Emerson Fisher 8532 User manual

www.Fisher.com
D101550X012
Type 8532 High Performance Butterfly Valve
Contents
Introduction 1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Scope of Manual 1. . . . . . . . . . . . . . . . . . . . . . . . .
Description 1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Specifications 2. . . . . . . . . . . . . . . . . . . . . . . . . . . .
Installation 4. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Valve Orientation 5. . . . . . . . . . . . . . . . . . . . . . . . .
Before Installing the Valve 5. . . . . . . . . . . . . . . . .
Adjusting the Actuator Travel Stops
or Travel 7. . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Installing the Valve 7. . . . . . . . . . . . . . . . . . . . . . . .
Packing Adjustment and Shaft Bonding 8. . . .
Maintenance 10. . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Removing and Replacing the Actuator 10. . . . . .
Packing Maintenance 10. . . . . . . . . . . . . . . . . . . .
Removing the Valve 12. . . . . . . . . . . . . . . . . . . . .
Seal Maintenance 12. . . . . . . . . . . . . . . . . . . . . . .
PTFE Seals 13. . . . . . . . . . . . . . . . . . . . . . . . . . . .
NOVEX, Phoenix III and/or
Phoenix III Fire-Tested Seals 14. . . . . . . . . .
Anti-Blowout Design, Packing, Valve Shaft,
Disc, and Bearing Maintenance 14. . . . . . . . .
Installing the Two-Piece Shaft 16. . . . . . . . . . . .
Gasket Retainer 17. . . . . . . . . . . . . . . . . . . . . . . . .
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 8532 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 8532
valve without first Dbeing fully trained and qualified
in valve, actuator, and accessory installation,
operation, and maintenance, and Dcarefully reading
and understanding the contents of this manual. If
you have any questions about these instructions,
contact your Emerson Process Managementtsales
office before proceeding.
Figure 1. Type 8532 Valve with Type 1061 Actuator and
DVC6020 Digital Valve Controller
W9138-1
Unless otherwise noted, all NACE references are to
NACE MR0175-2002.
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.
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. The
upper (splined) shaft combines with a variety of
pneumatic piston or spring-and-diaphragm
actuators. Maximum inlet pressure/temperature
ratings are consistent with CL150 and CL300.
Instruction Manual
Form 5288
November 2007 8532 Valve

8532 Valve
Instruction Manual
Form 5288
November 2007
2
Table 1. Specifications
Valve Size and End Connection Styles
JNPS 14, J16, J18, J20, or J24 valves, in
Jwafer-style (flangeless) or Jsingle-flange
(lugged) with raised-face flanges, CL150 or
CL300
Maximum Pressure Drop(1)
Consistent with CL150 and CL300
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
Standard Soft Seal: Bidirectional shutoff Class VI
(bubble-tight)
NOVEX Seal: Unidirectional shutoff Class V
(reverse flow direction only)
Phoenix III Seal: Bidirectional shutoff Class VI
(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. For cryogenic seal applications,
consult your Emerson Process Management
sales office
Available Seal Configurations
Standard Constructions
See figure 3 and table 2
Standard Construction Materials
See table 2
Flow Characteristic
Modified equal percentage
Flow Coefficients
See Catalog 12 and bulletin 51.6:8532
Flow Coefficient Ratio(2)
100 to 1
Noise Levels
See Catalog 12 for sound/pressure level
prediction
Valve In-Line Position
Shaft horizontal. See figure 4
Valve/Actuator Action
With diaphragm or piston rotary actuator,
field-reversible between:
Jpush-down-to-close (extending actuator rod
closes valve) and
Jpush-down-to-open (extending actuator rod
opens valve)
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 CL300 raised-face flanges
Disc Rotation
Clockwise to close (when viewing from the drive
shaft end) through 90 degrees rotation
Shaft Diameter and Approximate Weight
See tables 3 and 4
ENVIRO-SEALrPacking
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
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.

8532 Valve
Instruction Manual
Form 5288
November 2007
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Figure 2. Maximum Pressure/Temperature Ratings
B2335–2/IL
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.
NOTE:
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.
2
1
S21800

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Instruction Manual
Form 5288
November 2007
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Table 2. Material Temperature Ratings
COMPONENT AND MATERIAL OF CONSTRUCTION(1)
TEMPERATURE RANGE
COMPONENT AND MATERIAL OF CONSTRUCTION
(1)
_C_F
Body
Carbon Steel (WCC or SA 516–70)(5)
CF8M (316 SST) CL150
CF8M FMS 20B16 (0.04% min carbon) CL300
–29 to 427
–198 to 538
–198 to 816
–20 to 800
–325 to 1000
–325 to 1500
Disc
CF8M (316 SST) w/ or w/o Hard coating
CF8M with CoCr-A edge (Alloy 6)
–198 to 538
–198 to 538
–325 to 1000
–325 to 1000
Shaft
S20910
S17400 (17-4 PH 1025)
S17400 (17-4 PH H1150M)
–198 to 538
–73 to 454
–196 to 454
–325 to 1000
–100 to 850
–320 to 850
Bearings
PEEK(2) (standard)
S31600(3)
–73 to 260
–198 to 816
–100 to 500
–325 to 1500
Packing
PTFE Packing and PTFE ENVIRO-SEAL Packing
Graphite packing
Graphite packing with oxidizing media
–54 to 232
–198 to 916
–198 to 538
–65 to 450
–325 to 1500
–325 to 1000
PTFE Seal Ring
NBR (Nitrile) Backup O-Ring
CR (chloroprene) Backup O-Ring
EPR Backup O-Ring
Fluorocarbon Backup O-Ring
PTFE Backup O-Ring
–29 to 93
–43 to 149
–54 to 182
–29 to 204
–73 to 204
–20 to 200
–45 to 300
–65 to 360
–20 to 400
–100 to 400
Seal Ring and
Backup Ring
UHMWPE(4) Seal Ring (CL150 Only)
NBR Backup O-Ring
CR Backup O-Ring
EPR Backup O-Ring
Fluorocarbon Backup O-Ring
PTFE Backup O-Ring
–29 to 93
–43 to 93
–54 to 93
–29 to 93
–73 to 93
–20 to 200
–45 to 200
–65 to 200
–20 to 200
–100 to 200
Phoenix III and/or Fire Tested Construction
S31600 and PTFE Seal Ring with NBR Backup O-Ring
CR Backup O-Ring
EPR Backup O-Ring
Fluorocarbon Backup O-Ring
–40 to 149
–54 to 149
–62 to 204
–40 to 232
–40 to 300
–65 to 300
–80 to 400
–40 to 450
Seal Ring
NOVEX S31600 Seal(3) Ring (CL150)
NOVEX S31600 Seal(3) Ring (CL300)
NOVEX S21800 Seal Ring (CL300)
–29 to 538
–29 to 816
–29 to 816
–20 to 1000
–20 to 1500
–20 to 1500
Cryogenic Seal Ring Contact your Emerson Process Management sales office
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 availability – unless specified by customer.
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 has 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.
WARNING
To avoid personal injury or property
damage resulting from the sudden
release of pressure:
DAlways wear protective gloves,
clothing, and eyewear when
performing any maintenance
operation.
DDo not install the valve assembly
where service conditions could exceed
the limits given in this manual or on
the nameplates.

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Instruction Manual
Form 5288
November 2007
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DUse pressure-relieving devices as
required by government or accepted
industry codes and good engineering
practices to protect from
over-pressurizing the system.
DCheck with your process or safety
engineer for any other hazards that
may be present from exposure to
process media.
DIf 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 with process media
rests solely with the purchaser and
end-user. Since some body/trim
material combinations are limited in
their pressure drop and temperature
ranges, 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.
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.
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.
CAUTION
Damage to the disc will occur if any
pipe flanges or piping connected to
the valve interfere with the disc
rotation path. If the 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.
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 4.
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 8532 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.

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Instruction Manual
Form 5288
November 2007
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Table 3. Valve Body Data, CL150
VALVE SIZE, NPS
SHAFT DIA. AT YOKE
BEARING
FACE-TO-FACE
DIMENSION(1) MINIMUM I.D.(2) APPROXIMATE WEIGHT, KILOGRAMS
VALVE
SIZE
,
NPS
mm Wafer Single-Flange
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
VALVE SIZE, NPS
SHAFT DIA. AT YOKE
BEARING
FACE-TO-FACE
DIMENSION(1) MINIMUM I.D.(2) APPROXIMATE WEIGHT, POUNDS
VALVE
SIZE
,
NPS
Inches Wafer Single-Flange
14 1-3/16 3.625 13.04 158 209
16 1-1/4 4 14.77 207 304
18 1/2 4.5 16.49 307 393
20 1-3/4 5 18.27 368 493
24 2-1/4 6.0625 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.
Table 4. Valve Body Data, Wafer-Style Valves, CL300
VALVE SIZE, NPS
SHAFT DIA. AT YOKE
BEARING
FACE-TO-FACE
DIMENSION(1) MINIMUM I.D.(2) APPROXIMATE WEIGHT, KILOGRAMS
VALVE
SIZE
,
NPS
mm Wafer Single-Flange
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
VALVE SIZE, NPS
SHAFT DIA. AT YOKE
BEARING
FACE-TO-FACE
DIMENSION(1) MINIMUM I.D.(2) APPROXIMATE WEIGHT, POUNDS
VALVE
SIZE
,
NPS
Inches Wafer Single-Flange
14 1-3/4 4.625 11.98 276 510
16 1-3/4 5.25 13.63 417 663
18 2-1/4 5.875 15.32 524 907
20 2-3/4 6.125 17.40 817 1215
24 2-3/4 7.125 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.
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.
A Type 8532 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.
CAUTION
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
between the disc (key 2) and the
flanges.

8532 Valve
Instruction Manual
Form 5288
November 2007
7
Figure 3. Available Seal Configurations
B2313–3/IL
GRAPHITE
GASKET
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 controls the closed
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 5). 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 disc returns to the proper position.
Installing the Valve
The maximum allowable inlet pressures for Type
8532 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
8532 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.

8532 Valve
Instruction Manual
Form 5288
November 2007
8
Table 5. Hex Head Screw, Stud Bolt and Cap Screw Data(1)
VALVE
SIZE NPS
NO. OF CAP SCREWS NO. OF STUD BOLTS SIZE-DIA. INCH & THREAD LENGTH OF CAP
SCREWS, INCH
LENGTH OF STUD BOLTS,
INCH
SIZE, NPS CL150 CL300 CL150 CL300 CL150 CL300 CL150 CL300 CL150 CL300
Single-Flange Style(2)
14 24 40 - - - - - - 1-8 1-1/8-8 2.75 3.5 - - - - - -
16 32 40 - - - - - - 1-8 1-1/4-8 3 3.75 - - - - - -
18 32 48 - - - - - - 1-1/8-8 1-1/4-8 3.25 4 - - - - - -
20 40 48 - - - - - - 1-1/8-8 1-1/4-8 3.5 4 - - - - - -
24 40 48 - - - - - - 1-1/4-8 1–1/2-8 3.5 4.5 - - - - - -
Wafer-Style
14 - - - 8 12 16 1-8 1-1/8-8 - - - 3.5 9.5 12
16 - - - 8 16 16 1-8 1-1/8-8 - - - 3.75 10 13.5
18 - - - 8 16 16 1-1/8-8 1-1/4-8 - - - 4 11 13.75
20 - - - 8 20 20 1-1/8-8 1-1/4-8 - - - 4 12 14.5
24 - - - 8 20 20 1-1/4-8 1-1/2-8 - - - 4.5 14 16.5
1. Thread engagement in accordance with ASME B31.3 “Chemical Plant and Petroleum Refinery 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 0.125 inch. When gaskets
used have a final compression thickness of less than 0.125 inch, reduce bolting lengths shown by 0.25 inch.
Figure 4. Installation of Wafer-Style Valves
A5557/IL
1. See figure 4 for recommended valve orientation.
DFor Wafer-Style Valves: Install the lower
flange bolts first to form a cradle for the valve (see
figure 5). See table 5 for flange bolt specifications.
DFor Single-Flange Valves: Position the valve
between the flanges. Be sure to leave enough room
for the flange gaskets. Install the lower flange bolts.
2. For all Valves: Select the appropriate gaskets for
the application. Flat sheet, spiral wound, or other
gasket types, made to the ASME B16.5 standard or
user’s standard, can be used on Type 8532 valves
depending on the service conditions of the
application.
3. For Wafer-Style Valves: Properly orient the
valve according to the specific application. Place the
valve in the line so the flow properly enters the valve
as indicated by the flow tag. Then, install the valve
and the gaskets between the flanges into the cradle
formed by the flange bolts.
4. Install the remaining flange bolts.
DFor Wafer-Style Valves: Make sure the
gaskets are centered on the gasket sealing surfaces
of the flange and body.
5. For all Valves: 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.
After applying the final torque value, tighten each
flange bolt again to allow for gasket compression.
Packing Adjustment and Shaft Bonding
WARNING
Personal injury could result from
packing leakage. Valve packing was
tightened before shipment; however,
the packing might require some
readjustment to meet specific service
conditions. Check with your process
or safety engineer for any other
hazards that may be present from
exposure to process media.

8532 Valve
Instruction Manual
Form 5288
November 2007
9
Figure 5. Proper Installation Steps
B2263-1/IL
CAUTION
For non-ENVIRO-SEAL packing:
Tighten the packing follower nuts only
enough to prevent shaft leakage.
Excessive tightening will accelerate
wear of the packing and could produce
higher friction loads on the valve stem.
1. For PTFE or graphite packing: Tighten
standard packing follower nuts only enough to
prevent shaft leakage. Excessive tightening of
packing will accelerate wear and could produce
higher rotating friction loads on the valve stem. If
necessary, refer to the Packing Maintenance
section.
2. The ENVIRO-SEAL Packing Systems will not
require this initial re-adjustment. Refer to the
separate instruction manual ENVIRO-SEAL Packing
System for Rotary Valves, Form 5305, for repair and
adjustment procedures.
3. 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.
Figure 6. Optional Shaft-to-Valve Body
Bonding Strap Assembly
VALVE BODY ACTUATOR
A
AVIEW A-A
37A6528-A
A3143-2/IL
WARNING
The valve shaft is not necessarily
grounded when installed in a pipeline
unless the shaft is electrically bonded
to the valve.
To avoid personal injury or property
damage resulting from the effects of a
static electricity discharge from valve
components in a hazardous
atmosphere or where the process fluid
is combustible, electrically bond the
drive shaft (key 3) to the valve
according to the following step.
Note
Standard PTFE packing is composed
of a partially conductive carbon-filled
PTFE female adaptor with PTFE V-ring
packing. Standard graphite packing is
composed of all conductive graphite
ribbon packing. Alternate
shaft-to-valve body bonding is
available for hazardous service areas
where the standard packing is not
sufficient to bond the shaft to the
valve (see the following step).
For oxygen service applications,
provide alternate shaft-to-valve body
bonding according to the following
step.

8532 Valve
Instruction Manual
Form 5288
November 2007
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4. Attach the bonding strap assembly (key 131,
figure 6) to the shaft with the clamp (key 130,
figure 6).
5. Connect the other end of the bonding strap
assembly to the valve flange cap screws.
6. For more information, refer to the Packing
Maintenance section below.
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.
Key numbers in this procedure are shown in figure 9
unless otherwise indicated.
WARNING
Avoid personal injury from sudden
release of process pressure. Before
performing any maintenance
operations:
DAlways wear protective gloves,
clothing, and eyewear when
performing any maintenance
operations to avoid personal injury.
DDisconnect 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.
DUse bypass valves or completely
shut off the process to isolate the
valve from process pressure. Relieve
process pressure on both sides of the
valve. Drain the process media from
both sides of the valve.
DVent the power actuator loading
pressure.
DUse lockout procedures to be
sure that the above measures stay in
effect while you work on the
equipment.
DThe 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.
DCheck with your process or safety
engineer for any other hazards that
may be present from exposure to
process media.
Removing and Replacing the Actuator
Refer to the appropriate actuator instruction manual
for actuator removal and replacement procedures.
The actuator stops or travel stops must limit the
rotation of the valve shaft. See the CAUTION below.
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 can result in damage to
the valve, shaft(s), or other valve
components.
Packing Maintenance
The Type 8532 control valve is designed so the
packing can be replaced without removing the valve
from the process pipeline.
CAUTION
For non-ENVIRO-SEAL packing:
Tighten the packing follower nuts only
enough to prevent shaft leakage.
Excessive tightening will accelerate
wear of the packing and could produce
higher friction loads on the valve stem.
Usually, packing leakage can be eliminated by
merely tightening the hex nuts (key 15) located
above the packing follower (key 11) while the valve
is in the pipeline. However, if leakage continues, the
packing must be replaced.
For PTFE ENVIRO-SEAL packing systems, refer to
the separate instruction manual, ENVIRO-SEAL
Packing System for Rotary Valves, Form 5305, (see
figure 10).
CAUTION
Never use a wrench or pliers on the
splined (upper) shaft (key 3). A