Instruction Manual
Form 5291
March 2008
A31A Valve
Type A31A High Performance Butterfly Valve
(NPS 14 through 24)
Contents
Introduction 1...............................
Scope of Manual 1..........................
Description 1...............................
Specifications Table 2.......................
Installation 4................................
Valve Orientation 5.........................
Before Installing the Valve 5..................
Adjusting the Actuator Travel Stops or Travel 8.
Installing the Valve 8........................
Packing Adjustment and Shaft Bonding 9......
Maintenance 10.............................
Removing and Replacing the Actuator 10......
Packing Maintenance 10.....................
Removing the Valve 11......................
Seal Maintenance 11........................
PTFE Seals 11............................
NOVEX, Phoenix III and/or
Phoenix III Fire-Tested Seals 14..........
Anti-Blowout Design, Packing, Valve Shaft,
Disc, and Bearing Maintenance 15..........
Installing the Two-Piece Shaft 16............
Gasket Retainer 18.........................
Parts Ordering 18............................
Parts List 19................................
Introduction
Scope of Manual
This instruction manual includes installation,
maintenance, and parts ordering information for NPS
14 through 24, Type A31A High-Performance
Butterfly Valves (see figure 1). Refer to separate
instruction manuals for information covering the
actuator and accessories.
Do not install, operate, or maintain a Type A31A
High-Performance Butterfly Valve without first
D being fully trained and qualified in valve, actuator,
and accessory installation, operation, and
maintenance, and D carefully reading and
understanding the contents of this manual. If you
have any questions about these instructions, contact
W9134-1
Figure 1. Type A31A Valve with Bettisr Actuator and
DVC6020 Digital Valve Controller
your Emerson Process Managementt sales office
before proceeding.
Description
The valve is available in either a flangeless wafer
body or a single-flange (lugged) body design, with a
variety of seals and internal components. The
pressure-assisted seal provides tight shutoff against
the full class pressure range for the specific type.
The keyed shaft combines with a variety of
handlevers, handwheels, pneumatic piston or
spring-and-diaphragm actuators. Maximum inlet
pressure/temperature ratings are consistent with
CL150 and 300.
Note
Neither Emerson, Emerson Process
Management, nor any of their affiliated
entities assumes responsibility for the
selection, use and maintenance of any
product. Responsibility for the
selection, use, and maintenance of any
product remains with the purchaser
and end-user.
www.Fisher.com
D500194X012
A31A Valve
Instruction Manual
Form 5291
March 2008
Table 1. Specifications
Valve Size and End Connection Styles
NPS J 14, J 16, J 18, J 20, and J 24 valves,
Flow Coefficient Ratio
100 to 1
and in J wafer-style (flangeless) or
J single-flange (lugged) with raised-face flanges,
CL150 or 300
Noise Levels
See Catalog 12 for sound/pressure level
Maximum Pressure Drop
(1)
prediction
Consistent with CL150 and 300
pressure/temperature ratings per ASME B16.34
unless further restricted by values given in
figure 2
Shutoff Classification Per ANSI/FCI 70-2
and IEC 60534-4 or MSS SP-61
Standard Soft Seal: Bidirectional shutoff Class VI
(bubble-tight)
NOVEX Seal: Unidirectional shutoff MSS SP-61
(reverse flow direction only) Class VI optional
Phoenix III Seal: Bidirectional shutoff Class VI
Valve In-Line Position
Shaft horizontal. See figure 4
Valve/Actuator Action
With diaphragm or piston rotary actuator,
field-reversible between:
J push-down-to-close (extending actuator rod
closes valve) and
J push-down-to-open (extending actuator rod
opens valve)
(bubble-tight)
Phoenix III Seal for Fire-Tested Applications:
Unidirectional shutoff Class VI (reverse flow
direction only) (bubble-tight).
Fire Tested per API 607 Rev. 4
Available Seal Configurations
Standard Constructions
See figure 3 and table 2
Valve Body 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 and 300 raised-face flanges
Disc Rotation
Clockwise to close (when viewing from the drive
Standard Construction Materials
shaft end) through 90 degrees rotation
See table 2
Shaft Diameter and Approximate Weight
Material Temperature Capabilities
(1)
See tables 3 and 4
See table 2
ENVIRO-SEALr Packing
Flow Characteristic
Modified equal percentage
Flow Coefficients
See Catalog 12 and bulletin 21.1:A31A
1. The pressure/temperature limits in this manual, and any applicable code or standard limitation should not be exceeded.
2. Ratio of maximum flow coefficient to minimum usable flow coefficient may also be called rangeability.
This optional packing system provides improved
sealing, guiding, and transmission of loading force
to control liquid and gas emissions. Contact your
Emerson Process Management sales office for
availability of ENVIRO-SEAL packing
(2)
2
Instruction Manual
Form 5291
March 2008
A31A Valve
S21800
NOTE:
1
BECAUSE OF POTENTIAL EROSIVE EFFECTS AND
PREMATURE SEAL FAILURE THAT CAN OCCUR, THROTTLING
PTFE SEALS AT DIFFERENTIAL PRESSURES GREATER THAN
20.7 BAR (300 PSID) AT DISC ANGLES LESS THAN 20_ OPEN IS
NOT RECOMMENDED.
B23352/IL
Figure 2. Maximum Pressure/Temperature Ratings
2
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 2.
3
A31A Valve
Table 2. Material Temperature Ratings
COMPONENT AND MATERIAL OF CONSTRUCTION
Valve Body
Carbon Steel (WCC or SA 516-70)
CF8M (316 SST) CL150
CF8M FMS 20B16 (0.04% min. carbon) CL300
Disc
CF8M (316 SST) w/ or w/o Hard coating
CF8M with CoCr-A edge (Alloy 6)
Shaft
S20910
S17400 (17-4 PH 1025)
S17400 (17-4 PH H1150M)
Bearings
(2)
PEEK
(standard)
(3)
S31600
Packing
PTFE Packing and PTFE ENVIRO-SEAL Packing
Graphite packing
Graphite packing with oxidizing media
PTFE Seal Ring
Nitrile Backup O-Ring
Chloroprene Backup O-Ring
EPR Backup O-Ring
Fluorocarbon Backup O-Ring
PTFE Backup O-Ring
UHMWPE
Seal Ring and
Backup Ring
Seal Ring
1. NACE trim constructions are available; consult your Emerson Process Management sales office.
2. PEEK stands for poly-ether-ether-ketone.
3. For a complete material description, contact your Emerson Process Management sales office.
4. UHMWPE stands for ultra high molecular weight polyethylene.
5. Cast or wrought/plate grades used interchangeably, depending upon availabilityunless specified by customer.
Nitrile Backup O-Ring
Chloroprene Backup O-Ring
EPR Backup O-Ring
Fluorocarbon Backup O-Ring
PTFE Backup O-Ring
Phoenix III and/or FireTested Construction
S31600 and PTFE Seal Ring with Nitrile Backup O-Ring
Chloroprene Backup O-Ring
EPR Backup O-Ring
Fluorocarbon Backup O-Ring
NOVEX S31600 Seal
NOVEX S31600 Seal
NOVEX S21800 Seal Ring (CL300)
(5)
(4)
Seal Ring (CL150 Only)
(3)
Ring (CL150)
(3)
Ring (CL300)
(1)
Instruction Manual
TEMPERATURE RANGE
_C _F
29 to 427
198 to 538
198 to 816
198 to 538
198 to 816
198 to 538
73 to 454
196 to 454
73 to 260
198 to 816
54 to 232
198 to 916
198 to 538
29 to 93
43 to 149
54 to 182
29 to 204
73 to 204
29 to 93
43 to 93
54 to 93
29 to 93
73 to 93
40 to 149
54 to 149
62 to 204
40 to 232
46 to 538
46 to 816
46 to 816
Form 5291
March 2008
20 to 800
325 to 1000
325 to 1500
325 to 1000
325 to 1500
325 to 1000
100 to 850
320 to 850
100 to 500
325 to 1500
65 to 450
325 to 1500
325 to 1000
20 to 200
45 to 300
65 to 360
20 to 400
100 to 400
20 to 200
45 to 200
65 to 200
20 to 200
100 to 200
40 to 300
65 to 300
80 to 400
40 to 450
50 to 1000
50 to 1500
50 to 1500
Installation
The valve is normally shipped as part of a control
valve assembly, with the power actuator mounted on
the valve. If the valve or actuator have been
purchased separately, or if the actuator has been
removed for maintenance, mount the actuator on the
valve, and adjust actuator travel before installing the
valve into the line. This is necessary due to the
measurements that must be made during the
actuator calibration adjustment process. Refer to the
Actuator Mounting section of this manual and to the
separate actuator instruction manual for mounting
and adjusting instructions before proceeding.
4
WARNING
To avoid personal injury or property
damage resulting from the sudden
release of pressure:
D Always wear protective gloves,
clothing, and eyewear when
performing any maintenance
operations to avoid personal injury.
D Do not install the valve assembly
where service conditions could exceed
Instruction Manual
Form 5291
March 2008
A31A Valve
the limits given in this manual or on
the nameplates.
D Use pressure-relieving devices as
required by government or accepted
industry codes and good engineering
practices to protect from
over-pressurizing the system.
D Check with your process or safety
engineer for any additional measures
that must be taken to protect against
process media.
D If installing into an existing
application, also refer to the WARNING
at the beginning of the Maintenance
section in this instruction manual.
CAUTION
When ordered the valve configuration
and construction materials were
selected to meet particular pressure,
temperature, pressure drop, and
controlled fluid conditions.
Responsibility for the safety of
process media and compatibility of
valve materials rests solely with the
purchaser and end-user. Since some
body/trim material combinations are
limited in their pressure drop and
temperature range capabilities, do not
apply any other conditions to the valve
without first contacting your Emerson
Process Management sales office.
1. Isolate the control valve from the line pressure,
release pressure from both sides of the valve body,
and drain the process media from both sides of the
valve. If using a power actuator, shut off all pressure
lines to the power actuator, release pressure from
the actuator, and disconnect the pressure lines from
the actuator. Use lock-out procedures to be sure that
the above measures stay in effect while you are
working on the equipment.
WARNING
See the WARNING at the beginning of
the Maintenance section for more
information before removing the valve
from the pipeline.
2. Install a three-valve bypass around the control
valve assembly if continuous operation is necessary
during inspection and maintenance of the valve.
3. Inspect the valve to be certain that it is free of
foreign material.
CAUTION
Damage to the disc will occur if any
pipe flanges or piping connected to
the valve interfere with the disc
rotation path. If piping flange has a
smaller inner diameter than specified
for schedule 80 piping, measure
carefully to be certain the disc rotates
without interference before placing
the valve into operation. Minimum
inside diameters for flanges or pipe
mating with valves are shown in tables
3 and 4.
Be certain that adjacent pipelines are
free of any foreign material, such as
pipe scale or welding slag, that could
damage the valve sealing surfaces.
Valve Orientation
The valve can be installed in any orientation,
however, it is recommended that the valve drive
shaft be horizontal and the actuator vertical as
shown in figure 5.
Install the valve with the high-pressure shutoff side
in the direction noted by the flow arrow for proper
installation, and see figure 4 for more information.
Before Installing the Valve
WARNING
The edges of a rotating valve disc
(key 2, figure 9) close with a shearing,
cutting motion. To avoid personal
injury, keep hands, tools, and other
objects away from the disc while
stroking the valve.
If the Type A31A valve is equipped
with a fail-open actuator, cycle the
valve into the fully closed position.
Ensure the valve cannot open during
installation by using travel stops, a
manual actuator, a constant supply
pressure to the pneumatic actuator, or
other steps as necessary.
5
A31A Valve
Table 3. Valve Body Data, CL150
VALVE SIZE,
NPS
14 30.2 92.1 331.2 71.7 94.8
16 31.75 101.6 375.2 93.9 137.9
18 38.1 114.3 418.8 139.3 178.3
20 44.45 127.0 464.1 166.9 223.6
24 57.15 154.0 580.9 255.4 350.6
14 1-3/16 3-5/8 13.04 158 209
16 1-1/4 4 14.77 207 304
18 1-1/2 4-1/2 16.49 307 393
20 1-3/4 5 18.27 368 493
24 2-1/4 6-1/16 22.87 563 773
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 disc swing clearance.
SHAFT DIA. AT
YOKE BEARING
FACE-TO-FACE
DIMENSION
mm kg
Inches Pounds
Instruction Manual
Form 5291
March 2008
(1)
MINIMUM
.(2)
I.D
APPROXIMATE WEIGHT
Wafer
SingleFlange
B23341/IL
6
Figure 3. Available Seal Configurations
Instruction Manual
Form 5291
March 2008
Table 4. Valve Body Data, Wafer-Style Valves, CL300
SHAFT DIA. AT
VALVE SIZE, NPS
14 44.45 117.5 304.3 125.2 231.3
16 44.45 133.4 346.2 189.2 300.7
18 57.15 149.2 389.4 237.7 411.4
20 69.9 155.6 442.0 370.6 551.1
24 69.9 181.0 523.2 477.2 828.7
14 1-3/4 4-5/8 11.98 276 510
16 1-3/4 5-1/4 13.63 417 663
18 2-1/4 5-7/8 15.32 524 907
20 2-3/4 6-1/8 17.40 817 1215
24 2-3/4 7-1/8 20.59 1052 1827
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 disc swing clearance.
YOKE BEARING
FACE-TO-FACE
DIMENSION
mm kg
Inches Pounds
A31A Valve
(1)
MINIMUM
.(2)
I.D
APPROXIMATE WEIGHT
Wafer Single-Flange
Table 5. Hex Head Screw, Stud Bolt and Cap Screw Data
VALVE
SIZE, NPS
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 11/2-8 3-1/2 4-1/2 - - - - - -
14 - - - 8 12 16 1-8 1-1/8-8 - - - 3-1/2 9-1/2 12
16 - - - 8 16 16 1-8 1-1/8-8 - - - 3-3/4 10 13-1/2
18 - - - 8 16 16 1-1/8-8 1-1/4-8 - - - 4 11 13-3/4
20 - - - 8 20 20 1-1/8-8 1-1/4-8 - - - 4 12 14-1/2
24 - - - 8 20 20 1-1/4-8 1-1/2-8 - - - 4-1/2 14 16-1/2
1. Thread engagement in accordance with ASME B31.3 “Process Piping”.
2. Bolting lengths are based on installation of valve between standard raised face flanges and utilizing flange gaskets with a final compression thickness of 1/8 inch. When gaskets used
have a final compression thickness of less than 1/8 inch, reduce bolting lengths shown by 1/4 inch.
NUMBER OF CAP
SCREWS
CL150 CL300 CL150 CL300 CL150 CL300 CL150 CL300 CL150 CL300
CAUTION
NUMBER OF STUD
BOLTS
SIZE-DIAMETER INCH
AND THREAD
Single-Flange Style
Wafer-Style
such as a valve positioner. If the valve and actuator
have been purchased separately or if the actuator
(2)
(1)
LENGTH OF CAP
SCREWS, INCH
LENGTH OF STUD
BOLTS, INCH
has been removed for maintenance, properly mount
When using an actuator, the actuator
travel stop (or actuator travel, for
the actuator and adjust valve/actuator travel and all
travel stops before inserting the valve into the line.
actuators without adjustable stops)
must be adjusted so the disc stop in
the valve does not absorb the output
of the actuator. Failure to limit the
CAUTION
actuator travel as described in the
Adjusting the Actuator Travel Stops or
Travel steps can result in damage to
the valve, shaft(s), or other valve
components.
Damage to the disc will occur if any
pipe flanges or piping connected to
the valve interfere with the disc
rotation path. Be certain to align the
valve accurately to avoid contact
A Type A31A valve is normally shipped as part of an
assembly with an actuator and other accessories
between the disc (key 2) and the
flanges.
7
A31A Valve
B2263-1/IL
Figure 4. Proper Installation Steps
Instruction Manual
Form 5291
March 2008
position of the valve disc (key 2). When adjusting the
travel stop or travel, make sure that the disc is from
0 to 0.76 mm (0 to 0.030 inch) away from the
internal stop in the valve body (see figure 8). 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.
CAUTION
When using an actuator, the actuator
travel stop (or actuator travel, for
actuators without adjustable stops)
must be adjusted so the disc stop in
the valve does not absorb the output
of the actuator. Failure to limit the
actuator travel as described in the
Adjusting the Actuator Travel Stops or
Travel steps can result in damage to
the valve, shaft(s), or other valve
components.
2. Before installing the valve/actuator assembly in
the process line, cycle the valve several times to be
sure the valve disc returns to the proper position.
A5557/IL
Figure 5. Properly Installed Wafer-Style Valve
Adjusting the Actuator Travel Stops or
Travel
Key number locations are shown in figure 9, unless
otherwise noted.
1. Refer to the actuator instruction manual to locate
the actuator travel stop that control the closed
Installing the Valve
The maximum allowable inlet pressures for Type
A31A valves are consistent with the applicable
ASME pressure/temperature ratings except where
limited by the material capabilities as shown in
table 2 or figure 3.
Refer to table 5 for the quantity and size of line
bolting required to install the valve in the pipeline.
CAUTION
To avoid damage to the valve disc
during installation, the valve must be
in the fully closed position. If the Type
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 be sure that the
actuator does not cause the valve to
open during installation.
1. See figure 5 for recommended valve orientation.
D For Wafer-Style Valves: Install the lower
flange bolts first to form a cradle for the valve (see
figure 4). See table 5 for flange bolt specifications.
8
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