Emerson FISHER NotchFlo DST User manual

www.Fisher.com
D103211X012
Design NotchFlorDST Control Valve
Contents
Introduction 1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Scope of Manual 1. . . . . . . . . . . . . . . . . . . . . . . . .
Description 1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Specifications 3. . . . . . . . . . . . . . . . . . . . . . . . . . . .
Installation 3. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Maintenance 4. . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Packing Maintenance 4. . . . . . . . . . . . . . . . . . . . .
Adding Packing Rings 6. . . . . . . . . . . . . . . . . . . .
Replacing Packing 7. . . . . . . . . . . . . . . . . . . . . . .
Trim Removal 9. . . . . . . . . . . . . . . . . . . . . . . . . . . .
Valve Plug Maintenance 10. . . . . . . . . . . . . . . . . .
Lapping Seats 10. . . . . . . . . . . . . . . . . . . . . . . . . . .
Trim Replacement 11. . . . . . . . . . . . . . . . . . . . . . .
Parts Ordering 12. . . . . . . . . . . . . . . . . . . . . . . . . . . .
Parts Kits 13. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Parts List 13. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Introduction
Scope of Manual
This instruction manual includes installation,
maintenance, and parts information for the Design
NotchFlorDST control valve. Refer to separate
manuals for instructions covering the actuator,
positioner, and accessories.
No person may install, operate, or maintain Design
NotchFlo DST valves without first Dbeing fully
trained and qualified in valve, actuator, and
accessory installation, operation, and maintenance,
and Dcarefully reading and understanding the
contents of this manual. If you have any questions
about these instructions, contact your Fisher sales
office before proceeding.
Note
Neither Emerson, Emerson Process
Management, nor Fisher assume
responsibility for the selection, use, or
maintenance of any product.
Responsibility for proper selection,
use, and maintenance of any Fisher
product remains solely with the
purchaser.
W9050
Figure 1. Design NotchFlorDST Control Valve
Description
The Design NotchFlo DST globe (figure 1) and angle
valves have metal seats, cage guiding, quick change
trim, and push-down-to-close valve plug action.
Class 600 (all valve sizes) and Class 900 and 1500
(2- to 4-inch valves) use balanced valve plugs. Class
900 and 1500 (1- and 1.5 valves) 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.
Design NotchFlo DST Valves with 3-stage and
4-stage anti-cavitation trim (figure 2) offer control of
high pressure drop liquids while avoiding the
damaging effects of cavitation in a properly sized
valve.
NotchFlo DST control valves utilize a high
resistance, multi-stage, axial flow process 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.
Instruction Manual
Form 5794
February 2005 NotchFlo DST

NotchFlo DST
Instruction Manual
Form 5794
February 2005
2
Table 1. Specifications
Available Valves
Class 600 3-Stage: Level C only
Class 900 and 1500 4-Stage: Levels A, B,
and C(1)
End Connection Styles and Ratings(2)
Flanged: Consistent with Class 600, 900, and
1500 per ASME B16.34
Socket Welding: Consistent with Class 600, 900,
and 1500 per ASME B16.34
Buttwelding: Consistent with Class 600, 900,
and 1500 per ASME B16.34
Also see table 2
Shutoff Classification
Class V: [5x10–12m3/sec/bar/mm of port diameter
(0.0005 mL/min/psid/in) of water at service
pressure drop] per ANSI/FCI 70-2 and IEC
60534-4
Flow Characteristic
Linear
Flow Direction
Flow up
Approximate Weights
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.
Table 2. Approximate Weights (Valve and Bonnet Assemblies)
KILOGRAMS POUNDS
VALVE DESIGN VALVE SIZE,
INCHES CLASS Flanged
Socket Weld(1),
Butt Weld(3),
Screwed(2)
Flanged
Socket Weld(1),
Butt Weld(3),
Screwed(2)
1 600 19 15 42 34
3 Stage Globe Valves
2 600 40 31 88 68
3-Stage Globe Valves 3 600 72 51 158 112
4 600 120 80 264 176
2900 and 1500 93 83 204 184
3
900 177 - - - 391 - - -
4-Stage Globe Valves 31500 185 140 408 308
4 Stage Globe Valves
4
900 327 - - - 722 - - -
41500 338 282 745 622
1900 and 1500 48 41 105 91
1.5 900 and 1500 55 43 121 94
4-Stage Angle Valves 2900 and 1500 93 97 206 214
4 Stage Angle Valves
3900 and 1500 174 - - - 384 - - -
4900 and 1500 285 - - - 628 - - -
1. SWE available on 1-, 1.5, and 2-inch size only.
2. Screwed end available on 1- and 2-inch Class 600 only.
3. BWE available on globe valves only.
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 Design
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.

NotchFlo DST
Instruction Manual
Form 5794
February 2005
3
Figure 2. NotchFlorDST Trim
W8538–1
Specifications
Specifications for Design NotchFlo DST valves are
shown in table 1.
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.
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 contacting your Fisher 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.

NotchFlo DST
Instruction Manual
Form 5794
February 2005
4
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 7 through 13.
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:
DAlways wear protective gloves,
clothing, and eyewear when
performing any maintenance
operations to avoid personal injury.
DDisconnect 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.
DUse 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.
DVent the power actuator loading
pressure and relieve any actuator
spring precompression.
DUse lock-out procedures to be
sure that the above measures stay in
effect while you work on the
equipment.
DThe 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.
DCheck with your process or safety
engineer for any additional measures
that must be taken to protect against
process media.
CAUTION
The Design 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 Fisher
replacement parts may result in valve
damage.
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.

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Instruction Manual
Form 5794
February 2005
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Figure 3. PTFE V-Ring Packing Arrangements for Plain and Extension Bonnets
UPPER WIPER
(KEY 27)
PACKING
FOLLOWER (KEY 28)
PACKING BOX
RING (KEY 26)
FOR 316 SST
METAL PACKING BOX PARTS
SINGLE ARRANGEMENTS
12A7837-A
B1429-5 / IL
FOR ALL OTHER METAL PACKING
BOX PART MATERIALS
SPACER (KEY 24)
UPPER WIPER
(KEY 27)
PACKING
FOLLOWER
(KEY 28)
PACKING BOX
RING (KEY 26)
FEMALE
ADAPTOR
FEMALE
ADAPTOR
MALE
ADAPTOR
PACKING
RING
MALE
ADAPTOR
PACKING
RING
WASHER
(KEY 25)
SPRING
(KEY 24)
LOWER
WIPER
LOWER
WIPER
1
1
1
1
1
1
1
1
NOTE:
MALE ADAPTOR, PACKING RING, FEMALE ADAPTOR,
AND LOWER WIPER ARE PART OF PACKING SET (KEY 22).
2 REQ’D FOR DOUBLE ARRANGEMENTS, EXCEPT LOWER WIPER.
1
Figure 4. Detail of Graphite Ribbon/Filament Packing for
Plain and Extension Bonnets
PACKING
FOLLOWER
(KEY 28)
LANTERN
RING (KEY 24)
PACKING BOX
RING (KEY 26)
1
12.7 mm
(0.5 INCH)
STEM
SINGLE ARRANGEMENTS
NOTE:
0.102 mm (0.004 INCH) THICK SACRIFICIAL ZINC WASHERS;
USE ONLY ONE BELOW EACH GRAPHITE RIBBON RING.
1
GRAPHITE
RIBBON
PACKING RING
(KEY 23)
GRAPHITE
FILAMENT
PACKING RING
(KEY 23)
1
19.1 25.4 mm
(0.75 1 INCH)
STEM
13A9775-B 13A9776-B
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 7 to 13) until the
shoulder is against the bonnet. If leakage cannot be
stopped in this manner, proceed to the Replacing
Packing procedure.
Figure 5. Detail of Graphite ULF Packing for Plain Bonnets
SINGLE ARRANGEMENTS
39B9286ĆA
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 7
to 13) 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.

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Instruction Manual
Form 5794
February 2005
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Table 3. Class 600 Recommended Torque for Packing Flange Nuts (non live-loaded)
VALVE STEM GRAPHITE TYPE PACKING PTFE TYPE PACKING
VALVE STEM
DIAMETER CLASS Minimum Torque Maximum Torque Minimum Torque Maximum Torque
mm Inches
CLASS
NSm LbfSin NSm LbfSin NSm LbfSin NSm LbfSin
12.7 0.5 600 9 81 14 122 4 39 7 58
19.1 0.75 600 21 182 31 274 10 87 15 131
25.4 1 600 35 310 53 466 17 149 25 223
Table 4. Class 900 and 1500 Recommended Torque for Packing Flange Nuts (non live-loaded)
VALVE STEM TORQUE
VALVE STEM
DIAMETER CLASS NSm lbfSft
mm Inches
CLASS
Min Max Min Max
12.7 0.5 900 12 18 9 13
12.7 0.5 1500 15 22 11 16
19.1 0.75 900 27 41 20 30
19.1 0.75 1500 34 50 25 37
25.4 1 900 42 62 31 46
25.4 1 1500 52 77 38 57
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 7 to 13, 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.
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).

NotchFlo DST
Instruction Manual
Form 5794
February 2005
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Table 5. Torque for Body-to-Bonnet Bolting Using Nickel Never-SeezrLubricant for Class 600 NotchFlorDST Valves
VALVE
VALVE SIZE
BOLT TORQUES(1)
VALVE
RATING
VALVE SIZE,
INCHES
SA193-B7, SA193-B8M Class 2(3) SA193-B8M Class 1(2)
RATING
INCHES
NSm LbfSft NSm LbfSft
1 129 95 64 47
Class 600
2 96 71 45 33
Cl
ass
600
3 169 125 88 65
4 271 200 156 115
1. Determined from laboratory tests.
2. SA193-B8M annealed.
3. SA193-B8M strain hardened.
Table 6. Torque for Body-to-Bonnet Bolting Using Nickel Never-SeezrLubricant for Class 900 and 1500 NotchFlorDST Valves
BOLT TORQUES(1)
VALVE VALVE SIZE, NSm lbfSft
VALVE
RATING
VALVE SIZE,
INCHES B7 and B8M Class 2(3)
Studs
B8M Class 1(2)
Studs
B7 and B8M Class 2(3)
Studs
B8M Class 1(2)
Studs
1 or 1.5 260 150 190 110
Class 900 & 1500
2 390 240 290 180
Class 900 & 1500 3 730 530 540 390
4 970 730 720 540
1. Determined from laboratory tests.
2. SA193-B8M annealed.
3. SA193-B8M strain hardened.
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 7 to 13, 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.

NotchFlo DST
Instruction Manual
Form 5794
February 2005
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Table 7. 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
0.5
0.75
1
81-115
237-339
420-481
60-85
175-250
310-355
3.20 - 3.25
4.80 - 4.88
6.38 - 6.45
0.126 - 0.128
0.189 - 0.192
0.251 - 0.254
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.
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), seat ring (key 4), and the
seat ring gaskets (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, since 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 gaskets (key 12) and bonnet gasket
(key 11). Install the plug, then slide the bonnet over
the stem and onto the studs (key 13).
Note
The prelubricated hex nuts (key 14)
referred to in step 14 can be identified
by a black film coating on the nut
threads.

NotchFlo DST
Instruction Manual
Form 5794
February 2005
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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
INSTALLING
SECOND PACKING RING
A2207-2 / IL
INSTALLING
FIRST PACKING RING
The proper bolting procedures in step
14 include—but are not limited
to—ensuring that the bonnet stud
threads are clean, and that the hex
nuts are evenly tightened to the
specified torque values.
CAUTION
Failure to comply with good
bonnet-to-body bolting practices and
the torque values shown in tables 5
and 6 may result in damage to the
valve. Cheater bars or slug wrenches
should not be used for this procedure.
Hot torquing is not recommended on
Class 900 and 1500 valves. When
operating temperature has been
reached, perform this torquing
procedure once again on Class 600
valves.
14. Lubricate the stud threads and the faces of the
hex nuts (key 14) with Never-Seez Pure Nickel
Special lubricant or equivalent (not necessary if new
factory prelubricated hex nuts are used). Install the
hex nuts and tighten them finger-tight. Stroke the
valve several times to center the trim. Torque the
nuts in a crisscross pattern to no more than 1/4 of
the nominal torque value specified in tables 5 and 6.
When all nuts are tightened to that torque value,
increase the torque by 1/4 of the specified nominal
torque and repeat the crisscross pattern. Repeat this
procedure until all nuts are tightened to the specified
nominal value. Apply the final torque value again
and, if any nut still turns, tighten every nut again.
Note
When installing packing rings, prevent
entrapping air between the rings. Add
the rings one at a time without forcing
them below the chamfer of the packing
box entrance chamber. As each
successive ring is added, the stack
should not be pushed down more than
the thickness of the added ring
(figure 6).
15. Install new packing and the metal packing box
parts according to the appropriate arrangement in
figures 3, 4, or 5. If desired, packing parts may be
pre-lubricated with a silicon base grease for easier
installation. Slip a smooth-edged pipe over the valve
stem, and gently tap each soft packing part into the
packing box, being sure that air is not trapped
between adjacent soft parts.
16. Slide the packing follower, wiper, and packing
flange into position. Lubricate the packing flange
studs (key 20) and the faces of the packing flange
nuts (key 21). Install the packing flange nuts.
For the spring-loaded PTFE V-ring packing
shown in figure 3, tighten the packing flange nuts
until the shoulder on the packing follower (key 28)
contacts the bonnet.
For graphite packing, tighten the packing flange
nuts to the maximum recommended torque shown in
table 3 or 4. Then, loosen the packing flange nuts,
and retighten them to the recommended minimum
torque shown in table 3 or 4.
For other packing types, tighten the packing flange
nuts alternately in small equal increments until one
of the nuts reaches the minimum recommended
torque shown in table 3 or 4. Then, tighten the
remaining flange nuts until the packing flange is level
and at a 90-degree angle to the valve stem.
17. Mount the actuator on the valve body assembly,
and reconnect the actuator and valve plug stems
according to the procedures in the appropriate
actuator instruction manual.
Trim Removal
Key numbers referenced in this procedure are
shown in figures 7 to 13, except where indicated.
1. Remove the actuator and bonnet by following
steps 1 through 6 of the replacing packing
procedure. Observe all warnings and cautions in that
procedure.

NotchFlo DST
Instruction Manual
Form 5794
February 2005
10
2. Lift the valve stem and attached valve plug out of
the valve body. If the valve plug is to be reused, tape
or otherwise protect the valve plug stem and the
valve plug seating surface to prevent scratches.
3. Lift out the cage (key 2) and the bonnet gasket
(key 11).
4. Remove the seat ring (key 4) and the seat ring
gaskets (key 12).
5. Inspect the parts for wear or damage and replace
if needed.
6. Refer to the Valve Plug Maintenance procedure
or to the Lapping Seats procedure.
Valve Plug Maintenance
Key numbers used in this procedure are shown in
figures 7 to 13, except where indicated.
1. With the valve plug (key 5) removed according to
the trim removal procedure, proceed as appropriate:
For the 1- and 1.5 inch Class 900 or 1500 Design
NotchFlo DST valves, proceed to step 2.
For all other Design NotchFlo DST valves, work
the retaining ring (key 10) off the valve plug with a
screwdriver. Carefully slide the backup ring, seal
ring, and anti-extrusion rings (keys 9, 8, and 63) off
the valve plug.
2. To replace the valve plug stem (key 6), drive out
the pin (key 7), and unscrew the stem from the valve
plug.
CAUTION
Never reuse an old stem with a new
valve plug. Using an old stem with a
new plug requires drilling a new pin
hole in the stem. This weakens the
stem and may cause the stem to fail in
service. If a new valve plug is required,
always order a valve plug, stem, and
pin as an assembly. Specify the
correct part number of each of the
three parts, but state that the parts are
being ordered as an assembly.
A used valve plug may be reused with
a new stem.
3. Thread the new stem into the valve plug and
tighten it to the appropriate torque value given in
table 7. Using the valve plug pin hole as a guide, drill
the pin hole through the stem. Refer to table 7 for
drill sizes.
4. Drive in the pin to lock the assembly.
5. If it is necessary to lap the seating surfaces,
complete the lapping seats procedure before
installing the seal ring. The Trim Replacement
procedure provides seal ring installation instructions
and valve reassembly instructions.
Lapping Seats
Key numbers referenced in this procedure are
shown in figures 7 to 13, except where indicated.
With metal-seat constructions, lapping seating
surfaces of the valve plug and seat ring (keys 5 and
4) can improve shutoff. (Deep nicks should be
machined out rather than ground out.) Use a good
quality lapping compound of a mixture of 280 to
600-grit. Apply the compound to the bottom of the
valve plug.
Note
The Design NotchFlo DST valves use
spiral-wound gaskets. These gaskets
provide their seal by being crushed
and therefore should never be reused.
This includes reusing a gasket after
the lapping procedure has been
performed.
An “old” gasket can be used to lap
the seat, however the gasket must be
replaced with a new gasket.
To preserve the effects of lapping, do
not change either the position of the
seat ring in the valve body cavity or
the position of the cage on the seat
ring after lapping the seating surfaces.
When the parts are removed for
cleaning and replacement of the “old”
gaskets, return them to the original
positions.
Use the following procedure to lap the seating
surfaces.
1. Install the following parts according to the
instructions presented in the trim replacement
procedure: “old” seat ring gasket (key 12), seat ring
(key 4), cage (key 2), and “old” bonnet gasket
(key 11).
2. Proceed as appropriate:
For a Design NotchFlo DST balanced valve,
install the valve plug and stem assembly (keys 5
and 6)—without seal ring (key 8)—into the cage.

NotchFlo DST
Instruction Manual
Form 5794
February 2005
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For a Design NotchFlo DST unbalanced valve,
install the valve plug and stem assembly (keys 5
and 6) into the cage.
3. Install the bonnet (key 18) over the valve stem,
and secure the bonnet with four of the hex nuts
(key 14).
4. Attach a handle, such as a piece of strap iron
secured by stem locknuts, to the valve stem. Rotate
the handle alternately in each direction to lap the
seats.
5. After lapping, disassemble as necessary (you
may mark the position of the seat ring and cage with
a soft tip marker). Clean the seating surfaces,
replace the gaskets, reassembly (taking care to
return the seat ring and cage to their original
positions), and test for shutoff. Repeat the lapping
procedure if necessary.
Trim Replacement
WARNING
Observe the warning at the start of the
Maintenance section.
After all trim maintenance has been completed,
reassemble the valve body by following the
numbered steps below. Be certain that all gasketed
surfaces have been well cleaned. Key numbers
referenced in this procedure are shown in figures 7
to 13, except where indicated.
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 inches) 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, since they will
prevent the gaskets from sealing
properly.
1. Install the seat ring gasket (key 12) into the valve
body. Install the seat ring (key 4).
2. Install the second seat ring gasket (key 12) onto
the seat ring.
3. Install the cage.
4. For a Design NotchFlo DST balanced valve,
install the anti-extrusion rings (key 63) onto the valve
plug (key 5). Install the seal ring (key 8) onto the
valve plug (key 5). Install the ring with the open side
facing the valve plug stem end of the valve plug for
flow-up applications (view A of figures 7 to 10, 12
and 13). Slide the backup ring (key 9) onto the valve
plug. Secure with the retaining ring (key 10).
5. Install the valve plug into the cage.
6. Install the bonnet gasket (key 11) on the cage.
7. Install the bonnet over the valve stem and onto
the valve body.
Note
The prelubricated hex nuts (key 14)
referred to in step 8 can be identified
by a black film coating on the nut
threads.
The proper bolting procedures in step
8 include—but are not limited
to—ensuring that the bonnet stud
threads are clean, and that the hex
nuts are evenly tightened to the
specified torque values.
CAUTION
Failure to comply with good
bonnet-to-body bolting practices and
the torque values shown in tables 5
and 6 may result in damage to the
valve. Cheater bars or slug wrenches
should not be used for this procedure.
Hot torquing is not recommended on
Class 900 and 1500 valves. When
operating temperature has been
reached, perform this torquing
procedure once again on Class 600
valves.

NotchFlo DST
Instruction Manual
Form 5794
February 2005
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Table 8. Actuator Groups by Type Number
Group 1
71 & 90 mm (2-13/16 and 3-9/16 Inch) Yoke Boss
Group 100
127 mm (5-Inch) Yoke Boss
350--Except 90 mm (3-9/16 inch) Yoke Boss
585C
350
585C
657
585C
657 & 667
1008
Group 101
127 mm (5-Inch) Yoke Boss
1008
667
8. Lubricate the stud threads and the faces of the
hex nuts (key 14) with Never-Seez Pure Nickel
Special lubricant or equivalent (not necessary if new
factory prelubricated hex nuts are used). Install the
hex nuts, but do not tighten them. Torque the nuts in
a crisscross pattern to no more than 1/4 of the
nominal torque value specified in table 5 or 6. When
all nuts are tightened to that torque value, increase
the torque by 1/4 of the specified nominal torque and
repeat the crisscross pattern. Repeat this procedure
until all nuts are tightened to the specified nominal
value. Apply the final torque value again and, if any
nut still turns, tighten every nut again.
9. Install new packing and packing box parts per
steps 15 and 16 of the Replacing Packing
procedure. Be certain to observe the note given prior
to step 15 of that procedure.
10. Mount the actuator by following the procedures
in the actuator instruction manual. Check for packing
leakage as the valve is being put into service.
Retorque the packing flange nuts as required. See
tables 3 and 4.
Parts Ordering
Each valve body-bonnet assembly is assigned a
serial number which can be found on the valve. This
same number also appears on the actuator
nameplate when the valve is shipped from the
factory as part of a control valve assembly. Refer to
the serial number when contacting your Fisher sales
office for technical assistance. When ordering
replacement parts, refer to the serial number and to
the eleven-character part number for each part
required from the following Parts Kit or Parts List
information.
Note
Use only genuine Fisher replacement
parts. Components that are not
supplied by Fisher should not, under
any circumstances, be used in any
Fisher valve, because they will void
your warranty, might adversely affect
the performance of the valve, and
might jeopardize worker and
workplace safety.
Note
Neither Emerson, Emerson Process
Management, nor Fisher assume
responsibility for the selection, use, or
maintenance of any product.
Responsibility for proper selection,
use, and maintenance of any Fisher
product remains solely with the
purchaser and end-user.

NotchFlo DST
Instruction Manual
Form 5794
February 2005
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Parts Kits
Packing Kits (non live-loaded)
Stem Diameter, mm (Inches)
Yoke Boss Diameter, mm (Inches)
12.7 (0.5)
71 (2.8125)
19.1 (0.75)
90 (3.5625)
25.4 (1)
127 (5)
Single PTFE (Contains keys 22, 24, 25, 26, 27) RPACKX00022 RPACKX00032 - - -
Single Graphite Ribbon/Filament (Contains keys 23, 23, 24, 26) RPACKX00112 RPACKX00122 - - -
Graphite ULF (Contains keys 207, 208, 209, 210, 214) RPACKX00602 RPACKX00612 RPACKX00622
Parts List
Numerous available combinations of valve parts make
selection of some parts difficult; when ordering valve
parts for which a part number is not listed, provide the
valve serial number with the order, permitting proper
selection of replacement parts to be made at the
factory.
Note
For part numbers not shown, contact your Fisher
sales office.
Key Description Part Number
1 Valve Body ---
If you need a valve body as a replacement
part, order by valve size, serial number,
and desired material.
2* Cage
4* Seat Ring
5* Valve Plug
6* Valve Stem
7* Pin
8* Seal Ring
9* Back Up Ring
Key Description Part Number
10* Retaining Ring
11* Bonnet Gasket
12* Seat Ring Gasket (2 req’d)
13 Stud, Cont Thd
14 Hex Nut
15 Lubricant (Never-Seez Nickel Special
8 lb [3.6 Kg] can)
16 Nameplate (not shown)
17 Wire (not shown)
18 Bonnet---
If you need a bonnet as a replacement
part, order by valve size and stem
diameter, serial number, and desired
material.
19 Packing Flange
20 Stud Bolt
21 Hex Nut
22* Packing Set
23* Packing Ring
24 Spring or Lantern Ring
25 Washer, Special
26* Packing Box Ring
27* Upper Wiper
28 Follower
29 Stud Bolt
30 Hex Nut
32 Yoke Locknut
38 Drive Screw
41 Flow Arrow
63* Anti-Extrusion Ring
*Recommended spare parts

NotchFlo DST
Instruction Manual
Form 5794
February 2005
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Figure 7. Design NotchFlorDST Class 600 Balanced Globe Valve Assembly (size 1 to 3 inch)
GE14588-A
jAPPLY LUB

NotchFlo DST
Instruction Manual
Form 5794
February 2005
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Figure 8. Design NotchFlorDST Class 600 Balanced Globe Valve Assembly (size 4 inch)
GE14589
jAPPLY LUB

NotchFlo DST
Instruction Manual
Form 5794
February 2005
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Figure 9. Design NotchFlorDST Class 1500 Balanced Globe Valve Assembly (size 2 and 3 inch)
GE09701-A
jAPPLY LUB

NotchFlo DST
Instruction Manual
Form 5794
February 2005
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Figure 10. Design NotchFlorDST Class 1500 Balanced Globe Valve Assembly (size 4 inch)
GE14166-A
jAPPLY LUB

NotchFlo DST
Instruction Manual
Form 5794
February 2005
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Figure 11. Design NotchFlorDST Class 1500 Unbalanced Angle Valve Assembly (size 1 to 1.5 inch)
GE14052-A
jAPPLY LUB

NotchFlo DST
Instruction Manual
Form 5794
February 2005
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Figure 12. Design NotchFlorDST Class 1500 Balanced Angle Valve Assembly (size 2 and 3 inch)
GE11286-A
jAPPLY LUB

NotchFlo DST
Instruction Manual
Form 5794
February 2005
20
Figure 13. Design NotchFlorDST Class 1500 Balanced Angle Valve Assembly (size 4 inch)
GE14174-A
jAPPLY LUB
Fisher
Marshalltown, Iowa 50158 USA
Cernay 68700 France
Sao Paulo 05424 Brazil
Singapore 128461
Emerson Process Management
www.Fisher.com
The contents of this publication are presented for informational purposes only, and while every effort has been made to ensure their accuracy, they are
not to be construed as warranties or guarantees, express or implied, regarding the products or services described herein or their use or applicability.
We reserve the right to modify or improve the designs or specifications of such products at any time without notice.
Neither Emerson, Emerson Process Management, nor Fisher assume responsibility for the selection, use or maintenance of any product. Responsibility
for proper selection, use and maintenance of any Fisher product remains solely with the purchaser and end-user.
EFisher Controls International LLC 2005; All Rights Reserved Printed in USA
NotchFlo and Fisher are marks owned by Fisher Controls International LLC, a member of the Emerson Process Management business division of
Emerson Electric Co. The Emerson logo is a trademark and service mark of Emerson Electric Co. All other marks are the property of their
respective owners.