Emerson Fisher EHD, Fisher EHS, Fisher EHT Instruction Manual
Instruction Manual
D100394X012
Fisher™ EHD, EHS, and EHT Valves
NPS 1-1/2x1 through NPS 8x6
EH (1-1/2x1 through 8x6)
July 2017
Contents
Introduction 1.................................
Scope of Manual 1.............................
Description 2.................................
Specifications 3...............................
Educational Services 3.........................
Installation 4..................................
Maintenance 6.................................
Packing Lubrication 7..........................
Packing Maintenance 7.........................
Replacing Packing 8........................
Trim Removal 12..............................
Valve Plug Maintenance 14.....................
Lapping Seats 15..............................
Trim Replacement 16..........................
Retrofit: Installing C‐seal Trim 21................
Replacement of Installed C‐seal Trim 24...........
Trim Removal (C‐seal Constructions) 24.......
Lapping Metal Seats (C‐seal Constructions) 26..
Remachining Metal Seats
(C‐seal Constructions) 26.................
Trim Replacement (C‐seal Constructions) 26...
Parts Ordering 28...............................
Parts Kits 28...................................
Parts List 29...................................
Figure 1. Fisher EH Valve with 657 Actuator
W3387
Introduction
Scope of Manual
This instruction manual includes installation, maintenance, and parts information for the Fisher EHD, EHS, and EHT
control valves in NPS 1-1/2 x 1 through NPS 8x6. Refer to separate manuals for instructions covering the actuator,
positioner, ENVIRO‐SEAL
Do not install, operate, or maintain EHD, EHS, or EHT 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
proceeding.
Unless otherwise noted, all NACE references are to NACE MR0175‐2002.
www.Fisher.com
™
packing, HIGH‐SEAL packing, and accessories.
or Local Business Partner before
EH (1-1/2x1 through 8x6)
July 2017
Table 1. Specifications
Instruction Manual
D100394X012
End Connection Styles
Buttwelding: All available ASME B16.25 schedules
that are compatible with ASME B16.34
pressure/temperature ratings
Flow Characteristic
Standard Cage: J Equal percentage, J modified
equal percentage
Cavitrol
™
III or Whisper Trim™ III Cage: Linear
Flanged: CL2500 J ring‐type joint (RTJ) or
J raised‐face (RF) flanges according to ASME B16.5
Socket Welding: Consistent with ASME B16.11
Flow Direction
EHD or EHT: Flow down, except with either a Whisper
Maximum Inlet Pressure
(1)
Buttwelding: Consistent with CL2500
pressure‐temperature ratings per ASME B16.34
Trim III cage or a valve plug with diverter cone, both
of which are flow up
EHS: Flow up, except flow down with Cavitrol III cage
Flanged: Consistent with CL2500
pressure‐temperature ratings per ASME B16.34
Socket Welding: Consistent with CL2500
pressure‐temperature ratings per ASME B16.34
Approximate Weights (Valve Body and Bonnet
Assemblies)
See table 6
Shutoff Classifications
See table 2
C‐seal trim: High‐temperature, Class V.
See table 3
TSO (Tight Shutoff) trim: See tables 4 and 5
1. The pressure or temperature limits in this manual and any applicable standard limitations should not be exceeded.
2. Modified equal percentage characteristic is equal‐percentage for the first 90% of travel, then quick‐opening for additional capacity.
Additional Specifications
For specifications such as materials, valve plug
travels, and port, yoke boss, and stem diameters, see
the Parts List section
Table 2. Shutoff Classifications per ANSI/FCI 70‐2 and IEC 60534‐4
Valve
EHD
EHS w/Cavitrol III, or
EHT w/Cavitrol III
EHS, EHT,
EHS w/Micro‐Form or
EHS w/Micro Flute
EHT w/ PEEK Anti‐Extrusion
Rings
1. O‐ring seat ring construction recommended for this shutoff classification; for temperatures below 232_C (450_F) only.
Valve Size,
NPS
3x2 II
3, 4x3,
4, 6x4
6, 8x6
All V
All
3 to 6 V to 600_F (316_C)
ANSI/FCI Leakage Class
II—Standard
III—Optional
III—Standard
IV—Optional
IV—Standard
V—Optional
(1)
(2)
, J or linear
(1)
(1)
(1)
Description
The EHD, EHS, and EHT high‐pressure globe valves (figure 1) have metal seats, cage guiding, and push‐down‐to‐close
valve plug action. The EHD and EHT valves use balanced valve plugs.
The EHS valve uses an unbalanced valve plug. To provide a seal between the cage and a balanced valve plug, the EHD
valve plug uses piston rings; the EHT valve plug uses a pressure‐assisted seal ring. A Whisper Trim cage can be used
with an EHD, EHS, or EHT valve plug. A Cavitrol III cage can be used with an EHS or EHT valve plug.
C‐seal trim is available for EHD valves, CL2500, in sizes 4, 6, 6x4, and 8x6.
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
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Instruction Manual
D100394X012
EH (1-1/2x1 through 8x6)
applied in processes with a fluid temperature of up to 593_C (1100_F), provided other material limits are not
exceeded. Contact your Emerson sales office
or Local Business Partner for information.
Specifications
Specifications for the EHD, EHS, and EHT valves are shown in table 1.
Educational Services
For information on available courses for the Fisher EH valve, 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: education@emerson.com
emerson.com/fishervalvetraining
Table 3. Additional Shutoff Classification per ANSI/FCI 70‐2 and IEC 60534‐4
Valve (Class) Valve Size, NPS Port Diameter, Inches Cage Style
EHD
(CL2500)
6x4
8x6
8x6
Equal Percentage, Modified Equal Percentage,
4
6
6
2.875
Equal Percentage, Modified Equal Percentage,
4.375
4.375 Linear (Cavitrol III, 2‐ and 3‐stage)
Linear (std. cage),
Linear (Whisper III, A1, B3, C3)
Linear (Cavitrol III, 2‐stage)
Linear (std. cage),
Linear (Whisper III, A1, B3, C3, D3)
ANSI/FCI Leakage
V (for port
diameters from 2.875
through 7‐inch with
optional C‐seal trim)
July 2017
Class
Table 4. TSO (Tight Shutoff) Leakage Class per ANSI/FCI 70‐2 and IEC 60534‐4
Leakage Class Maximum Leakage Test Medium Test Pressure ANSI/FCI Leakage Class
Valves with TSO trim are factory tested to
TSO (Tight Shutoff)
1. Specify service ΔP when ordering.
a more stringent Emerson Automation
Solutions test requirement of no leakage
Water Service ΔP
at time of shipment.
(1)
V
Table 5. TSO Shutoff Availability
VALVE CONSTRUCTION
EHS, EHT Cavitrol III trim. Replaceable, protected soft seat TSO ‐ ‐ ‐
LEAKAGE CLASS
Standard Optional
Table 6. Approximate Weights (Valve Body and Bonnet Assemblies)
CL2500
VALVE
SIZE,
NPS
1-1/2 x 1 ‐ ‐ ‐ 46 ‐ ‐ ‐ 101
2x1 78 47 173 104
3x2 161 94 355 207
3 223 163 492 359
4x3 265 162 585 357
4 338 243 745 536
6x4 526 257 1160 567
6 785 544 1731 1199
8x6 955 558 2106 1231
Flg
Kilograms Pounds
SWE
&
BWE
Flg
SWE
&
BWE
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EH (1-1/2x1 through 8x6)
July 2017
Instruction Manual
D100394X012
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
Responsibility for the safety of process media and compatibility of valve materials with process media rests solely with the
purchaser and end‐user. The valve configuration and construction materials meet particular pressure, temperature,
pressure drop, and controlled fluid conditions specified in the customer's order. Because some body/trim material
combinations are limited in their pressure drop and temperature range capabilities (especially due to differences in
thermal expansion rates), do not apply any other conditions to the valve without first contacting your Emerson sales office
or Local Business Partner.
CAUTION
If hoisting the valve, use a nylon sling to protect the painted surfaces. Carefully position the sling to prevent damage to the
tubing or any accessories. Use adequately sized hoists and chains or slings to handle the valve and take precautions to
prevent personnel from being injured in case the hoist or rigging slips unexpectedly. Refer to table 6 for valve assembly
weights.
WARNING
Personal injury could result from packing leakage. Valve packing was tightened prior to shipment; however some
readjustment will be required 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.
1. Before installing the valve, inspect it to ensure that the valve body cavity is free of foreign material.
2. Clean out all pipelines to remove scale, welding slag, and other foreign materials before installing the valve.
Note
If the valve being installed has small internal flow passages, such as with Whisper Trim III or Cavitrol III cages, consideration should
be given to 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.
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Instruction Manual
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EH (1-1/2x1 through 8x6)
3. The control valve must be installed with the actuator vertical above the valve body for proper operation. Flow
through the valve must be in the direction indicated by the flow arrow (key 15, figure 18, 19, or 20) on the valve
body.
4. Use accepted piping and welding practices when installing the valve in the line. For welding end valve bodies,
completely disassemble the valve removing all trim parts before welding the valve body in the line. For flanged
valve bodies, use suitable gaskets between the valve body flanges and pipeline flanges.
Figure 2. Lubricator and Lubricator/Isolating Valve
14
LUBRICATOR
14
July 2017
27
10A9421‐A
AJ5428‐D
A0832‐2
LUBRICATOR/ISOLATING VALVE
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. Shrunk‐fit pieces and threaded connections might loosen.
If post‐weld heat treating is needed, remove all trim parts to avoid any damage to internal elastomeric, plastic, and metal
parts. Contact your Emerson sales office
5. Install a three‐valve bypass around the valve if continuous operation is required during maintenance.
6. If the actuator and valve body are shipped separately, refer to the actuator mounting procedure in the appropriate
actuator instruction manual.
7. If the valve was shipped without packing installed in the packing box, install the packing before putting the valve
into service. Refer to instructions given in the Packing Maintenance procedure.
Valves with ENVIRO‐SEAL live‐loaded packing or HIGH‐SEAL Heavy‐Duty live‐loaded packing will not require this initial
re‐adjustment. See the Fisher instruction manuals titled ENVIRO‐SEAL Packing System for Sliding‐Stem Valves
(
D101642X012) or HIGH‐SEAL Live‐Loaded Packing System (D101453X012) (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.
or Local Business Partner for additional information.
5
EH (1-1/2x1 through 8x6)
July 2017
Instruction Manual
D100394X012
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, adding packing rings, replacing packing, trim removal, valve plug maintenance, lapping seats,
and trim replacement. 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 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.
Table 7. Recommended Torque for Packing Flange Nuts
STEM
DIAMETER
mm Inches Min Max Min Max
12.7 1/2
19.1 3/4
25.4 1
31.8 1‐1/4
1. Includes intermediate class ratings.
VALVE
BODY
RATING(1)
CL1500 15 22 11 16
CL2500 18 24 13 18
CL1500 34 50 25 37
CL2500 41 61 30 45
CL1500 52 77 38 57
CL2500 61 91 45 67
CL1500 68 102 50 75
CL2500 81 122 60 90
NSm LbfSFt
Note
Whenever a gasket seal is disturbed by removing or shifting gasketed parts, a new gasket should be installed upon reassembly.
This is necessary to ensure a good gasket seal.
Note
If the valve has ENVIRO‐SEAL live‐loaded packing installed (figure 3), see the Fisher instruction manual entitled ENVIRO‐SEAL
Packing System for Sliding‐Stem Valves (D101642X012
) for packing instructions.
If the valve has HIGH‐SEAL heavy‐duty live‐loaded packing installed, see Fisher instruction manual entitled HIGH‐SEAL Live‐Loaded
Packing System (D101453X012
) for packing instructions.
TORQUE
6
Instruction Manual
D100394X012
EH (1-1/2x1 through 8x6)
WARNING
Personal injury could result from packing leakage. Valve packing was tightened prior to shipment; however some
readjustment will be required 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.
Packing Lubrication
CAUTION
Do not lubricate graphite packing. Graphite packing is self-lubricated. Additional lubrication may result in slip-stick
movement of the valve.
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).
July 2017
A lubricator or lubricator/isolating valve (figure 2) is recommended for PTFE‐composition packing. The lubricator or
lubricator/isolating valve is installed in place of the pipe plug (key 14, figure 16). It is recommended that a good quality
silicon‐base lubricant be used. To operate the lubricator, simply turn the cap screw clockwise to force lubricant into
the packing box. The lubricator/isolating valve operates the same way except the isolating valve must first be opened
and then closed after lubrication is completed.
Packing Maintenance
If there is undesirable packing leakage in spring‐loaded PTFE V‐ring packing (figure 4), tighten the packing flange nuts
(key 5, figure 16) until the shoulder on the packing follower (key 13, figure 16) contacts the bonnet (key 1, figure 16).
If leakage continues, replace the packing by following the numbered steps presented in the Replacing Packing
procedure.
CAUTION
When tightening packing flange nuts, do not exceed the maximum recommended torque in table 7 or excessive friction
may result, resulting in keeping the valve from stroking fully and not attaining proper seat load.
If there is undesirable packing leakage 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 16) to at least the minimum
recommended torque in table 7. However, do not exceed the maximum recommended torque in table 7 or excessive
friction may result. If leakage continues, replace the packing by following the numbered steps presented in the
Replacing Packing procedure.
If the packing is relatively new and tight on the valve plug stem, and if tightening the packing flange nuts does not stop
the leakage, it is possible that the stem is worn or nicked so that a seal cannot be made. The surface finish of a stem is
critical for making a good packing seal. If the leakage comes from the outside diameter of the packing, it is possible
that the leakage is caused by nicks or scratches around the packing box wall. While replacing the packing according to
the Replacing Packing procedure, inspect the valve plug stem and packing box wall for nicks or scratches.
7
EH (1-1/2x1 through 8x6)
July 2017
Instruction Manual
D100394X012
Replacing Packing
Key numbers referred to in this procedure are shown in figure 16 unless otherwise indicated.
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.
Remove the cap screws in the stem connector, 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 either the yoke locknut (key 15) or the hex nuts (key 26), and remove the actuator from the bonnet (key 1).
3. Loosen the packing flange nuts (key 5) so that the packing is not tight on the valve plug stem (key 4, figure 18, 19,
or 20). Remove any travel indicator disk and stem locknuts from the valve plug stem threads.
Table 8. Torque for Body‐to‐Bonnet Bolting Using Anti‐Seize Lubricant(1)
VALVE
SIZE,
NPS
1, 1-1/2 x 1, 2x1
2, 3x2
3, 4x3
4, 6x4
6, 8x6
1. For other materials, contact your Emerson sales office or Local Business Partner for torques.
VALVE
BODY
RATING
CL1500 163 122 120 90
CL2500 258 195 190 140
CL1500 258 195 190 140
CL2500 380 285 280 210
CL1500 556 420 410 310
CL2500 786 597 580 440
CL1500 786 597 580 440
CL2500 1058 800 780 590
CL1500 1383 1044 1020 770
CL2500 2807 2102 2070 1550
B7, B16, BD and 660 Studs B8 and B8M Studs B7, B16, BD and 660 Studs B8 and B8M Studs
NSm LbfSFt
TORQUE
CAUTION
When lifting the bonnet (key 1), be sure that the valve plug and stem assembly (keys 3 and 4, figure 18, 19, or 20) remains
on the seat ring (key 6, figure 18, 19, or 20). 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.
Use care to avoid damaging gasket sealing surfaces.
The EHD piston rings (key 8, figure 18) are brittle and in two halves. Avoid damaging the piston rings by dropping or rough
handling.
WARNING
If the cage adheres to the bonnet as the bonnet is lifted, secure the cage to the bonnet so that it will not cause personal
injury or equipment damage should it fall unexpectedly.
4. Unscrew the hex nuts (key 14, figure 18, 19, or 20) and carefully lift the bonnet off the valve stem. If present,
remove the Belleville washers (key 33, figure 17) and flat washers (key 29, figure 18, 19, 17, or 20). If the valve plug
and stem assembly starts to lift with the bonnet, use a brass or lead hammer on the end of the stem and tap it back
down. Set the bonnet on a cardboard or wooden surface to prevent damage to the bonnet gasket surface.
5. Remove the valve plug (key 3, figure 18, 19, or 20), the cage (key 2, figure 18, 19, or 20), and the top and bottom
cage gaskets (key 11, figure 18, 19, or 20).
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Instruction Manual
D100394X012
Figure 3. Live‐Loaded Packing
39B4153‐A
EH (1-1/2x1 through 8x6)
July 2017
Typical HIGH‐SEAL ULF Packing System
39B4612/A
A6297‐1
200
212
201
215
216
207
209
211
A6722
Typical ENVIRO‐SEAL Packing System
with PTFE Packing
213
217
207
207
214
207
Typical ENVIRO‐SEAL Packing System
with Graphite ULF Packing
Typical ENVIRO‐SEAL Packing System
with Duplex Packing
9
EH (1-1/2x1 through 8x6)
July 2017
Figure 4. Packing Arrangements
Instruction Manual
D100394X012
UPPER WIPER (KEY 12)
12A8160‐A
PTFE V‐RING
SINGLE PACKING
UPPER WIPER (KEY 12)
PACKING FOLLOWER
(KEY 13)
FEMALE ADAPTOR
(KEY 32)
V‐RING (KEY 7)
MALE ADAPTOR
(KEY 31)
LANTERN RING
(KEY 8)
PACKING FOLLOWER
(KEY 13)
FEMALE ADAPTOR
(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)
KEY 6
1
KEY 6
1
3
14A3412‐C
GRAPHITE RIBBON AND FILAMENT
SINGLE PACKING
PACKING FOLLOWER
(KEY 13)
GRAPHITE RIBBON
PACKING RING (KEY 7)
GRAPHITE FILAMENT
PACKING RING (KEY 7)
2
LANTERN RING
(KEY 8)
PACKING FOLLOWER
(KEY 13)
GRAPHITE RIBBON
PACKING RING (KEY 7)
GRAPHITE FILAMENT
PACKING RING (KEY 7)
2
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
(KEY 11)
12A7839‐A
Sht 1
PTFE V‐RING
LOWER WIPER
(KEY 30)
DOUBLE PACKING
NOTES:
1
0.102 mm (0.004 INCH) THICK SACRIFICIAL ZINC WASHERS.
USE ONLY ONE BELOW EACH GRAPHITE RIBBON RING.
C0637‐1
1
3
14A3414‐C
GRAPHITE RIBBON AND FILAMENT
DOUBLE PACKING
PACKING BOX RING
(KEY 11)
12A8163‐A
PTFE/COMPOSITION
DOUBLE PACKING
2
HAS THE APPEARANCE OF A WOVEN OR BRAIDED RING.
INCLUDED IN KEY 6 PACKING SET.
3
PACKING BOX RING
(KEY 11)
CAUTION
All residual gasket material must be removed from the cage gasket surfaces. If the gasket surfaces are scored or damaged
during this process, smooth them by hand sanding with 360 grit paper using long, sweeping strokes. Failure to remove all
residual gasket material and/or burrs from the gasket surfaces will result in leakage.
6. Clean all gasket surfaces with a good quality degreaser. Remove all residual tin or silver from all 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.
8. Remove the packing flange nuts (key 5), packing flange (key 3), upper wiper (key 12), and packing follower (key 13,
figures 4 and 16). Carefully push out all the remaining packing parts from the valve side of the bonnet using a
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Instruction Manual
D100394X012
EH (1-1/2x1 through 8x6)
July 2017
rounded rod or other tool that will not scratch the packing box wall. For extension bonnets, also remove the baffle
(key 2) and retaining ring (key 35).
9. Clean the packing box and the following metal packing parts: packing follower (key 13), packing box ring (key 11),
spring or lantern ring (key 8, figures 4 and 16), and, for single arrangements of PTFE V‐ring packing only, special
washer (key 10, figures 4 and 16).
10. Inspect the valve stem threads for any sharp edges that might cut the packing. A whetstone or emery cloth may
be used to smooth the threads if necessary.
11. Remove the protective covering from the valve body cavity. Using new top and bottom cage gaskets (key 11,
figure 18, 19, or 20), place the cage into the valve body. Be sure the cage lugs are engaged in the corresponding
recesses of the seat ring retainer. Turn the cage clockwise until the lugs contact the seat ring retainer. Install the
plug, then slide the bonnet over the stem and onto the studs (key 13, figure 18, 19, or 20).
Note
The prelubricated hex nuts (key 14, figure 18, 19, or 20) referred to in step 12 can be identified by a black film coating on the nut
threads.
The proper bolting procedures in step 12 include‐‐but are not limited to‐‐ensuring that the bonnet stud threads are clean,
Belleville washers (if present) are installed in the correct orientation, and that the hex nuts are evenly tightened to the specified
torque values.
CAUTION
Failure to comply with good bonnet‐to‐body bolting practices and the torque values shown in table 8 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.
Note
Stud(s) and nut(s) should be installed such that the manufacturer's trademark and material grade marking is visible, allowing easy
comparison to the materials selected and documented in the Emerson/Fisher serial card provided with this product.
WARNING
Personal injury or damage to equipment could occur if improper stud and nut materials or parts are used. Do not operate or
assemble this product with stud(s) and nut(s) that are not approved by Emerson/Fisher engineering and/or listed on the
serial card provided with this product. Use of unapproved materials and parts could lead to stresses exceeding the design
or code limits intended for this particular service. Install studs with the material grade and manufacturer's identification
mark visible. Contact your Emerson sales office
and approved parts is suspected.
12. Lubricate the stud threads and the faces of the hex nuts (key 14, figure 18, 19, or 20) with anti‐seize lubricant (not
necessary if new factory prelubricated hex nuts are used). Replace the flat washers (key 29, figure 18, 19, 17, or 20)
if present. If the valve assembly includes Belleville washers (key 33, figure 17) install these onto the studs (key 14,
figure 17) with the concave side facing towards the valve body. Replace the hex nuts but do not tighten them.
Torque the nuts in a crisscross pattern to no more than one fourth of the nominal torque value specified in table 8.
or Local Business Partner immediately if a discrepancy between actual parts
11
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