Fisher-Rosemount Posi-Seal A31 User manual

D500240X012
Posi-SealRType A31A High Performance
Butterfly Valve 3 through 12-Inch
Contents
Introduction 1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Scope of Manual 1. . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Specifications 2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Description 1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Installation 2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Adjusting the Actuator Travel Stops or Travel 3. . . .
Valve Orientation 3. . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Preparing for Installation 4. . . . . . . . . . . . . . . . . . . . . .
Installing Wafer-Style Valves 7. . . . . . . . . . . . . . . . . . .
InstallingSingle-Flange Valves 8. . . . . . . . . . . . . . . . .
Maintenance 9. . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Replacing Packing 9. . . . . . . . . . . . . . . . . . . . . . . . . . .
Removing the Valve from the Pipeline 10. . . . . . . . .
Removing/Installingthe Seal Ring 11. . . . . . . . . . . .
PTFE Seal Installation 11. . . . . . . . . . . . . . . . . . . . .
NOVEX Seal and Phoenix III
Fire-Tested Seal Installation 12. . . . . . . . . . . . . . . .
Cryogenic Seal Installation 13. . . . . . . . . . . . . . . . .
Anti-BlowoutProtection, Packing,
Valve Shaft(s), Disk, and Bearing
Maintenance 14. . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Removal 14. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Installing a One-Piece Shaft 16. . . . . . . . . . . . . . . .
Installing a Two-Piece Shaft 16. . . . . . . . . . . . . . . .
Installing the Gasket Retainer 17. . . . . . . . . . . . . . .
Parts Ordering 18. . . . . . . . . . . . . . . . . . . . . . . . . . .
Parts Reference 18. . . . . . . . . . . . . . . . . . . . . . . . . . .
Introduction
Scope of Manual
This instruction manual provides installation, mainte-
nance, and parts ordering information for the
POSI-SEAL Type A31A high-performance butterfly
Figure 1. Typical Type A31A Valve
W5812-1/IL
W5811-1/IL
valves. Figure 1 shows typical Type A31A valves. For
information regarding actuators and accessories, refer
to separate instruction manuals.
Only personnel qualified through training or experience
should install, operate, and maintain this valve. If you
have any questions concerning these instructions,
contact your Fisher Controls sales representative or
sales office before proceeding.
Description
The Type A31A high-performance butterfly valve fea-
tures a keyed drive shaft. The keyed shaft combines
with a variety of handlevers, handwheels, pneumatic
piston or spring-and-diaphragm actuators to make the
Type A31A a reliable, high-performance, butterfly
valve for a variety of applications in the various pro-
cess industries.
Instruction Manual
Form 5456
November 1998 Type A31A

Type A31A
2
Table 1. Specifications
Available Valve Configurations
JFlangeless, wafer-style or Jsingle-flange
(lugged) control valve with a one-piece valve body
and a two-component seal/backup O-ring, and a
keyed drive shaft
Valve Sizes
J3, J4, J6, J8, J10, J12-inch
End Connection Style
JFlangeless, wafer-style or Jsingle flange valve
body designed to fit between raised-face mating
flanges per ASME B16.5 Class 150 or 300
Maximum Inlet Pressure/Temperature(4)
Consistent with ANSI Class J150 and J300 pres-
sure/temperature ratings per ASME B16.34. Also,
see figure 2 for additional information.
Available Seal Configurations
JStandard soft seal ring (PTFE) with fluoroelas-
tomer or EPR backup ring, JNOVEXtseal ring,
Class 150, (S31600, 316 SST)(1) JNOVEX seal
ring, Class 300, standard pressure rating (S31600,
316 SST)(1) JNOVEX seal ring, Class 300, high
pressure rating (S21800, Nitronic 60), JPhoenixR
III fire-tested seal ring (S31600, 316 SST) with resil-
ient insert (PTFE) and backup ring (fluoroelastom-
er), or Jcryogenic seal ring (Kel-F) with optional
backup ring (aluminum)
Valve Classification
Face-to-face dimensions are in compliance with
MSS SP68 and API 609 standards; valve bodies
are designed for installation between ASME B16.5
Class 150 or 300 raised-face flanges
Shutoff Classification. Per ANSI/FCI 70-2
Standard Soft Seal: Bidirectional bubble-tight shut-
off
NOVEX Seal: Unidirectional shutoff Class V (re-
verse flow direction only)
Phoenix III Seal: Bidirectional bubble-tight shutoff
Phoenix III Seal for Fire-Tested Applications:
Consult your Fisher Controls sales office or repre-
sentative for fire tested performance
Cryogenic seal applications: Consult your Fisher
Controls sales office or sales representative
Installed Valve Orientation
See figure 3 for orientation guidelines for optimum
seal performance
Valve In-Line Position
Shaft horizontal. See figure 5
Available Actuators
JHandlever, Jhandwheel, Jspring-and-dia-
phragm, or Jpneumatic piston
Disk Rotation
Clockwise to close
1. For specific information about materials of construction, contact your nearest Fisher Controls sales office or representative.
2. The pressure/temperature limits in this manual, and any applicable code or standard limitation, should not be exceeded.
The Type A31A is available in either a flangeless (wa-
fer) or a single-flange (lugged) valve design, with a
variety of seal, valve body, and internal components.
The Type A31A valve features a patented, dynamic
sealing design that is used in a variety of demanding
applications. With the appropriate seal configuration
and materials of construction, the pressure-assisted
seal provides shutoff against the full ANSI class pres-
sure range for the specific valve type.
Installation
WARNING
To avoid personal injury or property
damage resulting from the sudden re-
lease of pressure, do not install the
valve assembly where service condi-
tions could exceed the limits given in
this manual or on appropriate name-
plates. Use pressure-relieving devices
as required by government or accepted
industry codes and good engineering
practices.

Type A31A
3
Table 2. Material Temperature Ratings
COMPONENT, ANSI CLASS, TEMPERATURE RANGE
COMPONENT
,
ANSI
CLASS
,
MATERIAL OF CONSTRUCTION _F_C
Seal Ring See Figure 2
Backup Ring
Soft Seal
Fluoroelastomer
EPR
Nitrile
PTFE
Neoprene
Phoenix III Seal
Fluoroelastomer
EPR
Nitrile
Neoprene
Cryogenic Seal
Aluminum (Optional)
-20 to 400
-65 to 360
-20 to 200
-100 to 400
-45 to 300
-40 to 500
-80 to 400
-40 to 300
-65 to 300
-425 to 400
-29 to 204
-54 to 182
-29 to 93
-73 to 204
-43 to 149
-40 to 260
-62 to 204
-40 to 149
-59 to 149
-254 to 204
Shaft Packing(1)
PTFE
Graphite
In Oxidizing Media
In Inert or Reducing Media
-425 to 450
-425 to 1000
-425 to 1500
-254 to 232
-254 to 538
-254 to 816
Shaft(2)
17-4PH H1025
17-4PH H1150M
K-Monel
Inconel 718
Nitronic 50
-100 to 800
-320 to 800
-425 to 900
-425 to 1300
-320 to 1100
-73 to 427
-195 to 427
-254 to 482
-254 to 704
-196 to 593
Bearings
PEEK(3) (standard)
316 SST
PTFE Composition
Bronze
-100 to 500
-425 to 1500
-425 to 325
-425 to 500
-73 to 260
-254 to 816
-254 to 163
-196 to 260
Disk Hardfacing
Electroless Nickel Plating or
hard chrome coating
CoCr-A(4) (Alloy 6) -425 to 1000 -325 to 1500 -254 to 538 -198 to 816
1. These low temperature limits apply to the flowing media. Valve extensions
provided for cryogenic service maintain higher temperatures at the packing box.
2. Shaft material may affect the valve pressure rating. Consult your Fisher Controls
sales office or sales representative.
3. PEEK stands for PolyEtherEtherKetone
4. CoCr-A hardfacing degrades shutoff performance of the seal. Consult your Fisher
Controls sales office or sales representative.
CAUTION
The valve configuration and construc-
tion materials are selected to meet par-
ticular pressure, temperature, pressure
drop, and controlled fluid conditions.
Because pressure drop and temperature
range capabilities limit some combina-
tions of materials, do not apply any oth-
er conditions to the valve without first
contacting your Fisher Controls sales
office or sales representative.
The maximum allowable inlet pressures for Type A31A
valves are consistent with the applicable pressure/
temperature ratings except where limited by material
capabilities shown in figure 2 and table 2.
Adjusting the Actuator Travel Stops
WARNING
The edges of a rotating valve disk have
a shearing effect that may result in per-
sonal injury. To avoid personal injury,
keep clear of the disk edges when rotat-
ing the disk.
CAUTION
When using an actuator, the actuator
travel stops or the actuator travel (for
actuators without adjustable stops)
must be adjusted so that the disk stop
in the valve body does not absorb the
output of the actuator. Failure to limit
actuator travel as described in the next
step can result in damage to the valve
shafts or other valve parts.
1. Locate the actuator travel stop that establishes the
closed position of the valve disk. When adjusting the
travel stop or travel, make sure that the disk is from
0.001 to 0.030 inch (0.03 to 0.76 mm) away from the
internal stop in the valve body. This adjustment is nec-
essary to be certain that the actuator output torque is
fully absorbed by the actuator travel stop or by the ac-
tuator. The internal travel stop in the valve body
should not absorb any of the actuator torque.
2. Before installing the valve/actuator assembly in the
process line, cycle the valve several times to be sure
the valve disk returns to the proper position.
Valve Orientation
Note
The 10- through 12-inch class 150
valves and 8- through 12-inch class 300
valves have a two-piece shaft. The shaft
with the keyed end is called the drive
shaft. The shaft opposite the drive shaft
is called the follower shaft.
The 3- through 8-inch class 150 valves
and 3- through 6-inch class 300 valves
have a one-piece shaft. This one-piece
shaft is keyed and is called the drive
shaft.
Whenever possible, install the valve
with the shaft in the horizontal position
as shown in figure 5.
Horizontal installation can enhance
valve performance because process

Type A31A
4
Table 3. Valve Body Data, Class 150
VALVE
SIZE,
INCHES
SHAFT
DIA.
AT YOKE
BEARING
FACE-TO-
FACE
DIMEN-
SION(1)
MINI-
MUM
I.D.(2)
APPROX.
WEIGHT,
POUNDS
INCHES Inches Wafer Single-
Flange
3 9/16 1-7/8 2.82 19 21
4 11/16 2-1/8 3.69 28 32
6 15/16 2-1/4 5.80 45 49
8 15/16 2-1/2 7.70 61 67
10 1-1/8 2-13/16 10.00 73 95
12 1-1/4 3-3/16 11.76 105 141
VALVE
SIZE,
INCHES
SHAFT
DIA.
AT YOKE
BEARING
FACE-TO-
FACE
DIMEN-
SION(1)
MINI-
MUM
I.D.(2)
APPROX.
WEIGHT,
KILOGRAMS
INCHES mm Wafer Single-
Flange
3 14.3 47.6 71.6 8.6 9.5
4 17.5 54.0 93.7 13 15
6 23.8 57.2 147.3 20 22
8 23.8 63.5 195.6 28 30
10 28.5 71.4 254.0 33 43
12 31.8 81.0 298.7 48 64
1. Face-to-face dimensions are in compliance with MSS SP68 and API 609
specifications.
2. Minimum I.D. is the minimum pipe or flange I.D. required for disk swing clearance.
fluid flow will sweep entrained solids
from valve surfaces, preventing particle
buildup on the seal. Also, installation of
the valve with the shaft horizontal will
extend bearing life because entrained
solids will be less likely to penetrate the
bearings.
The Type A31A valve is designed for installation with
the shaft(s) in any orientation around the pipeline: hori-
zontal, vertical, or at an intermediate angle. However,
when installing the valve in certain services, follow the
recommendations below, which are based on applica-
tion experience:
DIn certain services (process fluids with high con-
centrations of entrained solids, abrasive slurries, poly-
merizing media, or large diameter valves with high
flow rates), installing the valve with the shaft horizontal
to the pipeline and downstream of the seal will en-
hance valve performance.
DInstall a valve supplied for uni-directional shutoff
with the high pressure side in the direction noted on
the valve body. A flow tag with an arrow is provided for
proper installation.
If you have questions about proper valve orientation in
a specific application, contact your Fisher Controls
representative or sales office.
Table 4. Valve Body Data, Class 300
VALVE
SIZE,
INCHES
SHAFT
DIA.
AT YOKE
BEARING
FACE-TO-
FACE
DIMEN-
SION(1)
MINI-
MUM
I.D.(2)
APPROX.
WEIGHT,
POUNDS
INCHES Inches Wafer Single-
Flange
3 9/16 1-7/8 2.82 20 23
4 11/16 2-1/8 3.69 28 31
6 15/16 2-5/16 5.80 44 54
8 1-1/4 2-7/8 7.33 67 91
10 1-5/8 3-5/16 9.10 134 166
12 1-7/8 3-5/8 11.09 171 235
VALVE
SIZE,
INCHES
SHAFT
DIA.
AT YOKE
BEARING
FACE-TO-
FACE
DIMEN-
SION(1)
MINI-
MUM
I.D.(2)
APPROX.
WEIGHT,
KILOGRAMS
INCHES mm Wafer Single-
Flange
3 14.3 47.6 71.6 9.1 10
4 17.5 54.0 93.7 13 14
6 23.8 58.7 147.3 20 25
8 31.8 73.0 186.2 30 41
10 41.3 84.1 231.1 61 75
12 47.6 92.1 281.7 78 107
1. Face-to-face dimensions are in compliance with MSS SP68 and API 609
specifications.
2. Minimum I.D. is the minimum pipe or flange I.D. required for disk swing clearance.
Preparing for Installation
CAUTION
To avoid damage to the valve disk dur-
ing installation, the valve must be in the
fully-closed position. If the Type A31A
valve is equipped with a fail-open actua-
tor, remove the actuator before instal-
ling the valve/actuator assembly or
cycle the valve into the fully closed
position. Then, take appropriate steps to
ensure that the actuator does not cause
the valve to open during installation.
1. The Type A31A valve is normally shipped as part
of an assembly with an actuator and other accessories
such as a valve positioner. If the valve and actuator
have been purchased separately or if the actuator has
been removed for maintenance, properly mount the
actuator and adjust valve/actuator travel and all travel
stops before inserting the valve into the line.
Follow the instructions in this manual for adjusting
travel stops. Also, refer to a separate actuator instruc-
tion manual for detailed actuator mounting and adjust-
ment procedures.
2. If not previously removed, remove the protective
end covers from the valve and inspect the valve body
to be certain that it is free of foreign material. Also, be

Type A31A
5
B2335–2/IL
Figure 2. Maximum Pressure/Temperature Ratings

Type A31A
6
Figure 2. Maximum Pressure/Temperature Ratings (continued)
B2336-1/ IL

Type A31A
7
Figure 3. Available Seal Configurations
B2334–1/IL
certain that adjacent pipelines are free of any foreign
material, such as pipe scale or welding slag that could
damage the valve seating surfaces.
CAUTION
The Type A31A valve is designed for
use with the appropriate piping sched-
ule for the specified ANSI class. Mini-
mum inside diameters for flanges or
pipe mating with valves are shown in
tables 3 and 4. Be certain to align the
valve accurately to avoid contact be-
tween the disk and the flanges. Improp-
er alignment or insufficient space for
disk rotation could result in damage to
the disk.
3. Select the appropriate gaskets for the application.
Flat sheet, spiral wound, or other gasket types, made
to ANSI B16.5 group or user’s standard, can be used
on the valves depending on the service conditions of
the application.
4. Refer to table 5 for the quantity and size of flange
bolts required.
Installing Wafer-Style Valves
WARNING
The edges of a rotating valve disk have
a shearing effect that may result in per-
sonal injury. To avoid personal injury,
keep clear of the disk edges when rotat-
ing the disk.
1. See figure 5 for recommended valve orientation.
See table 5 for flange bolt specifications. Install the
lower flange bolts first to form a cradle for the valve.
2. Properly orient the valve according to the specific
application. For optimum performance, install the valve
so that the shaft will be on the high pressure side of
the valve at shutoff. Install the valve and the gaskets
between the flanges into the cradle formed by the
flange bolts.
3. Install the remaining flange bolts, making sure to
center the gaskets on the gasket sealing surfaces of
the flange and body.
4. Tighten the flange bolts in an alternating criss-
cross fashion to a torque value of one-fourth of the
final bolting torque. Repeat this procedure several
times increasing the torque value each time by a

Type A31A
8
Table 5. Hex Head Screw, Stud Bolt and Cap Screw Data
(1)
VALVE
SIZE
NUMBER SIZE DIA. INCH &
THREAD LENGTH, INCH
SIZE,
INCH Class
150 Class 300 Class 150 Class 300 Class 150 Class 300
Single-Flange Style with Stud Bolts
3 4 8 5/8-11 3/4-10 5-3/4 6
4 8 8 5/8-11 3/4-10 6 6-1/2
6 8 12 3/4-10 3/4-10 6-1/2 7-1/2
8 8 12 3/4-10 7/8-9 7 9
10 12 16 7/8-9 1-8 8 10
12 12 16 7/8-9 1-1/8-8 8-1/2 11
Wafer-Style with Cap Screws
3 8 16 5/8-11 3/4-10 1-7/8 2
4 16 16 5/8-11 3/4-10 2 2-1/4
6 16 24 3/4-10 3/4-10 2 2-1/2
8 16 24 3/4-10 7/8-9 2-1/4 3
10 24 32 7/8-9 1-8 2-1/2 3
12 24 32 7/8-9 1-1/8-8 2-3/4 3-3/8
1. Thread engagement in accordance with ANSI B31.3 “Chemical Plant and
Petroleum Refinery Piping”.
fourth of the final desired torque. When the final torque
value has been applied, tighten each flange bolt again
to allow for gasket compression.
5. For hazardous atmosphere or oxygen service
valves, read the following Warning, and provide the
bonding strap assembly mentioned below if the valve
is used in an explosive atmosphere.
WARNING
The valve drive shaft is not necessarily
grounded to the pipeline when installed.
Personal injury or property damage
could result, if the process fluid or the
atmosphere around the valve is flam-
mable, from an explosion caused by a
discharge of static electricity from the
valve components. If the valve is
installed in a hazardous area, electrical-
ly bond the drive shaft to the valve.
Note
The packing is composed of all conduc-
tive packing rings (graphite ribbon
packing) to electrically bond the shaft to
the valve for hazardous area service or
non-conductive PTFE packing rings. For
oxygen service applications, provide al-
ternate shaft-to-valve body bonding ac-
cording to the following step.
6. Attach the bonding strap assembly (key 131,
figure 6) to the shaft with the clamp (key 130,
figure 6).
Figure 4. Optional Shaft-to-Valve Body Bonding Strap
Assembly
VALVE BODY ACTUATOR
A
AVIEW A-A
37A6528-A
A3143-2/IL
7. Connect the other end of the bonding strap assem-
bly to the valve flange cap screws.
8. For more information, refer to the Packing Mainte-
nance section below.
Installing Single-Flange Valves
WARNING
The edges of a rotating valve disk have
a shearing effect that may result in per-
sonal injury. To avoid personal injury,
keep clear of the disk edges when rotat-
ing the disk.
1. See figure 5 for recommended valve orientation.
See table 5 for hex head cap screw specifications.
2. Properly orient the valve according to the specific
application. For optimum performance, install the valve
for reverse flow.
3. Position the valve between the flanges. Be sure to
leave enough room for the flange gaskets. Install the
lower flange bolts.
4. Select the appropriate gaskets for the application.
Flat sheet, spiral wound, or other gasket types, made
to the ANSI B16.5 group standard or user’s standard,
can be used on the valve depending on the service
conditions of the application. Install the gaskets and
align the valve and the gaskets.
5. Install the remaining bolts.
6. Tighten the flange bolts in an alternating criss-
cross fashion to a torque value of one-fourth of the

Type A31A
9
Table 6. Torque Values for Fasteners
FASTENER NOMINAL SIZE
#10 1/4 5/16 3/8 7/16 1/2 9/16 5/8 3/4 7/8 1 1-1/8
Retainin
g
LbfSin LbfSft
Retaining
Ring 41 100 220 400 53 83 119 166 296 480 720 1000
Ring
Screws NSm
4.6 11 25 45 72 112 161 225 401 651 976 1356
G
LbfSin LbfSft
Gasket
Retaining
35 81 167 295 39 59 86 119 210 330 480 617
Retaining
Bolts
NSm
Bolts
4.0 9.2 19 33 53 80 117 161 286 447 651 837
Nore: These values are based upon standard materials, S66286/Inconel screws and ASTM A193GRB6 bolts. For other special fasterer materials, please contact your Fisher Controls
sales office or sales representative.
final bolting torque. Repeat this procedure several
times increasing the torque value each time by a
fourth of the final desired torque. When you get to the
final torque value, tighten each flange bolt again to
allow for gasket compression.
Maintenance
Valve parts are subject to normal wear and must be
inspected and replaced as necessary. The frequency
of inspection and replacement depends upon the se-
verity of service conditions. Because of the care Fish-
er Controls takes in meeting all manufacturing require-
ments (heat treating, dimensional tolerances, etc.),
use only replacement parts manufactured or furnished
by Fisher Controls.
WARNING
Avoid personal injury from sudden re-
lease of process pressure. Before per-
forming any maintenance operations:
DDisconnect any operating lines pro-
viding 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 either
side of the valve.
DVent the power actuator loading
pressure and relieve any actuator spring
precompression.
Figure 5. Properly Installed Wafer Style Valve
A5557/IL
DUse lock-out procedures to be sure
that the above measures stay in effect
while you work on the equipment.
Replacing Packing
The Type A31A valve is designed so the packing can
be replaced without removing the valve from the pro-
cess pipeline. Packing may be PTFE V-rings or graph-
ite.
If you are installing an ENVIRO-SEAL Packing System
in an existing valve, follow the instructions in the EN-
VIRO-SEAL Packing Instruction Manual (Form 5320).
To remove packing parts in a valve with the ENVIRO-
SEAL packing system, follow the procedures for
valves using ENVIRO-SEAL packing system in this
section.
For valves with PTFE or graphite packing:
Key numbers for the parts in this section may be found
in figure 7.

Type A31A
10
CAUTION
Tighten the packing flange only enough
to prevent shaft leakage. Excessive
tightening will only accelerate wear of
the packing and could produce higher
torques on the valve.
Usually, packing leakage can be eliminated by merely
tightening the hex nuts (key 15) located above the
packing flange while the valve is in the pipeline. How-
ever, if leakage continues, replace the packing.
CAUTION
Never use a wrench or pliers on the
valve shaft. A damaged shaft could cut
the packing and allow leakage.
1. Before loosening any parts, isolate the 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. Then, remove the hex nuts (key 15)
and lift off the packing flange (key 11).
2. Remove the hex jam nuts (key 17), anti-blowout
flange (key 10) and the packing follower (key 12). Also
remove the anti-blowout ring (key 16) using a needle-
nose pliers. The packing (key 13) is now accessible.
Refer to figure 6 for details of the blowout protection.
3. Use a packing extractor to remove packing. Insert
the corkscrew-like end of the tool into the first piece of
packing and pull firmly to remove the packing. Repeat
this process until all packing has been removed.
CAUTION
Be careful when cleaning the packing
box. Scratches to the shaft or inside di-
ameter of packing bore might cause
leakage.
4. Before installing new packing, clean the packing
box.
5. Install new packing (key 13) one ring at a time, us-
ing the packing follower (key 12) as a driver. If using
split-ring packing, stagger the splits in the rings to
avoid creating a leak path.
6. Reinstall all parts. Tighten the packing flange nuts
(key 15) as needed to stop leakage under operating
conditions.
For valves using the ENVIRO-SEAL packing
system:
Normally, the packing nuts should not require re-tight-
ening. However, when servicing an ENVIRO-SEAL
packing system, if the springs do not remain nearly
flat, retighten the packing box nuts until the springs
are almost completely compressed. If leakage contin-
ues, replace the packing components as described in
the following procedures. Keys numbers in this section
may be found in figure 7.
CAUTION
Be careful when cleaning the packing
box. Scratches to the shaft or inside di-
ameter of the packing bore may cause
leakage.
1. Before loosening any parts on the valve, isolate the
control valve from the line pressure and release pres-
sure from both sides of the valve body.
2. Loosen the two packing hex nuts evenly to remove
spring tension, then remove the nuts.
3. Remove the packing flange and spring stack. The
spring stack is held in place by an O-ring on the pack-
ing flange. Remove the two hex jam nuts and remove
the anti-blowout flange, packing flange, anti-blowout
ring, packing box ring, anti-extrusion washer, packing
set, and packing box ring.
CAUTION
The valve shaft surface condition is crit-
ical in making and maintaining a good
seal. If the valve shaft surface is
scratched, nicked, dented, or worn, re-
place the valve shaft before replacing
the packing system components.
4. Inspect the existing valve shaft. If necessary, re-
place the valve shaft as described in the procedures in
this section.
5. Install the new packing system components as de-
scribed in the ENVIRO-SEAL Packing Instruction
Manual (Form 5320).
Removing the Valve from the Pipeline
1. Disconnect any operating lines providing air pres-
sure, electric power, or a control signal to the actuator.
Be sure the actuator cannot suddenly open the valve.
Vent the power actuator loading pressure.
2. Use bypass valves or completely shut off the pro-
cess to isolate the valve from process pressure. Re-
lieve process pressure on both sides of the valve.
Drain the process media from either side of the valve.

Type A31A
11
CAUTION
Damage to the valve disk, piping or pipe
flanges can occur if the disk is not
closed when the valve is being removed
from the pipeline. If necessary, stroke
the actuator to place the disk in the
closed position while removing the
valve from the pipeline.
3. Loosen the flange bolting that holds the valve.
Make sure the valve cannot slip or twist while loosen-
ing and removing the bolting.
4. Make certain the valve disk is closed and remove
the valve from the pipeline. Support the valve properly
and move the valve to an appropriate work area.
Removing/Installing the Seal Ring
Unless otherwise indicated, key numbers and part
names are listed in figure 8.
Note
For larger valves, it is possible to re-
place the seal ring (key 5) while the ac-
tuator is mounted to the valve and can
be accomplished by cycling the valve to
90 degrees open.
1. After removing the valve from the pipeline, remove
the manual or power actuator. Manually rotate the
drive shaft (key 3) counterclockwise until the disk has
moved a full 180 degrees away from the closed posi-
tion.
2. Lay the valve flat on a work bench in a secure posi-
tion with the retaining ring (key 18) and retaining ring
screws (key 19) facing up. Properly secure the valve
on a suitable worktable so it can not slip, twist, or fall
during maintenance. Remove all retaining ring screws.
3. Remove the retaining ring by placing a socket head
retaining ring screw from the retaining ring in each of
the two retaining ring jacking screw holes. Slowly turn
the screws until the retaining ring has been lifted from
the valve body. Remove the retaining ring to expose
the seal ring in the T-slot area of the valve body.
Note
The Type A31A valve is available with
different seal designs and components.
See figure 3 to identify the specific seal
design.
4. Insert a regular screw driver or other similar tool
under the top edge of the seal ring (key 5), and gently
pry it out of the T-slot area in the valve body. Take
care not to damage the seal ring or T-slot area of the
valve body. After the seal ring has been removed,
clean the T-slot area, retaining ring, and, if required,
polish the disk thoroughly with fine steel wool or other
appropriate material.
PTFE Seal Installation
Unless otherwise indicated, key numbers and part
names are listed in figure 8.
A maintenance kit with installation tools is available
through your Fisher Controls representative or sales
office.
1. Locate the replacement seal ring (key 5) and note
the shape of the ring. The ring is wider across one
edge diameter and narrower across the other edge
diameter. Also, note the wide groove around the out-
side circumference.
Before installing the seal ring into the valve body,
place the backup ring (key 6) into the wide, outer
groove of the seal ring.
2. Install the seal ring and backup ring assembly in
the valve body. The wider outside diameter of the seal
ring, goes into the T-slot area of the valve body as
shown in figure 6. Start the edge with the wider diame-
ter into the T-slot of the valve body using a blunt-end
screwdriver. If a maintenance kit is available, use the
seal ring installation tools.
3. Carefully tuck the backup ring downward into the
valve body T-slot until the seal ring and backup ring
are completely entrapped in the valve body T-slot.
4. Completely seat the seal ring in the valve body T-
slot. Re-install the retaining ring (key 18) and retaining
ring screws (key 19). Tighten the screws just enough
to eliminate any movement of the retaining ring. Using
a blunt-end tool, carefully tuck the lip of the seal ring
under the retaining ring.
5. When the seal ring is under the lip of the retaining
ring, tighten the screws according to standard proce-
dures. Do not fully torque screws at this time. Final
tightening of the screws is accomplished in step 7.
6. Manually rotate the drive shaft (key 3) clockwise
180 degrees to return the disk (key 2) to its closed
position.
7. The final seating of the retaining ring cap screws
can now be done. For the screw torque values, refer
to table 6. The seal is now completely installed and the
valve may be placed in service.

Type A31A
12
Novex Seal and Phoenix III Fire-Tested
Seal Installation
Unless otherwise indicated, key numbers and part
names are listed in figure 8.
A maintenance kit with installation tools is available
through your Fisher Controls representative or sales
office.
1. Locate the replacement seal ring (key 5) and note
the shape of the ring. The ring is wider across one
edge diameter and narrower across the other edge
diameter. Also, note the wide groove around the out-
side circumference.
Before installing the seal ring into the valve body,
place the backup ring (key 6) into the wide, outer
groove of the seal ring.
2. Install the seal ring and backup ring assembly in
the valve body. The wider outside diameter of the seal
ring goes into the T-slot area of the valve body as
shown in figure 6. Start the edge with the wider diame-
ter into the T-slot of the valve body using a blunt-end
screwdriver. If a maintenance kit is available, use the
seal ring installation tools. Do not use the screwdriver
or seal ring tool directly on the metal seat. Use the tool
only on the backup ring.
3. Carefully tuck the backup ring downward into the
valve body T-slot until the seal ring and backup ring
are completely entrapped in the valve body T-slot.
Note
On larger valves, it may be more effi-
cient to have someone hold down the
seal ring while you push the backup
ring into the T-slot.
4. Once the seal ring and backup ring have been fully
installed into the valve body T-slot, the retaining ring
gasket can be installed. This gasket is a thin graphite
material. Use extreme care to avoid damaging the
gasket while punching one initial screw hole through
the gasket for alignment.
5. Install the retaining ring, and align the screw holes
in the retaining ring with the holes in the valve body.
Install the first retaining ring screw through the
punched hole in the retaining ring gasket. Install the
other retaining ring screws by pushing them through
the graphite gasket and threading them into the valve
body.
6. Tighten the retaining ring screws just enough to
eliminate any movement of the retaining ring. Do not
over-tighten the retaining ring screws.
Figure 6. Typical Seal Installation
A5251-1*/IL
WARNING
Avoid personal injury or property dam-
age caused by the impact of a falling or
tipping valve. Support large valves dur-
ing maintenance.
7. To complete this step, stand the valve up. Support
the valve securely using methods appropriate for the
valve size. If a vise or other clamps are being used,
make certain the flange gasket sealing area of the
valve body is not damaged.
8. Manually rotate the drive shaft (key 3) to turn the
disk clockwise to meet the seal ring.
9. Place a piece of rubber, or other soft material, be-
tween the disk and internal travel stop to protect the
disk. With a rubber mallet, tap the disk until it contacts
the internal travel stop. When the disk makes contact
with the stop, manually rotate the disk counterclock-
wise back out of the seal ring to a 90-degree open
position.
10. The final seating of the retaining ring screws can
now be done. For the screw torque values, refer to
table 6.
11. Repeat steps 8 and 9 two more times.
Note
When attaching the actuator to the
valve, make sure the valve disk is not in
contact with the internal travel stop. The
valve disk should be positioned from
0.001 to 0.030 inch (0.03 to 0.76 mm)
away from the internal stop in the valve
body.

Type A31A
13
12. Use an appropriate tool (such as a feeler gauge)
and position the disk from 0.001 to 0.030 inch (0.03 to
0.76 mm) away from the internal stop in the valve
body.
This adjustment is necessary to be certain that the
actuator output torque is fully absorbed by the actuator
travel stop or by the actuator. The internal travel stop
in the valve body should not absorb any of the actua-
tor torque.
Cryogenic Seal Installation
Unless otherwise indicated, key numbers and part
names are listed in figure 8.
A maintenance kit with installation tools is available
through your Fisher Controls representative or sales
office.
1. Locate the replacement seal ring (key 5) and note
the shape of the ring. The ring is wider across one
edge diameter and narrower across the other edge
diameter. Also, note the wide groove around the out-
side circumference. If an aluminum backup ring is pro-
vided, fit this over the back of the seal ring (matching
seal and backup ring angles) prior to installation in the
valve.
2. Install the seal ring (key 5) in the valve body by first
placing the wider outside diameter of the seal ring into
the T-slot area of the valve body as shown in figure 6.
3. Once the seal ring has been fully installed into the
body T-slot, the retaining ring gasket can be installed.
This gasket is a thin graphite material. Use extreme
care to avoid damaging the gasket while punching one
initial screw hole through the gasket for alignment.
4. Install the retaining ring, and align the screw holes
in the retaining ring with the holes in the valve body.
Install the first retaining ring screw through the
punched hole in the retaining ring gasket. Install the
other retaining ring screws by pushing them through
the graphite gasket and threading them into the valve
body.
5. Tighten the retaining ring screws just enough to
eliminate any movement of the retaining ring. Do not
over-tighten the retaining ring screws.
WARNING
Avoid personal injury or property dam-
age caused by the impact of a falling or
tipping valve. Support large valves dur-
ing maintenance.
6. To complete this step, stand the valve up. Support
the valve securely using methods appropriate for the
valve size. If a vise or other clamps are being used,
make certain the flange gasket sealing area of the
valve body is not damaged.
7. Manually rotate the drive shaft (key 3) to turn the
disk clockwise to meet the seal ring.
8. Place a piece of rubber, or other soft material, be-
tween the disk and internal travel stop to protect the
disk. With a rubber mallet, tap the disk until it contacts
the internal travel stop. When the disk makes contact
with the stop, manually rotate the disk counterclock-
wise back out of the seal ring to a 90-degree open
position.
9. The final seating of the retaining ring screws can
now be done. For the screw torque values, refer to
table 6.
10. Repeat steps 7 and 8 two more times.
Note
When attaching the actuator to the
valve, make sure the valve disk is not in
contact with the internal travel stop. The
valve disk should be positioned from
0.001 to 0.030 inch (0.03 to 0.76 mm)
away from the internal stop in the valve
body.
11. Use an appropriate tool (such as a feeler gauge)
and position the disk from 0.001 to 0.030 inch (0.03 to
0.76 mm) away from the internal stop in the valve
body.
This adjustment is necessary to be certain that the
actuator output torque is fully absorbed by the ac-
tuator travel stop or by the actuator. The internal
travel stop in the valve body should not absorb any of
the actuator torque.

Type A31A
14
Figure 7. Anti-Blowout Protection Detail
C0766/ IL
Anti-Blowout Protection, Packing, Valve
Shaft(s), Disk, and Bearing Maintenance
Note
The 10- through 12-inch class 150
valves and 8- through 12-inch class 300
valves have a two-piece shaft. The shaft
with the keyed end is called the drive
shaft. The shaft opposite the drive shaft
is called the follower shaft.
The 3- through 8-inch class 150 valves
and 3 through 6-inch class 300 valves
have a one-piece shaft. This one-piece
shaft is keyed and is called the drive
shaft.
Removal
WARNING
The edges of a rotating valve disk (key
2) have a shearing effect that might re-
sult in personal injury. To avoid person-
al injury, keep clear of the disk edges
when rotating the disk.
CAUTION
When removing the actuator from the
valve, do not use a hammer or similar
tool to drive the lever off the valve shaft.
Driving the lever or actuator off the
valve shaft could damage the valve in-
ternal parts.
If necessary, use a wheel puller to re-
move the lever or actuator from the
valve shaft. It is okay to tap the wheel
puller screw lightly to loosen the lever
or actuator, but hitting the screw with
excessive force could also damage in-
ternal valve parts.
Never use a wrench or pliers on the
drive shaft. A damaged shaft could cut
the packing and allow leakage.
Unless otherwise indicated, key numbers and part
names are listed in figure 9.
1. Remove the actuator and valve, as an assembly,
from the pipeline, and then remove the actuator from
the valve.
Note
It is not necessary to remove the retain-
ing ring and seal ring when removing
the shaft(s) and disk.
2. Secure the valve in an upright position. Rotate the
disk (key 2) 180 degrees counterclockwise from the
fully closed position by manually turning the drive
shaft.
3. Removing the Anti-Blowout Protection (refer to fig-
ure 7):
a. For PTFE or Graphite Packing: Remove the
hex nuts and pull off the packing flange. Remove
the hex jam nuts and the anti-blowout flange. Re-
move the packing follower.
b. For ENVIRO-SEAL Packing System: Evenly
loosen and remove the two packing hex nuts, the
packing flange, the spring stack, the two hex jam
nuts, the anti-blowout flange, and the packing fol-
lower.
4. Remove the anti-blowout ring from around the drive
shaft using a needle nose pliers.

Type A31A
15
Note
3- through 12-inch valve sizes (classes
150 and 300) have a bearing stop (key 8,
figure 8) pressed into the bearing bore
immediately after the packing box.
Do not attempt to remove the bearing
stop which is found in the drive shaft
bearing bore immediately after the pack-
ing box. The bearing stop is pressed
into the bearing bore. If the bearing stop
needs replacement, contact your Fisher
Controls sales office or sales represen-
tative for more information.
5. Remove the packing from around the drive shaft.
Note
Different valves require slightly different
procedures because different valve
sizes/ pressure classes have different
methods of connecting the disk and
shaft(s). To identify the proper proce-
dures, refer to the list below.
DClass 150, 3- through 8-inch sizes:
One-piece shaft with 1 taper key.
DClass 150, 10- and 12-inch sizes:
Two-piece shaft. 1 taper key in the drive
shaft; 1 disk pin in the follower shaft.
DClass 300, 3- through 6-inch sizes:
One-piece shaft with 1 taper key.
DClass 300, 8- and 10-inch sizes:
Two-piece shaft. 1 taper key in the drive
shaft; 1 disk pin in the follower shaft.
DClass 300, 12-inch size: Two-piece
shaft with 2 tangential pins in the drive
shaft; 1 disk pin in the follower shaft.
6. Proceed as appropriate, using the following instruc-
tions.
For valves with taper key(s), locate the taper key(s)
(key 9, figure 8) which runs through the drive shaft
boss on the back of the valve disk. Using a pin punch
on the smaller end of the key, drive it out of the disk
and shaft. Driving a taper key in the wrong direction
will tighten it.
Note
Certain valve sizes may have a taper key
that is arc spot welded in place. To re-
move the key, use a punch on the small-
er end of the taper key and drive it out
of the disk and shaft, breaking the weld.
For valves with tangential pins and/or disk pins,
locate the tangential pins (key 26) in the drive shaft
(key 3) and the disk pin (key 26) in the follower shaft
(key 4).
a. If a maintenance kit is available, use the pin ex-
tractor to remove the disk pins. Select the correct
size pin extractor tip with screws of proper thread
size to match the thread size in the disk pins. If a
maintenance kit is not available, see steps c and d
below.
b. Screw the pin extractor tip into the pin as far as
possible. With an upward, straight sliding motion,
pull out the pin. Repeat the same procedure for the
other pins.
c. Use a threaded rod with an appropriate spacer
and nut as an extractor tool. If using a threaded
rod, choose a rod with threads that fit the inside
thread of the pins. The rod should extend several
inches above the disk when it is screwed into a pin.
d. After screwing the rod into the pin, slide the
spacer over the rod and pin. Thread the nut onto
the rod and tighten it. As the nut is tightened, the
nut will drive the spacer against the disk. The in-
creasing force will draw the pin from the disk.
7. Valves with a two-piece shaft have a gasket retain-
er and gasket (keys 20 and 21) on the follower shaft
side of the valve. Remove the hex head bolts and
lockwashers (keys 23 and 22) from the gasket retainer
and remove the gasket retainer and gasket to expose
the end of the follower shaft.
8. Support the valve disk properly, and remove the
follower shaft. Pull the follower shaft from the valve
body. Use a shaft extractor screwed into the puller
hole in the end of the follower shaft.
9. Support the valve disk properly, and remove the
drive shaft. Pull out the drive shaft (key 3) by hand-
pulling or by using a shaft extractor screwed into the
end of the shaft.
CAUTION
To avoid damage to the disk, seal ring,
and T-slot area, do not force the disk
past the seal or T-slot area. Remove the
disk from the opposite side of the valve
body.
10. After removing the shaft(s), remove the disk and
the thrust bearings. Do not force the disk past the seal
ring or T-slot area.
11. Remove the journal bearings (key 7). Using a suit-
able punch or puller, drive or pull the journal bearing(s)
into the valve body bore from the drive shaft bearing

Type A31A
16
bore. Do not attempt to remove the bearing stop
(key 8). Remove the journal bearing from the follower
shaft bearing bore.
12. Inspect the valve body bore, bearings, bearing
bores, and packing box for damage.
Installing a One-Piece Shaft
Unless otherwise indicated, key numbers and part
names are listed in figure 8.
1. Secure the valve in an upright position. Allow for
easy access to the valve body bore. Allow for easy
access to the drive shaft bearing bore.
2. Inspect all parts removed from the valve for wear
or damage. Replace any worn or damaged parts.
Clean the valve body and all parts to be installed with
an appropriate solvent or degreaser.
CAUTION
Premature valve failure and loss of pro-
cess control may result if bearings are
improperly installed or are damaged
during installation.
3. Using caution to prevent damage to the bearing,
insert one journal bearing (key 7) from the valve body
bore into the drive shaft bearing bore until it hits the
bearing stop (key 8). When properly installed, a por-
tion of the journal bearing will extend into the valve
body bore.
4. Insert one journal bearing from the valve body bore
into the shaft bearing bore opposite the journal bearing
installed in step 3. When correctly installed, this jour-
nal bearing will be flush with the valve body bore.
5. Install the valve disk by placing the disk into the
valve body bore so the curved side of the disk passes
through the end of the valve body that does not con-
tain the T-slot. Align the shaft bore in the disk with the
bearing bores.
6. Insert the drive shaft end opposite the keyed end
into the valve body through the packing box. Push the
shaft through the bearing stop. Taking care not to dis-
lodge the journal bearing, push the shaft through the
journal bearing and the valve disk and into the bore on
the opposite side of the valve body.
CAUTION
To avoid damage to the taper key, tan-
gential pins, disk pins, valve disk, or
shaft(s) resulting from the application of
excessive force, use appropriate care
when driving the key or pins into the
disk hub and shaft(s). Use the right tool.
Do not use excessive force.
7. Be sure the taper key disk shaft joint is free of oil or
grease. If necessary, remove any excess welding ma-
terial from the taper key.
8. Align the taper key hole in the shaft with the holes
in the shaft boss on the disk. Insert the taper key. Use
a flat-end punch to drive the taper key until solid con-
tact is felt. Measure the depth of the taper key head
for a reference during the following steps.
a. Drive the taper key in farther as follows:
Valve Size, Inches Minimum Depth to Drive Taper
key After Initial Solid Contact,
Inches (mm)
ANSI Class 150 and 300,
size 3, 4, 6-inch valves, &
8-inch ANSI Class 150 valves 0.188 (5 mm)
b. The disk shaft, and taper key assembly must be
inspected to verify that the taper key spans the en-
tire shaft flat width. If so, this procedure is com-
plete. If not, the taper key must be driven in farther
until this condition is satisfied. However, do not ex-
ceed the following depth limits:
Valve Size, Inches Minimum Allowable Depth to
Drive Taper key After Initial
Solid Contact, Inches (mm)
3, and 4-inch ANSI Class 150/300 0.281 (7 mm)
6-inch ANSI Class 300, and
8-inch ANSI Class 150 0.312 (8 mm)
9. After driving the taper key in place, arc spot weld
the head of the taper key to the disk as shown in fig-
ure 8. For valve sizes 3-, 4-, and 6-inch, use an arc
spot weld bead of 1/8-inch diameter. For valve
sizes 8-, 10-, and 12-inch sizes, use an arc spot weld
bead of 3/16-inch diameter.
10. Install the packing as described in the Packing
Replacement section or in the ENVIRO-SEAL Packing
Instruction Manual (Form 5320).
Installing a Two-Piece Shaft
Unless otherwise indicated, key numbers and part
names are listed in figure 9.
1. Secure the valve in an upright position. Allow for
easy access to the valve body bore. Allow for easy
access to the drive shaft bearing bore and the follower
shaft bearing bore.
2. Inspect all parts removed from the valve for wear
or damage. Replace any worn or damaged parts.
Clean the valve body and all parts to be installed with
an appropriate solvent or degreaser.

Type A31A
17
CAUTION
Premature valve failure and loss of pro-
cess control may result if bearings are
improperly installed or are damaged
during installation.
3. Using caution to prevent damage to the bearings,
insert the required number of journal bearings (key 7)
from the valve body bore into the drive shaft bearing
bore. When properly installed, one end of the journal
bearing(s) will be flush with the interior end of the
packing box, the other end of the journal bearing(s)
will be flush with the valve body bore.
The drive shaft thrust bearing (key 24) will be installed
in step 5.
4. Insert one journal bearing from the valve body bore
into the follower shaft bearing bore so it is flush with
the valve body bore.
5. Insert the drive shaft into the valve body through
the packing box. Push the drive shaft through the jour-
nal bearing. Hold the drive shaft thrust bearing (key
24) in the valve body bore against the opening of the
drive shaft bearing bore. Push the drive shaft through
the bearing bore just enough to hold the thrust bear-
ing.
6. Insert the follower shaft through the bore in the
valve body uncovered by removal of the gasket retain-
er. Hold the follower shaft thrust bearing (key 24) in
the valve body bore against the opening of the follower
shaft bearing bore. Push the follower shaft through the
bearing bore just enough to hold the thrust bearing.
7. Install the valve disk. Place the flat side of the disk
on a flat surface. Then, move the valve body from its
upright position and suspend the valve body over the
disk so the seal ring/T-slot area is facing up. Align the
shaft bores through the disk with the drive shaft and
follower shaft bores. Lower the valve body over the
disk using caution not to dislodge or damage the thrust
bearings placed on the ends of the shafts.
8. With the valve disk properly positioned in the valve
body, push the drive shaft and follower shaft the rest
of the way through the thrust bearings and into the
shaft bores in the valve disk.
9. Align the holes in the shafts with the holes in the
disk.
CAUTION
To avoid damage to the taper key, tan-
gential pins, disk pins, valve disk, or
shaft(s) resulting from the application of
excessive force, use appropriate care
when driving the key or pins into the
disk hub and shaft(s). Use the correct
tool, and do not use excessive force.
10. Before installing the taper key, be sure the taper
key disk shaft joint is free of oil or grease. If neces-
sary, remove any excess welding material from the
taper key.
11. Install the appropriate taper key, tangential pins,
and disk pins (see table 11).
12. Install the taper key by aligning the taper key hole
in the shaft with the holes in the shaft boss on the
disk. Insert the taper key. Use a pin punch to drive the
taper key until solid contact is felt. Measure the depth
of the taper key head for a reference during the follow-
ing steps.
a. Drive the taper key in farther as follows:
Valve Size, Inches Minimum Depth to Drive Taper
key After Initial Solid Contact,
Inches (mm)
8-inch ANSI Class 300,
10- and 12-inch ANSI Class 150,
& 10-inch ANSI Class 300 valves 0.219 (6 mm)
b. The disk shaft, and taper key assembly must be
inspected to verify that the taper key spans the en-
tire shaft flat width. If so, this procedure is com-
plete. If not, the taper key must be driven in farther
until this condition is satisfied. However, do not ex-
ceed the following depth limits:
Valve Size, Inches Minimum Allowable Depth to
Drive Taper key After Initial
Solid Contact, Inches (mm)
8-inch ANSI Class 300, and
10- and 12-inch ANSI Class 150 0.375 (10 mm)
10-inch ANSI Class 300 0.406 (11 mm)
13. After driving the taper key in place, arc spot weld
the head of the taper key to the disk as shown in fig-
ure 8. For valve sizes 10- and 12-inch, use an arc spot
weld bead of 3/16-inch in diameter. packing box.
Install the packing around the drive shaft.
14. Install the packing as described in the Packing
Replacement section or in the ENVIRO-SEAL Packing
Instruction Manual (Form 5320).
Installing the Gasket Retainer
Valves with a two-piece shaft use a gasket retainer
and gasket to cover the follower shaft opening in the
valve body.
1. Replace the gasket (key 21) and gasket retainer
(key 20) over the end of the follower shaft. Use a new
gasket.
2. Replace the four hex head bolts (key 23) and lock-
washers (key 22) to hold the gasket retainer in place.

Type A31A
18
3. Be sure to center the gasket over the follower shaft
bore before retightening the bolts. Tighten down the
bolts evenly in a crossover or star pattern. Refer to
table 6 for proper torque values.
Parts Ordering
When replacement parts are required, always use
genuine Fisher Controls parts.
When corresponding with your Fisher Controls repre-
sentative or sales office about the Type A31A valve,
always provide the valve serial number. For valve/ac-
tuator combinations assembled at the factory, the
valve serial number is stamped on the nameplate at-
tached to the actuator.
Parts Reference
Key Description
1 VALVE BODY
2 DISK
3 DRIVE SHAFT
4 FOLLOWER SHAFT
5 SEAL RING
6 BACKUP RING
Key Description
7 JOURNAL BEARING
8 BEARING STOP
10 ANTI-BLOWOUT FLANGE
11 PACKING FLANGE
12 PACKING FOLLOWER
13 PACKING
14 STUD
15 HEX NUT
16 ANTI-BLOWOUT RING
17 HEX JAM NUT
18 RETAINING RING
19 RETAINING RING SCREW
20 GASKET RETAINER
21 GASKET
22 LOCKWASHER,
23 HEX HEAD BOLT
24 THRUST BEARING
25 KEY (FOR DRIVE SHAFT)
26 TANGENTIAL PIN OR DISK PIN
27 RETAINING RING GASKET, GRAPHITE
29 NAMEPLATE (NOT SHOWN)
30 DRIVE SCREW (NOT SHOWN)
33 FLOW DIRECTION ARROW (NOT SHOWN)

Type A31A
19
Figure 8. Type A31A 3 through 12-inch Typical Assembly
A5947/IL
27291
27301
C0821/ IL


(WAFER STYLE SHOWN)

Type A31A
20
For information, contact Fisher Controls:
Marshalltown, Iowa 50158 USA
Cernay 68700 France
Sao Paulo 05424 Brazil
Singapore 128461
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Printed in U.S.A.
EFisher Controls International, Inc. 1998; All Rights Reserved
Posi-Seal, Phoenix III, ENVIRO-SEAL, NOVEX, Fisher, Fisher-Rosemount, and Managing The Process Better are marks owned by Fisher Controls International, Inc. or Fisher-Rose-
mount Systems, Inc. All other marks are the property of their respective owners.