Instruction Manual
D103211X012
Fisher™ NotchFlo™ DST Control Valve
NotchFlo DST Valve
August 2020
Contents
Introduction 1.................................
Scope of Manual 1.............................
Description 1.................................
Specifications 2...............................
Educational Services 4.........................
Installation 4..................................
Maintenance 5.................................
Packing Maintenance 8.........................
Adding Packing Rings 9.....................
Replacing Packing 10.......................
Trim Removal 13..............................
Valve Plug Maintenance 13.....................
Lapping Seats 14..............................
Trim Replacement 15..........................
Parts Ordering 17...............................
Parts Kits 17...................................
Gasket Kits 19.................................
Parts List 21...................................
Introduction
Figure 1. Fisher NotchFlo DST Control Valve
W9050-2
Scope of Manual
This instruction manual includes installation, maintenance, and parts information for the Fisher NotchFlo DST control
valve. Refer to separate manuals for instructions covering the actuator, positioner, and accessories.
Do not install, operate, or maintain NotchFlo DST 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
before proceeding.
Description
The NotchFlo DST globe (figure 1) and angle valves have metal seats, cage guiding, quick change trim, and
push‐down‐to‐close valve plug action. All available valve sizes and pressure ratings use balanced valve plugs with the
exception of CL900 and CL1500 (NPS 1 and 1‐1/2 valves) which use an unbalanced valve plug. To provide a seal
between the cage and a balanced valve plug, the balanced valve plugs use a pressure‐assisted spring‐loaded seal ring.
A properly sized NotchFlo DST valve with 3‐, 4‐, or 6‐stage dirty service anti‐cavitation trim (figure 2) offers excellent
control of high pressure drop liquids with entrained solids, while avoiding the damaging effects of cavitation and
erosive solids.
www.Fisher.com
NotchFlo DST Valve
August 2020
Table 1. Specifications
Instruction Manual
D103211X012
Available Valves
CL600 3‐Stage: Level C only
CL900 and CL1500 v NPS 4, 4‐Stage: Levels A, B, and
(1)
C
Shutoff Classification
Class V: [5x10
(0.0005 mL/min/psid/in) of water at service pressure
drop] per ANSI/FCI 70‐2 and IEC 60534‐4
CL1500 w NPS 6, 4‐Stage: Level C only
CL1500 6‐Stage: Level C only
CL2500 6‐Stage: Level C only
End Connection Styles and Ratings
(2)
Flow Characteristic
Linear
Flanged: Consistent with CL600, 900, 1500, and 2500
per ASME B16.34
Socket Welding: Consistent with CL600, 900, 1500,
and 2500 per ASME B16.34
Buttwelding: Consistent with CL600, 900, 1500, and
2500 per ASME B16.34
Also see table 2
1. Levels A, B, and C provide for varied pressure drops and capacity.
2. The pressure/temperature limits in this manual and any applicable standard or code limitation for valve should not be exceeded.
Flow Direction
Flow up
Approximate Weights
See table 2
Figure 2. Fisher NotchFlo DST Trim
-12m3
/sec/bar/mm of port diameter
W8538-1
NotchFlo DST control valves utilize a high resistance, multi‐stage, axial flow path (or passage) where fluid flow is
parallel to the axis of the plug and cage.
Pressure reduction occurs throughout the length of the plug; thus individual stages aren't exposed to the full pressure
differential. Therefore, trim life is enhanced.
NotchFlo DST trim utilizes a series of notched flow restrictions and expansions to control the pressure drop of the fluid.
The amount of pressure drop per stage is controlled to prevent cavitation problems and minimize erosion issues.
Flow passage configuration provided by the multi‐stage plug and cage design make the NotchFlo DST valves
well‐suited for applications involving fluids with entrained particles. This is a potentially serious problem for other
anti‐cavitation valve designs which are subject to clogged flow passages. Design of the trim allows for high
rangeability.
Specifications
Specifications for NotchFlo DST valves are shown in table 1.
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D103211X012
Table 2. Approximate Weights (Valve and Bonnet Assemblies)
VALVE DESIGN
3-Stage Angle Valves
3-Stage Globe Valves
4-Stage Angle Valves
4-Stage Cast Angle Valves
4-Stage Globe Valves
VALVE SIZE,
NPS
1
2 42 - - - 93 - - 3 86 - - - 190 - - 4 140 - - - 315 - - 6 300 - - - 660 - - 8 605 - - - 1340 - - 1
2 40 30 90 70
3 70 50 155 110
4 120 80 265 175
6 275 230 610 510
8 510 445 1130 980
1
1-1/2 55 45 120 95
2 95 95 210 210
3 185 - - - 405 - - 4 285 - - - 625 - - 6 560 - - - 1230 - - -
8 1260 - - - 2770 - - -
1
1-1/2 43 35 95 77
2 75 57 165 126
3 148 118 326 260
4 243 200 536 441
6 523 443 1153 977
8 1062 920 2342 2029
1
1-1/2 75 48 165 106
2 95 85 210 185
3 185 140 405 310
4 340 280 750 620
PRESSURE
RATING
CL600
CL600
CL900 and
CL1500
CL900 and
CL1500
CL900 and
CL1500
-continued-
NotchFlo DST Valve
KILOGRAMS POUNDS
Flanged
20 - - - 44 - - -
20 15 45 35
50 40 110 90
40 32 88 71
58 42 128 93
Socket Weld
Butt Weld,
Screwed
,
Flanged
(2)
Socket Weld
August 2020
Butt Weld,
(2)
Screwed
,
3
NotchFlo DST Valve
(1)
(1)
August 2020
Table 2. Approximate Weights (Valve and Bonnet Assemblies) (cont.)
VALVE DESIGN
6-Stage Angle Valves
6-Stage Cast Angle Valves
6-Stage Globe Valves
1. SWE available on NPS 1, 1-1/2, and 2 only.
2. Screwed end available on NPS 1 and 2 CL600 only.
VALVE SIZE,
NPS
1
2 180 170 405 375
3 500 473 1110 1043
4 465 433 1025 955
6 1060 1030 2330 2271
1
2 135 108 298 238
3 352 293 776 646
4 385 300 849 662
6 921 692 2031 1526
1
2 98 84 217 186
3 354 307 781 677
4 406 386 896 852
6 975 866 2149 1909
1
2 130 - - - 287 - - 3 321 - - - 708 - - 4 427 - - - 942 - - -
6 1026 - - - 2262 - - -
PRESSURE
RATING
CL2500
CL2500
CL1500
CL2500
Instruction Manual
KILOGRAMS POUNDS
Flanged
64 67 140 148
50 42 110 93
47 43 103 94
53 - - - 117 - - -
Socket Weld
Butt Weld,
Screwed
,
Flanged
(2)
Socket Weld
D103211X012
Butt Weld,
Screwed
,
(2)
Educational Services
For information on available courses for Fisher NotchFlo DST valves, as well as a variety of other products, contact:
Emerson Automation Solutions
Educational Services - Registration
Phone: 1-641-754-3771 or 1-800-338-8158
E-mail: education@emerson.com
emerson.com/fishervalvetraining
Installation
WARNING
Always wear protective gloves, clothing, and eyewear when performing any installation operations to avoid personal
injury.
Personal injury or property damage caused by sudden release of pressure may result if the valve assembly is installed where
service conditions could exceed the limits given in table 1 or on the appropriate nameplates. To avoid such injury or
damage, provide a relief valve for over‐pressure protection as required by government or accepted industry codes and
good engineering practices.
Check with your process or safety engineer for any additional measures that must be taken to protect against process
media.
If installing into an existing application, also refer to the WARNING at the beginning of the Maintenance section in this
instruction manual.
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NotchFlo DST Valve
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WARNING
Some bonnet flanges have a tapped hole that was used to handle the bonnet during manufacture. Since this tapped hole
was not designed or intended to support the weight of the valve/bonnet assembly, do not use this tapped hole to lift the
valve assembly or personal injury may result from the assembly falling.
CAUTION
When ordered, the valve configuration and construction materials were selected to meet particular pressure, temperature,
pressure drop, and controlled fluid conditions. Since some body/trim material combinations are limited in their pressure
drop and temperature ranges, do not apply any other conditions to the valve without first checking with your Emerson
sales office.
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.
3. Flow through the valve must be in the direction indicated by the flow arrow, which is cast on or attached to the
valve body.
4. Use accepted piping practices when installing the valve in the pipeline. For flanged valve bodies, use a suitable
gasket between the body and pipeline flanges.
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 body was shipped without packing installed in the packing box, install the packing before putting the
valve body into service. Refer to instructions given in the Packing Maintenance procedure.
WARNING
Personal injury could result from packing leakage. Valve packing was tightened prior to shipment; however, the packing
might require some readjustment to meet specific service conditions. Check with your process or safety engineer for any
additional measures that must be taken to protect against process media.
Maintenance
Refer to figure 10 through 19.
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 maintenance
and trim maintenance. All maintenance operations may be performed with the valve in the line.
WARNING
Avoid personal injury or damage to property from sudden release of pressure or uncontrolled process fluid. Before starting
disassembly:
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.
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Instruction Manual
D103211X012
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.
Figure 3. PTFE V‐Ring Packing Arrangements for Plain and Extension Bonnets
UPPER WIPER
(KEY 27)
PACKING
FOLLOWER (KEY 28)
SPACER (KEY 24)
PACKING BOX
RING (KEY 26)
12A7837‐A
B1429‐5
UPPER WIPER
(KEY 27)
PACKING
FOLLOWER
(KEY 28)
WASHER
(KEY 25)
SPRING
(KEY 24)
PACKING BOX
RING (KEY 26)
FOR 316 SST
METAL PACKING BOX PARTS
NOTE:
1
AND LOWER WIPER ARE PART OF PACKING SET (KEY 22).
2 REQ'D FOR DOUBLE ARRANGEMENTS, EXCEPT LOWER WIPER.
MALE ADAPTOR, PACKING RING, FEMALE ADAPTOR,
FEMALE
ADAPTOR
PACKING
RING
MALE
ADAPTOR
LOWER
WIPER
FEMALE
1
1
1
1
1
ADAPTOR
1
PACKING RING
1
MALE
ADAPTOR
1
SINGLE ARRANGEMENTS
LOWER
WIPER
FOR ALL OTHER METAL PACKING
BOX PART MATERIALS
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Instruction Manual
D103211X012
NotchFlo DST Valve
August 2020
Figure 4. Detail of Graphite Ribbon/Filament Packing
for Plain and Extension Bonnets
1
13A9775‐B
12.7 mm
(1/2 INCH)
STEM
1
13A9776‐B
19.1 & 25.4 mm
(3/4 & 1 INCH)
STEM
PACKING
FOLLOWER
(KEY 28)
GRAPHITE
RIBBON
PACKING RING
(KEY 23)
GRAPHITE
FILAMENT
PACKING RING
(KEY 23)
LANTERN
RING (KEY 24)
PACKING BOX
RING (KEY 26)
Figure 5. Detail of Graphite ULF Packing for Plain
Bonnets
SINGLE ARRANGEMENTS
NOTE:
1
0.102 mm (0.004 INCH) THICK SACRIFICIAL ZINC WASHERS;
USE ONLY ONE BELOW EACH GRAPHITE RIBBON RING.
39B9286‐A
SINGLE ARRANGEMENTS
Table 3. CL600 Recommended Torque for Packing Flange Nuts (non live‐loaded)
VALVE STEM DIAMETER
mm Inches NSm LbfSin NSm LbfSin NSm LbfSin NSm LbfSin
PRESSURE
RATING
Minimum Torque Maximum Torque Minimum Torque Maximum Torque
12.7 1/2 CL600 9 81 14 122 4 39 7 58
19.1 3/4 CL600 21 182 31 274 10 87 15 131
25.4 1 CL600 35 310 53 466 17 149 25 223
GRAPHITE TYPE PACKING PTFE TYPE PACKING
Table 4. CL900, 1500, and 2500 Recommended Torque for Packing Flange Nuts (non live‐loaded)
VALVE STEM
DIAMETER
PRESSURE RATING
NSm lbfSft
mm Inches Min Max Min Max
CL900 12 18 9 13
12.7 1/2
CL1500 15 22 11 16
CL2500 18 24 13 18
CL900 27 41 20 30
19.1 3/4
CL1500 34 50 25 37
CL2500 41 61 30 45
CL900 42 62 31 46
25.4 1
CL1500 52 77 38 57
CL2500 61 91 45 67
31.8 1‐1/4
CL900 56 83 41 61
CL1500 68 102 50 75
TORQUE
CAUTION
The NotchFlo DST valve uses spiral‐wound gaskets which are crushed to provide their seal. A spiral‐wound gasket should
never be reused. Whenever a gasket seal is disturbed by removing or shifting gasketed parts, a new gasket must be
installed upon reassembly. This is necessary to ensure a good gasket seal, since the used gasket will not seal properly.
The spiral‐wound gaskets are of special design. Failure to use genuine Fisher replacement parts may result in valve damage
and/or failure.
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NotchFlo DST Valve
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(1,4)
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Instruction Manual
D103211X012
Packing Maintenance
Key numbers refer to figure 3 for PTFE V‐ring packing and to figure 4 and 5 for graphite ribbon/filament and graphite
ULF packing, unless otherwise indicated.
WARNING
To avoid personal injury or equipment damage resulting from packing leakage, inspect the valve plug stem and packing box
wall for nicks or scratches while performing the following procedures.
Use care to avoid damaging these surfaces.
For spring‐loaded single PTFE V‐ring packing, the spring (key 24) maintains a sealing force on the packing. If leakage is
noted around the packing follower (key 28), check to be sure the shoulder on the packing follower is touching the
bonnet. If the shoulder is not touching the bonnet, tighten the packing flange nuts (key 21, figure 10 through 19) until
the shoulder is against the bonnet. If leakage cannot be stopped in this manner, proceed to the Replacing Packing
procedure.
Table 5. Torque for Body‐to‐Bonnet Bolting Using Anti‐Seize Lubricant for CL600 Fisher NotchFlo DST Valves
VALVE
RATING
CL600
1. Determined from laboratory tests.
2. SA193‐B8M annealed.
3. SA193‐B8M strain hardened.
4. For other materials and torques contact your Emerson sales office
VALVE SIZE, NPS
1 122 90 61 45
2 91 67 43 32
3 163 120 84 62
4 258 190 149 110
6 712 525 ‐ ‐ ‐ ‐ ‐ ‐
8 522 385 ‐ ‐ ‐ ‐ ‐ ‐
SA193‐B7, SA193‐B8M Class 2
NSm LbfSft NSm LbfSft
.
BOLT TORQUES
SA193‐B8M Class 1
Table 6. Torque for Body‐to‐Bonnet Bolting Using Anti‐Seize Lubricant for CL900 and CL1500,
Fisher NotchFlo DST Valves
VALVE
RATING
CL900 & 1500 4-stage
CL1500 6-stage
1. Determined from laboratory tests.
2. SA193‐B8M annealed.
3. SA193‐B8M strain hardened.
4. For other materials and torques contact your Emerson sales office
TRIM
VALVE SIZE,
NPS
1 or 1‐1/2 258 190 149 110
2 373 275 237 175
3 712 525 509 375
4 942 695 705 520
6 2671 1970 ‐ ‐ ‐ ‐ ‐ ‐
8 2671 1970 ‐ ‐ ‐ ‐ ‐ ‐
1 258 190 149 110
2 373 275 237 175
3 2129 1570 ‐ ‐ ‐ ‐ ‐ ‐
4 2671 1970 ‐ ‐ ‐ ‐ ‐ ‐
6 2671 1970 ‐ ‐ ‐ ‐ ‐ ‐
SA193‐B7, SA193‐B8M Class 2
NSm LbfSft NSm LbfSft
.
BOLT TORQUES
SA193‐B8M Class 1
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Instruction Manual
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NotchFlo DST Valve
August 2020
Table 7. Torque for Body‐to‐Bonnet Bolting Using Anti‐Seize Lubricant for CL2500 Fisher NotchFlo DST Valves
VALVE RATING
CL2500
1. Determined from laboratory tests.
2. For other materials and torques contact your Emerson sales office.
VALVE SIZE
NPS NSm lbfSft
1 373 275
2 712 525
3 2129 1570
4 2671 1970
6 2671 1970
BOLT TORQUES
SA193‐B7, SA193‐B7M
Table 8. Valve Stem Connection Torque and Hole Size for Pin
VALVE STEM DIAMETER TORQUE, MINIMUM TO MAXIMUM HOLE SIZE
mm Inches NSm LbfSft mm Inch
12.7
19.1
25.4
31.8
1/2
3/4
1
1‐1/4
81‐115
237‐339
420‐481
827‐908
60‐85
175‐250
310‐355
610‐670
3.20 ‐ 3.25
4.80 ‐ 4.88
6.38 ‐ 6.45
6.38 ‐ 6.45
0.126 ‐ 0.128
0.189 ‐ 0.192
0.251 ‐ 0.254
0.251 ‐ 0.254
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 21, figure 10 through 19) to at least the minimum
recommended torque in table 3 or 4. However, do not exceed the maximum recommended torque in table 3 or 4. 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 new
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.
Adding Packing Rings
WARNING
Refer to the WARNING at the beginning of the Maintenance section in this instruction manual.
To avoid personal injury or equipment damage resulting from packing leakage, inspect the valve plug stem and packing box
wall for nicks or scratches while performing the following procedures. Use care to avoid damaging these surfaces.
Key numbers referred to in this procedure are shown in figures 10 through 19, unless otherwise indicated.
When using packing with a lantern ring (key 24) it may be possible to add packing rings above the lantern ring as a
temporary measure without removing the actuator from the valve body.
1. Isolate the control valve from the line pressure, release pressure from both sides of the valve body, and drain the
process media from both sides of the valve. If using a power actuator, also shut‐off all pressure lines to the power
actuator, release all pressure from the actuator. Use lock‐out procedures to be sure that the above measures stay in
effect while you work on the equipment.
2. Remove the packing flange nuts (key 21) and lift the packing flange, upper wiper, and packing follower (keys 19, 27,
and 28) away from the valve body.
3. It may be possible to dig out the old packing rings on top of the lantern ring, but use care to avoid scratching the
valve plug stem or packing box wall. Clean all metal parts to remove particles that would prevent the packing from
sealing.
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4. Remove the stem connector and slip the packing rings over the end of the valve plug stem.
5. Reassemble the packing follower, upper wiper, packing flange, and packing flange nuts (keys 28, 27, 19, and 21).
6. Reconnect the body‐actuator stem connection according to the appropriate actuator instruction manual.
7. Tighten the packing flange nuts only far enough to stop leakage under operating conditions. Check for leakage
around the packing follower when the valve is being put into service. Retighten the packing flange nuts as required
(see table 3 or 4).
Replacing Packing
WARNING
Refer to the WARNING at the beginning of the Maintenance section in this instruction manual.
To avoid personal injury or equipment damage resulting from packing leakage, inspect the valve plug stem and packing box
wall for nicks or scratches while performing the following procedures. Use care to avoid damaging these surfaces.
Key numbers referred to in this procedure are shown in figures 10 through 19, 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. If using a power actuator, also shut‐off all pressure lines to the power
actuator, release all pressure from the actuator. Use lock‐out procedures to be sure that the above measures stay in
effect while you work on the equipment.
2. 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.
3. Remove either the yoke locknut (key 32) or the hex nuts (key 30), and remove the actuator from the bonnet
(key 18).
4. Loosen the packing flange nuts (key 21) so that the packing (keys 22, 23, 209, or 210, figures 3, 4, or 5) is not tight
on the valve plug stem (key 6). Remove any travel indicator disk and stem locknuts from the valve plug stem
threads.
CAUTION
When lifting the bonnet (key 18), be sure that the valve plug and stem assembly (keys 5 and 6) remains on the seat ring
(key 4). 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.
WARNING
To avoid personal injury or property damage caused by uncontrolled movement of the bonnet, loosen the bonnet by
following the instructions in the next step. Do not remove a stuck bonnet by pulling on it with equipment that can stretch
or store energy in any other manner. The sudden release of stored energy can cause uncontrolled movement of the bonnet.
If the cage sticks to the bonnet, proceed carefully with bonnet removal and support the cage so that it will not fall
unexpectedly from the bonnet.
Note
The following step also provides additional assurance that the valve body fluid pressure has been relieved.
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Instruction Manual
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NotchFlo DST Valve
August 2020
5. Hex nuts (key 14) attach the bonnet to the valve body. Loosen these nuts approximately 3 mm (1/8 inch). Then
loosen the body‐to‐bonnet gasketed joint by either rocking the bonnet or prying between the bonnet and valve
body. Work the prying tool around the bonnet until the bonnet loosens. If no fluid leaks from the joint, proceed to
the next step. If fluid leaks from the joint, the process pressure was not relieved from the valve as noted in the
Warning at the beginning of the Maintenance section in this manual.
6. Unscrew the hex nuts (key 14) and carefully lift the bonnet off the valve stem. 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.
7. Remove the valve plug (key 5), bonnet gasket (key 11), cage (key 2), cage gaskets (if applicable) (key 65), seat ring
(key 4), and the seat ring gasket(s) (key 12).
CAUTION
Inspect the seat ring, cage, bonnet, and body gasket surfaces. These surfaces must be in good condition, with all foreign
material removed. Small burrs less than approximately 0.076 mm (0.003 inch) in height (the thickness of a human hair) can
be ignored. Scratches or burrs that run across the serrations are not permitted under any conditions, because they will
prevent the gaskets from sealing properly.
8. Clean all gasket surfaces with a good wire brush. Clean in the same direction as the surface serrations, not across
them.
9. Cover the opening in the valve body to protect the gasket surface and to prevent foreign material from getting into
the valve body cavity.
10. Remove the packing flange nuts (key 21), packing flange (key 19), upper wiper (key 27), and packing follower
(key 28). Carefully push out all the remaining packing parts from the valve side of the bonnet using a rounded rod or
other tool that will not scratch the packing box wall.
11. Clean the packing box and the following metal packing parts: packing follower, packing box ring (key 26), spring or
lantern ring (key 24), and, for single arrangements of PTFE V‐ring packing only, special washer (key 25).
12. 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.
13. Remove the protective covering from the valve body cavity, and install the seat ring and cage using new seat ring
gasket(s) (key 12), bonnet gasket (key 11), and cage gaskets (if applicable) (key 65). Install the plug, then slide the
bonnet over the stem and onto the studs (key 13).
Figure 6. Installing Graphite Ribbon/Filament Packing Rings One at a Time
VALVE STEM
PACKING
FOLLOWER
BONNET
TOP OF PACKING
RING EVEN WITH
BOTTOM OF
ENTRANCE
CHAMFER
A2207‐2
INSTALLING
FIRST PACKING RING
INSTALLING
SECOND PACKING RING
11
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