Lineseal® III - Mueller Co.

Parts & Repair
Manual
! WARNING
LINESEAL III ® 3”– 20”
LINESEAL XP ® 3”– 4”
LINESEAL XPII ® 3”– 20”
BURIED SERVICE BUTTERFLY VALVES
WITH BONDED SEAT
500 West Eldorado Street
Decatur, Illinois 62522
www.muellercompany.com
1. Read and follow instructions carefully. Proper training and periodic review regarding the use of this equipment is essential to prevent possible serious injury
and/or property damage. The instructions contained herein were developed for using this equipment on fittings of Mueller manufacturer only, and may not be
applicable for any other use.
2. Do not exceed the pressure ratings of any components or equipment. Exceeding the rated pressure may result in serious injury and/or property damage.
3. Safety goggles and other appropriate protective gear should be used. Failure to do so could result in serious injury.
4. Pressure test, check for and repair leaks in all fittings and components each time one is installed or any joint or connection is broken. Failure to find and
repair a leak from any source in the fittings, by-pass lines or equipment could result in an explosion and subsequent serious injury and/or property damage.
5. MUELLER ® Drilling Machines and Equipment have been carefully designed and engineered to work together as a unit. The use of equipment manufactured
by someone other than MUELLER Co. may cause excessive wear or a malfunction of the MUELLER machines.
All warranties, expressed or implied, for MUELLER Drilling Machines are rendered null and void if the machines are used with shell cutters or
equipment manufactured by someone other than MUELLER Co.
Form 11987 - Rev. 10/09 - 1M-1 Copyright 1998 - MUELLER Co. Printed in U.S.A.

2
INDEX
LINESEAL III ® 3” –20”
LINESEAL XP ® 3” –4”
LINESEAL XPII ® 3” –20”
BURIED SERVICE BUTTERFLY VALVES
WITH BONDED SEAT
GENERAL INFORMATION
Page
Recommendations for Extended Storage ...............3
Troubleshooting Guide .........................................4
Parts & Service Ordering Information
Maintenance Instructions.......................................5
BUTTERFLY VALVES
3” – 20” Rubber Seated
Bonded Seat and V-Type Packing ..........................6
Replacing V-Type Packing .....................................7
LINESEAL III Butterfly Valve Parts ............................8
LINESEAL XP & XPII Butterfly Valve Parts ................9
MANUAL VALVE ACTUATORS
MDT-2S Buried Service Actuator Parts...................10
MDT-3S, 4S Buried Service Actuator Parts .............11
www.muellercompany.com

Mueller ®
Storage Procedure
LINESEAL III ®
, XP ®
, and XPII ®
RECOMMENDATIONS FOR EXTENDED STORAGE
(6 Months or Longer):
Your Mueller ® Rubber Seated Valve has been designed
to provide many years of trouble-free service. A
reasonable amount of care should be exercised in
storing the valve to assure trouble-free service.
Following are precautions which should be followed
regarding storage.
OUTDOOR STORAGE:
1. All exposed rubber components shall be brush
coated with EP2 lithium grease for potable water
applications, to a thickness of 1-2 mils.
2. If valves will be stored in a high humidity or
corrosive environment, where bare iron or steel
flanges may rust, then flanges should be coated
with a rust preventative suitable for outdoor
exposure such as Rust-Veto by E.F. Houghton.
Clean surfaces and apply one uniform coat with a
dry rag or brush.
3. Valve flanges should be covered with full circle
panels of 1 /4” exterior grade plywood or tempered
hardboard. These covers shall be fastened to the
valve flanges.
4. Valve and operator assembly should be covered
with black plastic sheeting having a minimum
thickness of 4 mils.
5. Electric equipment must be stored off the ground
above possible water or snow level, in a position
similar to the intended mounting position, and be
covered with plastic sheeting having a minimum
thickness of 4 mils.
6. If the average mean temperatures fall below 60°F
and/or the relative humidity exceeds 50%, all
electrical control components and motor control
compartments with internal heaters must have the
heaters wired and operating. The wire entrance
points must be sealed against moisture. Desiccant
must be placed in those units that do not have
internal heaters.
BUTTERFLY VALVES WITH BONDED SEAT
7. All conduit openings shall be sealed with metal
threads pipe plugs to keep equipment free from
moisture and to protect threads of conduit
openings. All other openings normally sealed by
the mating mounting surfaces must be covered
and sealed.
INDOOR STORAGE:
Indoor storage will require Steps 1, 6, and 7 listed
under outdoor storage.
3

4
Mueller ®
Troubleshooting Guide
LINESEAL III ®
, XP ®
, and XPII ®
PROBLEM
Leakage between valve and
actuator
Bottom trunnion leaks
Valve leaks when closed
Chain wheel jams
Valve hard to operate
TROUBLESHOOTING GUIDE
Packing leak
CAUSES
Packing or gasket leak
Disc not fully closed or past
fully closed
Disc edge wear or damage
Rubber seat wear or damage
Poorly fitting chain
Foreign material in valve
Corroded actuator parts
Loose actuator
BUTTERFLY VALVES WITH BONDED SEAT
REMEDIES
First, cycle the valve several
times. This should adjust the
packing. If this fails, clean
packing bore and replace
packing.
First, cycle the valve several
times. This should adjust the
packing. If this fails, replace
bottom shaft packing.
Adjust actuator closed
position stop.
Disc must be returned to
the factory for repair.
Valve must be returned to
the factory for repair.
Replace with correct chain.
Remove obstructions.
Clean and grease actuator.
Apply loctite or Omni-fit
locking compound and
tighten bolts.

Mueller ®
LINESEAL III ®
, XP ®
, and XPII ®
Maintenance Instructions and Parts & Service
ANNUAL MAINTENANCE INSTRUCTIONS
BONDED SEAT BUTTERFLY VALVES FOR
STANDARD SERVICE:
1. Cycle valve to verify operation and no
interference in line.
2. Close valve and check for leakage. If leakage is
detected, check operator stops to verify that disc is
fully closed. If leakage persists, remove valve to
inspect seat. A damaged seat requires valve to be
returned to the factory for repair.
3. Check flange connections for leakage. Tighten
bolts accordingly.
4. Check top trunnion area for shaft leakage. If
leakage is detected, replace valve packing.
Note: 10” and larger valves have top and
bottom packing.
Note: Lubrication is not required.
BONDED SEAT BUTTERFLY VALVES FOR BURIED
SERVICE:
1. Cycle valve to verify operation and no interference
in line. Listen for leakage in closed position.
NOTE: Lubrication is not required.
MDT ACTUATOR FOR STANDARD SERVICE:
1. Verify that actuator is still bolted securely to the
valve trunnion or bonnet. If movement is
detected, remove actuator cover and tighten
mounting bolts.
2. If operation is difficult or gear box is noisy, remove
actuator cover to inspect link and lever mechanism
and lubricant. Clean actuator and replace grease
if it has separated or worn away.
3. Check pointer on top of actuator to see if it
properly indicated valve position.
MDT ACTUATOR FOR BURIED SERVICE:
No scheduled maintenance required.
BUTTERFLY VALVES WITH BONDED SEAT
Mueller products are designed for long life. No
spare parts are recommended or required for
normal operations; however, should a part ever
be found worn or broken, you can order
replacement parts.
HOW TO ORDER PARTS:
To obtain further information or to order parts for
the 24" - 48" MUELLER ® LINESEAL III ® or 24" - 48"
MUELLER ® LINESEAL XPII ® Butterfly Valve, contact
a local Mueller representative or customer service
for butterfly valves:
Henry Pratt Company
401 S. Highland Avenue
Aurora, IL 60506-5563
Attention: Parts Manager
Phone: (630) 844-4000 extension 4029
Fax: (630) 844-4191
E-mail: bfvparts@muellervalves.com
TO ORDER SERVICE:
Henry Pratt Company
401 S. Highland Avenue
Aurora, IL 60506-5563
Attention: Field Service Manager
Phone: (630) 844-4000 extension 4163
Fax: (630) 844-4160
E-mail: bfvservice@muellervalves.com
For the most prompt assistance, please be ready
to provide the following information before
speaking with a customer service representative:
1. Valve size and type
2. Serial number
3. Order number
This information can be found on the valve
nameplate or on the submittal drawings.
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6
Mueller ®
LINESEAL III ®
, XP ®
, and XPII ®
Bonded Seat and V-Type Packing
3”– 20” RUBBER SEAT BUTTERFLY VALVE
BONDED SEAT DESIGN**
Your Mueller Rubber Seat Butterfly Valve has been
designed to provide many years of useful service and,
while rugged in construction, a reasonable amount
of care should be exercised in handling and
installation to ensure the realization of its normally
long service life.
This valve is supplied with Nylon bearings which
should never be greased or oiled and which require
no further attention.
The rubber seat is firmly bonded to the valve body in
the factory and cannot be replaced in the field. In the
event a new rubber seat is required, the valve body
must be returned to the factory. (Contact Customer
Service for authorization and instructions.)
BUTTERFLY VALVES WITH BONDED SEAT
V-TYPE VALVE SHAFT PACKING
Your Mueller Rubber Seat Butterfly Valve is equipped
with a valve shaft packing gland located at the point
where the shaft extends through the valve body.
This packing gland is non-adjustable. It consists of a
set of V-type packing rings with the top and bottom
adapter ring held in place by the operator furnished
on the valve.
This wear compensating V-type packing has a long
service life, but should replacement be required, the
table below will assist you. It is important to obtain
replacement packing that conforms to the nominal
depth of the packing set as listed below. A deviation
will result in pressure that might prevent the packing
from functioning properly. Refer to the following for
the replacement procedure.
Nominal
Packing Packing Depth of
Valve Size Shaft Size Size Location Packing Set * No. of Rings
3”
4”
5”
1 /2”
5 /8”
3 /4”
6” 1”
8” 1 1 /8”
10” 1 3 /8”
12” 1 1 /2”
14” 1 3 /4”
16” 2”
18” 2 1 /4”
20” 2 1 /2”
*In addition, top and bottom adapter rings are required.
**Linseal XP Valves 3” and 4” only.
1 /4” Top Only
1 /4” Top Only
1 /4” Top Only
1 /4” Top Only
1 /4” Top Only
1 /4” Top and Bottom
1 /4” Top and Bottom
1 /4” Top and Bottom
1 /4” Top and Bottom
1 /4” Top and Bottom
1 /4” Top and Bottom
41 /64” 3
41 /64” 3
41 /64” 3
41 /64” 3
41 /64” 3
41 /64” 3
41 /64” 3
41 /64” 3
41 /64” 3
41 /64” 3
41 /64” 3
Material-
Top and Bottom Adapter: Cotton Duck impregnated with Neoprene and Vulcanized or Phenolic. V-Rings:
Homogenous Neoprene Ring

Mueller ®
Replacing V-Type Packing
REPLACING V-TYPE PACKING RUBBER SEAT
BUTTERFLY VALVES
Before commencing any work on the valve, with the
disc open, close the nearest upstream and
downstream valves (in that order), then be sure the
valve disc is in the CLOSED POSITION. This removes
line pressure from the disc and positions it so that it is
unlikely to move when the operator is removed.
1. Remove old packing. A bent steel hook rod or a
3” drywall screw will assist in this operation.
2. Apply EP2 lithium grease to the packing during
the assembly process which will aid in installation
and sealing of packing. Exercise extreme care in
placing ring in packing bore so as not to damage
the ring. The two sealing lips on the V-packing
should be pointed toward the valve disc (see
sketch below).
3. Reassemble operator to valve.
LINESEAL III ®
, XP ®
, and XPII ®
BUTTERFLY VALVES WITH BONDED SEAT
VALVE SHAFT
TOP ADAPTER
TOP TRUNNION
PACKING RINGS
BOTTOM ADAPTER
7

8
Mueller ®
LINESEAL III ®
, XP ®
, and XPII ®
Replacement Parts for Lineseal III
Item No.
1
2
3
4
5
6
7
8
9
10
11
12**
Description
Body
Disc*
Shaft
Squeeze Pin
Bearing
Packing
Key
Cover (10”-20” Valves)
Lockwasher
Cap screw
Seat
Exp. Plug (3”-8” Valves)
10” THRU 20”
LINESEAL III
VALVES
Parts - for Mueller Lineseal III Butterfly Valves, 3" - 20" Sizes,
150 PSI working pressure
*3”-6” discs are cast stainless steel ASTM A-351 Grade CF8M.
**This plug is for 3”-8” sizes only
BUTTERFLY VALVES WITH BONDED SEAT
3” AND 8”
LINESEAL III VALVES
Material
Cast Iron ASTM A-126 Class B
Cast Iron ASTM A-126 Class B with 316 Edge
Stainless Steel 18-8 Type 304 ASTM A-276
Stainless Steel 18-8 Type 304 ASTM A-276
Nylatron GS
Chevron V-Type
Carbon Steel C-1045
Cast Iron ASTM A-48 Class 40
Stainless Steel Type 304
Stainless Steel Type 304
Buna N
Stainless Steel 18-8 Type 304 ASTM A-276

Mueller ®
LINESEAL III ®
, XP ®
, and XPII ®
Replacement Parts for Lineseal XP and XPII
Item No.
1
2
3
4
5
6
7
8
9
10
11
13
Description
Body
Disc*
Shaft
Squeeze Pin
Bearing*
Packing
Key
Cover (10”-20” Valves)
Lockwasher
Cap screw
Seat
Plug (6” and 8” Valves)
10” thru 20”
LINESEAL XPII
3” and 4” XP
VALVES
Parts - for Mueller Lineseal XP 3” and 4” sizes and XPII
Butterfly Valves, 3" - 20" Sizes, 250 PSI working pressure
*3”-6” discs are cast stainless steel ASTM A-351 Grade CF8M.
BUTTERFLY VALVES WITH BONDED SEAT
3” thru 8”
LINESEAL XPII VALVES
Material
Ductile Iron ASTM A-536 (65-45-12)
Ductile Iron ASTM A-536 (65-45-12)
Stainless Steel ASTM A-564 Type 630 COND. H-1150
Stainless Steel ASTM A-564 Type 630 COND. H-1150
Teflon with Stainless Steel Backing
Chevron V-Type
Carbon Steel C-1045
Cast Iron ASTM A-48 Class 40
Stainless Steel Type 304
Stainless Steel Type 304
Buna N
Cast Iron Bearings are Nylatron GS
9

10
Mueller ®
LINESEAL III ®
, XP ®
, and XPII ®
Buried Service Actuator – MDT-2S Parts
Item No.
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
19
20
21
22
A
A
Description
Housing
Expansion Plug
Insert
O-Ring
O-Ring
Cap Screw
Shim
Bearing
Slider Nut
Slider Tube
Slider Block
Lever
Shaft
Groove Pin
Cover
Cap Screw
Gasket
O-Ring
Spring Pin
Nut
12
6
16
14
9
15
10
8
7
13
19
Material
Cast Iron ASTM A-126 Class B
Stainless Steel Type 304
Noryl Grade GFN3-780
Buna N
Buna N
Alloy Steel
Hardened Steel
Sintered Iron
Ductile Iron ASTM A-536 Grade 80-60-03
Carbon Steel
Suitered Iron ASTM B-439 GR3
Ductile Iron ASTM A-536 Grade (65-45-12)
Carbon Steel (Stress Proof)
Alloy Steel
Cast Iron ASTM A-126 Class B
Stainless Steel Type 304
Blended Fiber, Cured Nitrite Binder
Buna N
Stainless Steel Type 420
Cast Iron ASTM A-126 Class B
8
BUTTERFLY VALVES WITH BONDED SEAT
20
21
4
3
5
1
11
14
7
2
22

18
10
23
Mueller ®
LINESEAL III ®
, XP ®
, and XPII ®
Buried Service Actuator – MDT-3S & MDT-4S Parts
A
A
Item No.
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
26
15
Description
Housing
Expansion Plug
Insert
O-Ring
O-Ring
Cap Screw
Lever
Bearing
Link
Set Screw
Retaining Ring
Slider Tube
Eccentric Bearing
Cover
Cap Screw
Shim
Thrust Washer
Thrust Collar
Drive Pin
Slider Nut
Bearing
Bearing
Shaft
Gasket
O-Ring
Nut
Pin
Flange Bearing
27
7
6
MDT-3S
ONLY
25 26
16
17
13
12
20
8
11
9
28
14
15
24
BUTTERFLY VALVES WITH BONDED SEAT
SECTION A-A
27 17 22
Material
Cast Iron ASTM A-126 Class B
Stainless Steel Type 304
Noryl Grade GFN3-780
Buna N
Buna N
Alloy Steel (Zinc Plated)
Ductile Iron ASTM A-536 Grade (65-45-12)
Sintered Bronze
Carbon Steel
Alloy Steel
Carbon Steel
Carbon Steel
Sintered Iron
Cast Iron ASTM A-126 Class B
Stainless Steel Type 304
Carbon Steel
Sintered Bronze (MTD-4S)/Iron (MDT-3S)
Carbon Steel
Alloy Steel
Ductile Iron ASTM A-536 (65-45-12)
Nylon (MDT-4S only)
Sintered Bronze
Carbon Steel
Blended Fiber, Cured Nitrite Binder
Buna N
Cast Iron ASTM A-48 Class 40 (MTD-4S)/ASTM A-126 Class B (MDT-3S)
Stainless Steel Type 304
Sintered Iron
2
19
13
12
8
11
9
4
3
5
1
19
21
MDT-3S
ONLY
MDT-4S
ONLY
11