Emerson Fisher POSI-SEAL A31A User manual

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Fisher™POSI-SEAL™A31A High Performance
Butterfly Valve NPS 3 through 12
Contents
Introduction 1.................................
Scope of Manual 1.............................
Specifications 2...............................
Description 2.................................
Educational Services 3.........................
Installation 3..................................
Adjusting the Actuator Travel Stops or Travel 3.....
Valve Orientation 5............................
Preparing for Installation 6......................
Installing Wafer‐Style Valves 9...................
Installing Single‐Flange Valves 11................
Maintenance 11................................
Replacing Packing 12..........................
Removing the Valve from the Pipeline 13..........
Removing/Installing the Seal Ring 14.............
PTFE Seal Installation 14....................
NOVEX Seal and Phoenix III Fire‐Tested
Seal Installation 15......................
Cryogenic Seal Installation 16................
Anti‐Blowout Protection, Packing, Valve Shaft(s),
Disk, and Bearing Maintenance 18.............
Removal 18...............................
Installing a One‐Piece Shaft 20...............
Installing a Two‐Piece Shaft 21...............
Installing the Gasket Retainer 23.............
Figure 1. Typical Fisher A31A Valve
W5812‐1
W5811‐1
Parts Ordering 23...............................
Parts List 23..................................
Introduction
Scope of Manual
This instruction manual provides installation, maintenance, and parts ordering information for the Fisher POSI‐SEAL
A31A high‐performance butterfly valves. Figure 1 shows typical A31A valves. For information regarding actuators and
accessories, refer to separate instruction manuals.
Do not install, operate, or maintain A31A valves without being fully trained and qualified in valve, actuator, and
accessory installation, operation, and maintenance. To avoid personal injury or property damage, it is important to
carefully read, understand, and follow all the contents of this manual, including all safety cautions and warnings. If you
have any questions about these instructions, contact your Emerson sales office before proceeding.
Instruction Manual
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A31A Valve
February 2019

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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
NPS J3, J4, J6, J8, J10, J12
End Connection Style
JFlangeless, wafer‐style or Jsingle flange valve
body designed to fit between raised‐face mating
flanges per ASME B16.5 CL150 or CL300
Maximum Inlet Pressure/Temperature(4)
Consistent with ASME JCL150 and JCL300
pressure/temperature ratings per ASME B16.34. Also,
see figure 2 for additional information.
Available Seal Configurations
JStandard soft seal ring (PTFE) with fluorocarbon or
EPR backup ring, JNOVEX seal ring, CL150,
(S31600, 316 SST)(1) JNOVEX seal ring, CL300,
standard pressure rating (S31600, 316 SST)(1)
JNOVEX seal ring, CL300, high pressure rating
(S21800), JPhoenix III fire‐tested seal ring (S31600,
316 SST) with resilient insert (PTFE) and backup ring
(fluorocarbon), or Jcryogenic seal ring (CTFE) 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 CL150
or 300 raised‐face flanges
Shutoff Classification. Per ANSI/FCI 70‐2
Standard Soft Seal: Bidirectional bubble‐tight shutoff
NOVEX Seal: Unidirectional shutoff Class V (reverse
flow direction only)
Phoenix III Seal: Bidirectional bubble‐tight shutoff
Phoenix III Seal for Fire‐Tested Applications: Consult
your Emerson sales office for fire tested performance
Cryogenic seal applications: Consult your Emerson
sales office
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‐diaphragm, or Jpneumatic piston
Disk Rotation
Clockwise to close
1. For specific information about materials of construction, contact your nearest Emerson sales office.
2. The pressure/temperature limits in this manual, and any applicable code or standard limitation, should not be exceeded.
Description
The A31A high‐performance butterfly valve features a keyed drive shaft. The keyed shaft combines with a variety of
handlevers, handwheels, pneumatic piston or spring‐and‐diaphragm actuators to make the A31A a reliable,
high‐performance, butterfly valve for a variety of applications in the various process industries.
The A31A is available in either a flangeless (wafer) or a single‐flange (lugged) valve design, with a variety of seal, valve
body, and internal components. The A31A valve features a 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 ASME class pressure range for the specific valve type.

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Educational Services
For information on available courses for the Fisher POSI-SEAL A31 NPS 3 through 12 butterfly valve, as well as a variety
of other products, contact:
Emerson Automation Solutions
Educational Services - Registration
Phone: [phone] or 1-800-338-8158
E-mail: [email protected]
emerson.com/fishervalvetraining
Installation
WARNING
Always wear protective gloves, clothing, and eyewear when performing any installation operations to avoid personal
injury.
To avoid personal injury or property damage resulting from the sudden release of pressure, do not install the valve
assembly where service conditions could exceed the limits given in this manual or on appropriate nameplates. Use
pressure‐relieving devices as required by government or accepted industry codes and good engineering practices.
Check with your process or safety engineer for any additional measures that must be taken to protect against process
media.
If installing into an existing application, also refer to the WARNING at the beginning of the Maintenance section in this
instruction manual.
CAUTION
The valve configuration and construction materials are selected to meet particular pressure, temperature, pressure drop,
and controlled fluid conditions. Because pressure drop and temperature range capabilities limit some combinations of
materials, do not apply any other conditions to the valve without first contacting your Emerson sales office.
The maximum allowable inlet pressures for 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 personal injury. To avoid personal injury, keep
clear of the disk edges when rotating the disk.

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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 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
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.
Table 2. Material Temperature Ratings
COMPONENT, ASME CLASS, MATERIAL OF CONSTRUCTION TEMPERATURE RANGE
_F_C
Seal Ring See Figure 2
Backup Ring
Soft Seal Fluorocarbon
EPR
Nitrile
PTFE
Chloroprene
Phoenix III Seal Fluorocarbon
EPR
Nitrile
Chloroprene
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
N05500
N07718
S20910
‐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 Emerson sales office.
3. PEEK stands for PolyEtherEtherKetone
4. CoCr‐A hardfacing degrades shutoff performance of the seal. Consult your Emerson sales office.

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Valve Orientation
Note
The NPS 10 through 12 CL150 valves and NPS 8 through 12 CL300 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 NPS 3 through 8 CL150 valves and NPS 3 through 6 CL300 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 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.
Table 3. Valve Body Data, CL150
VALVE SIZE,
NPS
SHAFT DIAMETER
AT YOKE BEARING
FACE‐TO‐FACE
DIMENSION(1)
MINIMUM
I.D.(2)
APPROXIMATE WEIGHT,
KILOGRAMS
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
VALVE SIZE,
NPS
SHAFT DIAMETER
AT YOKE BEARING
FACE‐TO‐FACE
DIMENSION(1)
MINIMUM
I.D.(2)
APPROXIMATE WEIGHT,
POUNDS
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
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.
The A31A valve is designed for installation with the shaft(s) in any orientation around the pipeline: horizontal, vertical,
or at an intermediate angle. However, when installing the valve in certain services, follow the recommendations
below, which are based on application experience:
D In certain services (process fluids with high concentrations of entrained solids, abrasive slurries, polymerizing
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 enhance valve performance.
D Install 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 Emerson sales office.

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Table 4. Valve Body Data, CL300
VALVE SIZE,
NPS
SHAFT DIAMETER
AT YOKE BEARING
FACE‐TO‐FACE
DIMENSION(1)
MINIMUM
I.D.(2)
APPROXIMATE WEIGHT,
KILOGRAMS
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
VALVE SIZE,
NPS
SHAFT DIAMETER
AT YOKE BEARING
FACE‐TO‐FACE
DIMENSION(1)
MINIMUM
I.D.(2)
APPROXIMATE WEIGHT,
POUNDS
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
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 during installation, the valve must be in the fully‐closed position. If the A31A valve is
equipped with a fail‐open actuator, remove the actuator before installing 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 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 instruction manual
for detailed actuator mounting and adjustment 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 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 A31A valve is designed for use with the appropriate piping schedule for the specified ASME class. Minimum 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 between the disk and the flanges. Improper 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 ASME
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.

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Figure 2. Maximum Pressure/Temperature Ratings
B2335-2
NOTE
BECAUSE OF POTENTIAL EROSIVE EFFECTS AND PREMATURE SEAL FAILURE THAT CAN OCCUR, THROTTLING PTFE SEALS AT DIFFERENTIAL PRESSURES GREATER THAN 300 PSID AT DISK ANGLES
LESS THAN 20 DEGREES OPEN IS NOT RECOMMENDED.
TEMPERATURE LIMITATIONS DO NOT ACCOUNT FOR THE ADDITIONAL LIMITATIONS IMPOSED BY THE BACKUP RING USED WITH THIS SEAL TO DETERMINE THE EFFECTIVE TEMPERATURE
LIMITATION OF THE APPROPRIATE SEAL/BACKUP RING COMBINATION, REFER TO TABLE 3.
CL300, NOVEX SEAL
CL150, NOVEX SEAL
CL300, SOFT SEALCL150, SOFT SEAL
OPERATING TEMPERATURE, _COPERATING TEMPERATURE, _C
OPERATING TEMPERATURE, _C
OPERATING TEMPERATURE, _C
OPERATING TEMPERATURE, _F
OPERATING TEMPERATURE, _F
OPERATING TEMPERATURE, _FOPERATING TEMPERATURE, _F
S31600 SST
S31600 SST
S21800
1
2

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Figure 2. Maximum Pressure/Temperature Ratings (continued)
B2336-1
NOTE
TEMPERATURE LIMITATIONS DO NOT ACCOUNT FOR THE ADDITIONAL LIMITATIONS IMPOSED BY THE BACKUP RING USED WITH THIS SEAL TO DETERMINE THE EFFECTIVE TEMPERATURE
LIMITATION OF THE APPROPRIATE SEAL/BACKUP RING COMBINATION, REFER TO TABLE 3.
CL300, CRYOGENIC SEAL
CL300, PHOENIX III SEAL
OPERATING TEMPERATURE, _C
OPERATING TEMPERATURE, _C
OPERATING TEMPERATURE, _C
OPERATING TEMPERATURE, _F
OPERATING TEMPERATURE, _F
OPERATING TEMPERATURE, _F
S21800
S21800
2
CL150, CRYOGENIC SEAL OPERATING TEMPERATURE, _F
OPERATING TEMPERATURE, _C
CTFE CTFE
CL150, PHOENIX III SEAL

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Figure 3. Available Seal Configurations
B2334-1
1
NOTE
FOR OPTIMUM SEAL PERFORMANCE, THE PREFERRED VALVE ORIENTATION AT SHUTOFF IS WITH THE RETAINING RING DOWNSTREAM FROM THE HIGH PRESSURE SIDE OF THE VALVE.
BACKUP
RING
BACKUP
RING
RETAINING
RING
RETAINING
RING
RETAINING
RING
RETAINING
RING
SEAL RING
METAL
SEAL RING
NOVEX
SEAL RING
GRAPHITE
GASKET
GRAPHITE
GASKET
GRAPHITE
GASKET
HIGH PRESSURE
AT SHUTOFF
HIGH PRESSURE
AT SHUTOFF
HIGH PRESSURE
AT SHUTOFF HIGH PRESSURE
AT SHUTOFF
BODY BODY
BODY BODY
VALVE DISK VALVE DISK
VALVE DISK VALVE DISK
T-SLOT
CRYOGENIC
SEAL RING
RESILIENT INSERT
SOFT SEAL WITH
BACKUP O-RING CRYOGENIC SEAL
NOVEX SEAL PHOENIX III
FIRE-TESTED SEAL
Installing Wafer‐Style Valves
WARNING
The edges of a rotating valve disk have a shearing effect that may result in personal injury. To avoid personal injury, keep
clear of the disk edges when rotating 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 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.

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Figure 4. Optional Shaft‐to‐Valve Body Bonding Strap Assembly
VALVE BODY ACTUATOR
A
A
VIEW A‐A
37A6528‐A
A3143‐2
Table 5. Hex Head Screw, Stud Bolt and Cap Screw Data(1)
VALVE SIZE, NPS NUMBER SIZE DIA. INCH & THREAD LENGTH, INCH
CL150 CL300 CL150 CL300 CL150 CL300
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 ASME B31.3 “Chemical Plant and Petroleum Refinery Piping”.
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 flammable, from an explosion caused by a discharge of
static electricity from the valve components. If the valve is installed in a hazardous area, electrically bond the drive shaft to
the valve.
Note
The packing is composed of all conductive 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 alternate shaft‐to‐valve
body bonding according to the following step.

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6. Attach the bonding strap assembly (key 131, figure 6) to the shaft with the clamp (key 130, figure 6).
7. Connect the other end of the bonding strap assembly to the valve flange cap screws.
8. For more information, refer to the Packing Maintenance section below.
Installing Single‐Flange Valves
WARNING
The edges of a rotating valve disk have a shearing effect that may result in personal injury. To avoid personal injury, keep
clear of the disk edges when rotating 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
ASME 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 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.
Table 6. Torque Values for Fasteners
FASTENER NOMINAL SIZE
Retaining
Ring
Screws
#10 1/4 5/16 3/8 7/16 1/2 9/16 5/8 3/4 7/8 1 1‐1/8
LbfSin LbfSft
41 100 220 400 53 83 119 166 296 480 720 1000
NSm
4.6 11 25 45 72 112 161 225 401 651 976 1356
Gasket
Retaining
Bolts
LbfSin LbfSft
35 81 167 295 39 59 86 119 210 330 480 617
NSm
4.0 9.2 19 33 53 80 117 161 286 447 651 837
Note: These values are based upon standard materials, S66286/N07718 screws and ASTM A193GRB6 bolts. For other special fastener materials, please contact your Emerson sales office.
Maintenance
WARNING
Avoid personal injury from sudden release of process pressure. Before performing any maintenance operations:
D Do not remove the actuator from the valve while the valve is still pressurized.
D Disconnect any operating lines providing air pressure, electric power, or a control signal to the actuator. Be sure the
actuator cannot suddenly open or close the valve.

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D Use bypass valves or completely shut off the process to isolate the valve from process pressure. Relieve process pressure
on both sides of the valve. Drain the process media from either side of the valve.
D Vent the power actuator loading pressure and relieve any actuator spring precompression.
D Use lock‐out procedures to be sure that the above measures stay in effect while you work on the equipment.
Replacing Packing
The A31A valve is designed so the packing can be replaced without removing the valve from the process pipeline.
Packing may be PTFE V‐rings or graphite.
If you are installing an ENVIRO‐SEAL™ Packing System in an existing valve, follow the instructions in the ENVIRO‐SEAL
Rotary Packing Instruction Manual (D101643X012). 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.
Figure 5. Properly Installed Wafer Style Valve
A5557
For valves with PTFE or graphite packing:
Key numbers for the parts in this section may be found in figure 7.
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. However, 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.

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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 diameter 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, using 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‐tightening. 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 continues, 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 diameter 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 pressure 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 packing 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 critical in making and maintaining a good seal. If the valve shaft surface is scratched,
nicked, dented, or worn, replace the valve shaft before replacing the packing system components.
4. Inspect the existing valve shaft. If necessary, replace the valve shaft as described in the procedures in this section.
5. Install the new packing system components as described in the ENVIRO‐SEAL Rotary Packing Instruction Manual
(D101643X012).
Removing the Valve from the Pipeline
1. Disconnect any operating lines providing air pressure, electric power, or a control signal to the actuator. Be sure the
actuator cannot suddenly open the valve. Vent the power actuator loading pressure.

Instruction Manual
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A31A Valve
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2. Use bypass valves or completely shut off the process to isolate the valve from process pressure. Relieve process
pressure on both sides of the valve. Drain the process media from either side of the valve.
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 loosening 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 replace the seal ring (key 5) while the actuator 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 position.
2. Lay the valve flat on a work bench in a secure position 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 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 Emerson sales office.

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A31A Valve
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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 outside 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 diameter 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 procedures. 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.
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 Emerson 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 outside 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 diameter 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 efficient 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.

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A31A Valve
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Figure 6. Typical Seal Installation
A5251‐1*
LARGEST OUTSIDE
DIAMETER (KEY 5)
WARNING
Avoid personal injury or property damage caused by the impact of a falling or tipping valve. Support large valves during
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, between 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 counterclockwise 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.
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 actuator torque.
Cryogenic Seal Installation
Unless otherwise indicated, key numbers and part names are listed in figure 8.

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A31A Valve
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A maintenance kit with installation tools is available through your Emerson 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 outside circumference. If an
aluminum backup ring is provided, 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 damage caused by the impact of a falling or tipping valve. Support large valves during
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, between 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 counterclockwise 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 actuator travel stop
or by the actuator. The internal travel stop in the valve body should not absorb any of the actuator torque.

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A31A Valve
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Figure 7. Anti‐Blowout Protection Detail
C0766 EXTERNAL DETAILS CUTAWAY, NPS 3 THROUGH 12
PACKING FLANGE
(KEY 11)
PACKING FLANGE
(KEY 11)
ANTI-BLOWOUT
FLANGE
(KEY 10) ANTI-BLOWOUT
FLANGE
(KEY 10)
ANTI-BLOWOUT
RING (KEY 16)
PACKING
FOLLOWER
(KEY 12)
TYPICAL
PACKING
(KEY 13)
VALVE BODY VALVE BODY
STUD (KEY 14)
AND HEX NUT
(KEY 15)
HEX JAM NUT
(KEY 17)
Anti‐Blowout Protection, Packing, Valve Shaft(s), Disk, and Bearing
Maintenance
Note
The NPS 10 through 12 CL150 valves and NPS 8 through 12 CL300 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 NPS 3 through 8 CL150 valves and NPS 3 through 6 CL300 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 result in personal injury. To avoid personal
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 internal parts.
If necessary, use a wheel puller to remove 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 internal 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 8.

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A31A Valve
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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 retaining 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 figure 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. Remove 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 follower.
4. Remove the anti‐blowout ring from around the drive shaft using a needle nose pliers.
Note
NPS 3 through 12 valves (CL150 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 packing box. The
bearing stop is pressed into the bearing bore. If the bearing stop needs replacement, contact your Emerson sales office 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 procedures, refer to the list below.
D CL150, NPS 3 through 8: One‐piece shaft with 1 taper key.
D CL150, NPS 10 and 12: Two‐piece shaft. 1 taper key in the drive shaft; 1 disk pin in the follower shaft.
D CL300, NPS 3 through 6: One‐piece shaft with 1 taper key.
D CL300, NPS 8 and 10: Two‐piece shaft. 1 taper key in the drive shaft; 1 disk pin in the follower shaft.
D CL300, NPS 12: 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 instructions.
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 remove the key, use a punch on the smaller end of the
taper key and drive it out of the disk and shaft, breaking the weld.

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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 extractor 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 increasing force will draw the pin
from the disk.
7. Valves with a two‐piece shaft have a gasket retainer 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 suitable punch or puller, drive or pull the journal bearing(s) into the
valve body bore from the drive shaft bearing 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 process control may result if bearings are improperly installed or are damaged during
installation.