Bray McCANNALOK Series Manuale utente

McCANNALOK SERIES

CRYOGENIC HIGH PERFORMANCE

BUTTERFLY VALVES

Installation, Operation and Maintenance Manual

BRAY.COM THE HIGH PERFORMANCE COMPANY

McCANNALOK CRYOGENIC VALVE

Installation, Operation and Maintenance Manual

contained herein shall not be copied, transferred, conveyed, or displayed in any manner that would

violate its proprietary nature without the express written permission of Bray International, Inc.

2 of 18

1.0 Deﬁnition of Terms 3

2.0 Introduction 3

3.0 Parts Diagram 4

4.0 Handling Requirements 5

5.0 Long Term Storage 6

6.0 Installation 7

7.0 Maintenance 8

8.0 Stem Seal Replacement 9

9.0 Seat Replacement 11

10.0 Disc and Stem Replacement 12

11.0 Field Adjustments 15

12.0 Appendix A — Tables 16

TABLE OF CONTENTS

For information on this product and other Bray products, please visit BRAY.COM

McCANNALOK CRYOGENIC VALVE

Installation, Operation and Maintenance Manual

contained herein shall not be copied, transferred, conveyed, or displayed in any manner that would

violate its proprietary nature without the express written permission of Bray International, Inc.

3 of 18

READ AND FOLLOW THESE INSTRUCTIONS CAREFULLY.

SAVE THIS MANUAL FOR LATER USE.

1.0 DEFINITION OF TERMS

WARNING

Indicates a potentially hazardous situation which, if not avoided, could result in

death or injury.

CAUTION

Indicates a potentially hazardous situation which, if not avoided, may result in

injury.

NOTICE

Used without the safety alert symbol, indicates a potential situation which, if not

avoided, may result in an undesirable result or state, including property damage.

2.0 INTRODUCTION

2.1 The McCannalok Cryogenic high performance butterfly valve provides

industry leading cryogenic sealing technology and performance while

being produced to the highest quality standards. The valve is designed

to handle the most difficult medias in today's industrial environments,

liquid oxygen, liquid natural gas, and other cryogenic liquids.

2.2 Features Include:

2.2.1 Tight shutoff provided throughout a wide range of operating conditions.

2.2.2 Suitable for both modulating and on/off services, the McCannalok

Cryogenic butterfly valve is easily automated with your choice of manual

operators, electric and pneumatic actuators, positioners, and controls.

2.3 For additional information about McCannalok Cryogenic butterfly

valves — including application data, engineering specifications and

actuator selection, visit www.bray.com or contact your Bray distributor

or sales representative.

McCANNALOK CRYOGENIC VALVE

Installation, Operation and Maintenance Manual

contained herein shall not be copied, transferred, conveyed, or displayed in any manner that would

violate its proprietary nature without the express written permission of Bray International, Inc.

4 of 18

3.0 PARTS DIAGRAM — MCCANNALOK CRYOGENIC VALVE

ITEM

NO. DESCRIPTION

1Body

2Disc

3Stem

5Seat Retainer

6Locating Plug

7A Gasket (Locating Plug)

7B Gasket (Bonnet)

8A Upper Body Bearing

8B Lower Body Bearing

8C Bonnet Bearing

9Disc Spacer

12 Thrust Washer

13 Stem Seal Set

14 Grounding Washer

15 Stud

16 Gland Ring

17 Retaining Ring

18 Gland Retainer

19 Lock Washer

20 Hex Nut

21 Mounting Bracket

22 Socket Head Cap Screw

23 Taper Pin

24 Lock Washer

25 Socket Head Cap Screw

27 Seat Retainer Gasket

32 Seat

33 Bonnet

34 Socket Head Cap Screw

35 Lock Washer

McCANNALOK CRYOGENIC VALVE

Installation, Operation and Maintenance Manual

contained herein shall not be copied, transferred, conveyed, or displayed in any manner that would

violate its proprietary nature without the express written permission of Bray International, Inc.

5 of 18

4.0 HANDLING REQUIREMENTS

4.1 Packed Valves

4.1.1 Crates: Lifting and handling of the packed valves in crates shall be

carried out by a fork lift truck, by means of the appropriate fork hitches.

4.1.2 Cases: The lifting of packed valves in cases shall be carried out in

the lifting points and in the center of gravity position which has been

marked. The transportation of all packed material must be carried out

safely and following the local safety regulations.

4.2 Unpacked Valves

4.2.1 Lifting and handling of valves should be carried out by using

appropriate means and observing the carrying limits. Handling must

be carried out on pallets, protecting all machined surfaces to avoid any

damage.

4.2.2 With large bore valves, rigging the load must be carried out by using

the appropriate tools to prevent the valve from falling or moving during

the lifting and handling.

CAUTION

For valve handling and/or lifting, the lifting equipment (fasteners, hooks, etc.)

must be sized and selected while taking into account the valve weight indicated

in our packing list and/or delivery note. Lifting and handling must be made only

by qualified personnel.

Fasteners must be protected by plastic covers in sharp corner areas.

Caution must be taken during the handling to avoid this equipment passing

over workers or over any other place where a possible fall could cause injury or

damage. In any case, local safety regulations must be respected

McCANNALOK CRYOGENIC VALVE

Installation, Operation and Maintenance Manual

contained herein shall not be copied, transferred, conveyed, or displayed in any manner that would

violate its proprietary nature without the express written permission of Bray International, Inc.

6 of 18

5.0 LONG TERM STORAGE

5.1 McCannalok Cryogenic valves are cleaned and double bagged to form

a vapor barrier with desiccant bags to prevent moisture from collecting

on the valve. If the valves are to be stored before installation, storage

must be carried out in a controlled manner as follows:

5.1.1 Valves must be stored in a closed, clean and dry environment.

5.1.2 Valve disc to be in closed position and the body end faces must be

covered with appropriate flange protection. Flange protectors should

only be removed at the time of installation.

5.1.3 If the valve is automated for fail open service, the valve shall be

carefully protected to ensure there is no damage to the sealing

surfaces.

5.1.4 Valves should be stored indoors with a preferred temperature range

from 40°F (4°C) to 85°F (29°C).

5.1.5 The valves should be checked every three months to ensure the above

conditions are maintained.

5.1.6 If the valve vapor barrier bags are broken or compromised in any way,

valve shall be evaluated to determine if cleaning is necessary. Any dirt

or debris can prevent the valve from functioning properly.

WARNING

If valve is for oxygen service and the vapor barrier bags are compromised, the

valve must be disassembled and re-cleaned using approved oxygen cleaning

procedures before installation.

5.2 These are general guidelines for valve storage. Please consult the

factory for information regarding specific requirements.

McCANNALOK CRYOGENIC VALVE

Installation, Operation and Maintenance Manual

contained herein shall not be copied, transferred, conveyed, or displayed in any manner that would

violate its proprietary nature without the express written permission of Bray International, Inc.

7 of 18

6.0 INSTALLATION

6.1 The McCannalok Cryogenic valve is designed to be mounted between

ANSI flanges. When the valve is open, the disc will extend into the pipe

on both sides of the valve (the disc extends further on the body side

than the seat retainer side of the valve). Piping must be large enough to

allow the disc to clear the pipe.

6.2 In general, Class 150 valves will clear Schedule 40 pipe, and Class 300

valves will clear Schedule 80 pipe adequately.

CAUTION

If handle or actuator has been removed do not rotate disc beyond full open or

closed position — this could cause damage to sealing surfaces.

6.3 NOTE: McCannalok valves are equipped with travel limiters to prevent

over closure. The valve is opened by turning counterclockwise, closed

by turning clockwise. The double “D” flats or keyway at the top of the

stem is parallel to the disc edge.

CAUTION

Verify and check the preferred flow direction prior to installation.

6.4 The McCannalok Cryogenic valve’s installation orientation is with the

seat retainer downstream. This will enable positive shutoff and a long

service life.

6.5 Ensure the disc (2) is in the closed position then carefully center the

valve between flanges. The valve guide holes (wafer pattern valve) or

tapped holes (lug pattern valve) should be used to align the valve with

the mating flanges.

6.6 Use flange gasket manufacturer’s recommended torques when bolting

valve into the line.

6.7 Gaskets should conform to the requirements of API Standard 601,

Edition 3 for ASME/ANSI B16.5 class flanges. Spiral wound gaskets,

such as Flexitallic CGl series, conforming to ASME/ANSI B16.20 are

acceptable.

McCANNALOK CRYOGENIC VALVE

Installation, Operation and Maintenance Manual

contained herein shall not be copied, transferred, conveyed, or displayed in any manner that would

violate its proprietary nature without the express written permission of Bray International, Inc.

8 of 18

7.0 MAINTENANCE

7.1 Reasonable precautions should be taken before beginning work on the

valve. Protective clothing, as required by the specific line fluid, should

be worn. If the valve was removed from cryogenic service, allow plenty

of time for it to warm up to a safe temperature.

WARNING

Before removing handle or the actuator from the valve, or before removing seat

retainer from a valve in dead end service, close the valve and depressurize the line.

7.2 The eccentric design of the McCannalok valve may allow line pressure

to open the valve if the handle/actuator is not in place while the valve is

under pressure.

WARNING

Do not pressurize the line without a handle or actuator on the valve.

7.3 The McCannalok valve must be in the closed position to be removed

from the line.

7.4 Begin all work on a valve that has been removed from service by

cleaning the valve, removing any grit or scale.

CAUTION

When handling the valve, care should be taken not to scratch the disc edge or seat.

7.5 Replacement seats, seals and other parts are available from authorized

distributors. Contact your distributor or sales representative for details

of price and delivery.

WARNING

Verify if the valves are required to be cleaned for oxygen service. Depending on

the application, the valves may need to be cleaned and assembled at a qualified

oxygen cleaning facility.

McCANNALOK CRYOGENIC VALVE

Installation, Operation and Maintenance Manual

contained herein shall not be copied, transferred, conveyed, or displayed in any manner that would

violate its proprietary nature without the express written permission of Bray International, Inc.

9 of 18

8.0 STEM SEAL REPLACEMENT

8.1 Refer to McCannalok Cryogenic parts diagram for parts identification.

NOTICE

Note actuation assembly position before removal.

8.2 For handle operated valves, remove handle assembly. Remove socket

head cap screws (25) and lock washers (24). Remove mounting bracket

(21). For actuated valves, unbolt mounting bracket (21) from bonnet

(33) and lift actuator assembly off stem (3).

8.3 Remove gland retainer nuts (20) and lock washers (19). Remove gland

retainer (18) anti-blowout retaining ring or split ring (17) (depending on

size), gland ring (16), and grounding washer (14).

CAUTION

When removing stem seals, care should be taken not to scratch stem (3) or

packing box bore.

8.4 Remove stem seals (13).

8.5 Do not remove thrust washer (12), unless further valve disassembly is

required.

8.6 Examine body packing box bore and stem (3), clean as necessary to

remove any corrosion or foreign matter before installing new seals.

8.7 Install new seals (13) in packing box one at a time. Stagger seal ring

joints 180° apart when installing. Tamp each ring to bottom before

installing next ring. Table 3 shows the correct number of stem seals to

install in each valve.

NOTICE

On the larger valves it will be necessary to compress each seal before adding the

next.

McCANNALOK CRYOGENIC VALVE

Installation, Operation and Maintenance Manual

contained herein shall not be copied, transferred, conveyed, or displayed in any manner that would

violate its proprietary nature without the express written permission of Bray International, Inc.

10 of 18

8.8 Install grounding washer (14) on top of the stem seals (13) with the tines

facing down.

8.9 Slide gland ring (16) over stem (3) on top of grounding washer (14).

Install anti-blowout retaining ring or split ring (17) (depending on valve

size). Slide gland retainer (18) over stem (3) and onto gland studs (15).

Place lock washers (19) and hex nuts (20) on studs (15) and tighten

finger tight.

8.10 Remount actuator assembly with lock washers (24) and mounting

bracket cap screws (25). Tighten mounting bracket cap screws (25) to

the correct torque per Table 6. If required, remount handle assembly.

Ensure handle or actuator is mounted in the original orientation.

8.11 Operate valve open and closed several times to check for binding and

to set the stem seals. Loosen gland nuts (20) and retighten to torque

value given in Table 4 .

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