Emerson Fisher POSI-SEAL A31A User manual

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Fisher™POSI‐SEAL™A31A Cryogenic High
Performance Butterfly Valve
Contents
Introduction 1.................................
Scope of Manual 1.............................
Specifications 2...............................
Description 2.................................
Installation 2..................................
Adjusting the Actuator Travel Stops or Travel 4.....
Valve Orientation 4............................
Preparing for Installation 4......................
Installing Wafer‐Style Valves 6...................
Installing Single‐Flange Valves 8.................
Maintenance 8.................................
Replacing Packing 9...........................
Removing the Valve from the Pipeline 10..........
Removing/Installing the Seal Ring 11.............
NOVEXtSeal Installation 12................
Kel‐F and Kel‐F/aluminum Seal Installation 13..
Anti‐Blowout Protection, Packing,
Valve Shaft(s), Disk, and Bearing
Maintenance 15...........................
Disassembly 16............................
Installing a One‐Piece Shaft 18...............
Installing a Two‐Piece Shaft 19...............
Installing the Gasket Retainer 21.............
Parts Ordering 22...............................
Parts List 22...................................
Figure 1. Fisher A31A Cryogenic Valve with
1035 Actuator
W7451 / IL
Introduction
Scope of Manual
This instruction manual provides installation, maintenance, and parts ordering information for the POSI‐SEAL A31A
Cryogenic high‐performance butterfly valves (see figure 1). The Series C (3‐ through 6‐inch Class 150 & 300 and 8‐inch
Class 150) feature a cast one‐piece extension. The 8‐inch Class 300, and 10‐ through 24‐inch Class 150 & 300 designs
have a two‐piece extension. For information regarding actuators and accessories, refer to separate instruction
manuals.
Do not install, operate, or maintain an A31A Cryogenic valve 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 of the contents of this manual, includingall safety cautions and
warnings. If you have any questions about these instructions, contact your Emerson sales office.
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Table 1. Specifications
Available Valve Configurations
JFlangeless, wafer‐style or Jsingle‐flange (lugged)
control valve with a one‐piece extension housing and
either NOVEX seal (standard), Kel‐F seal (optional) or
Kel‐F seal with Aluminum backup V‐ring (optional)
Valve Sizes
J3, J4, J6, J8, J10, J12, J14, J16, J18,
J20, or J24‐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(1)
Consistent with ANSI Class J150 and J300
pressure/temperature ratings per ASME B16.34,
except that 38_C (100_F) rating is applicable to
‐254_C (‐425_F). NOVEX seal maximum
pressure/temperature rating is the same as the valve
body. See figure 2 for rating of Kel‐F seal.
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
Materials of Construction
See Bulletin 21.1:Cryogenic‐Rotary
Installed Valve Orientation
See figure 3 for orientation guidelines
Available Actuators
J1035, JBettis Pneumatic or J1051/1052
Disk Rotation
Clockwise to close
1. The pressure/temperature limits in this manual, and any applicable code or standard limitation, should not be exceeded.
Description
The A31A Cryogenic Series C (3‐ through 6‐inch Class 150 & 300 and 8‐inch Class 150) High Performance Butterfly
Valve features either a double D drive shaft to allow direct coupling to the 1035 actuator or keyed shaft (optional). The
A31A Cryogenic is a reliable, high‐performance butterfly valve for cryogenic applications.
The A31A Cryogenic is available in either a flangeless (wafer) or a single‐flange (lugged) valve body style and a variety
of seals.
The standard seal for the A31A Cryogenic valve is the NOVEXtmetal seal which provides tight shutoff, low operating
torques and the ruggedness required for cryogenic service. Kel‐f and Kel‐f/aluminum seals are also available.
Installation
WARNING
Always wear protective gloves, clothing and eyewear when performing any installation operations to avoid 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.

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CAUTION
Responsibility for the safety of process media and compatibility of valve materials rests solely with the purchaser and
end‐user. When ordered, the valve configuration and construction materials were selected to meet particular pressure,
pressure drop, temperature, and controlled fluid conditions. Because pressure drop and temperature range capabilities
limit some combinations of materials, do not apply any other conditions to the valves without first contacting your
Emerson sales office.
Before installation check the maximum allowable inlet pressures for A31A Cryogenic valves shown in figure 2 and the
Specifications table.
Figure 2. Maximum Pressure/Temperature Ratings
CLASS 150, KEL‐F SEAL CLASS 300, KEL‐F SEAL
C0759‐1 / IL
KEL‐F
A4132‐1 / IL A3715‐2 / IL

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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.
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 shaft 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 0.03 to 0.76 mm (0.001 to 0.030 inch) 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.
Valve Orientation
Note
When the process flow is gas, install the valve with the shaft in the horizontal position.
When the process flow is liquid the valve should be installed at an incline above horizontal of at least 20 degrees, as shown in
figure 3. Inclined installation can enhance valve performance by preventing direct cryogenic liquid contact with the packing.
The A31A Cryogenic 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 cryogenic service, follow the
recommendations below, which are based on application experience:
D Installing the valve with the extension housing or bonnet four to six inches beyond the cold box (see figure 3)
provides space for slight boil‐off of cryogenic liquids.
D When installed with the extension stem inclined 20 degrees above horizontal, the vapor pocket resulting from
cryogenic liquid boil‐off prevents the colder liquid from contacting the stem packing area.
D Recommended installation for optimum seal performance of the NOVEX and Kel‐F seals is reverse flow (into the
back of the disk).
D A flow tag with an arrow is provided for proper installation.
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 Cryogenic
valve is equipped with a fail‐open actuator, remove the actuator before installing the valve/actuator assembly or cycle the

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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 Cryogenic valve is normally shipped as part of an assembly with an actuator and other accessories. 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 Cryogenic valve is designed for use with the appropriate piping schedule for the specified ANSI class. Minimum
inside diameters for flanges or pipe mating with valves are shown in tables 2 and 3. 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.
Additionally, be certain that the valve body and any adjacent pipelines are free of foreign material, such as pipe scale or
welding slag that could damage the valve seating surfaces.
Table 2. Valve Body Data, Class 150
VALVE SIZE, INCHES
SHAFT DIAMETER AT
YOKE BEARING
FACE‐TO‐FACE DIMEN‐
SION(1)
MINIMUM
I.D.(2)
APPROXIMATE WEIGHT
Wafer Single Flange
mm Kilograms
3 16 47.6 71.4 12 16
4 19 54.0 93.7 21 22
6 25 57.2 147.6 24 28
8 25 63.5 196.9 34 40
10 32 71.4 254.0 57 67
12 38 81.0 298.5 74 93
14 30 92 330 87 120
16 32 102 378 133 182
18 38 114 429 170 231
20 44 127 470 210 302
24 57 154 575 326 455
Inches Pounds
3 5/8 1‐7/8 2.81 27 36
4 3/4 2‐1/8 3.69 46 48
6 1 2‐1/4 5.81 53 61
8 1 2‐1/2 7.75 75 89
10 1‐1/4 2‐13/16 10.00 125 148
12 1‐1/2 3‐3/16 11.75 164 206
14 1‐3/16 3‐5/8 13 191 265
16 1‐1/4 4 14‐7/8 294 401
18 1‐1/2 4‐1/2 16‐7/8 374 510
20 1‐3/4 5 18‐1/2 463 665
24 2‐1/4 6‐1/16 22‐5/8 719 1004
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.

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Table 3. Valve Body Data, Class 300
VALVE SIZE, INCHES
SHAFT DIAMETER AT
YOKE BEARING
FACE‐TO‐FACE DIMEN‐
SION(1)
MINIMUM
I.D.(2)
APPROXIMATE WEIGHT
Wafer Single Flange
mm Kilograms
3 16 47.6 71.4 12 16
4 19 54.0 93.7 21 24
6 25 57.2 146.1 24 28
8 32 73.0 186.2 47 52
10 38 85.3 230.1 80 100
12 44 94.1 281.7 103 135
14 44 117 305 142 249
16 44 133 349 213 325
18 57 149 391 259 434
20 70 159 442 401 582
24 70 181 523 512 863
Inches Pounds
3 5/8 1‐7/8 2.82 27 35
4 3/4 2‐1/8 3.69 46 52
6 1 2‐1/4 5.75 53 61
8 1‐1/4 2‐7/8 7.32 104 115
10 1‐1/2 3‐23/64 9.06 176 220
12 1‐3/4 3‐45/64 11.09 227 298
14 1‐3/4 4‐5/8 12 314 548
16 1‐3/4 5‐1/4 13‐3/4 470 716
18 2‐1/4 5‐7/8 15‐3/8 570 956
20 2‐3/4 6‐1/4 17‐13/32 884 1282
24 2‐3/4 7‐1/8 20‐19/32 1128 1903
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.
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 4 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 personal injury. To avoid personal injury, keep
clear of the disk edges when rotating the disk.
1. See figure 3 for recommended valve orientation. See table 4 for flange bolt specifications. Install the lower flange
bolts first to form a cradle for the valve.

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Table 4. Hex Head Screw, Stud Bolt and Cap Screw Data(1)
VALVE SIZE, INCH NUMBER SIZE DIA. INCH & THREAD LENGTH, INCH
Class 150 Class 300 Class 150 Class 300 Class 150 Class 300
Wafer 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
14 12 16 1-8 1‐1/8-8 9‐1/2 12
16 16 16 1-8 1‐1/4-8 10 13‐1/2
18 16 20 1‐1/8-8 1‐1/4-8 11 13‐3/4
20 20 20 1‐1/8-8 1‐1/4-8 12 14‐1/2
24 20 20 1‐1/4-8 1‐1/2-8 14 16‐1/2
Wafer Style with Cap Screws
14 ‐ ‐ ‐ 8‐ ‐ ‐ 1‐1/8-8 ‐ ‐ ‐ 3‐1/2
16 ‐ ‐ ‐ 8‐ ‐ ‐ 1‐1/4-8 ‐ ‐ ‐ 3‐3/4
18 ‐ ‐ ‐ 8‐ ‐ ‐ 1‐1/4-8 ‐ ‐ ‐ 4
20 ‐ ‐ ‐ 8‐ ‐ ‐ 1‐1/4-8 ‐ ‐ ‐ 4
24 ‐ ‐ ‐ 8‐ ‐ ‐ 1‐1/2-8 ‐ ‐ ‐ 4‐1/2
Single Flange 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
14 24 40 1-8 1‐1/8‐8 2‐3/4 3‐1/2
16 32 40 1-8 1‐1/4-8 3 3‐3/4
18 32 48 1‐1/8‐8 1‐1/4-8 3‐1/4 4
20 40 48 1‐1/8‐8 1‐1/4-8 3‐1/2 4
24 40 48 1‐1/4-8 1‐1/2-8 3‐1/2 4‐1/2
1. Thread engagement in accordance with ANSI B31.3 “Chemical Plant and Petroleum Refinery Piping”.
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 (reverse flow). 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 valve 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.
Note
The optional graphite ribbon packing and metal bearings are composed of all conductive material to electrically bond the shaft to
the valve for hazardous area service, as opposed to the non‐conductive PTFE packing and bearings.

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5. 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 3 for recommended valve orientation. See table 4 for hex head cap screw specifications.
2. Properly orient the valve according to the specific application. For optimum shutoff, 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 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.
Note
The optional graphite ribbon packing and metal bearings are composed of all conductive material to electrically bond the shaft to
the valve for hazardous area service, as opposed to the non‐conductive PTFE packing and bearings.
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 severity of service conditions.
WARNING
Avoid personal injury from sudden release of process pressure. Before performing any maintenance operations:
D Always wear protective gloves, clothing and eyewear when performing any maintenance operations to avoid personal
injury.
D Disconnect any operating lines providing air pressure, electric power, or a control signal to the actuator. Be sure the
actuator cannot suddenly open or close the valve.
D Use bypass valves or completely shut off the process to isolate the valve from process pressure. Relieve process pressure
on both sides of the valve. Drain the process media from 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.
D The valve packing box may contain process fluids that are pressurized even when the valve has been removed from the
pipeline. Process fluids may spray out under pressure when removing the packing hardware or packing rings, or when
loosening the packing box pipe plug.

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D Check with your process or safety engineer for any additional measures that must be taken to protect against process
media.
Figure 3. Properly Installed Cryogenic Valve
16B5084 / DOC
COLD BOX
TRANSITION
4” ‐ 8” MIN
20_MIN
Replacing Packing
The A31A Cryogenic valve is designed so the packing can be replaced without removing the valve from the process
pipeline, provided there is no internal pressure. Packing may be PTFE V‐rings or graphite.
Key numbers for the parts in this section may be found in figures 7 and 8.
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 than expected.
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.
2. Then, remove the hex nuts (key 18) and lift off the packing follower (key 11). The packing (key 13) is now
accessible. Refer to figure 6 for details of the blowout protection.
3. Use a packing extractor to remove the 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.
Note
For valves equipped with non‐metallic (PTFE composition) bearings, perform the following step to inspect and/or replace the
outboard bearing (key 10).
4. Using a formed hook or probe, carefully remove the packing ring (key 12) and inspect the outboard bearing (key
10) for excessive intrusion or wear. Outboard bearings are only found on the 3‐ through 12‐inch sizes. If necessary,
remove the bearing carefully using needle‐nose pliers and install a new bearing and existing packing ring using the
packing follower (key 11) as a driver.
CAUTION
Be careful when cleaning the packing box. Scratches to the shaft or inside diameter of packing bore might cause leakage.
5. Before installing new packing, clean the packing box.
6. Install new packing (key 13) one ring at a time, using the packing follower (key 11) as a driver. If using split‐ring
packing, stagger the splits in the rings to avoid creating a leak path.
7. Reinstall all parts. Tighten the packing follower nuts (key 18) as needed to stop leakage under operating conditions.
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.
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.