Emerson Fisher POSI-SEAL A31A Bedienungsanleitung

www.Fisher.com

Fisher™POSI‐SEAL™A31A Cryogenic High

Performance Butterfly Valve

Contents

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

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

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

Description 2.................................

Installation 2..................................

Adjusting the Actuator Travel Stops or Travel 4.....

Valve Orientation 4............................

Preparing for Installation 4......................

Installing Wafer‐Style Valves 6...................

Installing Single‐Flange Valves 8.................

Maintenance 8.................................

Replacing Packing 9...........................

Removing the Valve from the Pipeline 10..........

Removing/Installing the Seal Ring 11.............

NOVEXtSeal Installation 12................

Kel‐F and Kel‐F/aluminum Seal Installation 13..

Anti‐Blowout Protection, Packing,

Valve Shaft(s), Disk, and Bearing

Maintenance 15...........................

Disassembly 16............................

Installing a One‐Piece Shaft 18...............

Installing a Two‐Piece Shaft 19...............

Installing the Gasket Retainer 21.............

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

Parts List 22...................................

Figure 1. Fisher A31A Cryogenic Valve with

1035 Actuator

W7451 / IL

Introduction

Scope of Manual

This instruction manual provides installation, maintenance, and parts ordering information for the POSI‐SEAL A31A

Cryogenic high‐performance butterfly valves (see figure 1). The Series C (3‐ through 6‐inch Class 150 & 300 and 8‐inch

Class 150) feature a cast one‐piece extension. The 8‐inch Class 300, and 10‐ through 24‐inch Class 150 & 300 designs

have a two‐piece extension. For information regarding actuators and accessories, refer to separate instruction

manuals.

Do not install, operate, or maintain an A31A Cryogenic valve without being fully trained and qualified in valve,

actuator, and accessory installation, operation, and maintenance. To avoid personal injury or property damage, it is

important to carefully read, understand, and follow all of the contents of this manual, includingall safety cautions and

warnings. If you have any questions about these instructions, contact your Emerson sales office.

Instruction Manual

D500242X012

A31A Cryogenic-Rotary Valve

February 2019

Instruction Manual

D500242X012

A31A Cryogenic-Rotary Valve

February 2019

Table 1. Specifications

Available Valve Configurations

JFlangeless, wafer‐style or Jsingle‐flange (lugged)

control valve with a one‐piece extension housing and

either NOVEX seal (standard), Kel‐F seal (optional) or

Kel‐F seal with Aluminum backup V‐ring (optional)

Valve Sizes

J3, J4, J6, J8, J10, J12, J14, J16, J18,

J20, or J24‐inch

End Connection Style

JFlangeless, wafer‐style or Jsingle flange valve

body designed to fit between raised‐face mating

flanges per ASME B16.5 Class 150 or 300

Maximum Inlet Pressure/Temperature(1)

Consistent with ANSI Class J150 and J300

pressure/temperature ratings per ASME B16.34,

except that 38_C (100_F) rating is applicable to

‐254_C (‐425_F). NOVEX seal maximum

pressure/temperature rating is the same as the valve

body. See figure 2 for rating of Kel‐F seal.

Valve Classification

Face‐to‐face dimensions are in compliance with MSS

SP68 and API 609 standards; valve bodies are

designed for installation between ASME B16.5 Class

150 or 300 raised‐face flanges

Materials of Construction

See Bulletin 21.1:Cryogenic‐Rotary

Installed Valve Orientation

See figure 3 for orientation guidelines

Available Actuators

J1035, JBettis Pneumatic or J1051/1052

Disk Rotation

Clockwise to close

1. The pressure/temperature limits in this manual, and any applicable code or standard limitation, should not be exceeded.

Description

The A31A Cryogenic Series C (3‐ through 6‐inch Class 150 & 300 and 8‐inch Class 150) High Performance Butterfly

Valve features either a double D drive shaft to allow direct coupling to the 1035 actuator or keyed shaft (optional). The

A31A Cryogenic is a reliable, high‐performance butterfly valve for cryogenic applications.

The A31A Cryogenic is available in either a flangeless (wafer) or a single‐flange (lugged) valve body style and a variety

of seals.

The standard seal for the A31A Cryogenic valve is the NOVEXtmetal seal which provides tight shutoff, low operating

torques and the ruggedness required for cryogenic service. Kel‐f and Kel‐f/aluminum seals are also available.

Installation

WARNING

Always wear protective gloves, clothing and eyewear when performing any installation operations to avoid injury.

To avoid personal injury or property damage resulting from the sudden release of pressure, do not install the valve

assembly where service conditions could exceed the limits given in this manual or on appropriate nameplates. Use

pressure‐relieving devices as required by government or accepted industry codes and good engineering practices.

Check with your process or safety engineer for any additional measures that must be taken to protect against process

media.

If installing into an existing application, also refer to the WARNING at the beginning of the Maintenance section in this

instruction manual.

Instruction Manual

D500242X012

A31A Cryogenic-Rotary Valve

February 2019

CAUTION

Responsibility for the safety of process media and compatibility of valve materials rests solely with the purchaser and

end‐user. When ordered, the valve configuration and construction materials were selected to meet particular pressure,

pressure drop, temperature, and controlled fluid conditions. Because pressure drop and temperature range capabilities

limit some combinations of materials, do not apply any other conditions to the valves without first contacting your

Emerson sales office.

Before installation check the maximum allowable inlet pressures for A31A Cryogenic valves shown in figure 2 and the

Specifications table.

Figure 2. Maximum Pressure/Temperature Ratings

CLASS 150, KEL‐F SEAL CLASS 300, KEL‐F SEAL

C0759‐1 / IL

KEL‐F

A4132‐1 / IL A3715‐2 / IL

Instruction Manual

D500242X012

A31A Cryogenic-Rotary Valve

February 2019

Adjusting the Actuator Travel Stops

WARNING

The edges of a rotating valve disk have a shearing effect that may result in personal injury. To avoid personal injury, keep

clear of the disk edges when rotating the disk.

CAUTION

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

adjusted so that the disk stop in the valve body does not absorb the output of the actuator. Failure to limit actuator travel

as described in the next step can result in damage to the valve shaft or other valve parts.

1. Locate the actuator travel stop that establishes the closed position of the valve disk. When adjusting the travel stop

or travel, make sure that the disk is from 0.03 to 0.76 mm (0.001 to 0.030 inch) away from the internal stop in the

valve body. This adjustment is necessary to be certain that the actuator output torque is fully absorbed by the

actuator travel stop or by the actuator. The internal travel stop in the valve body should not absorb any of the

actuator torque.

2. Before installing the valve/actuator assembly in the process line, cycle the valve several times to be sure the valve

disk returns to the proper position.

Valve Orientation

Note

When the process flow is gas, install the valve with the shaft in the horizontal position.

When the process flow is liquid the valve should be installed at an incline above horizontal of at least 20 degrees, as shown in

figure 3. Inclined installation can enhance valve performance by preventing direct cryogenic liquid contact with the packing.

The A31A Cryogenic valve is designed for installation with the shaft(s) in any orientation around the pipeline:

horizontal, vertical, or at an intermediate angle. However, when installing the valve in cryogenic service, follow the

recommendations below, which are based on application experience:

D Installing the valve with the extension housing or bonnet four to six inches beyond the cold box (see figure 3)

provides space for slight boil‐off of cryogenic liquids.

D When installed with the extension stem inclined 20 degrees above horizontal, the vapor pocket resulting from

cryogenic liquid boil‐off prevents the colder liquid from contacting the stem packing area.

D Recommended installation for optimum seal performance of the NOVEX and Kel‐F seals is reverse flow (into the

back of the disk).

D A flow tag with an arrow is provided for proper installation.

Preparing for Installation

CAUTION

To avoid damage to the valve disk during installation, the valve must be in the fully‐closed position. If the A31A Cryogenic

valve is equipped with a fail‐open actuator, remove the actuator before installing the valve/actuator assembly or cycle the

Instruction Manual

D500242X012

A31A Cryogenic-Rotary Valve

February 2019

valve into the fully closed position. Then, take appropriate steps to ensure that the actuator does not cause the valve to

open during installation.

1. The A31A Cryogenic valve is normally shipped as part of an assembly with an actuator and other accessories. If the

valve and actuator have been purchased separately or if the actuator has been removed for maintenance, properly

mount the actuator and adjust valve/actuator travel and all travel stops before inserting the valve into the line.

Follow the instructions in this manual for Adjusting Travel stops. Also, refer to a separate actuator instruction manual

for detailed actuator mounting and adjustment procedures.

2. If not previously removed, remove the protective end covers from the valve and inspect the valve body to be certain

that it is free of foreign material. Also, be certain that adjacent pipelines are free of any foreign material, such as

pipe scale or welding slag that could damage the valve seating surfaces.

CAUTION

The A31A Cryogenic valve is designed for use with the appropriate piping schedule for the specified ANSI class. Minimum

inside diameters for flanges or pipe mating with valves are shown in tables 2 and 3. Be certain to align the valve accurately

to avoid contact between the disk and the flanges. Improper alignment or insufficient space for disk rotation could result in

damage to the disk.

Additionally, be certain that the valve body and any adjacent pipelines are free of foreign material, such as pipe scale or

welding slag that could damage the valve seating surfaces.

Table 2. Valve Body Data, Class 150

VALVE SIZE, INCHES

SHAFT DIAMETER AT

YOKE BEARING

FACE‐TO‐FACE DIMEN‐

SION(1)

MINIMUM

I.D.(2)

APPROXIMATE WEIGHT

Wafer Single Flange

mm Kilograms

3 16 47.6 71.4 12 16

4 19 54.0 93.7 21 22

6 25 57.2 147.6 24 28

8 25 63.5 196.9 34 40

10 32 71.4 254.0 57 67

12 38 81.0 298.5 74 93

14 30 92 330 87 120

16 32 102 378 133 182

18 38 114 429 170 231

20 44 127 470 210 302

24 57 154 575 326 455

Inches Pounds

3 5/8 1‐7/8 2.81 27 36

4 3/4 2‐1/8 3.69 46 48

6 1 2‐1/4 5.81 53 61

8 1 2‐1/2 7.75 75 89

10 1‐1/4 2‐13/16 10.00 125 148

12 1‐1/2 3‐3/16 11.75 164 206

14 1‐3/16 3‐5/8 13 191 265

16 1‐1/4 4 14‐7/8 294 401

18 1‐1/2 4‐1/2 16‐7/8 374 510

20 1‐3/4 5 18‐1/2 463 665

24 2‐1/4 6‐1/16 22‐5/8 719 1004

1. Face‐to‐face dimensions are in compliance with MSS SP68 and API 609 specifications.

2. Minimum I.D. is the minimum pipe or flange I.D. required for disk swing clearance.

Instruction Manual

D500242X012

A31A Cryogenic-Rotary Valve

February 2019

Table 3. Valve Body Data, Class 300

VALVE SIZE, INCHES

SHAFT DIAMETER AT

YOKE BEARING

FACE‐TO‐FACE DIMEN‐

SION(1)

MINIMUM

I.D.(2)

APPROXIMATE WEIGHT

Wafer Single Flange

mm Kilograms

3 16 47.6 71.4 12 16

4 19 54.0 93.7 21 24

6 25 57.2 146.1 24 28

8 32 73.0 186.2 47 52

10 38 85.3 230.1 80 100

12 44 94.1 281.7 103 135

14 44 117 305 142 249

16 44 133 349 213 325

18 57 149 391 259 434

20 70 159 442 401 582

24 70 181 523 512 863

Inches Pounds

3 5/8 1‐7/8 2.82 27 35

4 3/4 2‐1/8 3.69 46 52

6 1 2‐1/4 5.75 53 61

8 1‐1/4 2‐7/8 7.32 104 115

10 1‐1/2 3‐23/64 9.06 176 220

12 1‐3/4 3‐45/64 11.09 227 298

14 1‐3/4 4‐5/8 12 314 548

16 1‐3/4 5‐1/4 13‐3/4 470 716

18 2‐1/4 5‐7/8 15‐3/8 570 956

20 2‐3/4 6‐1/4 17‐13/32 884 1282

24 2‐3/4 7‐1/8 20‐19/32 1128 1903

1. Face‐to‐face dimensions are in compliance with MSS SP68 and API 609 specifications.

2. Minimum I.D. is the minimum pipe or flange I.D. required for disk swing clearance.

3. Select the appropriate gaskets for the application. Flat sheet, spiral wound, or other gasket types, made to ANSI

B16.5 group or user's standard, can be used on the valves depending on the service conditions of the application.

4. Refer to table 4 for the quantity and size of flange bolts required.

Installing Wafer‐Style Valves

WARNING

The edges of a rotating valve disk have a shearing effect that may result in personal injury. To avoid personal injury, keep

clear of the disk edges when rotating the disk.

1. See figure 3 for recommended valve orientation. See table 4 for flange bolt specifications. Install the lower flange

bolts first to form a cradle for the valve.

Instruction Manual

D500242X012

A31A Cryogenic-Rotary Valve

February 2019

Table 4. Hex Head Screw, Stud Bolt and Cap Screw Data(1)

VALVE SIZE, INCH NUMBER SIZE DIA. INCH & THREAD LENGTH, INCH

Class 150 Class 300 Class 150 Class 300 Class 150 Class 300

Wafer Style with Stud Bolts

3 4 8 5/8‐11 3/4‐10 5‐3/4 6

4 8 8 5/8‐11 3/4‐10 6 6‐1/2

6 8 12 3/4‐10 3/4‐10 6‐1/2 7‐1/2

8 8 12 3/4‐10 7/8‐9 7 9

10 12 16 7/8‐9 1‐8 8 10

12 12 16 7/8‐9 1‐1/8‐8 8‐1/2 11

14 12 16 1-8 1‐1/8-8 9‐1/2 12

16 16 16 1-8 1‐1/4-8 10 13‐1/2

18 16 20 1‐1/8-8 1‐1/4-8 11 13‐3/4

20 20 20 1‐1/8-8 1‐1/4-8 12 14‐1/2

24 20 20 1‐1/4-8 1‐1/2-8 14 16‐1/2

Wafer Style with Cap Screws

14 ‐ ‐ ‐ 8‐ ‐ ‐ 1‐1/8-8 ‐ ‐ ‐ 3‐1/2

16 ‐ ‐ ‐ 8‐ ‐ ‐ 1‐1/4-8 ‐ ‐ ‐ 3‐3/4

18 ‐ ‐ ‐ 8‐ ‐ ‐ 1‐1/4-8 ‐ ‐ ‐ 4

20 ‐ ‐ ‐ 8‐ ‐ ‐ 1‐1/4-8 ‐ ‐ ‐ 4

24 ‐ ‐ ‐ 8‐ ‐ ‐ 1‐1/2-8 ‐ ‐ ‐ 4‐1/2

Single Flange Style with Cap Screws

3 8 16 5/8‐11 3/4‐10 1‐7/8 2

4 16 16 5/8‐11 3/4‐10 2 2‐1/4

6 16 24 3/4‐10 3/4‐10 2 2‐1/2

8 16 24 3/4‐10 7/8‐9 2‐1/4 3

10 24 32 7/8‐9 1‐8 2‐1/2 3

12 24 32 7/8‐9 1‐1/8‐8 2‐3/4 3‐3/8

14 24 40 1-8 1‐1/8‐8 2‐3/4 3‐1/2

16 32 40 1-8 1‐1/4-8 3 3‐3/4

18 32 48 1‐1/8‐8 1‐1/4-8 3‐1/4 4

20 40 48 1‐1/8‐8 1‐1/4-8 3‐1/2 4

24 40 48 1‐1/4-8 1‐1/2-8 3‐1/2 4‐1/2

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

2. Properly orient the valve according to the specific application. For optimum performance, install the valve so that

the shaft will be on the high pressure side of the valve at shutoff (reverse flow). Install the valve and the gaskets

between the flanges into the cradle formed by the flange bolts.

3. Install the remaining flange bolts, making sure to center the gaskets on the gasket sealing surfaces of the flange

and valve body.

4. Tighten the flange bolts in an alternating criss‐cross fashion to a torque value of one‐fourth of the final bolting

torque. Repeat this procedure several times increasing the torque value each time by a fourth of the final desired

torque. When the final torque value has been applied, tighten each flange bolt again to allow for gasket

compression.

Note

The optional graphite ribbon packing and metal bearings are composed of all conductive material to electrically bond the shaft to

the valve for hazardous area service, as opposed to the non‐conductive PTFE packing and bearings.

Instruction Manual

D500242X012

A31A Cryogenic-Rotary Valve

February 2019

5. For more information, refer to the Packing Maintenance section below.

Installing Single‐Flange Valves

WARNING

The edges of a rotating valve disk have a shearing effect that may result in personal injury. To avoid personal injury, keep

clear of the disk edges when rotating the disk.

1. See figure 3 for recommended valve orientation. See table 4 for hex head cap screw specifications.

2. Properly orient the valve according to the specific application. For optimum shutoff, install the valve for reverse

flow.

3. Position the valve between the flanges. Be sure to leave enough room for the flange gaskets. Install the lower flange

bolts.

4. Select the appropriate gaskets for the application. Flat sheet, spiral wound, or other gasket types, made to the ANSI

B16.5 group standard or user's standard, can be used on the valve depending on the service conditions of the

application. Install the gaskets and align the valve and the gaskets.

5. Install the remaining bolts.

6. Tighten the flange bolts in an alternating criss‐cross fashion to a torque value of one‐fourth of the final bolting

torque. Repeat this procedure several times increasing the torque value each time by a fourth of the final desired

torque. When you get to the final torque value, tighten each flange bolt again to allow for gasket compression.

Note

The optional graphite ribbon packing and metal bearings are composed of all conductive material to electrically bond the shaft to

the valve for hazardous area service, as opposed to the non‐conductive PTFE packing and bearings.

Maintenance

Valve parts are subject to normal wear and must be inspected and replaced as necessary. The frequency of inspection

and replacement depends upon the severity of service conditions.

WARNING

Avoid personal injury from sudden release of process pressure. Before performing any maintenance operations:

D Always wear protective gloves, clothing and eyewear when performing any maintenance operations to avoid personal

injury.

D Disconnect any operating lines providing air pressure, electric power, or a control signal to the actuator. Be sure the

actuator cannot suddenly open or close the valve.

D Use bypass valves or completely shut off the process to isolate the valve from process pressure. Relieve process pressure

on both sides of the valve. Drain the process media from either side of the valve.

D Vent the power actuator loading pressure and relieve any actuator spring precompression.

D Use lock‐out procedures to be sure that the above measures stay in effect while you work on the equipment.

D The valve packing box may contain process fluids that are pressurized even when the valve has been removed from the

pipeline. Process fluids may spray out under pressure when removing the packing hardware or packing rings, or when

loosening the packing box pipe plug.

Instruction Manual

D500242X012

A31A Cryogenic-Rotary Valve

February 2019

D Check with your process or safety engineer for any additional measures that must be taken to protect against process

media.

Figure 3. Properly Installed Cryogenic Valve

16B5084 / DOC

COLD BOX

TRANSITION

4” ‐ 8” MIN

20_MIN

Replacing Packing

The A31A Cryogenic valve is designed so the packing can be replaced without removing the valve from the process

pipeline, provided there is no internal pressure. Packing may be PTFE V‐rings or graphite.

Key numbers for the parts in this section may be found in figures 7 and 8.

CAUTION

Tighten the packing flange only enough to prevent shaft leakage. Excessive tightening will only accelerate wear of the

packing and could produce higher torques on the valve than expected.

Usually, packing leakage can be eliminated by merely tightening the hex nuts (key 15) located above the packing

flange while the valve is in the pipeline. However, if leakage continues, replace the packing.

CAUTION

Never use a wrench or pliers on the valve shaft. A damaged shaft could cut the packing and allow leakage.

Instruction Manual

D500242X012

A31A Cryogenic-Rotary Valve

February 2019

1. Before loosening any parts, isolate the valve from the line pressure, release pressure from both sides of the valve

body, and drain the process media from both sides of the valve.

2. Then, remove the hex nuts (key 18) and lift off the packing follower (key 11). The packing (key 13) is now

accessible. Refer to figure 6 for details of the blowout protection.

3. Use a packing extractor to remove the packing. Insert the corkscrew‐like end of the tool into the first piece of

packing and pull firmly to remove the packing. Repeat this process until all packing has been removed.

Note

For valves equipped with non‐metallic (PTFE composition) bearings, perform the following step to inspect and/or replace the

outboard bearing (key 10).

4. Using a formed hook or probe, carefully remove the packing ring (key 12) and inspect the outboard bearing (key

10) for excessive intrusion or wear. Outboard bearings are only found on the 3‐ through 12‐inch sizes. If necessary,

remove the bearing carefully using needle‐nose pliers and install a new bearing and existing packing ring using the

packing follower (key 11) as a driver.

CAUTION

Be careful when cleaning the packing box. Scratches to the shaft or inside diameter of packing bore might cause leakage.

5. Before installing new packing, clean the packing box.

6. Install new packing (key 13) one ring at a time, using the packing follower (key 11) as a driver. If using split‐ring

packing, stagger the splits in the rings to avoid creating a leak path.

7. Reinstall all parts. Tighten the packing follower nuts (key 18) as needed to stop leakage under operating conditions.

Removing the Valve from the Pipeline

1. Disconnect any operating lines providing air pressure, electric power, or a control signal to the actuator. Be sure the

actuator cannot suddenly open the valve. Vent the power actuator loading pressure.

2. Use bypass valves or completely shut off the process to isolate the valve from process pressure. Relieve process

pressure on both sides of the valve. Drain the process media from either side of the valve.

CAUTION

Damage to the valve disk, piping or pipe flanges can occur if the disk is not closed when the valve is being removed from

the pipeline. If necessary, stroke the actuator to place the disk in the closed position while removing the valve from the

pipeline.

3. Loosen the flange bolting that holds the valve. Make sure the valve cannot slip or twist while loosening and

removing the bolting.

4. Make certain the valve disk is closed and remove the valve from the pipeline. Support the valve properly and move

the valve to an appropriate work area.

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