Top Banner
LUBRICATED 3Z PLUG VALVES – PRESSURE BALANCED INSTALLATION, OPERATION AND IN-LINE MAINTENANCE MANUAL 3Z CORPORATION 254, SIHWA VENTURE-RO, SIHEUNG-SI, GYEONGGI-DO, SOUTH KOREA (TEL) +82.2.333.1212 (FAX) +82.2.333.4111 E-mail : [email protected] Web:http://www.3zvalve.com D 10/19' 15 Design Code 추가 Y.J.KANG H.J.SUL H.S.KIM C 06/15'15 주소지 변경 T.H.JUNG Y.J.KANG H.S.KIM B 09/12’12 내용 추가 K.H.KIM H.J.SUL H.S.KIM A 02/24’10 Sealant 주입시기 변경 K.H.KIM H.S.KIM S.K.KIM Rev Date Issue Pre Rev App
19

LUBRICATED 3Z PLUG VALVES – PRESSURE … Plug Valve Manual.pdf1 LUBRICATED 3Z PLUG VALVES – PRESSURE BALANCED INSTALLATION, OPERATION AND IN-LINE MAINTENANCE MANUAL 3Z CORPORATION

May 15, 2020

Download

Documents

dariahiddleston
Welcome message from author
This document is posted to help you gain knowledge. Please leave a comment to let me know what you think about it! Share it to your friends and learn new things together.
Transcript
Page 1: LUBRICATED 3Z PLUG VALVES – PRESSURE … Plug Valve Manual.pdf1 LUBRICATED 3Z PLUG VALVES – PRESSURE BALANCED INSTALLATION, OPERATION AND IN-LINE MAINTENANCE MANUAL 3Z CORPORATION

1

LUBRICATED 3Z PLUG VALVES – PRESSURE BALANCED

INSTALLATION, OPERATION AND

IN-LINE MAINTENANCE MANUAL

3Z CORPORATION 254, SIHWA VENTURE-RO, SIHEUNG-SI, GYEONGGI-DO, SOUTH KOREA (TEL) +82.2.333.1212 (FAX) +82.2.333.4111 E-mail : [email protected] Web:http://www.3zvalve.com

D 10/19' 15 Design Code 추가 Y.J.KANG H.J.SUL H.S.KIM

C 06/15'15 주소지 변경 T.H.JUNG Y.J.KANG H.S.KIM

B 09/12’12 내용 추가 K.H.KIM H.J.SUL H.S.KIM

A 02/24’10 Sealant 주입시기 변경 K.H.KIM H.S.KIM S.K.KIM

Rev Date Issue Pre Rev App

Page 2: LUBRICATED 3Z PLUG VALVES – PRESSURE … Plug Valve Manual.pdf1 LUBRICATED 3Z PLUG VALVES – PRESSURE BALANCED INSTALLATION, OPERATION AND IN-LINE MAINTENANCE MANUAL 3Z CORPORATION

INSTALLATION, OPERATION AND IN-LINE MAINTENANCE MANUAL

DOC.NO. 3ZQM-E-05 1/18

REV. NO. D

ISSUED OCT, 19, 2015

1

CONTENTS

0. PREFACE 2 Page

1. SPECIFICATION & AVAILABILITY

3 Page

2. STORAGE 5 Page

3. INSTALLATION

5 Page

4. OPERATION

7 Page

5. IN-LINE MAINTENANCE 9 Page

6. THE CAUTION CLAUSES TO USE THE TOOLS

FOR MAINTENANCE AND REPAIR

15 Page

7. IN CASE OF LIFTING UP OR PUTTING DOWN A

PLUG VALVE THE MIDDLE OF MAINTENANCE

AND REPAIR

16 Page

8. THE AFFIRMATION AFTER THE MAINTENANCE

AND REPAIR

16 Page

9. THE VALUE OF BOLT TORQUE

16 Page

10. EXPLODED VIEW OF 3Z LUBRICATED VALVE 17 Page

11. CUTTING VIEW OF 3Z LUBRICATED VALVE 18 Page

Page 3: LUBRICATED 3Z PLUG VALVES – PRESSURE … Plug Valve Manual.pdf1 LUBRICATED 3Z PLUG VALVES – PRESSURE BALANCED INSTALLATION, OPERATION AND IN-LINE MAINTENANCE MANUAL 3Z CORPORATION

INSTALLATION, OPERATION AND IN-LINE MAINTENANCE MANUAL

DOC.NO. 3ZQM-E-05 2/18

REV. NO. D

ISSUED OCT, 19, 2015

2

0. PREFACE.

A plug valve should be managed properly in the each stage of transportation, installation, operation, and

maintenance. Also, it depends on the managing status of a supervisor and a operator that the plug valve

might raise high efficiency or not.

If a worker is conscious of the safety with all his heart, an accident could be prevented completely. Please,

keep in your mind the guiding principle of this manual, and the damage of lives or equipments will be never

caused.

This manual show a person in charge the installation, operation, maintenance, and repairs for a plug valve

as well as some special subject for safety, which and practiced thoroughly.

However, it is impossible that this manual can cover all kinds of the unexpected accidents. Therefore, this

manual being applied substantially, it is essential to take proper measure that comes from the experience

and common idea the worker.

Safety is the best.

It is up to you.

Page 4: LUBRICATED 3Z PLUG VALVES – PRESSURE … Plug Valve Manual.pdf1 LUBRICATED 3Z PLUG VALVES – PRESSURE BALANCED INSTALLATION, OPERATION AND IN-LINE MAINTENANCE MANUAL 3Z CORPORATION

INSTALLATION, OPERATION AND IN-LINE MAINTENANCE MANUAL

DOC.NO. 3ZQM-E-05 3/18

REV. NO. D

ISSUED OCT, 19, 2015

3

1. SPECIFICATION & AVAILABILITY

1-1. Specification

Fig 125 325 625 925 1525 125FB 325FB 625FB

Rating 150 300 600 900 1500 150 300 600

Size 0.5” ~24” 0.5” ~24” 0.5” ~24” 0.5” ~24” 0.5” ~18” 0.5” ~16” 0.5” ~12” 0.5” ~12”

Size for CE 40 ~600 40 ~600 40 ~600 40 ~600 40 ~450 40 ~400 40 ~300 40 ~300

Temperature -46°C ~ 371 °C

Connection Flange,

SC Flange,

SC Flange, BW,SC

Flange, BW

Flange, BW

Flange, SC

Flange, SC

Flange, BW,SC

Design ASME B16.34, API 599, API 6D

Ent To End ASME B16.10

Dimension of Flange

ASME B16.05, ASME B16.11, ASME B16.25

1-2. Available Materials

Component Materials Operating Temperature (°C)

Body/Plug/Cover

ASME SA 216 WCB -29 ~ 425

ASME SA 216 WCC -29 ~ 425

ASME SA 351 CF3 -29 ~ 425

ASME SA 351 CF3M -29 ~ 450

ASME SA 351 CF8 -29 ~ 525

ASME SA 351 CF8M -29 ~ 525

ASME SA 351 CN7M -29 ~ 325

ASME SA 352 LCB -46 ~ 325

ASME SA 352 LCC -46 ~ 325

Sealant

Sealant A -29 ~ 204

Sealant B -29 ~ 232

Sealant C -29 ~ 260

Sealant D -29 ~ 371

Gasket Graphite -29 ~ 525

Page 5: LUBRICATED 3Z PLUG VALVES – PRESSURE … Plug Valve Manual.pdf1 LUBRICATED 3Z PLUG VALVES – PRESSURE BALANCED INSTALLATION, OPERATION AND IN-LINE MAINTENANCE MANUAL 3Z CORPORATION

INSTALLATION, OPERATION AND IN-LINE MAINTENANCE MANUAL

DOC.NO. 3ZQM-E-05 4/18

REV. NO. D

ISSUED OCT, 19, 2015

4

1-3.Materials of Construction (Standard)

Component Materials Specification

Body Carbon Steel ASME SA216 WCB

Plug Carbon Steel ASME SA 216 WCB

Cover Bolt Alloy Steel ASME SA193 B7

Sealant Sealant A -

Stem Alloy Steel ASME SA322 4140

Compensator Alloy Steel ASME SA322 4140

Diaphragm Stainless Steel AISI 316

Gasket Stainless Steel ASIS 304+Graphite

Thrust Button Alloy Steel ASME SA322 4140

Gland Stainless Steel ASIS 304+Graphite

Gland Packing Graphiet -

Stem Packing Injector Stainless Steel AISI 303

Sealant Injector Stainless Steel AISI 303

Pressure Button Alloy Steel ASME SA322 4140

Adjusting Bolt Alloy Steel ASME SA322 4140

Hub Stainless Steel ASME SA351 CF8

Name Plate Stainless Steel AISI 304

Hub Bolt Stainless Steel AISI 304

Handle Carbon Steel AISI 1045

Page 6: LUBRICATED 3Z PLUG VALVES – PRESSURE … Plug Valve Manual.pdf1 LUBRICATED 3Z PLUG VALVES – PRESSURE BALANCED INSTALLATION, OPERATION AND IN-LINE MAINTENANCE MANUAL 3Z CORPORATION

INSTALLATION, OPERATION AND IN-LINE MAINTENANCE MANUAL

DOC.NO. 3ZQM-E-05 5/18

REV. NO. D

ISSUED OCT, 19, 2015

5

2. STORAGE

1) Special care should be taken not to drop, throw down and drag the valves during transportation

and storage.

2) Valves should be in the open position until installations and operations are completed to prevent

any damages of the plug surfaces.

3) Valves shall not be stored under the temperatures of minus 10℃ and over the temperatures of

plus 40℃.

Avoid flame, fire or temperature, these could damage gasket or seal parts which

directly happen to leakage.

Dry out valve before cooling and painting of the valve body because humidity on

valve cause destruction of waterproof joint

4) Until the valves are installed, vinyl packing and flange covers should not be taken off to prevent

damages of the flanges surfaces and contamination with foreign material such as soil, dirt, chips,

oil, etc.

3. INSTALLATION

A. Preparation for installation

A plug valve being carried, a rope, wire, and shackle should be strong enough to sustain the total weight.

A plug valve should be installed with the firm pipe line.

Move the valves as close as possible to the installation site before removing packing and end protectors.

After removing packaging, clean end connections to remove any unwanted paint or rust inhibitor. Ensure

that the valve is fully open. Inspect the internal bore of the valve. If there is excess sealant visible

around the plug ports, this should be scraped out. If the valve has been in storage for over 12 months we

recommend that additional valve sealant be injected prior to operation.

Special care shall be taken for the unidirectional valves such as chlorine service valves and fire safe

valves. Install these valves according to the flow direction arrows stamped on bodies.

For special purpose valves such as oxygen service valves and chlorine service valves, install

according to the instructions on tag plates.

Check material grade on name plate or body to verify compatibility of fluids with the valve.

Page 7: LUBRICATED 3Z PLUG VALVES – PRESSURE … Plug Valve Manual.pdf1 LUBRICATED 3Z PLUG VALVES – PRESSURE BALANCED INSTALLATION, OPERATION AND IN-LINE MAINTENANCE MANUAL 3Z CORPORATION

INSTALLATION, OPERATION AND IN-LINE MAINTENANCE MANUAL

DOC.NO. 3ZQM-E-05 6/18

REV. NO. D

ISSUED OCT, 19, 2015

6

B. Installation Configuration

3Z lubricated plug valves have bi-directional sealing capabilities. Therefore, except on valves with two

different end connections or where there are space constrictions that dictate hand wheel position, the valves

can be installed in any position, horizontal, vertical or at any angle in between.

C. Lifting into Position

Valves should always be lifted using suitable mechanical

lifting equipment operated by trained personnel. Chains,

slings and other lifting equipment should be regularly

inspected. Do not lift valves using the sealant fittings, gear

unit, hand wheel or wrench. Chains or slings should be fixed

around the valve body.

D. Flanged Connections

Selection of gaskets and bolting is the customer responsibility

but as a minimum they should meet the requirements of ANSI B16.5. Flanges should be pulled together

evenly by tightening opposite pairs of bolts.

Poorly aligned pipe connections cause leakage, fissuring rupture during use

under pressure.

E. Welding Connections

For weld end valves, install the valves according to the following procedure.

During welding, turn the valve to the open position. (Handle in line with pipe)

These valves contain Sealant. The body center section adjacent to plug shall not be

exposed to temperatures exceeding 200℃. The body, near the weld area, may be

wrapped with wet rope packing or comparable material to assist in absorbing the heat

from welding.

F. Threaded Connections

As 3Z lubricated valves have steel bodies, pipe wrenches can safely be used to grip the valve body adjacent

to the connection, while tightening it. The threads are suitable for forming dry seals so the use of thread

sealants is at the customer discretion.

Page 8: LUBRICATED 3Z PLUG VALVES – PRESSURE … Plug Valve Manual.pdf1 LUBRICATED 3Z PLUG VALVES – PRESSURE BALANCED INSTALLATION, OPERATION AND IN-LINE MAINTENANCE MANUAL 3Z CORPORATION

INSTALLATION, OPERATION AND IN-LINE MAINTENANCE MANUAL

DOC.NO. 3ZQM-E-05 7/18

REV. NO. D

ISSUED OCT, 19, 2015

7

4. OPERATION

A. Principle

3Z lubricated valves are quarter turn valves, i.e. they have a 90-degree rotation of the plug in operating from

fully open to fully closed. This operation is always clockwise to close, when viewed from above the valve

stem. Maximum operating torque occurs during approximately the first 15 degrees of plug rotation when

opening the valve from the fully closed position. Past 15 degrees the down the line seal is broken and the

run torque drops to approximately 40% of the break torque, on a well-maintained valve.

B. Operating Wrench Operated Valves

Wrench operated valves have an arrow shaped position

indicator fitted over the stem. The plug port is aligned to the

arrow points in the direction. When the arrow points across

the line of the pipe, the valve is closed. The indicator

should not be removed as it also functions as the open and

close stop by coming into contact with the stop pin adjacent

to the stem.

NOTICE.1. Wrench operated valves should b operated

with the correct size of 3Z wrench. Do not force valves

that will not operate readily and use pipe wrenches to

operate 3Z plug valves.

C. Operating Gear Operated Valves

All worm gear operators used by 3Z have visible

arrow type position indicators on the top of the gear

housing. The position indicator arrow points to these at

the fully opened or closed positions.

NOTICE.2. Gear operators should be fitted with the

correct size of hand wheel as supplied by 3Z valves.

Gear operators are always clockwise to close and this

is indicated by the arrow on the close indicator in the

center of the hand wheel. The number of turns

required to open or close the valve varies with the gear

INDICATOR

GLAND

PLUG

INDICATOR GEAR BOX

Page 9: LUBRICATED 3Z PLUG VALVES – PRESSURE … Plug Valve Manual.pdf1 LUBRICATED 3Z PLUG VALVES – PRESSURE BALANCED INSTALLATION, OPERATION AND IN-LINE MAINTENANCE MANUAL 3Z CORPORATION

INSTALLATION, OPERATION AND IN-LINE MAINTENANCE MANUAL

DOC.NO. 3ZQM-E-05 8/18

REV. NO. D

ISSUED OCT, 19, 2015

8

operator fitted.

NOTICE.3. Valves that are installed in locations where unauthorized personnel can interfere with them

should normally have the wrench or hand wheel removed, be locked with suitable locking devices or be

chained through the hand wheel to prevent operation.

D. GENERAL NOTICE

1) No one may carry a plug valve except the practiced expert.

2) If a plug valve has a locking device, only the concerned operator or the supervisor should keep the key.

In case the device wants repairs, it should be done right away.

3) Never take away any attached tag or device from a plug valve nor any function could be removed at

discretion.

4) Whatever slight defect if detected in plug valve, the operation should be stopped.

5) The application terms must be observed; for example, the pressure limitation and the application for

material.

Check maximum working pressure for material as per ASME B16.34 on name plate

or marking on the body.

Check marking of maximum operation temperature on the name plate and material

grade on the valve body.

Do not use embossing stamps on the body which happen to weakness of the body

strength and then cause leakage or serious injury during use under pressure.

5) In accord with the manual, the inspection of the function should be carried out periodically any always

right before the operation of a plug valve.

Keep filtration of the fluid, internal wearing under the effect of an abrasive cause

leakage, fissuring rupture during use under pressure.

6) Never convert a plug valve

7) Should keep the forbidden clause in mind.

8) Should keep the safety regulation in mind.

Page 10: LUBRICATED 3Z PLUG VALVES – PRESSURE … Plug Valve Manual.pdf1 LUBRICATED 3Z PLUG VALVES – PRESSURE BALANCED INSTALLATION, OPERATION AND IN-LINE MAINTENANCE MANUAL 3Z CORPORATION

INSTALLATION, OPERATION AND IN-LINE MAINTENANCE MANUAL

DOC.NO. 3ZQM-E-05 9/18

REV. NO. D

ISSUED OCT, 19, 2015

9

5. IN-LINE MAINTENANCE

There are four maintenance operations that can be carried out on 3Z lubricated plug valves while in-line and

on service. With these operations, except in cases where the plug becomes heavily eroded, corroded or

damaged, 3Z valves can be fully maintained in-line for many years of trouble free service.

Do not disassembly parts or cover which related to pressure contain parts under

pressure.

5-1 Injection of Valve Sealant

The reason for injecting valve sealant onto the valve seats of 3Z lubricated plug valves is to maintain the

bubble tight shutoff capabilities and to ensure smooth operation of the valve.

EQUIPMENT NEEDED High Pressure Sealant Injection Gun with Pressure Gauge (cf; CLIMAX No. 10516-S)

Plug Valve Sealant (suitable for service)

A. Frequency of Sealant Injection (recommended)

To ensure maximum life and performance, occasional injection of plug lubricant is recommended. Periodic

lubrication is needed to keep low valve operating torque and to maintain bubble tight sealing.

Following lubrication schedule is recommended.

1) 10 to 100 operations per week : Daily

2) Up to 10 operations per week : Weekly

3) Up to 10 operations per year : Monthly

4) After a period of 12 months with valve kept in open/closed position : Yearly

All valves should be injected with appropriate sealant after installation.

If, at any time, there is a sign of leakage, plug sealant should be injected.

Page 11: LUBRICATED 3Z PLUG VALVES – PRESSURE … Plug Valve Manual.pdf1 LUBRICATED 3Z PLUG VALVES – PRESSURE BALANCED INSTALLATION, OPERATION AND IN-LINE MAINTENANCE MANUAL 3Z CORPORATION

INSTALLATION, OPERATION AND IN-LINE MAINTENANCE MANUAL

DOC.NO. 3ZQM-E-05 10/18

REV. NO. D

ISSUED OCT, 19, 2015

10

B. Sealant Injection Equipment

All 3Z lubricated plug valves are fitted with "Giant Button Head Sealant fittings, unless the customer

specifies special fittings such as sub-sea. To inject sealant into 3Z valves, a high pressure sealant gun with

a giant button head coupler is required. The gun should also have a pressure gauge reading to at least

10,000 psi.

NOTICE.4. Do not attempt to use low pressure lubricant guns on 3Z lubricated valve.

C. Valve Sealants & Lubricants

Only sealants recommended for use in TAPER plug valves should be used. 3Z can supply sealants

suitable for most services and there are other manufactures who also make good sealants. If you already

have a particular valve sealant in use at a facility, we will advise on the suitability of it for it's use in 3Z

lubricated plug valves, on a particular service.

NOTICE. 5. Do not use the following types of sealant : Sealant supplied by cylindrical/parallel plug valve

manufacturers, commercially available lubricating grease such as bearing grease, and sealants with high

levels of bentonite clay filler such as Rockwell/Nordstrom NO.555.

D. Injecting Sealant

The following instructions should be used in

conjunction with the sealant gun manufacturers

instructions. Sealant can be injected with the valve

in line and on pressure.

1) Plug Position

Page 12: LUBRICATED 3Z PLUG VALVES – PRESSURE … Plug Valve Manual.pdf1 LUBRICATED 3Z PLUG VALVES – PRESSURE BALANCED INSTALLATION, OPERATION AND IN-LINE MAINTENANCE MANUAL 3Z CORPORATION

INSTALLATION, OPERATION AND IN-LINE MAINTENANCE MANUAL

DOC.NO. 3ZQM-E-05 11/18

REV. NO. D

ISSUED OCT, 19, 2015

11

If possible the valve should be either fully opened or fully closed. This ensures that all four sealant

grooves on the plug are connected to the sealant supply. If the valve is partially open, injection is less

effective as only two of the grooves are connected to the supply.

2) Sealant Fitting

Identify and clean the giant button head fitting on the valve. In particular scrape off any paint build-up

away from the small hole in the end of the supply.

3) Fill the Gun

Ensure that the gun is filled and primed with a suitable plug valve sealant. Follow the gun manufacturers

instructions to fill the gun.

4) Attach the Gun

Slide the button head coupler on the end of the gun hose, over the valve gaint button

head fitting, ensuring that the lip of the coupler fits into the groove in the fitting. If

the gun has an isolating valve on the coupler or elsewhere, open this valve.

5) Start Pumping

Inject sealant either by pumping the handle on a manual gun or connecting the air supply to the pneumatic

gun. The pressure gauge needs to be monitored during the sealant injection process. For sealant to flow

onto the valve seats, enough sealant at sufficient pressure has first to be injected to overcome the line

pressure, to fill any cavities in the sealant chamber and grooves and to overcome the resistance to flow

through the valve sealant system.

Giant Button Head Fitting

Giant Button Head Coupler

Page 13: LUBRICATED 3Z PLUG VALVES – PRESSURE … Plug Valve Manual.pdf1 LUBRICATED 3Z PLUG VALVES – PRESSURE BALANCED INSTALLATION, OPERATION AND IN-LINE MAINTENANCE MANUAL 3Z CORPORATION

INSTALLATION, OPERATION AND IN-LINE MAINTENANCE MANUAL

DOC.NO. 3ZQM-E-05 12/18

REV. NO. D

ISSUED OCT, 19, 2015

12

Sealant is flowing onto the seats when the pressure gauge on the gun is significantly higher than the line

pressure and falls slowly. On low pressure 3Z or valves off pressure, a minimum of 2000 PSI sealant

pressure is needed to ensure proper injection of sealant onto the seats. With a valve that is regularly injected

with sealant, the sealant pressure will quickly build up. A valve that has not been well maintained could

require a significant amount of sealant to be injected before pressure builds up and sealant flows onto the

seats.

6) Disconnect

After sufficient sealant has been injected, relieve the internal pressure in the gun and disconnect it from the

giant button head fitting.

NOTICE.5. The lubricant gun should not be connected or disconnected while it has internal pressure.

5-2 STEM PACKING ADJUSTMENT

All 3Z lubricated plug valves are fitted with an emergency stem packing fitting. In the unlikely event of a

3Z lubricated valve developing a stem leak, this fitting can be used to inject stem packing into the stem area

and reseal the valve stem. This can safely be done with the valve under pressure.

NOTICE.6. Never attempt to replace the stem packing in bolted gland 3Z lubricated valves while under

pressure.

. When a plug valve is separated from the pipeline, after identifying that the pressure inside the connected

pipelines as well as the plug valve is removed completely, the instruction of the manual should be

observed.

. Upon getting rid or the pressure inside a plug valve, the signal

WARNING should be given on it.

. It is impossible that the fluid and pressure is resupplied in the

line, which have been separated once, without the permission

of either the concerned expert or the supervisor.

. If valve has been used on hazardous fluids, make certain it has

been thoroughly cleaned before disassembly.

. Should wear the safeguard during cleansing a plug valve.

EQUIPMENT NEEDED

Allen key wrench (to fit stem packing injector) or

Allen Head Needle Valve

Page 14: LUBRICATED 3Z PLUG VALVES – PRESSURE … Plug Valve Manual.pdf1 LUBRICATED 3Z PLUG VALVES – PRESSURE BALANCED INSTALLATION, OPERATION AND IN-LINE MAINTENANCE MANUAL 3Z CORPORATION

INSTALLATION, OPERATION AND IN-LINE MAINTENANCE MANUAL

DOC.NO. 3ZQM-E-05 13/18

REV. NO. D

ISSUED OCT, 19, 2015

13

High Pressure Stem Packing Injection Gun with Pressure release (CLIMAX NO. 10516).

Stem Sealing Compound for 3Z Lubricated Plug Valves.

The stem packing injector fitting consists of an outer hexagonal shaped casting, that is screwed into the

valve body. Inside it is a check valve and stem packing is forced through it with an allen head needle

valve that threads into the end of the casting. Stem packing injectors on 3Z lubricated plug valves are

preloaded at the factory with sufficient Stem Sealing Compound to reseal small leaks.

a. Injecting Stem Packing

To inject the stem sealing compound already in the fitting, into the valve

stem area, insert and Allen head wrench into the Allen head needle valve,

in the end of the stem packing injector and rotate it clock wise until it

becomes hard to turn. Normally only 1-3 turns will be possible. A

maximum torque of 10 foot pounds onto the Allen head wrench is all

that is required to sufficiently inject the stem packing. Or use high-

pressure stem packing injection gun with pressure release to inject stem

packing.

NOTICE.7. Operating the valve during the injection of stem sealing compound can assist in resealing the

valve stem.

b. Reloading the Stem Packing Injector

If the needle valve bottoms out inside of the stem packing injector and the stem is still leaking, more stem

packing needs to be loaded into the stem packing injector. This is done by backing out the needle valve,

putting in a new piece of stem sealing compound into the fitting and screwing the needle valve back in.

NOTICE. 8. Never unscrew the stem packing injector fitting out of the valve body while the valve is

under pressure.

5-3 ADJUSTMENT OF PLUG ADJUSTING BOLT

All 3Z lubricated plug valves have a plug-adjusting bolt that is present at the factory to position the tapered

plug in optimum contact with the tapered body, i.e. the valve will seal off bubble tight and be of benefit to

adjust the plug into or out of the body seat.

EQUIPMENT NEEDED

Adjusting crescent wrench.

Allen Head Needle Valve

Allen Head Wrench

Page 15: LUBRICATED 3Z PLUG VALVES – PRESSURE … Plug Valve Manual.pdf1 LUBRICATED 3Z PLUG VALVES – PRESSURE BALANCED INSTALLATION, OPERATION AND IN-LINE MAINTENANCE MANUAL 3Z CORPORATION

INSTALLATION, OPERATION AND IN-LINE MAINTENANCE MANUAL

DOC.NO. 3ZQM-E-05 14/18

REV. NO. D

ISSUED OCT, 19, 2015

14

Hammer & steel punch (to loosen cap over adjustment screw).

If a 3Z lubricated plug valve leaks across the seats even after

injection of sufficient sealant onto the valve seats and it is very

easy to operate, then the plug is probably out of adjustment (not

in close enough contact with the body seat) and needs to be

adjusted into the tapered body seat.

NOTICE.9. Damaged metal seats can also produce these

symptoms.

If a 3Z lubricated plug valve is very hard to operate, even after injection of sufficient sealant, then the plug

could be pushed too far into the tapered body seat and needs adjusting out a little.

NOTICE. 10. Solid from clay based lubricants (555 type) or from the line media (slurries, etc) can also

make the valve hard to turn.

A. Adjusting the Plug Adjusting Bolt

This operation can be carried out with the valve on pressure.

B. Expose the Adjusting Screw

First identify the lock nut that protects the plug-adjusting bolt. It is always located in the center of the

valve cover. Remove the lock nut by unscrewing it (counterclockwise viewed from below the valve).

C. Adjusting into the Tapered Seats

To adjust the plug into the body seat, use an adjustable crescent wrench to tighten the plug-adjusting bolt

until it becomes significantly harden to turn. It should take no more than one turn to tighten the plug-

adjusting bolt, unless the plug-adjusting bolt has been slackened off. Once the adjusting bolt feels tight

enough, back it off by 1/8th of a turn.

NOTICE.11. Do not over tighten the plug-adjusting bolt as this. Will jam the plug into the body seat.

After adjusting the plug-adjusting bolt, refit the lock nut but do not over tighten it.

D. Adjusting out of the Tapered Seats

To adjust a seized or hard turn plug out of the body taper, slacken off the plug adjusting bolt by 1/4 turn

then inject sealant into the valve and this should ease the plug out sufficiently to make it operate smoothly.

Adjusting Bolt

Lock BoltLock Nut

Page 16: LUBRICATED 3Z PLUG VALVES – PRESSURE … Plug Valve Manual.pdf1 LUBRICATED 3Z PLUG VALVES – PRESSURE BALANCED INSTALLATION, OPERATION AND IN-LINE MAINTENANCE MANUAL 3Z CORPORATION

INSTALLATION, OPERATION AND IN-LINE MAINTENANCE MANUAL

DOC.NO. 3ZQM-E-05 15/18

REV. NO. D

ISSUED OCT, 19, 2015

15

NOTICE. 12. Do not remove the plug-adjusting bolt from the valve cover. After adjusting the plug-

adjusting bolt, refit the lock nut but do not over tighten it.

5-4 RENEWING OF SEALING

Most plug valves are used in applications where the flow is always in one direction. As are primarily

downstream seating, it if follows that the down stream seat takes the burnt of the wear and tear form normal

usage. Typically the downstream face of the plug erodes first and caused leakage. There can be

instances where the downstream plug seat is eroded while the upstream plug seat is still in good condition.

In such cases, by rotating the plug through 180 degrees, the good condition plug seat becomes the

downstream seat and leakage will be stopped or substantially reduced, so extending the life of the valve.

This procedure should not be undertaken with product flowing through the valve.

6. THE CAUTION CLAUSES TO USE THE TOOLS FOR MAINTENANCE

AND REPAIR

Should use the proper tools for maintenance and repair, or a plug valve might be damaged by impact and

crack.

Do not weld or drill the valve body under pressure to attach parts or actuator support.

1) A screwdriver should not be used instead of a wedge, a chisel, a punch, and so on.

2) A screwdriver could never stand for wrench.

3) Should keep the sharp tools which is apt to be cut and injured in toolbox or tool-belt; keeping those tools

in the personal pocket should be banned.

4) All of tools like a connector, a rope, and a chain should be inspected before the use.

5) When the worker is injured in the middle of handiwork, the first aid should be given right away.

6) While grinding or drilling right beside a plug valve, watch out not to even a chip enter inner part of the

plug valve.

7) During the maintenance and repair, the handy tools or the equipments including a plug valve and a

scaffold should be straightened up in order well.

Page 17: LUBRICATED 3Z PLUG VALVES – PRESSURE … Plug Valve Manual.pdf1 LUBRICATED 3Z PLUG VALVES – PRESSURE BALANCED INSTALLATION, OPERATION AND IN-LINE MAINTENANCE MANUAL 3Z CORPORATION

INSTALLATION, OPERATION AND IN-LINE MAINTENANCE MANUAL

DOC.NO. 3ZQM-E-05 16/18

REV. NO. D

ISSUED OCT, 19, 2015

16

7. IN CASE OF LIFTING UP OR PUTTING DOWN A PLUG VALVE IN THE MIDDLE

OF MAINTENANCE AND REPAIR

1) When a plug valve is lifted up, with straightening your back and bending your keens, only the muscle of

legs must be used.

Don't lift it up by force with unbalanced and twisted stance.

2) Should wear a safe-shoes for the provision of the unforeseen accident like slipping or dropping in the

middle of conveyance.

3) Keep yourself out of the impact point that a plug valve is hung

4) Some equipment should be furnished to prevent wire rope from being twisted and keep a Crain or

anything form being overloaded.

8. THE AFFIRMATION AFTER THE MAINTENANCE AND REPAIR

1) Should identify if all factors are set up properly before the operation.

2) A test run being carried out, all tools and equipment should be kept away form the valve.

3) Never get into production until the safety of all functions is identified.

9. THE VALUE OF BOLT TORQUE

Bolt Size A193 B8 (N.M) A193 B7 (N.M)

M8 10 18

M10 21 36

M12 36 63

M16 78 137

M20 175 305

M24 302 526

M30 602 1,047

M36 1054 1,833

M42 1,689 2,936

Page 18: LUBRICATED 3Z PLUG VALVES – PRESSURE … Plug Valve Manual.pdf1 LUBRICATED 3Z PLUG VALVES – PRESSURE BALANCED INSTALLATION, OPERATION AND IN-LINE MAINTENANCE MANUAL 3Z CORPORATION

INSTALLATION, OPERATION AND IN-LINE MAINTENANCE MANUAL

DOC.NO. 3ZQM-E-05 17/18

REV. NO. D

ISSUED OCT, 19, 2015

17

10. EXPLODED VIEW OF 3Z LUBRICATED VALVE

Page 19: LUBRICATED 3Z PLUG VALVES – PRESSURE … Plug Valve Manual.pdf1 LUBRICATED 3Z PLUG VALVES – PRESSURE BALANCED INSTALLATION, OPERATION AND IN-LINE MAINTENANCE MANUAL 3Z CORPORATION

INSTALLATION, OPERATION AND IN-LINE MAINTENANCE MANUAL

DOC.NO. 3ZQM-E-05 18/18

REV. NO. D

ISSUED OCT, 19, 2015

18

11. CUTTING VIEW OF 3Z LUBRICATED VALVE