MSI LT Technical Manual

LT VALVE TECHNICAL MANUAL

MSI is a division of Dixie Iron Works, Ltd.

300 West Main St.

Alice, Texas 78332
Phone: [phone]
Phone: [phone]

Fax: [phone]

Email: [e-mail]

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MSI LT VALVE TECHNICAL MANUAL

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TABLE OF CONTENTS

1.0 FEATURES ............................................................................................................. 3

1.1 SAFE-TAP™ GREASE FITTING ............................................................... 4

1.2 GREASEAL™ PLUG ....................................................................................... 5

2.0 EXPLODED VIEW .............................................................................................. 6

2.1 PARTS LIST ...................................................................................................... 7

3.0 ASSEMBLY PROCEDURE – UNISERT™ TYPE ..................................... 8

3.1 ASSEMBLY PROCEDURE – UNISERT™ TYPE (TEXT) .............. 19

3.2 ASSEMBLY PROCEDURE – SPLIT INSERT TYPE ....................... 21

3.3 ASSEMBLY PROCEDURE – SPLIT INSERT TYPE (TEXT) ...... 31

4.0 EXPLODED VIEW (5 INCH ) ..................................................................... 33

4.1 PARTS LIST .................................................................................................... 34

5.0 ASSEMBLY PROCEDURE – UNISERT™ TYPE (5 INCH) ............ 35

5.1 ASSEMBLY PROCEDURE – UNISERT™ TYPE (5 INCH)

(TEXT) ....................................................................................................................... 44

5.2 ASSEMBLY PROCEDURE –SPLIT INSERT TYPE (5 INCH) ... 46

5.3 ASSEMBLY PROCEDURE –SPLIT INSERT TYPE (5 INCH)

(TEXT) ....................................................................................................................... 55

6.0 DISASSEMBLY PROCEDURE ..................................................................... 57

7.0 MAINTENANCE ................................................................................................. 58

8.0 REPAIR AND INSPECTION ........................................................................ 59

8.1 DISASSEMBLY TIPS .................................................................................. 61

8.2 SANDING TIPS ............................................................................................ 62

8.3 ASSEMBLY TIPS .......................................................................................... 63

9.0 STORAGE ............................................................................................................. 64

9.1 SHELF LIFE .................................................................................................... 65

10.0 ACCESSORIES ................................................................................................ 66

10.1 GREASES ....................................................................................................... 67

10.2 GREASE REQUIREMENTS .................................................................... 68

10.3 ACTUATORS ................................................................................................ 69

10.4 RUBBER PRODUCTS ............................................................................... 70

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1.0 FEATURES

The MSI LT Plug Valve is a lubricated, tapered pocket, quarter-turn plug valve
for rapid full open or close operation. The valve cavity is tapered to ensure uniform
seating of the sealing inserts, providing a reliable seal at the full range of pressures.
The MSI LT Plug Valve and replacement parts are engineered to provide low
operating toque and resistance to the toughest abrasive and corrosive conditions.

MSI offers more end connection choices than any other plug valve
manufacturer in the industry. Connection types such as Hammer Unions, Line Pipe,
API Flanged, Tool Joint, Clamp Hub, and our own metal-to-metal WingSeal (WS20
and WS30) are just a few of the available choices. All sizes of MSI valves can be
outfitted with your choice of end connections or combinations to suit your specific
application. Custom end-to-end lengths are also available on some valves.

 Compact Design
 Lightweight
 Longer lasting internals
 Ease of repair
 Interchangeability
 SafeTap™ grease fitting
 UNIsert™ integral insert
 GreaSeal™ plug for full 360° greasing
 Widest range of end connections in the industry

o Hammer union (all sizes of 602, 1002, 1502, 2002, 2202)
o API Flange & Studded (all sizes and working pressures)
o WingSeal 20 (2.00”ID) & 30 (3.00”ID) *metal-to-metal
o Clamp Hub (all sizes such as B20, GR14, GR31, plus API clamp hubs)
o Threaded Ends (all sizes of Line Pipe, EU, NU, and premium threads)
o Tool Joint (All sizes of IF and ACME unions)

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SafeTap™ grease fittings are designed to provide maximum safe operation in the
field. These fittings are standard in all new LT valves. Key features include:

 The unique metal-to-

metal seal eliminates
wetted threads and pipe
taps. Since the threads
do not perform a sealing
function they do not
require Teflon tape or
other sealing aids.

 The heavier cross section

stands up better to
impacts.

 Each fitting has a slot

machined through the
threads which serves as a
pressure relief path in the
event of a leak.

 The metal-to-metal seal and the pressure relief slot of the SafeTap™ grease

fitting also allow a means to safely bleed any residual internal pressure.

1.1 SAFETAP™ GREASE FITTING

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The patented GreaSeal™ plug is designed to provide maximum lubrication in the
harshest field conditions. Key features include:

 The only plug that

allows greasing in the
opened or closed
position while in
service.

 Dual 360°grease

channels.

 Forces grease into 360°

of the seal area when
closed.

 Allows for complete

distribution of lubricant
immediately prior to
opening a valve when
exposure to high
temperatures and well
fluids may have
compromised the
existing grease.

 Greasing in the closed

position can stop or
significantly slow leaks
in valves with worn or
damaged parts.

 Grease fitting installs

from the bottom of the
plug for added
protection from
impacts.

1.2 GREASEAL™ PLUG

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2.0 EXPLODED VIEW

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2.1 PARTS LIST

NO.

QTY REQ’D

DESCRIPTION

1 2 PLUG BOLT

2 2 WASHER (SMALL)

3 2 WASHER (LARGE)

4 1 HANDLE ADAPTER

5 1 STOP COLLAR

6 1 RESILIENT SEAL

7 1 SAFETAP™ GREASE FITTING

8 1 VALVE BODY

9 2 PLUG SEAL

10a

1

PLUG

10b

1

GreaSeal™ PLUG

11 2 INSERT O-RING

12a

1

UNIsert™

12b

1

INSERT SET (SPLIT)

13 1 ADJUSTING NUT O-RING

14 1 ADJUSTING NUT

15 2 ROLL PIN (OUTER) (LG)

16 2 ROLL PIN (INNER) (SM)

17 1 WING NUT

18 1 NUT RETAINER SET

19 1 SPIRAL RETAINER RING

20 1 STOP BOLT

MSI LT VALVE TECHNICAL MANUAL

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3.0 ASSEMBLY PROCEDURE – UNISERT™ TYPE

NOTE: It is imperative that the workstation being used to assemble the
valve be clean and free of anything that could possibly contaminate the
grease such as metal shavings, dirt, rust, old paint, etc. Do not sand or
deburr near the workstation.

o Check surfaces around the

valve bore inside the valve
pocket for sharp edges
that could cause cutting of
the insert o-rings. Then
screw the clean adjusting
nut (14) all the way into
the valve body to make
sure the threads are not
damaged.

o After inspection, remove

the adjusting nut (14),
grease the sealing groove
and install the adjusting
nut o ring (13) in the
groove.

o Check the roll pins (15 &

16) in the valve body by
gently sliding a UNIsert™
(12) into the valve. The

UNIsert™ (12) should
move freely up and down
the length of the roll pin
slots without interference.

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o Apply a thin film of

lubricant to the recess in
the valve body (8) and
install the plug seal (9)
with the metal back
towards the recess facing
away from the pressure.

o Apply a thin film of

lubricant to the recess in
the adjusting nut (14)
and install the plug seal
(9) with the metal back
towards the recess facing
away from the pressure.

o Check the plug (10)

outside diameter for
surface defects such as
scratches, dings, nicks, or
sharp edges that could
affect the sealing area.
See 8.2 SANDING TIPS
for repair.

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o Check the surface finish of

the UNIsert™ (12)
making sure it does not
have any scratches, dings,
nicks or sharp edges that
could also affect the
sealing area. See 8.2

SANDING TIPS for repair.

o Inspect the adjusting nut

o-ring (13) for any

possible non-conformity.

o Pack the adjusting nut

(14) plug seal (9) with

valve grease.

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o Place the UNIsert™ (12)

on the adjusting nut
(14).

o Apply a thin film of grease

to the entire O.D. of the
plug (10).

o Install the lower end of the

plug (10) (opposite the
hex) in the UNIsert™

(12) and adjusting nut
(14) and push down until

the plug shoulders on the
adjusting nut.

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o Place the insert o-rings

(11) in to the grooves on

the UNIsert™ (12) and
pack with grease to retain
the rings and thoroughly
grease the sealing
surfaces.

o Secure the plug (10) to

the adjusting nut (14)
with the plug bolt (1) and
two washers (2 & 3).

o Lubricate the valve pocket

with valve grease.

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o Apply thread compound

(Never-Seez) to the
adjusting nut threads and
adjusting nut sealing
surfaces.

o Support the valve so that

the plug (10) hex can
pass through
unobstructed.

o Install the plug (10),

UNIsert™ (12) and
adjusting nut (14)

assembly into the valve
body.

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o Screw in the adjusting nut

until proper alignment is
obtained between the
valve bore, the UNIsert™
and plug. Do not tighten
beyond proper alignment
as actuating an over
tightened valve could
damage internal parts. If
sight through the bore is
not possible, then screw in
the adjusting nut until ½
or no thread is visible.

o Apply thread compound

(never Seez) to the
threads on the SafeTap™

grease fitting (7).

NOTE: Do not use Teflon
tape on the grease fitting.

o Install SafeTap™ grease

fitting (7) and torque to

80 ft-lbs.

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o Place spiral retainer ring

(19) on male end (if

required).

o Then place wing nut (17)

on male end and install the
nut retainer set (18) (if
required).

o Secure the retainers with

spiral retainer ring (if
required)

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o Install stop bolt (20).

o Install stop collar (5).

NOTE: Valves with bores
smaller than 2” do not use
a stop collar, the detent is
integral to the handle
adapter.

o Install the handle

adapter (4).

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o Secure handle adapter (4) with the plug bolt (1) and washers (2 & 3).

o Remove excess grease from

valve bore.

o Inspect plug alignment and

adjust as necessary with
adjusting nut (14).

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o Grease the counter bore of the valve body female end and press the resilient

seal (19) lip end towards

the valve in until the lip on
the OD of the seal snaps
into the groove in the back
of the counter bore.

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3.1 ASSEMBLY PROCEDURE – UNISERT™ TYPE (TEXT)

NOTE: It is imperative that the workstation being used to assemble the
valve be clean and free of anything that could possibly contaminate the
grease such as metal shavings, dirt, rust, old paint, etc. Do not sand or
deburr near the workstation.

1. Check surfaces around the valve bore inside the valve pocket for sharp edges

that could cause cutting of the insert o-rings. Then screw the clean
adjusting nut (14) all the way into the valve body to make sure the threads
are not damaged.

2. After inspection, remove the adjusting nut (14), grease the sealing groove
and install the adjusting nut o ring (13) in the groove.

3. Check the roll pins (15 & 16) in the valve body by gently sliding a
UNIsert™ (12) into the valve. The UNIsert™ (12) should move freely up
and down the length of the roll pin slots without interference.

4. Apply a thin film of lubricant to the recess in the valve body (8) and install
the plug seal (9) with the metal back towards the recess facing away from
the pressure.

5. Apply a thin film of lubricant to the recess in the adjusting nut (14) and
install the plug seal (9) with the metal back towards the recess facing away
from the pressure.

6. Check the plug (10) outside diameter for surface defects such as scratches,
dings, nicks, or sharp edges that could affect the sealing area. See 8.2

SANDING TIPS for repair.

7. Check the surface finish of the UNIsert™ (12) making sure it does not have
any scratches, dings, nicks or sharp edges that could also affect the sealing
area. See 8.2 SANDING TIPS for repair.

8. Inspect the adjusting nut o-ring (13) for any possible non-conformity.

9. Pack the adjusting nut (14) plug seal (9) with valve grease.

10. Place the UNIsert™ (12) on the adjusting nut (14).

11. Apply a thin film of grease to the entire O.D. of the plug (10).

12. Install the lower end of the plug (10) (opposite the hex/keyway) in the
UNIsert™ (12) and adjusting nut (14) and push down until the plug
shoulders on the adjusting nut.

13. Place the insert o-rings (11) in to the grooves on the UNIsert™ (12) and
pack with grease to thoroughly grease the sealing surfaces.

14. Secure the plug (10) to the adjusting nut (14) with the plug bolt (1) and
two washers (2 & 3).

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15. Lubricate the valve pocket with valve grease.

16. Apply thread compound (Never-Seez) to the adjusting nut threads and
adjusting nut sealing surfaces.

17. Support the valve so that the plug (10) hex can pass through unobstructed.

18. Install the plug (10), UNIsert™ (12) and adjusting nut (14) assembly
into the valve body.

19. Screw in the adjusting nut until proper alignment is obtained between the
valve bore, the UNIsert™ and plug. Do not tighten beyond proper alignment
as actuating an over tightened valve could damage internal parts. If sight
through the bore is not possible, then screw in the adjusting nut until ½ or no
thread is visible.

20. Apply thread compound (Never-Seez) to the threads on the SafeTap™
grease fitting (7). NOTE: Do not use Teflon tape on the grease fitting.

21. Install SafeTap™ grease fitting (7) and torque to 80 ft-lbs.

22. Place spiral retainer ring (19) on male end (if required).

23. Then place wing nut (17) on male end and install the nut retainer set
(18) (if required).

24. Secure the retainers with spiral retainer ring (if required).

25. Install stop bolt (20).

26. Install stop collar (5). NOTE: Valves with bores smaller than 2” do not

use a stop collar, the detent is integral to the handle adapter.

27. Install the handle adapter (4).

28. Secure handle adapter (4) with the plug bolt (1) and washers (2 & 3).

29. Remove excess grease from valve bore.

30. Inspect plug alignment and adjust as necessary with adjusting nut (14).

31. Grease the counter bore of the valve body female end and press the resilient
seal (19) lip end towards the valve in until the lip on the OD of the seal
snaps into the groove in the back of the counter bore.

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3.2 ASSEMBLY PROCEDURE – SPLIT INSERT TYPE

NOTE: It is imperative that the workstation being used to assemble the
valve be clean and free of anything that could possibly contaminate the
grease such as metal shavings, dirt, rust, old paint, etc. Do not sand or
deburr near the workstation.

o Check surfaces around the

valve bore inside the valve
pocket for sharp edges that
could cause cutting of the
insert o-rings. Then screw
the clean adjusting nut
(14) all the way into the
valve body to make sure
the threads are not
damaged.

o After inspection, remove

the adjusting nut (14),
grease the sealing groove
and install the adjusting
nut o ring (13) in the
groove.

o Check the roll pins (15 &

16) in the valve body by

gently sliding a set of
inserts (12) into the
valve. The inserts (12)
should move freely up and
down the length of the roll
pin slots without
interference.

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