MSI LT User manual

Revision D April 03, 2014
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: [email protected]

MSI LT VALVE TECHNICAL MANUAL
Revision D April 03, 2014
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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

MSI LT VALVE TECHNICAL MANUAL
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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)

MSI LT VALVE TECHNICAL MANUAL
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1.1 SAFETAP™ GREASE FITTING
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.

MSI LT VALVE TECHNICAL MANUAL
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1.2 GREASEAL™ PLUG
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.

MSI LT VALVE TECHNICAL MANUAL
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2.0 EXPLODED VIEW

MSI LT VALVE TECHNICAL MANUAL
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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.