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D10
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2
1- through 8 x 6-InchDesign EHD, EHS, and EHT Valves�����
Scope of ManualThis instruction manual includes installation, mainte-nance, and parts information for the Design EHD,EHS, and EHT control valves in 1 through 8 x 6-inchsizes. Refer to separate manuals for instructions cov-ering the actuator, positioner, HIGH-SEAL� packing,and accessories.
Figure 1. 2-Inch EH Series Valve with Type 657 Actuator
W3387 / IL
Only personnel qualified through training or experienceshould install, operate, and maintain the Design EHD,EHS, or EHT valve. If you have any questions aboutthese instructions, contact your Fisher Controls salesoffice or sales representative before proceeding.
Instruction ManualForm 5163November 1998 Design EH (1- through 8 x 6-Inch)
Design EH (1- through 8 x 6-Inch)
2
Table 1. Specifications
End Connection Styles
Buttwelding: All available ASME B16.25 sched-ules that are compatible with ASME B16.34 pres-sure/temperature ratingsFlanged: ANSI Class � 900, � 1500, or � 2500� ring-type joint (RTJ) or � raised-face (RF)flanges according to ASME B16.5Socket Welding: Consistent with ASME B16.11
Maximum Inlet Pressure (1)
Buttwelding: Consistent with Class 1500 or 2500pressure-temperature ratings per ASME B16.34Flanged: Consistent with Class 900, 1500, and2500 pressure-temperature ratings per ASME B16.34Socket Welding: Consistent with Class 1500 and2500 pressure-temperature ratings per ASME B16.34
Shutoff Classifications
See table 2
C-seal trim: High-temperature, Class V. See table 3
TSO (Tight Shutoff) trim: See tables 4 and 5
Flow Characteristic
Standard Cage: � Equal percentage, � modifiedequal percentage(2), � or linearStandard Cage with Micro-Form � Valve Plug (1and 2-Inch Valves Only): � Equal percentage or� modified equal percentage(2)
Standard Cage with Micro-Flute � Valve Plug(1-Inch Valve Only): � Equal percentage or� modified equal percentage(2)
Cavitrol � III or Whisper Trim � III Cage: Linear
Flow Direction
Design EHD or EHT: Flow down, except with ei-ther a Whisper Trim III cage or a valve plug withdiverter cone, both of which are flow upDesign EHS: Flow up, except flow down with Cavi-trol III cage
Approximate Weights (Valve Body and Bonnet As-semblies)
See table 6
Additional Specifications
For specifications such as materials, valve plugtravels, and port, yoke boss, and stem diameters,see the Parts List section
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.
Table 2. Shutoff Classifications per ANSI/FCI 70-2Valve
DesignValve Size,
InchesANSI
Leakage Class
2 & 3 x 2 II
3, 4 x 3, II—Standard
EHD3, 4 x 3,4, 6 x 4 III—Optional(1)EHD
6 8 x 6III—Standard
6, 8 x 6IV—Optional(1)
EHS w/Cavitrol III, orEHT w/Cavitrol III
All V(1)
EHS, EHT,EHS w/Micro Form or All
IV—StandardEHS w/Micro-Form orEHS w/Micro Flute
AllV—Optional(1)
EHT w/ PEEKAnti-Extrusion Rings
2 to 6 V to 600�F (316�C)
1. O-ring seat ring construction recommended for this shutoff classification; fortemperatures below 450�F (232�C) only.
DescriptionThe Design EHD, EHS, and EHT high-pressure globevalves (figure 1) have metal seats, cage guiding, andpush-down-to-close valve plug action. The DesignEHD and EHT valves use balanced valve plugs. TheDesign EHS valve uses an unbalanced valve plug. Toprovide a seal between the cage and a balanced valve
plug, the Design EHD valve plug uses piston rings; theDesign EHT valve plug uses a pressure-assisted sealring. A Whisper Trim cage can be used with a DesignEHD, EHS, or EHT valve plug. A Cavitrol III cage canbe used with a Design EHS or EHT valve plug.
C-seal trim is available for Design EHD valves, class1500, in sizes 3, 4, 6, 4x3, 6x4, and 8x6 and class2500, 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 plugseal is formed from metal (N07718 nickel alloy, Incon-el 718) rather than an elastomer, a valve equippedwith the C-seal trim can be applied in processes with afluid temperature of up to 1100�F (593�C), providedother material limits are not exceeded.
SpecificationsSpecifications for the Design EHD, EHS, and EHTvalves are shown in table 1.
Design EH (1- through 8 x 6-Inch)
3
Table 3. Additional Shutoff ClassificationValve Design (Class) Valve Size, Inches Port Diameter, Inches Cage Style ANSI Leakage Class
34 x 3
2-7/8
Equal PercentageModified Equal Percentage
Linear (std. cage)Linear (Whisper III, A1, B1)
2-7/8 Linear (Whisper III, D3)Linear (Cavitrol III, 3-stage
43-7/16 Linear (Cavitrol III, 2-stage)
Design EHD(Class 1500)
46 x 4
3-5/8
Equal PercentageModified Equal Percentage
Linear (std. cage)Linear (Whisper III, A1, B3, C3)
V (for portdiameters from 2-7/8 through 7-inch withoptional C-seal trim)
4-3/8 Linear (Whisper III, D3)o tional C seal trim)
4-9/16 Linear (Cavitrol III, 3-stage)
6 5-1/4 Linear (Cavitrol III, 2-stage)68 x 6
5-3/8
Equal PercentageModified Equal Percentage
Linear (std. cage)Linear (Whisper III, A1, B3, C3)
To avoid personal injury or propertydamage resulting from the sudden re-lease of pressure, do not install thevalve assembly where service condi-tions could exceed the limits given inthis manual or on the appropriate name-plates. Use pressure-relieving devicesas required by government or acceptedindustry codes and good engineeringpractices.
CAUTION
The valve configuration and construc-tion materials were selected to meet par-ticular pressure, temperature, pressuredrop, and controlled fluid conditions.Because some body/trim material com-binations are limited in their pressuredrop and temperature range capabilities(especially due to differences in thermalexpansion rates), do not apply any otherconditions to the valve without first con-tacting your Fisher Controls sales officeor sales representative.
Design EH (1- through 8 x 6-Inch)
4
Table 6. Approximate Weights (Valve Body andBonnet Assemblies)
CLASS 1500 CLASS 2500
VALVE Pounds Kilograms Pounds KilogramsVALVESIZE,
INCHES FlgSWE
&BWE
FlgSWE
&BWE
FlgSWE
&BWE
FlgSWE
&BWE
1 102 89 46 40 120 101 54 46
1-1/2 x 1 - - - 89 - - - 40 - - - 101 - - - 46
2 x 1 134 90 61 41 173 104 78 47
2 222 185 101 84 261 203 118 92
3 x 2 267 187 121 85 355 207 161 94
3 349 278 158 126 492 359 223 163
4 x 3 394 277 179 126 585 357 265 162
4 548 444 249 201 745 536 338 243
6 x 4 740 441 336 200 1160 567 526 257
6 1228 1003 557 455 1731 1199 785 544
8 x 6 1451 1236 658 561 2106 1231 955 558
CAUTION
If hoisting the valve, use a nylon sling toprotect the painted surfaces. Carefullyposition the sling to prevent damage tothe tubing or any accessories. Also,take precautions to prevent personnelfrom being injured in case the hoist orrigging slips unexpectedly. Refer totable 6 for valve assembly weights.Using adequately sized hoists andchains or slings to handle the valve isimportant.
1. Before installing the valve, inspect it to ensure thatthe valve body cavity is free of foreign material.
2. Clean out all pipelines to remove scale, weldingslag, and other foreign materials before installing thevalve.
Note
If the valve being installed has small in-ternal flow passages, such as withWhisper Trim III or Cavitrol III cages,consideration should be given to instal-ling an upstream strainer to prevent thelodging of particles in these passages.This is especially important if the pipe-line cannot be thoroughly cleaned or ifthe flowing medium is not clean.
3. The control valve must be installed with the actua-tor vertical above the valve body for proper operation.Flow through the valve must be in the direction indi-
cated by the flow arrow (key 15, figure 19, 20, or 21)on the valve body.
4. Use accepted piping and welding practices wheninstalling the valve in the line. For welding end valvebodies, completely disassemble the valve removing alltrim parts before welding the valve body in the line.For flanged valve bodies, use suitable gaskets be-tween the valve body flanges and pipeline flanges.
Note
Depending on valve body materialsused, post-weld heat treating might beneeded. Post-weld heat treatment candamage internal elastomeric, plastic,and metal parts. Shrunk-fit pieces andthreaded connections might loosen. Ingeneral, if post-weld heat treating isneeded, remove all trim parts. Contactyour Fisher Controls sales office orsales representative for additional in-formation.
5. Install a three-valve bypass around the valve if con-tinuous operation is required during maintenance.
6. If the actuator and valve body are shipped sepa-rately, refer to the actuator mounting procedure in theappropriate actuator instruction manual.
WARNING
Personal injury could result from pack-ing leakage. Valve packing was tight-ened prior to shipment; however somereadjustment will be required to meetspecific service conditions.
7. If the valve was shipped without packing installed inthe packing box, install the packing before putting thevalve into service. Refer to instructions given in thePacking Maintenance procedure.
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Valve parts are subject to normal wear and must beinspected and replaced as necessary. Inspection andmaintenance frequency depends on the severity ofservice conditions. This section includes instructionsfor packing lubrication, packing maintenance, addingpacking rings, replacing packing, trim removal, valveplug maintenance, lapping seats, and trim replace-ment. All maintenance operations can be performedwith the valve in the line.
Because of the care Fisher Controls takes in meetingall manufacturing requirements (heat treating, dimen-sional tolerances, etc.) use only replacement partsmanufactured or furnished by Fisher Controls.
Design EH (1- through 8 x 6-Inch)
5
Figure 2. Lubricator and Lubricator/Isolating Valve
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WARNING
Avoid personal injury from sudden re-lease of process pressure. Before per-forming any maintenance operations:
� Disconnect any operating lines pro-viding air pressure, electric power, or acontrol signal to the actuator. Be surethe actuator cannot suddenly open orclose the valve.
� Use bypass valves or completelyshut off the process to isolate the valvefrom process pressure. Relieve processpressure on both sides of the valve.Drain the process media from bothsides of the valve.
� Vent the power actuator loadingpressure and relieve any actuator springprecompression.
� Use lock-out procedures to be surethat the above measures stay in effectwhile you work on the equipment.
Note
Whenever a gasket seal is disturbed byremoving or shifting gasketed parts, anew gasket should be installed uponreassembly. This is necessary to ensurea good gasket seal.
Table 7. Recommended Torque for Packing Flange Nuts
STEM VALVE TORQUESTEMDIAMETER
VALVEBODY Lbf �Ft N�m
Inches mmBODY
RATING Min Max Min Max
1/2 12 7Class 1500 11 16 15 22
1/2 12.7Class 2500 13 18 18 24
3/4 19 1Class 1500 25 37 34 50
3/4 19.1Class 2500 30 45 41 61
1 25 4Class 1500 38 57 52 77
1 25.4Class 2500 45 67 61 91
1 1/4 31 8Class 1500 50 75 68 102
1-1/4 31.8Class 2500 60 90 81 122
Note
If the valve has HIGH-SEAL heavy-dutylive-loaded packing installed, see FisherControls instruction manual entitledHIGH-SEAL Live-Loaded Packing Sys-tem’ for packing instructions.
Packing LubricationA lubricator or lubricator/isolating valve (figure 2) isrecommended for PTFE-composition packing. Thelubricator or lubricator/isolating valve is installed inplace of the pipe plug (key 14, figure 17). It is recom-mended that a good quality silicon-base lubricant beused. Do not lubricate packing used in processes withtemperatures over 500�F (260�C). To operate the lu-bricator, simply turn the cap screw clockwise to forcelubricant into the packing box. The lubricator/isolatingvalve operates the same way except the isolatingvalve must first be opened and then closed after lu-brication is completed.
Packing MaintenanceIf there is undesirable packing leakage in spring-loaded PTFE V-ring packing (figure 3), tighten thepacking flange nuts (key 5, figure 17) until the shoul-der on the packing follower (key 13, figure 17) con-tacts the bonnet (key 1, figure 17). If leakage contin-ues, replace the packing by following the numberedsteps presented in the Replacing Packing procedure.
If there is undesirable packing leakage with other thanspring-loaded PTFE V-ring packing, first try to limit theleakage and establish a stem seal by tightening thepacking flange nuts (key 5, figure 17) to at least theminimum recommended torque in table 7. However,do not exceed the maximum recommended torque intable 7 or excessive friction may result. If leakage con-tinues, replace the packing by following the numberedsteps presented in the Replacing Packing procedure.
If the packing is relatively new and tight on the valveplug stem, and if tightening the packing flange nutsdoes not stop the leakage, it is possible that the stemis worn or nicked so that a seal cannot be made.
Design EH (1- through 8 x 6-Inch)
6
Figure 3. Packing Arrangements
UPPER WIPER (KEY 12)
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12A8160-A
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)
PACKING FOLLOWER(KEY 13)
PACKING BOX RING(KEY 11)
GRAPHITE RIBBONPACKING RING (KEY 7)
GRAPHITE FILAMENTPACKING RING (KEY 7)
LANTERN RING(KEY 8)
KEY 6
14A3412-C
1
2
3
1
1
PACKING FOLLOWER(KEY 13)
PACKING BOX RING(KEY 11)
GRAPHITE RIBBONPACKING RING (KEY 7)
GRAPHITE FILAMENTPACKING RING (KEY 7)
LANTERN RING(KEY 8)
2
UPPER WIPER (KEY 12)
PACKING FOLLOWER(KEY 13)
V-RING (KEY 7)
MALE ADAPTOR(KEY 31)
LANTERN RING(KEY 8)
PACKING BOX RING(KEY 11)
LOWER WIPER(KEY 30)
KEY 6
3
FEMALE ADAPTOR(KEY 32)
UPPER WIPER (KEY 12)
PACKING FOLLOWER(KEY 13)
LANTERN RING(KEY 8)
PACKING BOX RING(KEY 11)
PACKING RING(KEY 7)
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14A3414-C12A8163-A
NOTES:
0.004 INCH (0.102 mm) THICK SACRIFICIAL ZINC WASHERS.USE ONLY ONE BELOW EACH GRAPHITE RIBBON RING.
HAS THE APPEARANCE OF A WOVEN OR BRAIDED RING.INCLUDED IN KEY 6 PACKING SET.
1 2
3C0637-1 / IL
The surface finish of a stem is critical for making agood packing seal. If the leakage comes from the out-side diameter of the packing, it is possible that theleakage is caused by nicks or scratches around thepacking box wall. While replacing the packing accord-ing to the Replacing Packing procedure, inspect thevalve plug stem and packing box wall for nicks orscratches.
Replacing PackingKey numbers referred to in this procedure are shownin figure 17 unless otherwise indicated.
1. Isolate the control valve from the line pressure, re-lease pressure from both sides of the valve body, anddrain the process media from both sides of the valve.
Remove the cap screws in the stem connector, andseparate the two halves of the stem connector. Thenexhaust all actuator pressure, if any was applied, anddisconnect the actuator supply and any leakoff piping.
2. Remove either the yoke locknut (key 15) or the hexnuts (key 26), and remove the actuator from the bon-net (key 1).
3. Loosen the packing flange nuts (key 5) so that thepacking is not tight on the valve plug stem (key 4, fig-ure 19, 20, or 21). Remove any travel indicator diskand stem locknuts from the valve plug stem threads.
Design EH (1- through 8 x 6-Inch)
7
Table 8. Torque for Body-to-Bonnet Bolting Using Nickel Never Seez Lubricant
VALVE VALVETORQUE
VALVESIZE,
VALVEBODY
Lbf �Ft N�mSIZE,
INCHESBODY
RATING B7, B16, BDand 660 Studs
B8 and B8M Studs B7, B16, BDand 660 Studs
B8 and B8M Studs
1 1 1/2 x 1 2 x 1Class 1500 120 90 163 122
1, 1-1/2 x 1, 2 x 1Class 2500 190 140 258 195
2 3 x 2Class 1500 190 140 258 195
2, 3 x 2Class 2500 280 210 380 285
3 4 x 3Class 1500 410 310 556 420
3, 4 x 3Class 2500 580 440 786 597
4 6 x 4Class 1500 580 440 786 597
4, 6 x 4Class 2500 780 590 1058 800
6 8 x 6Class 1500 1020 770 1383 1044
6, 8 x 6Class 2500 2070 1550 2807 2102
CAUTION
When lifting the bonnet (key 1), be surethat the valve plug and stem assembly(keys 3 and 4, figure 19, 20, or 21) re-mains on the seat ring (key 6, figure 19,20, or 21). This avoids damage to theseating surfaces as a result of the as-sembly dropping from the bonnet afterbeing lifted part way out. The parts arealso easier to handle separately.
Use care to avoid damaging gasket seal-ing surfaces.
The Design EHD piston rings (key 8, fig-ure 19) are brittle and in two pieces.Avoid damaging the piston rings bydropping or rough handling.
WARNING
If the cage adheres to the bonnet as thebonnet is lifted, secure the cage to thebonnet so that it will not cause personalinjury or equipment damage should itfall unexpectedly.
4. Unscrew the hex nuts (key 14, figure 19, 20, or 21)and carefully lift the bonnet off the valve stem. If thevalve plug and stem assembly starts to lift with thebonnet, use a brass or lead hammer on the end of thestem and tap it back down. Set the bonnet on a card-board or wooden surface to prevent damage to thebonnet gasket surface.
5. Remove the valve plug (key 3, figure 19, 20, or 21),the cage (key 2, figure 19, 20, or 21), and the top andbottom cage gaskets (key 11, figure 19, 20, or 21).
CAUTION
All residual gasket material must be re-moved from the the cage gasket sur-faces. If the gasket surfaces are scoredor damaged during this process,smooth them by hand sanding with 360grit paper using long, sweeping strokes.Failure to remove all residual gasket ma-terial and/or burrs from the gasket sur-faces will result in leakage.
6. Clean all gasket surfaces with a good quality de-greaser. Remove all residual tin or silver from all gas-ket surfaces.
7. Cover the opening in the valve body to protect thegasket surface and to prevent foreign material fromgetting into the valve body cavity.
8. Remove the packing flange nuts (key 5), packingflange (key 3), upper wiper (key 12), and packing fol-lower (key 13, figures 3 and 17). Carefully push out allthe remaining packing parts from the valve side of thebonnet using a rounded rod or other tool that will notscratch the packing box wall. For extension bonnets,also remove the baffle (key 2) and retaining ring (key35).
9. Clean the packing box and the following metalpacking parts: packing follower (key 13), packing boxring (key 11), spring or lantern ring (key 8, figures 3and 17), and, for single arrangements of PTFE V-ringpacking only, special washer (key 10, figures 3 and17).
10. Inspect the valve stem threads for any sharpedges that might cut the packing. A whetstone oremery cloth may be used to smooth the threads if nec-essary.
11. Remove the protective covering from the valvebody cavity. Using new top and bottom cage gaskets(key 11, figure 19, 20, or 21), place the cage into thevalve body. Be sure the cage lugs are engaged in the
Design EH (1- through 8 x 6-Inch)
8
corresponding recesses of the seat ring retainer. Turnthe cage clockwise until the lugs contact the seat ringretainer. Install the plug, then slide the bonnet over thestem and onto the studs (key 13, figure 19, 20, or 21).
Note
The prelubricated hex nuts (key 14, fig-ure 19, 20, or 21) referred to in step 12can be identified by a black film coatingon the nut threads.
The proper bolting procedures in step12 include—but are not limited to—en-suring that the bonnet stud threads areclean, and that the hex nuts are evenlytightened to the specified torque values.
CAUTION
Failure to comply with good bonnet-to-body bolting practices and the torquevalues shown in table 8 may result incage crushing, cage diameter reduction,and/or bonnet deformation. Cheaterbars or slug wrenches should not beused for this procedure.
Hot torquing is not recommended.
12. Lubricate the stud threads and the faces of thehex nuts (key 14, figure 19, 20, or 21) with Never-Seez(1) Pure Nickel Special lubricant or equivalent(not necessary if new factory prelubricated hex nutsare used). Replace the washers and hex nuts but donot tighten them. Torque the nuts in a crisscross pat-tern to no more than 1/4 of the nominal torque valuespecified in table 8. When all nuts are tightened to thattorque value, increase the torque by 1/4 of the speci-fied nominal torque and repeat the crisscross pattern.Repeat this procedure until all nuts are tightened tothe specified nominal value. Apply the final torque val-ue again and, if any nut still turns, tighten every nutagain.
Note
If graphite ribbon/filament packing ringsare used, special procedures must beobserved to prevent entrapping air be-tween the rings. Add the rings one at atime without forcing them below thechamfer of the packing box entrancechamber. As each successive ring isadded, the stack should not be pusheddown more than the thickness of theadded ring (figure 4).
Figure 4. Installing Graphite Ribbon/FilamentPacking Rings One at a Time
VALVE STEM
PACKING FOLLOWER
BONNET
TOP OF PACKINGRING EVEN WITHBOTTOM OF ENTRANCECHAMFER
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13. Install new packing and the metal packing boxparts according to the appropriate arrangement in fig-ure 3. If desired, packing parts may be pre-lubricatedwith a silicon base grease for easier installation. Slip asmooth-edged pipe over the valve stem, and gentlytamp each soft packing part into the packing box, be-ing sure that air is not trapped between adjacent softparts. For a valve with extension bonnet, also installthe baffle and retaining rings (keys 2 and 35).
14. Slide the packing follower, wiper, and packingflange into position. Lubricate the packing flange studs(key 4) and the faces of the packing flange nuts (key5). Replace the packing flange nuts.
For spring-loaded PTFE V-ring packing, tighten thepacking flange nuts until the shoulder on the packingfollower (key 13) contacts the bonnet.
For other packing types, tighten the packing flangenuts to the maximum recommended torque shown intable 7. Then, loosen the packing flange nuts, and re-tighten them to the recommended minimum torqueshown in table 7.
15. Mount the actuator on the valve body assembly,and reconnect the actuator and valve plug stems ac-cording to the procedures in the appropriate actuatorinstruction manual.
Trim RemovalFor C-seal construction, see the appropriate C-seal sections in this instruction manual.
Trim removal and replacement requires the use of aseat ring retainer tool (key 25). If specifically ordered,a tool is supplied with a valve; but, the tool can also beordered separately by referencing the tool part numberin the Parts List. If desired, a tool can also be ma-chined for a valve of specific size and valve class us-ing the dimensions shown in figure 9. Machine the toolfrom a material listed in figure 9 or from a material with
Design EH (1- through 8 x 6-Inch)
9
a yield strength of at least 120,000 psi (827 MPa). Us-ing a tool of lower strength material may result in dam-age to the seat ring retainer or valve body threads.
Key numbers referenced in this procedure are shownin figure 19 for the Design EHD valve, figure 20 for theDesign EHS valve, and figure 21 for the Design EHTvalve except where indicated.
1. Remove the actuator and bonnet by following steps1 through 4 of the Replacing Packing procedure. Ob-serve all warnings and cautions.
2. Lift the valve stem and attached valve plug out ofthe valve body. If the valve plug is to be reused, tapeor otherwise protect the valve plug stem and the valveplug seating surface to prevent scratches.
3. Lift out the cage (key 2) and the top and bottomcage gaskets (key 11). For a valve with Cavitrol IIItwo-or three-stage cage, also remove the O-ring (key26, figure 22) that fits between the cage and the seatring (key 6).
Constructions other than TSO trim1. Use the seat ring retainer tool (figure 9) to removethe seat ring retainer (key 7) as follows:
a. Insert the tool into the valve body. Be certainthe tool lugs are engaged in the corresponding re-cesses in the retainer.
b. Use a power torque wrench or driver havingtorque capabilities equal to or greater than thoseshown in table 9. Connect the torque wrench to anextension if necessary. The tool or extension mustsnugly fit the square hole in the seat ring retainertool. Refer to figure 9 for square hole sizes.
c. Insert the tool or extension into the square holein the seat ring retainer tool.
d. Use the bonnet studs (key 13) to prevent a pow-er torque wrench from rotating.
CAUTION
Hold the torque wrench or driver at rightangles to the seat ring retainer when ap-plying torque. Tilting the tool or exten-sion while applying torque may causethe lugs on the seat ring retainer tool tosuddenly disengage from the recessesin the retainer, damaging the retainerand seat ring.
e. Unscrew and remove the seat ring retainer.
2. Remove the seat ring (key 6) and the seat ring gas-ket or O-ring (key 12).
3. Refer to the Valve Plug Maintenance procedure orto the Lapping Seats procedure.
TSO TrimTSO trim: 13/16 Inch Port Diameter (figure 6)
1. Remove the pin that locks the inner plug to thestem.
2. Using a strap wrench or similar tool, unscrew theouter plug from the inner plug. Do not damage the out-er plug guide surfaces.
3. Remove the protected soft seat seal (see figure 5).
4. Inspect the parts for damage and replace if needed.
5. Refer to the Valve Plug Maintenance procedure orto the Lapping Seats procedure.
TSO trim: 1-11/16 Port Diameter (figure 7)
1. Remove the retainer, backup ring, anti-extrusionrings, and piston ring.
2. Remove the set screws that lock the outer plug tothe stem.
3. Using a strap wrench or similar tool, unscrew theouter plug from the inner plug. Do not damage the out-er plug guide surfaces.
4. Remove the protected soft seat seal (see figure 5).
5. Inspect the parts for damage and replace if needed.
6. Refer to the Valve Plug Maintenance procedure orto the Lapping Seats procedure.
TSO trim: 2-11/16 Inch Port Diameter (figure 8)
1. Remove the retainer, backup ring, anti-extrusionrings, and piston ring.
2. Remove the set screws that lock the outer plug tothe inner plug.
3. Using a strap wrench or similar tool, unscrew theouter plug from the inner plug. Do not damage the out-er plug guide surfaces.
4. Remove the protected soft seat seal (see figure 5).
5. Inspect the parts for damage and replace if needed.
6. Refer to the Valve Plug Maintenance procedure orto the Lapping Seats procedure.
Design EH (1- through 8 x 6-Inch)
10
Figure 5. Detail of Protected Soft Seat
INNER PLUG
OUTER PLUG
CAGE
SEAT RING
PROTECTED SOFT SEAT
A7088 / IL
Valve Plug MaintenanceKey numbers used in this procedure are shown in fig-ure 19 for the Design EHD valve, in figure 20 for theDesign EHS valve, and in figure 21 for the DesignEHT valve.
1. With the valve plug (key 3) removed according tothe Trim Removal procedure, proceed as appropriate:
For the Design EHD valve, the piston rings (key 8)are each in two sections; remove the sections from thegrooves in the valve plug.
For the Design EHS valve, proceed to step 2.
For the Design EHT valve, work the retaining ring(key 10) off the valve plug with a screwdriver. Careful-ly slide the backup ring and seal ring (keys 9 and 8) offthe valve plug. For a 6-inch valve with a level D Whis-per Trim III cage, also remove the piston ring (key 30)from the grooves in the valve plug.
2. To replace the valve plug stem (key 4), drive outthe pin (key 5), and unscrew the stem from the valveplug.
CAUTION
Never reuse an old stem with a newvalve plug. Using an old stem with anew plug requires drilling a new pinhole in the stem. This weakens the stemand may cause the stem to fail in ser-vice. If a new valve plug is required, al-ways order a valve plug, stem, and pinas an assembly. Specify the correct partnumber of each of the three parts, butstate that the parts are being ordered asan assembly.
A used valve plug may be reused with anew stem. An exception is the CavitrolIII plug/stem assembly which must beordered and replaced as a unit.
3. Thread the new stem into the valve plug and tight-en it to the appropriate torque value given in table 10.Using the valve plug pin hole as a guide, drill the pinhole through the stem. Refer to table 10 for drill sizes.
4. Drive in the pin to lock the assembly.
5. If it is necessary to lap the seating surfaces, com-plete the Lapping Seats procedure before installing theDesign EHD piston rings or the Design EHT seal ring.
Design EH (1- through 8 x 6-Inch)
11
Figure 6. Typical Unbalanced TSO Trim Assembly, Small Port Designs (TSO Ports 13/16 Inch Diameter)
OUTER PLUG
PIN
INNER PLUG
PROTECTED SOFT SEAT
A7111 / IL
The Trim Replacement procedure provides piston ringand seal ring installation instructions and valve reas-sembly instructions.
Lapping SeatsKey numbers referenced in this procedure are shownin figure 19 for the Design EHD valve, in figure 20 forthe Design EHS valve, and in figure 21 for the DesignEHT valve unless otherwise indicated.
Seating surfaces of the valve plug (key 3) and the seatring (key 6) can be lapped for improved shutoff. Use agood quality lapping compound with a mixture thatcontains 280 to 600 grit. Apply the compound to thebottom of the valve plug. Use the following procedureto lap the seating surfaces.
1. Install the following parts according to the instruc-tions presented in the Trim Replacement procedure:seat ring gasket or O-ring (key 12), seat ring (key 6),seat ring retainer (key 7), cage (key 2), cage gaskets(key 11), and if used, the O-ring (key 26, figure 22).
Design EH (1- through 8 x 6-Inch)
12
VALVE PLUGSEAL
PROTECTEDSOFT SEAT
A7112 / IL
Figure 7. Typical Balanced TSO Trim (TSO Ports 1-11/16 Inch Diameter)
2. Proceed as appropriate:
For a Design EHD or EHT valve, install the valveplug and stem assembly (keys 3 and 4)—without pis-ton rings or seal ring (keys 8 and 30)—into the cage.
For a Design EHS valve, install the valve plug andstem assembly (keys 3 and 4) into the cage.
3. Install the bonnet (key 1, figure 17) over the valvestem, and secure the bonnet with four of the hex nuts(key 14).
4. Attach a handle, such as a piece of strap iron se-cured by stem locknuts, to the valve stem. Rotate thehandle alternately in each direction to lap the seats.
Figure 8. Typical Balanced TSO Trim, Large Port Designs(TSO Ports 2-11/16 Inch Diameter)
VALVE PLUGSEAL
PROTECTEDSOFT SEAT
A7096 / IL
Note
To preserve the effects of lapping, donot change either the position of theseat ring in the valve body cavity or theposition of the cage on the seat ring af-ter lapping the seating surfaces. If pos-sible, clean the parts without disturbingtheir positions. If the parts must be re-moved for cleaning, return them to theoriginal positions.
5. After lapping, again disassemble as necessary,clean the seating surfaces, reassemble, and test forshutoff. Repeat the lapping procedure if necessary.
Figure 9. Information for Machining and Use of Seat Ring Retainer Tool
DIM E
DIM GDIM F
1/16 R
DIA D
DIA C
125DIM HCHAM
DIA A
DIA B
3/4 MIN1-5/8 MAX
DIM J2 LUGS EQUALLY SPACED
DIM K
STUD BOLT
SEAT RING
SEAT RINGRETAINER
SEAT RINGRETAINER TOOL
TOOL LUG
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Design EH (1- through 8 x 6-Inch)
13
VALVE VALVE TOOL DIMENSIONSVALVESIZE,
VALVERATING, Inches mmSIZE,
INCHESRATING,CLASS A B C D(1) E F G H J(1) K A B C D(1) E F G H J(1) K
1, 1-1/2 x 1,1500 2.25 1.25 1.62 2.140
2.1204.75 0.44 0.31 0.44 0.49
0.480.75 57.2 31.8 41.1 54.4
51.9120.7 11.2 7.9 11.2 12.4
12.219.1
1, 1 1/2 x 1,2 x 1
2500 2.00 1.25 1.34 1.8271.807
4.38 0.44 0.31 0.44 0.490.48
0.75 50.8 31.8 34.1 46.445.9
111.3 11.2 7.9 11.2 12.412.2
19.1
2 3 x 2
1500 3.12 2.12 2.50 3.0152.995
6.19 0.50 0.38 0.50 0.490.48
0.75 79.2 53.8 63.5 76.676.1
157.2 12.7 9.7 12.7 12.412.2
19.1
2, 3 x 22500 2.75 2.00 2.12 2.640
2.6205.94 0.50 0.38 0.50 0.49
0.480.75 69.9 50.8 53.0 67.1
66.5150.9 12.7 9.7 12.7 12.4
12.219.1
3 4 x 3
1500 4.12 3.12 3.50 4.0153.995
7.00 0.50 0.38 0.50 0.990.98
1.00 104.7 79.2 88.9 102.0101.4
173.0 12.7 9.7 12.7 25.124.9
25.4
3, 4 x 32500 3.56 2.36 2.94 3.390
3.3707.31 0.50 0.38 0.50 0.74
0.731.00 90.5 65.0 74.6 86.1
85.6185.7 12.7 9.7 12.7 18.8
18.525.4
4 6 x 4
1500 5.12 4.12 4.31 4.8904.870
7.88 0.56 0.44 0.56 0.990.98
1.00 130.0 104.6 109.5 123.7124.2
200.1 14.2 11.2 14.2 25.124.9
25.4
4, 6 x 42500 4.62 3.50 3.62 4.265
4.2457.69 0.56 0.41 0.56 0.99
0.981.00 117.3 88.9 91.9 108.3
107.8195.3 14.2 10.4 14.2 25.1
24.925.4
6 8 x 6
1500 6.88 5.88 6.12 6.7656.745
10.00 0.56 0.44 0.56 0.990.98
1.50 174.6 149.3 155.4 171.8171.3
254.0 14.2 11.2 14.2 25.124.9
38.1
6, 8 x 62500 7.00 5.12 5.31 6.140
6.12010.00 0.56 0.41 0.56 0.99
0.961.50 177.8 130.0 134.9 156.0
155.4254.0 14.2 10.4 14.2 25.1
24.938.1
1. D and J dimensions list maximum and minimum values.
Materials for Machining Tool
RecommendedMaterials
MinimumRockwellHardness
416 stainless steel17-4PH stainless steel4100 Series heat-treated steel
283631
Design EH (1- through 8 x 6-Inch)
14
Table 9. Recommended Torque for Installing Seat Ring RetainerTORQUE
VALVESIZE,
INCHES
VALVEBODY
RATING,CLASS
For All Valves withGasketed Seat RingConstruction Except
Those withCavitrol III Cage
For All Valves withO-Ring Seat Ring
Construction (1) or forSour Gas Service
For Valve with 2-StageCavitrol III Cage andGasketed Seat Ring
Construction
For Valve with 3-StageCavitrol III Cage andGasketed Seat Ring
Construction
Lbf �Ft N�m Lbf �Ft N�m Lbf �Ft N�m Lbf �Ft N�m
1 1 1/2 x 1 2 x 11500 375 509 50 68 250 339 - - - - - -
1, 1-1/2 x 1, 2 x 12500 275 373 50 68 150 203 - - - - - -
321R, Never-Seez Pure Nickel Special, or equivalentWCC, WC9, C5, or LCC steelR30006 (Alloy 6) Never-Seez Pure Nickel Special or equivalent
CF8M (316 stainless steel) R30006 Dow Corning Molykote 321R, Never-Seez Pure NickelSpecial, or equivalent
Design EH (1- through 8 x 6-Inch)
15
Figure 10. Trim Surfaces Requiring Lubrication
SEAT RING RETAINER
A3583 / IL
SEAT RING GASKET OR O-RING
SEAT RING
VALVE BODY
LUBRICATION REQUIRED
1
1
1
Trim ReplacementAfter all trim maintenance has been completed, reas-semble the valve by following the numbered steps be-low. Be certain that all gasketed surfaces have beenwell cleaned. Key numbers referenced in this proce-dure are shown in figure 19 for the Design EHD valve,in figure 20 for the Design EHS valve, and in figure 21for the Design EHT valve.
CAUTION
Thoroughly clean the seat ring (key 6),seat ring retainer (key 7), and the retain-er threads in the valve body with agood-quality degreaser. Also clean allcage gasket surfaces. All residual gas-ket material must be removed from thecage gasket surfaces and, in gasketedseat ring constructions, from the ser-rated valve body and seat ring gasketsurfaces. If the serrations are scored ordamaged during this process, smooththem by hand sanding with 360 grit pa-per using long, sweeping strokes. Fail-ure to remove all residual gasket materi-al and/or burrs from the seat ring, cage,and valve body gasket surfaces will re-sult in leakage.
Thoroughly lubricate the surfaces indi-cated in figure 10 with the appropriatelubricant shown in table 11. Be certain
to lubricate the mating surfaces of bothparts involved (i.e., lubricate the threadson the seat ring retainer and the threadsin the valve body; lubricate the matingsurfaces of the seat ring retainer andseat ring).
Failure to lubricate as described maycause galling and improper gasket orO-ring (key 12) loading that may resultin leakage.
1. For gasketed seat ring constructions, install theseat ring gasket (key 12) into the valve body. For O-ring seat ring constructions, install the O-ring (key 12)into the groove on the underside of the seat ring (key6). Install the seat ring (key 6). Screw in the seat ringretainer (key 7). Use the seat ring retainer tool (figure9) to tighten the seat ring retainer as follows:
a. Insert the tool into the valve body. Be certainthe tool lugs are engaged in the corresponding re-cesses in the retainer.
b. Use a power torque wrench or driver havingtorque capabilities equal to or greater than thoseshown in table 9. Connect the torque tool to an ex-tension if necessary. The tool or extension mustsnugly fit the square hole in the seat ring retainertool. Refer to figure 9 for square hole sizes.
c. Insert the tool or extension into the square holein the seat ring retainer tool.
d. Use the stud bolts (key 13) to prevent a powertorque wrench from rotating.
CAUTION
Hold the torque wrench at right anglesto the seat ring retainer when applyingtorque. Tilting the tool and extensionwhile applying torque may cause thelugs on the seat ring retainer tool tosuddenly disengage from the recessesin the retainer, damaging the retainerand seat ring.
e. Tighten the seat ring retainer to the torqueshown in table 9.
Note
Some cages have one large window andseveral small windows. In step 2, installa cage that has different size windowsso that the largest window faces towardthe process outlet for a flow-down andtoward the process inlet for a flow-up
Design EH (1- through 8 x 6-Inch)
16
valve. Though it may not be possible toalign the large window directly oppositethe inlet or outlet, orient the window inthe appropriate direction as much aspossible. Incorrect orientation of cagewindows causes a reduction of capac-ity.
2. Proceed as appropriate:
For a valve with a Cavitrol III cage, slide the O-ring(key 26, figure 22) over the seat ring (key 6) andagainst the shoulder in the outer diameter of the seatring. Install the lower gasket (key 11) between thevalve body and cage (key 2), and install the cage. Becertain the lugs on the bottom of the cage engage thecorresponding slots in the seat ring retainer.
For all other valves, install the lower gasket (key 11)between the valve body and cage (key 2), and installthe cage. Be certain the lugs on the bottom of thecage engage the corresponding slots in the seat ringretainer.
Note
Rotate the cage clockwise by hand asmuch as possible once the cage lugsengage the slots in the seat ring retain-er. Failure to do so may result in leak-age at the seat ring to valve body seal.
Constructions other than TSO trim1. To install the piston rings and seal rings (keys 8and 30), proceed as appropriate:
For a Design EHD valve (figure 19), if it is necessaryto install new piston rings, the replacement pistonrings will arrive in one piece. Use a vise with smoothor taped jaws to break a replacement piston ring intohalves. Place the new ring in the vise so that the jawscompress the ring into an oval. Compress the ringslowly until the ring snaps on both sides. If one sidesnaps first, do not try to tear or cut the other side.Instead, keep compressing until the other side snaps.The piston ring can also be fractured by scoring andsnapping over a hard surface such as a table edge.Sawing or cutting is not recommended.
Remove any protective tape or covering from thevalve plug and stem assembly, and set it on a protec-tive surface. Then, place the piston ring in the pistonring groove with the fractured ends matched.
For a Design EHT valve (figure 21), install the sealring (key 8) onto the valve plug (key 3). Install the ringwith the open side facing the seat ring end of the valveplug for flow-down applications (view A of figure 21) orwith the open side facing the valve plug stem end ofthe valve plug for flow-up applications. Slide the back-up ring (key 9) onto the valve plug. Secure with the
retaining ring (key 10). For a 6-inch valve with a levelD Whisper Trim III cage, reinstall the piston ring (key30) following the instructions given in the paragraphimmediately preceding.
2. Install the valve plug into the cage.
TSO TrimTSO trim: 13/16 Inch Port Diameter (figure 6)
1. Thread the outer plug onto the inner plug until theparts seat metal to metal, using a strap wrench or sim-ilar tool that will not damage the outer plug guide sur-faces.
2. Mark the inner plug and outer plug with alignmentmarks in the assembled position.
3. Disassemble the outer plug from the inner plug andinstall the seal over the inner plug, so that the sealrests below the threaded area.
4. Thread the outer plug onto the inner plug and tight-en with a strap wrench or similar tool until the align-ment marks line up. This will ensure that the plug partsare metal to metal and the seal is compressed proper-ly. Do not damage the outer plug guide surfaces.
5. Drill through the inner plug with the proper size drillbit (same size as stem pinning) and install the pin.
TSO trim: 1-11/16 Inch Port Diameter (figure 7)
1. Thread the outer plug onto the inner plug until theparts seat metal to metal, using a strap wrench or sim-ilar tool that will not damage the outer plug guide sur-faces.
2. Mark the top of the outer plug and stem with align-ment marks in the assembled position.
3. Disassemble the outer plug from the inner plug andinstall the seal over the inner plug, so that the sealrests below the threaded area.
4. Thread the outer plug onto the inner plug and tight-en with a strap wrench or similar tool until the align-ment marks line up. This will ensure that the plug partsare metal to metal and the seal is compressed proper-ly. Do not damage the outer plug guide surfaces.
5. Install set screws centering the stem in the outerplug and torque to 8 lbf�ft.
6. Assemble the piston ring, anti-extrusion rings,backup ring, and retainer.
TSO trim: 2-11/16 Inch Port Diameter (figure 8)
1. Thread the outer plug onto the inner plug until theparts seat metal to metal, using a strap wrench or sim-
Design EH (1- through 8 x 6-Inch)
17
ilar tool that will not damage the outer plug guide sur-faces.
2. Mark the top of the inner plug and outer plug withalignment marks in the assembled position.
3. Disassemble the outer plug from the inner plug andinstall the seal over the inner plug, so that the sealrests below the threaded area.
4. Thread the outer plug onto the inner plug and tight-en with a strap wrench or similar tool until the align-ment marks line up. This will ensure that the plug partsare metal to metal and the seal is compressed proper-ly. Do not damage the outer plug guide surfaces.
5. Install set screws centering the inner plug in theouter plug and torque to 8 lbf�ft.
6. Assemble the piston ring, anti-extrusion rings,backup ring, and retainer.
All Constructions1. Install the top cage gasket (key 11) on the cage.
2. Install the bonnet over the valve stem and onto thevalve body.
Note
The prelubricated hex nuts (key 14, fig-ure 19, 20, or 21) referred to in step 7can be identified by a black film coatingon the nut threads.
The proper bolting procedures in step 7include—but are not limited to—ensur-ing that the bonnet stud threads areclean, and that the hex nuts are evenlytightened to the specified torque values.
CAUTION
Failure to comply with good bonnet-to-body bolting practices and the torquevalues shown in table 8 may result incage crushing, cage diameter reduction,and/or bonnet deformation. Cheaterbars or slug wrenches should not beused for this procedure.
Hot torquing is not recommended.
3. Lubricate the stud threads and the faces of the hexnuts (key 14, figure 19, 20, or 21) with Never-SeezPure Nickel Special lubricant or equivalent (not neces-sary 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 nomore than 1/4 of the nominal torque value specified intable 8. When all nuts are tightened to that torque val-ue, increase the torque by 1/4 of the specified nominaltorque and repeat the crisscross pattern. Repeat thisprocedure until all nuts are tightened to the specifiednominal value. Apply the final torque value again and,if any nut still turns, tighten every nut again.
4. Install new packing and packing box parts persteps 12 and 13 of the Replacing Packing procedure.Be certain to observe the note given prior to step 12 ofthat procedure.
5. Mount the actuator by following the procedures inthe actuator instruction manual. Check for packingleakage as the valve is being put into service. Retor-que the packing flange nuts as required (see table 7).
Retrofit: Installing C-seal Trim
Note
Additional actuator thrust is required fora valve with C-seal trim. When installingC-seal trim in an existing valve, contactyour Fisher Controls sales office orsales representative for assistance indetermining new actuator thrust require-ments.
Assemble the new valve plug/retainer assembly (withC-seal plug seal) using the following instructions:
CAUTION
To avoid leakage when the valve is re-turned to service, use appropriate meth-ods and materials to protect all sealingsurfaces of the new trim parts while as-sembling the individual parts and dur-ing installation in the valve body.
1. Apply a suitable high-temperature lubricant to theinside diameter of the C-seal plug seal. Also, lubricatethe outside diameter of the valve plug where theC-seal plug seal must be pressed into the proper seal-ing position (figure 11).
2. Orient the C-seal plug seal for correct sealing ac-tion based on the process fluid flow direction throughthe valve.
� The open interior of the C-seal plug seal mustface up in a valve with flow-up construction (figure 11).
� The open interior of the C-seal plug seal mustface down in a valve with flow-down construction (fig-ure 11).
Design EH (1- through 8 x 6-Inch)
18
Figure 11. Design EHD with C-seal Trim
FLOW DOWN FLOW UP
������
37B1047-A / IL
Note
An installation tool must be used toproperly position the C-seal plug sealon the valve plug. A tool is available asa spare part from Fisher Controls or atool could be manufactured followingthe dimensions given in figure 12.
3. Place the C-seal plug seal over the top of the valveplug and press the C-seal plug seal onto the plug us-ing the C-seal installation tool. Carefully press theC-seal plug seal onto the plug until the installation toolcontacts the horizontal reference surface of the valveplug (figure 13).
4. Apply a suitable high-temperature lubricant to thethreads on the plug. Then, place the C-seal retaineronto the plug and tighten the retainer using an ap-propriate tool such as a strap wrench.
5. Using an appropriate tool such as a center punch,stake the threads on top of the plug in one place (fig-ure 14) to secure the C-seal retainer.
6. Install the new plug/retainer assembly with C-sealplug seal on the new stem following the appropriateinstructions in the Trim Replacement section of thismanual.
7. Install piston rings by following instructions in the Trim Replacement section of this manual.
8. Remove the existing valve actuator and bonnetfollowing the appropriate instructions in the ReplacingPacking section of this manual.
CAUTION
Do not remove the existing valve stemfrom the valve plug unless you are plan-ning to replace the valve stem.
Never reuse an old valve stem with anew plug or reinstall a valve stem after ithas been removed. Replacing a valvestem requires drilling a new pin hole inthe stem. This drilling weakens the stemand may cause failure in service. How-ever, a used valve plug may be reusedwith a new valve stem.
9. Remove the existing valve stem and plug, cage,and seat ring from the valve body following the ap-propriate instructions in the Trim Removal section ofthis manual.
10. Replace all gaskets according to appropriateinstructions in the Trim Replacement section of thismanual.
11. Install the new seat ring, cage, valve plug/retainerassembly, and stem into the valve body and complete-ly reassemble the valve package following the ap-propriate instructions in the Trim Replacement sectionof this manual.
To avoid excessive leakage and seaterosion, the valve plug must be initiallyseated with sufficient force to overcomethe resistance of the C-seal plug sealand contact the seat ring. You can cor-rectly seat the valve plug by using thesame force calculated for full load whensizing your actuator. With no pressuredrop through the valve, this force willadequately drive the valve plug to theseat ring, thus giving the C-seal plugseal a predetermined permanent set.Once this is done, the plug/retainer as-
sembly, the cage, and the seat ring be-come a matched set.
With full actuator force applied and thevalve plug fully seated, align the actua-tor travel indicator scale with the lowerend of valve travel. Refer to the ap-propriate actuator instruction manualfor information on this procedure.
Replacement of Installed C-seal Trim
Trim Removal (C-seal Constructions)1. Remove the valve actuator and bonnet followingthe appropriate instructions in the Replacing Packingsection of this manual.
Design EH (1- through 8 x 6-Inch)
20
Figure 13. Installing the C-seal Plug Seal Using the Installation Tool
NOTE:PRESS INSTALLATION TOOL OVER VALVE PLUG UNTIL THE TOOLCONTACTS THE HORIZONTAL REFERENCE SURFACE OF THE VALVEPLUG.
C-sealMETALPLUGSEAL
INSTALLATIONTOOL
A6778 / IL
VALVEPLUG
HORIZONTALREFERENCESURFACE
���������
CAUTION
To avoid leakage when the valve is re-turned to service, use appropriate meth-ods and materials to protect all sealingsurfaces of the trim parts during mainte-nance.
Use caution when removing pistonring(s) and C-seal plug seal to avoidscratching any sealing surface.
CAUTION
Do not remove the valve stem from theplug/retainer assembly unless you areplanning to replace the valve stem.
Never reuse an old valve stem with anew plug or reinstall a valve stem after ithas been removed. Replacing a valvestem requires drilling a new pin hole inthe stem. This drilling weakens the stemand may cause failure in service. How-ever, a used valve plug may be reusedwith a new valve stem.
Figure 14. Stake the Threads of the C-seal Retainer
C-sealMETALPLUGSEAL VALVE
PLUG
���������
PISTONRING
RETAINER
DEFORM THREAD TOSTAKE C-seal RETAINER
A6779 / IL
2. Remove the plug/retainer assembly (with C-sealplug seal), cage, and seat ring from the valve bodyfollowing the appropriate instructions in the TrimRemoval section of this manual.
3. Locate the staked thread on top of the valve plug(figure 14). The staked thread secures the retainer.Use a drill with a 1/8-inch bit to drill out the stakedarea of the thread. Drill approximately 1/8-inch into themetal to remove the staking.
4. Locate the break between sections of the pistonring(s). Using an appropriate tool such as a flat-bladescrewdriver, carefully pry out the piston ring(s) fromthe groove(s) in the C-seal retainer.
5. After removing the piston ring(s), locate the0.25-inch diameter hole in the groove. In a retainerwith two piston ring grooves, the hole will be found inthe upper groove.
6. Select an appropriate tool such as a punch andplace the tip of the tool into the hole with the body ofthe tool held tangent to the outside diameter of theretainer. Strike the tool with a hammer to rotate theretainer and free it from the valve plug. Remove theretainer from the plug.
7. Use an appropriate tool such as a flat-blade screw-driver to pry the C-seal plug seal off the plug. Use cau-tion to avoid scratches or other damage to the sealingsurfaces where the C-seal plug seal makes contactwith the valve plug (figure 15).
8. Inspect the lower seating surface where the valveplug contacts the seat ring for wear or damage which
Design EH (1- through 8 x 6-Inch)
21
Figure 15. Lower (Valve Plug to Seat Ring) and Upper (C-sealPlug Seal to Cage) Seating Surfaces
C-seal METALPLUG SEAL
RETAINER
CAGEVALVE PLUG
NOTE: UPPER SEATING SURFACE IS THE AREA OFCONTACT BETWEEN THE C-seal METAL PLUGSEAL AND THE CAGE.
PLUG
CAGE
SEATRING
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A6780 / IL
1
1
would prevent proper operation of the valve. Also, in-spect the upper seating surface inside the cage wherethe C-seal plug seal contacts the cage, and inspectthe sealing surface where the C-seal plug seal makescontact with the plug (figure 15).
9. Replace or repair trim parts according to the follow-ing procedure for lapping metal seats, remachiningmetal seats, or other valve plug maintenance proce-dures as appropriate.
Lapping Metal Seats (C-sealConstructions)Before installing a new C-seal plug seal, lap the lowerseating surface (valve plug to seat ring, figure 15) fol-lowing appropriate procedures in the Lapping Seatssection of this manual.
Remachining Metal Seats (C-sealConstructions)See figure 16. A valve plug with a C-seal metal plugseal features two seating surfaces. One seating sur-face is found where the valve plug contacts the seatring. The second seating surface is found where the
Figure 16. Example of Machining the Lower (Valve Plug toSeat Ring) and Upper (C-seal Plug Seal to Cage)
Seating Surfaces
UPPER SEATINGSURFACE
0.020 INCH(4)
0.010 INCH(4)
0.010 INCH(4)
C-sealRETAINER
MACHINING OF THE UPPERSEATING SURFACE MUSTEQUAL THE TOTAL MACHININGOF THE LOWER SEATING SUR-FACE (PLUG PLUS SEAT RING).IF NOT, THE RETAINER MAYSTRIKE THE UPPER SEATINGSURFACE BEFORE THE VALVEPLUG PROPERLY SEATS ONTHE LOWER SEATING SUR-FACE.
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REMOVAL OF 0.010 INCH FROM THE VALVE PLUGPLUS REMOVAL OF 0.010 INCH FROM THE SEAT RING
MUST EQUAL REMOVAL OF 0.020 INCH FROM THE UP-PER SEATING SURFACE IN THE CAGE4. THESE VALUES ARE FOR EXAMPLE ONLY. REMOVEONLY THE MINIMUM AMOUNT OF MATERIAL REQUIREDTO REFURBISH THE SEATS.
SEATRING
PLUG
CAGE
A6781 / IL
1
3
2
123
NOTE:
C-seal plug seal contacts the upper seating surface inthe cage. If you machine the seats on the seat ringand/or plug, you must machine an equal dimensionfrom the seating area in the cage.
CAUTION
If metal is removed from the seat ringand plug and a corresponding amountis not removed from the cage seatingarea, the C-seal plug seal will becrushed as the valve closes and theC-seal retainer will strike the seatingarea of the cage, preventing the valvefrom closing.
Design EH (1- through 8 x 6-Inch)
22
Trim Replacement (C-seal Constructions)1. Apply a suitable high-temperature lubricant to theinside diameter of the C-seal plug seal. Also, lubricatethe outside diameter of the valve plug where theC-seal plug seal must be pressed into the proper seal-ing position (figure 11).
2. Orient the C-seal plug seal for correct sealing ac-tion based on the process fluid flow direction throughthe valve.
� The open interior of the C-seal plug seal mustface up in a valve with flow-up construction (figure 11).
� The open interior of the C-seal plug seal mustface down in a valve with flow-down construction (fig-ure 11).
Note
An installation tool must be used toproperly position the C-seal plug sealon the valve plug. A tool is available asa spare part from Fisher Controls or atool could be manufactured followingthe dimensions given in figure 12.
3. Place the C-seal plug seal over the top of the valveplug and press it onto the plug using the installationtool. Carefully press the C-seal plug seal onto the pluguntil the installation tool contacts the horizontal refer-ence surface of the valve plug (figure 13).
4. Apply a suitable high-temperature lubricant to thethreads on the plug. Then, place the C-seal retaineronto the plug and tighten the retainer using an ap-propriate tool such as a strap wrench.
5. Using an appropriate tool such as a center punch,stake the threads on top of the plug in one place (fig-ure 14) to secure the C-seal retainer.
6. Replace the piston ring(s) following instructions inthe Trim Replacement section of this manual.
7. Return the seat ring, cage, plug/retainer assembly,and stem to the valve body and completely reas-semble the valve package following the appropriateinstructions in the Trim Replacement section of thismanual.
CAUTION
To avoid excessive leakage and seaterosion, the valve plug must be initiallyseated with sufficient force to overcomethe resistance of the C-seal plug sealand contact the seat ring. You can cor-rectly seat the valve plug by using thesame force calculated for full load whensizing your actuator. With no pressuredrop through the valve, this force willadequately drive the valve plug to theseat ring, thus giving the C-seal plugseal a predetermined permanent set.Once this is done, the plug/retainer as-sembly, the cage, and the seat ring be-come a matched set.
With full actuator force applied and thevalve plug fully seated, align the actua-tor travel indicator scale with the lowerend of valve travel. Refer to the ap-propriate actuator instruction manualfor information on this procedure.
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Each body-bonnet assembly is assigned a serial num-ber, which can be found on the valve body. This samenumber also appears on the actuator nameplate whenthe valve body is shipped from the factory as part of acontrol valve assembly. Refer to the number whencontacting your Fisher Controls sales office or salesrepresentative for technical assistance or when order-ing replacement parts.
When ordering replacement parts, also be sure to in-clude the 11-character part number for each part re-quired from the following parts list.
Design EH (1- through 8 x 6-Inch)
23
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Stem Diameter, Inches (mm)Yoke Boss Diameter, Inches (mm)
1-1/4 in. (31.8 mm) stem diameterPl steel 1A3681 24112316 stainless steel 1A3681 35252Steel, for NACE MR0175 1A3681 X0042
6* Packing Set or Arrangement See following table7* Packing Ring, low chloride graphite See following table8 Packing Spring, 316 stainless steel See following table8 Lantern Ring, 316 stainless steel See following table
10 Special Washer, 316 stainless steel See following table11* Packing Box Ring, 316 stainless steel See following table12* Upper Wiper, felt See table following13 Packing Follower, 316 stainless steel See table following14 Pipe Plug
1-1/4 inch (31.8 mm) stem diameterPl steel A194-2H5-inch (127 mm) yoke boss diameter 1A3433 24112
35 Retaining Ring, for use withextension bonnet only See following table
Valve Body (figures 19-22)1 Valve Body, order by valve size, serial
number, and desired material2* Cage See following tables3* Valve Plug See following tables4* Valve Plug Stem See following tables5* Pin See following table6* Seat Ring See following tables7* Seat Ring Retainer See following tables8* Piston Ring or Seal Ring See following tables9* Backup Ring See following tables
10* Retaining Ring See following table10* Retaining Ring (for Design EHT valve
body only) See following table11* Cage Gasket (2 req’d) See following table12* Seat Ring O-Ring or Gasket See following table
Key Description Part Number13 Bonnet Stud (8 req’d) See following table14 Hex Nut (8 req’d) See following table15 Flow Arrow, stainless steel
For all valve bodies except those withWhisper Trim III cage1, 1-1/2 x 1, 2 x 1, 2, & 3 x 2-inch valves 1V1059 389823, 4 x 3, 4, 6 x 4, 6, & 8 x 6-inch valves 1V1060 38982
For all valves with Whisper Trim III cage 1V1060 3898216 Drive Screw, stainless steel (4 req’d) 1A3682 2898224 Never Seez Nickel Special Lubricant,
8 pound (3.6 kg) can (not furnishedwith the valve body) 1M5539 X0012
25 Seat Ring Retainer Tool (not shown),416 stainless steelClass 1500 valve body rating1, 1-1/2 x 1, & 2 x 1-inch valves 26A5130 X0122 & 3 x 2-inch valves 26A5321 X0123 & 4 x 3-inch valves 26A5391 X0124 & 6 x 4-inch valves 26A5392 X0126 & 8 x 6-inch valves 26A5468 X012
Class 2500 valve body rating1, 1-1/2 x 1 & 2 x 1-inch valves 26A5469 X0122 & 3 x 2-inch valves 26A5495 X0123 & 4 x 3-inch valves 26A5496 X0124 & 6 x 4-inch valves 26A5497 X0126 & 8 x 6-inch valves 26A5498 X012
*Recommended spare parts
Design EH (1- through 8 x 6-Inch)
25
Figure 18. Typical HIGH-SEAL Packing Arrangement32B5856-B / IL
� APPLY LUB
Key Description Part Number26* O-Ring (for valve with Cavitrol III
trim only), ethylene/propylene See following table27 Nameplate, stainless steel 18A5087 X0A228 Nameplate Wire 1D8847 9901229 Bonnet Washer, for 6-inch valve only
Class 2500Steel 18A8861 X012416 stainless steel 18A8861 X022
30* Piston Ring (for Design EHT with Level DWhisper Trim III cage only) See following table
63* Anti-Extrusion Ring See following table
Key Description Part Number
C-seal Trim (figure 11)2* Cage see following table3* Valve Plug/Retainer see following table4* Valve Plug Stem, Nitronic 50 see following table6* Seat Ring see following table8* Piston Ring, graphite (2 req’d) see following table64* C-seal, Inconel see following table
TSO Trim (figures 6, 7, and 8)2* Cage See following table4* Seat Ring See following table5* Plug/Stem Assembly See following table8* Seal Ring See following table63* Anti-Extrusion Ring See following table9* Back Up Ring See following table10* Retaining Ring See following table
*Recommended spare parts
Design EH (1- through 8 x 6-Inch)
26
Figure 19. Design EHD Valve
FLOW DIRECTION FOR ALL TRIMS EXCEPT WITH A WHISPERTRIM III CAGE OR A VALVE PLUG WITH DIVERTER CONE
VIEW A
� APPLY LUB
56A5372-E / IL
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59A9166-A / IL 57A2887-A / IL 59A9188-A / IL 59A9190-A / IL
Design EH (1- through 8 x 6-Inch)
27
Figure 20. Design EHS Valve
FLOW DIRECTION FOR ALL TRIMS EXCEPT THOSE WITH A CAVITROL III CAGE
VIEW A
� APPLY LUB
56A5494-E / IL
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38A2264-A / IL 38A2264-A / IL 57A2891-B / IL 57A2881-B / IL
Design EH (1- through 8 x 6-Inch)
28
Figure 21. Design EHT Valve
FLOW DIRECTION FOR ALL TRIMS EXCEPT WITH A WHISPERTRIM III CAGE OR A VALVE PLUG WITH DIVERTER CONE
1. These materials are listed in NACE Standard MR0175 as being acceptable for direct exposure to sour environment when used under conditions stated in that standard.2. Flow down only with Design EHD and EHT style of valve plug. For flow up with balanced valve plug, contact factory.
Key 2* Cage or Cage and Baffle Assembly for Valve Body with Whisper Trim III Cage
1. See table 12 for plug diameters vs operating temperatures.
*Recommended spare parts
Design EH (1- through 8 x 6-Inch)
34
Table 12. Valve Plug Diameters and Operating Temperatures
CageMaterial
StemMaterial
Operating TemperatureRange, �F (�C)
DiameterCode
Valve BodyDesign
S31600 (316 Stainless S31600 –325 to +800 –198 to +427A EHD EHS
S31600 (316 StainlessSteel) Electrolized S31600 Electrolized –20 to +1100 –29 to +593
A EHD, EHS
S31600 ENC (NACE) S20910 (Nitronic 50) –40 to +450 –40 to +232 A EHD, EHS
S17400 (17-4PH Stain-less Steel) H1150 (NACE)
S20910 –40 to +450 –40 to +232 A EHS
S17400 H1150 (NACE) S20910 –40 to +450 –40 to +232 B EHD
S31600 ElectrolizedS31600 –325 to +800 –198 to +427
B EHSS31600 ElectrolizedS31600 Electrolized –20 to +1100 –29 to +593
B EHS
S31600 ENC (NACE) S20910 –40 to +450 –40 to +232 B EHS
S42200 (422 StainlessSteel) Ion Nitride
S31600 Electrolized +800 to 1050 427 to 566 C EHD, EHS
S42200 Ion Nitride S31600 Electrolized +800 to 1050(1) 427 to 566 D EHD, EHS
S31600 ElectrolizedS31600 –325 to +800 –198 to +427
D EHD EHSS31600 ElectrolizedS31600 Electrolized –20 to +1100 –29 to +593
D EHD, EHS
S31600 ENC (NACE) S20910 –40 to +450 –40 to +232 D EHD, EHS
S42200 Ion Nitride S31600 Electrolized +800 to 1050(2)(3) 427 to 566 E EHD, EHS
S42200 Ion Nitride S31600 Electrolized +800 to 1050(4) 427 to 566 F EHD, EHS
S31600 ElectrolizedS31600 –325 to +800 –198 to +427
K EHDS31600 ElectrolizedS31600 Electrolized –20 to +1100 –29 to +593
K EHD
S31600 ENC (NACE) S20910 –40 to +450 –40 to +232 K EHD1. Temperature limited to +800� to 950�F (427� to 510�C) for 6 and 8 x 6-inch Class 2500.2. Temperature limited to +800� to 950�F (427� to 510�C) for 6 and 8 x 6-inch Class 1500.3. Temperature limited to 950� to 1050�F (510� to 566�C) for 6 and 8 x 6-inch Class 2500.4. Temperature limited to 950� to 1050�F (510� to 566�C) for 6 and 8 x 6-inch Class 1500.
Key 3* Valve Plug for 1, 1-1/2 x 1, and 2 x 1 Design EHS Valve Body with Micro-Flute Valve Plug
1. See table 12 for plug diameters vs operating temperatures.
*Recommended spare parts
Design EH (1- through 8 x 6-Inch)
35
Key 3* Valve Plug or Plug Diverter for a 2 through 4-Inch Class 1500 Valve Without Micro-Form, Micro-Flute, or Cavitrol III Trim.Also for Use with a 2 or 3-Inch Valve with a Whisper Trim III Cage
1. See table 12 for plug diameters vs operating temperatures.2. Temperature limit due to plug/cage diametrical expansion 800� to 950�F (427� to 510�C).3. Temperature limit due to plug/cage diametrical expansion 950� to 1050�F (510� to 566�C).4. Flow up only.
*Recommended spare parts
Design EH (1- through 8 x 6-Inch)
36
Key 3* Valve Plug or Plug/Diverter for a 2 through 4-Inch Class 2500 Valve Without Micro-Form, Micro-Flute, orCavitrol III Trim. Also for Use With a 2 or 3-Inch Valve With a Whisper Trim III Cage
1. See table 12 for plug diameters vs operating temperatures.2. Temperature limit due to diametrical expansion 800� to 950�F (427� to 510�C).3. Temperature limit due to diametrical expansion 950� to 1050�F (510� to 566�C).4. Flow up only.
*Recommended spare parts
Design EH (1- through 8 x 6-Inch)
37
Key 3* Valve Plug for 4-Inch and 6 x 4-Inch Valve With Whisper Trim III Cage
�Fisher Controls International, Inc. 1981, 1998; All Rights Reserved
C-seal is a mark owned by Pressure Science, Inc. Cavitrol, Fisher, Fisher-Rosemount, HIGH-SEAL, Managing The Process Better, Micro-Flute, Micro-Form, and Whisper Trim are marksowned by Fisher Controls International, Inc. or Fisher-Rosemount Systems, Inc. All other marks are the property of their respective owners.This product may be covered by one or more of the following patents: 5,129,625; 5,131,666; 5,056,757; 5,230,498; and 5,299,812 or under pending patents.