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

Instruction Manual
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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.