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

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

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.

S21800

8532 Valve

Instruction Manual

Form 5288

November 2007

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

–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

–20 to 1000

–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.

8532 Valve

Instruction Manual

Form 5288

November 2007

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.

8532 Valve

Instruction Manual

Form 5288

November 2007

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

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

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

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

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

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

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