Emerson Fisher 8532 Manuale utente

www.Fisher.com

Fisher™8532 High-Performance Butterfly Valve

Contents

Introduction 1.................................

Scope of Manual 1.............................

Description 1.................................

Specifications 2...............................

Educational Services 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 9......

Maintenance 11................................

Removing and Replacing the Actuator 12.........

Packing Maintenance 12........................

Removing the Valve 13.........................

Seal Maintenance 14...........................

PTFE Seals 15.............................

NOVEX, Phoenix III and/or

Phoenix III Fire‐Tested Seals 16............

Anti‐Blowout Design, Packing, Valve Shaft,

Disk, and Bearing Maintenance 17.............

Installing the Two‐Piece Shaft 19.............

Gasket Retainer 21............................

Parts Ordering 22...............................

Parts List 24...................................

Figure 1. Fisher 8532 Valve with 1061 Actuator and

FIELDVUE™ DVC6200 Digital Valve Controller

W9138-1

Introduction

Scope of Manual

This instruction manual provides installation, maintenance, and parts information for NPS 14 through 24 Fisher 8532

high-performance butterfly valves.

Do not install, operate, or maintain an 8532 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 the contents of this manual, including all safety cautions and warnings. If you

have any questions about these instructions, contact your Emerson sales office or Local Business Partner before

proceeding.

Description

The valve is available in either a wafer (flangeless), lugged (single‐flange), or double flange body design, with a variety

of seals and internal components. The pressure‐assisted seal provides tight shutoff. The spline or keyed drive shaft

combines with a variety of actuators. Maximum inlet pressure/temperature ratings are consistent with CL150 and

CL300.

Instruction Manual

D101550X012

8532 Valve

June 2017

Instruction Manual

D101550X012

8532 Valve

June 2017

Table 1. Specifications

Valve Size and End Connection Styles

JNPS 14, J16, J18, J20, or J24 valves, in

Jwafer (flangeless), Jlugged (single‐flange), or

Jdouble‐flange valve bodies with raised‐face

flanges, CL150 or CL300

Maximum Pressure Drop(1)

Consistent with CL150 and CL300

pressure/temperature ratings per ASME B16.34

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 IV (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

Cryogenic: For cryogenic seal applications, consult

your Emerson sales office or Local Business Partner.

Available Seal Configurations

Standard Constructions

See figure 2 and table 2

Standard Construction Materials

See table 2

Flow Characteristic

Modified equal percentage

Flow Coefficients

See Fisher Catalog 12

Flow Coefficient Ratio(2)

100 to 1

Noise Levels

See Fisher Catalog 12 for sound/pressure level

prediction

Valve Body Classification

Wafer and Lugged face‐to‐face dimensions are in

compliance with MSS SP68 and API 609 standards.

Double Flange valve bodies comply with API 609

short face-to-face dimensions. Valve bodies are

designed for installation between ASME B16.5 CL150

and CL300 raised‐face flanges

Disk 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‐SEAL™Packing

This optional packing system provides improved

sealing, guiding, and transmission of loading force to

control liquid and gas emissions. Contact your

Emerson sales office or Local Business Partner 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.

Educational Services

For information on available courses for Fisher 8532 valves, as well as a variety of other products, contact:

Emerson Automation Solutions

Educational Services - Registration

Phone: 1-641-754-3771 or 1-800-338-8158

E-mail: [email protected]

emerson.com/fishervalvetraining

Instruction Manual

D101550X012

8532 Valve

June 2017

Table 2. Material Temperature Ratings

COMPONENT AND MATERIAL OF CONSTRUCTION(1) TEMPERATURE RANGE

_C_F

Valve Body(2)

Carbon Steel (WCC or SA 516-70)(7)

CF8M (316 SST)

CF8M/CF10M (316/316H)(3) Dual-Certified

-29 to 427

-198 to 538

over 538 to 816

-20 to 800

-325 to 1000

over 1000 to 1500

Disk

CF8M (316 SST)

CF8M/CF10M (316/316H)(3) Dual-Certified

-198 to 538

over 538 to 816

-325 to 1000

over 1000 to 1500

Disk Coating

Chromium Carbide

Chrome Plating

Chromium Coating

-198 to 916

-254 to 316

-254 to 593

-325 to 1500

-425 to 600

-425 to 1100

Shaft

S20910

S17400 (17-4 pH 1025)

N07718

N07750

N05500

-198 to 538

-73 to 427

-254 to 704

over 593 to 816

-198 to 482

-325 to 1000

-100 to 800

-425 to 1300

over 1100 to 1500

-325 to 900

Bearings(6)

PEEK (standard)

S31600(4)

R30006 (Alloy 6)

Bronze

-73 to 260

-198 to 816

-254 to 302

-100 to 500

-325 to 1500

-425 to 575

Packing

PTFE Packing and PTFE ENVIRO-SEAL Packing

Graphite packing

Graphite packing with oxidizing media

Graphite ENVIRO-SEAL Packing

-148 to 232

-198 to 916

-198 to 538

-148 to 315

-325 to 450

-325 to 1500

-325 to 1000

-325 to 600

Seal Ring and

Backup Ring

PTFE Seal Ring

Nitrile Backup O-Ring

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

UHMWPE(5) Seal Ring (CL150 Only)

EPR Backup O-Ring

Fluorocarbon Backup O-Ring

-54 to 93

-29 to 93

-65 to 200

-20 to 200

Phoenix III and/or Fire Tested Construction

S31600 and PTFE Seal Ring with Nitrile Backup O-Ring

Chloroprene 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

-100 to 200

Seal Ring

NOVEX S31600 Seal(4) Ring (CL150)

NOVEX S31600 Seal(4) Ring (CL300)

NOVEX S21800 Seal(4) Ring (CL300)

-29 to 538

-29 to 816

-20 to 1000

-20 to 1500

-40 to 1500

Cryogenic Seal Ring Contact your Emerson Sales office or Local Business Partner

1. NACE trim constructions are available; consult your Emerson sales office.

2. Special gasket retainer bolts are required for over 482_C (900_F)

3. Special retaining ring screws for lugged valves over 538_C (1000_F)

4. For a complete material description, contact your Emerson sales office.

5. UHMWPE stands for ultra high molecular weight polyethylene.

6. Special thrust bearings are required for high temp. applications over 343_C (650_F) (with 6-and 12-inch shaft extensions). Constructions with carbon steel valves and SST disks may require

special thrust bearings at temperatures less than 343_C (650_F).

7. Cast or wrought /plate grades used interchangeably, depending upon availability - unless requested by customer.

Instruction Manual

D101550X012

8532 Valve

June 2017

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:

D Do not remove the actuator from the valve while the valve is still pressurized.

D Always wear protective gloves, clothing, and eyewear when performing any maintenance operation.

D Do not install the valve assembly where service conditions could exceed 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 other hazards that may be present from exposure to 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 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 sales office or Local Business Partner.

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 disk will occur if any pipe flanges or piping connected to the valve interfere with the disk rotation path.

Minimum inside diameters for flanges or pipe mating with valves are shown in tables 3 and 4.

Instruction Manual

D101550X012

8532 Valve

June 2017

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 disk (key 2, figure 9 or 10) close with a shearing, cutting motion. To avoid personal injury,

keep hands, tools, and other objects away from the disk while stroking the valve.

If the 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.

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

Wafer and

Lugged Double-Flange

mm Wafer Lugged Double-Flange

14 30.2 92.1 191 331.2 71.7 94.8 152

16 31.75 101.6 216 375.2 93.9 137.9 201

18 38.1 114.3 222 418.8 139.3 178.3 243

20 44.45 127.0 229 464.1 166.9 223.6 277

24 57.15 154.0 267 580.9 255.4 350.6 434

VALVE SIZE,

NPS

SHAFT DIA. AT

YOKE BEARING

FACE‐TO‐FACE DIMENSION(1)

MINIMUM

I.D.(2) APPROXIMATE WEIGHT, POUNDS

Wafer and

Lugged Double-Flange

Inches Wafer Lugged Double-Flange

14 1‐3/16 3.625 7.50 13.04 158 209 335

16 1‐1/4 4 8.50 14.77 207 304 443

18 1/2 4.5 8.75 16.49 307 393 535

20 1‐3/4 5 9.00 18.27 368 493 611

24 2‐1/4 6.0625 10.50 22.87 563 773 956

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. Applies to wafer and lugged valve bodies only.

Instruction Manual

D101550X012

8532 Valve

June 2017

Table 4. Valve Body Data, CL300

VALVE SIZE,

NPS

SHAFT DIA. AT

YOKE BEARING

FACE‐TO‐FACE DIMENSION(1)

MINIMUM

I.D.(2) APPROXIMATE WEIGHT, KILOGRAMS

Wafer and

Lugged Double-Flange

mm Wafer Lugged Double-Flange

14 44.45 117.5 290 304.3 125.2 231.3 345

16 44.45 133.4 310 346.2 189.2 300.7 563

18 57.15 149.2 330 389.4 237.7 411.4 591

20 69.9 155.6 350 442.0 370.6 551.1 706

24 69.9 181.0 390 523.2 477.2 828.7 1307

VALVE SIZE,

NPS

SHAFT DIA. AT

YOKE BEARING

FACE‐TO‐FACE DIMENSION(1)

MINIMUM

I.D.(2) APPROXIMATE WEIGHT, POUNDS

Wafer and

Lugged Double-Flange

Inches Wafer Lugged Double-Flange

14 1‐3/4 4.625 11.41 11.98 276 510 760

16 1‐3/4 5.25 12.20 13.63 417 663 1240

18 2‐1/4 5.875 13.00 15.32 524 907 1303

20 2‐3/4 6.125 13.78 17.40 817 1215 4556

24 2‐3/4 7.125 15.35 20.59 1052 1827 2881

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. Applies to wafer and lugged valve bodies only.

CAUTION

When using an actuator, the actuator travel stop (or actuator travel, for actuators without adjustable stops) must be

adjusted so the disk 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.

An 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 disk will occur if any pipe flanges or piping connected to the valve interfere with the disk rotation path. Be

certain to align the valve accurately to avoid contact between the disk (key 2) and the flanges.

Instruction Manual

D101550X012

8532 Valve

June 2017

Figure 2. Available Seal Configurations

PTFE OR UHMWPE SOFT

SEAL WITH BACKUP O-RING

BACKUP

O-RING

SEAL RING

RETAINING

RING

VALVE DISK

VALVE BODY

T-SLOT

NORMAL

FLOW

DIRECTION

NOVEX METAL SEAL

GRAPHITE

GASKET

METAL

SEAL RING

RETAINING

RING

VALVE DISK

VALVE BODY

NORMAL

FLOW

DIRECTION PHOENIX III

FIRE SAFE SEAL

BACKUP

O-RING

METAL

SEAL RING

GRAPHITE

GASKET

VALVE DISK

VALVE BODY

NORMAL

FLOW

DIRECTION

RESILIENT

INSERT

B2313-3

Adjusting the Actuator Travel Stops or Travel

Key number locations are shown in figures 9 and 10, unless otherwise noted.

1. Refer to the actuator instruction manual to locate the actuator travel stop that controls the closed position of the

valve disk (key 2). When adjusting the travel stop or travel, make sure that the disk 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

disk returns to the proper position.

Installing the Valve

The maximum allowable inlet pressures for 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 2.

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 disk during installation, the valve must be in the fully closed position. If the 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.

Instruction Manual

D101550X012

8532 Valve

June 2017

Figure 3. Stud Bolts for Installation (also see table 5)

WAFER BODY OR LUGGED BODY

WITH DRILLED THROUGH HOLES

LUGGED BODY AND TAPPED HOLES IN WAFER

BODY (NEAR SHAFT BORE)

ABB

Table 5. Hex Head Screw, Stud Bolt and Cap Screw Data(1)(2)

Wafer Bodies or Lugged Bodies with Drilled Through Holes

Valve Size,

NPS

Valve

Rating

Number of

Through

Holes

Number of

Tapped

Holes

Thread Size Number of

Studs

Length of Studs (A) Number of

Cap Screws

Length of Cap Screws (B)

mm inch mm inch

14 150 12 0 1 - 8 UNC 12 241 9.50 0 --- ---

300 16 8 1-1/8 - 8 UNC 16 305 12.00 8 89 3.50

16 150 16 0 1 - 8 UNC 16 254 10.00 0 --- ---

300 16 8 1-1/4 - 8 UNC 16 343 13.50 8 95 3.75

18 150 16 0 1-1/8 - 8 UNC 16 279 11.00 0 --- ---

300 20 8 1-1/4 - 8 UNC 20 349 13.75 8 101 4.00

20 150 20 0 1-1/8 - 8 UNC 20 305 12.00 0 --- ---

300 20 8 1-1/4 - 8 UNC 20 368 14.50 8 101 4.00

24 150 20 0 1-1/4 - 8 UNC 20 356 14.00 0 --- ---

300 20 8 1-1/2 - 8 UNC 20 419 16.50 8 114 4.50

Lugged Bodies with Threaded Holes

Valve Size,

NPS

Valve

Rating

Number of

Through

Holes

Number of

Tapped

Holes

Thread Size Number of

Studs

Length of Studs (A) Number of

Cap Screws

Length of Cap Screws (B)

mm inch mm inch

14 150 0 24 1 - 8 UNC 0 --- --- 24 70 2.75

300 0 40 1-1/8 - 8 UNC 0 --- --- 40 89 3.50

16 150 0 32 1 - 8 UNC 0 --- --- 32 76 3.00

300 0 40 1-1/4 - 8 UNC 0 --- --- 40 95 3.75

18 150 0 32 1-1/8 - 8 UNC 0 --- --- 32 82 3.25

300 0 48 1-1/4 - 8 UNC 0 --- --- 48 101 4.00

20 150 0 40 1-1/8 - 8 UNC 0 --- --- 40 89 3.50

300 0 48 1-1/4 - 8 UNC 0 --- --- 48 101 4.00

24 150 0 40 1-1/4 - 8 UNC 0 --- --- 40 95 3.75

300 0 48 1-1/2 - 8 UNC 0 --- --- 48 114 4.50

Double Flange Bodies

Valve Size,

NPS

Valve

Rating

Number of

Through

Holes

Number of

Tapped

Holes

Thread Size Number of

Studs

Length of Studs (A) Number of

Cap Screws

Length of Cap Screws (B)

mm inch mm inch

14 150 16 8 1 - 8 UNC 16 146 5.75 8 70 2.75

300 32 8 1-1/8 - 8 UNC 32 191 7.50 8 102 4.00

16 150 24 8 1 - 8 UNC 24 152 6.00 8 76 3.00

300 32 8 1-1/4 - 8 UNC 32 203 8.00 8 108 4.25

18 150 24 8 1-1/8 - 8 UNC 24 159 6.25 8 82 3.25

300 40 8 1-1/4 - 8 UNC 40 216 8.50 8 108 4.25

20 150 32 8 1-1/8 - 8 UNC 32 165 6.50 8 82 3.25

300 40 8 1-1/4 - 8 UNC 40 222 8.75 8 114 4.50

24 150 32 8 1-1/4 - 8 UNC 32 187 7.38 8 95 3.75

300 40 8 1-1/2 - 8 UNC 40 248 9.75 8 127 5.00

1. Threaded engagement in accordance with ASME B31.3 “Chemical Plant and Petroleum Refinery Piping.”

2. Bolting lengths are base on installation of valve between standard raised face flanges utilizing flange gaskets with a final compression thickness of 0.125 inch. When gaskets used have a final

compression thickness less than 0.125 inch, reduce bolting lengths shown by 0.25 inch.

Instruction Manual

D101550X012

8532 Valve

June 2017

Figure 4. Installation of Wafer‐Style Valves

A5557

1. See figure 4 for recommended valve orientation.

D For 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.

D For Lugged 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 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.

D For 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.

Instruction Manual

D101550X012

8532 Valve

June 2017

Figure 5. Proper Installation Steps

B2263‐1

VALVE IN CLOSED POSITION DURING INSTALLATION

(OR REMOVAL) TO PREVENT DAMAGE TO DISK SEALING

AREA. SHAFT HORIZONTAL

FLANGE GASKETS:

BE SURE THESE ARE

CENTERED ALONG WITH

VALVE

PIPE FLANGES:

OPENED ENOUGH TO ALLOW THE

VALVE AND GASKETS TO SLIP EASILY INTO PLACE

BOTTOM FLANGE BOLTS FORMING A CRADLE

FOR VALVE DURING INSTALLATION

FLANGE BOLTS TIGHTENED EVENLY TO

PREVENT GASKET LEAKAGE

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 Fisher ENVIRO‐SEAL Packing System for Rotary Valves (D101643X012) 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.

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.

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