque value specified in table 7, and repeat the
11
Instruction Manual
EH Valves (NPS 8 through 14)
crisscross pattern. Repeat until all cap screws are
tightened to the torque value specified in table 7.
Repeat the final torque and if any cap screw still
turns, tighten every cap screw again.
2. Install one of the cage gaskets (key 11) between
the valve body and cage (key 2), and install the
cage.
3. If the cage used has multiple sizes of windows,
attempt to orient the largest window toward the valve
body web (a shelf-like projection of the casting into
the flow cavity). As an alternate reference, orient the
largest window toward the process outlet for a
flow-down and toward the process inlet for a flow-up
valve.
4. Inspect the valve plug stem threads for any sharp
edges that might cut the packing. Use a whetstone
or emery cloth to smooth the threads if necessary.
5. To install the piston rings or seal ring (key 8),
proceed as appropriate:
For an EHD valve, if installing a new piston ring, the
replacement piston ring will arrive in one piece. Use
a vise with smooth or taped jaws to break this
replacement piston ring into halves. Place the new
ring in the vise so that the jaws compress the ring
into an oval. Slowly compress the ring until the ring
snaps on both sides. If one side snaps first, do not
try to tear or cut the other side. Instead, keep
compressing until the other side snaps.
Remove any protective tape or covering from the
valve plug and stem assembly, and set it on a
protective surface. Then place the piston ring in the
piston ring groove with the fractured ends matched.
For an EHT valve, install the seal ring (key 8) onto
the valve plug (key 3). Install the ring with the open
side facing the seat ring end of the valve plug for a
flow-down application (view B of figure 13) or with
the open side facing the valve stem end of the valve
plug for a flow-up application. Slide the backup ring
(key 9) onto the valve plug. Secure with the retaining
ring (key 10). For an EHT valve with a Whisper Trim
Level D cage, install the piston ring (key 30,
figure 13) using the procedure given in the EHD
instructions immediately preceding this paragraph.
6. Install the valve plug into the cage.
7. Install the other cage gasket (key 11) between
the cage and the bonnet.
CAUTION
Failure to comply with good
bonnet-to-body bolting practices and
April 2009
the torque values shown in table 6 may
result in cage crushing, cage diameter
reduction, and/or bonnet deformation.
Cheater bars or slug wrenches should
not be used for this procedure.
Hot torquing is not recommended; it
may result in damage to valve
components.
8. Install the bonnet over the valve stem and onto
the valve body. Lubricate the threads of the studs
(key 13) and the faces of the hex nuts (key 14) with
anti-seize lubricant (key 24). Secure the bonnet with
hex nuts (key 14) and washers (key 29). Torque the
nuts in a crisscross pattern to no more than 1/4 of
the nominal torque value specified in table 6. When
all nuts are tightened to that torque value, increase
the torque by 1/4 of the specified torque value and
repeat the crisscross pattern. Repeat this procedure
until all nuts are tightened to the specified nominal
value. Repeat the final torque value and if any nut
still turns, tighten every nut again.
9. Install new packing and the metal packing box
parts according to the appropriate arrangement in
figure 4. Slip a smooth-edged pipe over the valve
stem, and gently tamp each soft packing part into
the packing box.
10. Slide the packing follower, wiper, and packing
flange into position. Lubricate the packing flange
studs (key 4) and the faces of the packing flange
nuts (key 5) and then install the packing flange nuts.
For spring-loaded PTFE V-ring packing: Tighten
the packing flange nuts until the shoulder on the
packing follower (key 13) contacts the bonnet
(key 1).
For other kinds of packing, except ENVIRO-SEAL
and HIGH-SEAL: Tighten the packing flange nuts to
the maximum recommended torque shown in
table 5. Then, loosen the packing flange nuts and
retighten them to the recommended minimum torque
in table 5.
For ENVIRO-SEAL and HIGH-SEAL packing: See
the Fisher instruction manuals titled ENVIRO-SEAL
Packing System for Sliding-Stem Valves or
HIGH-SEAL Live-Loaded Packing System (as
appropriate) for packing instructions.
11. Mount the actuator by following the Actuator
Mounting procedure. Check for packing leakage as
the valve is being put into service. Retorque the
packing flange nuts as required (see table 5). Then,
retighten the hex nuts (key 14) to the torque shown
in table 6.
12
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