Baker Hughes Masoneilan LincolnLog 78400/18400 Series User manual

78400/18400 Series
LincolnLog™High Pressure Anti-Cavitation
Control Valve
Instruction Manual (Rev. E)
Baker Hughes Data Classication : Public

b | Baker Hughes Copyright 2023 Baker Hughes Company. All rights reserved.
THESE INSTRUCTIONS PROVIDE THE CUSTOMER/OPERATOR WITH IMPORTANT PROJECT-
SPECIFIC REFERENCE INFORMATION IN ADDITION TO THE CUSTOMER/OPERATOR’S
NORMAL OPERATION AND MAINTENANCE PROCEDURES. SINCE OPERATION AND
MAINTENANCE PHILOSOPHIES VARY, BAKER HUGHES (AND ITS SUBSIDIARIES AND
AFFILIATES) DOES NOT ATTEMPT TO DICTATE SPECIFIC PROCEDURES, BUT TO PROVIDE
BASIC LIMITATIONS AND REQUIREMENTS CREATED BY THE TYPE OF EQUIPMENT
PROVIDED.
THESE INSTRUCTIONS ASSUME THAT OPERATORS ALREADY HAVE A GENERAL
UNDERSTANDING OF THE REQUIREMENTS FOR SAFE OPERATION OF MECHANICAL AND
ELECTRICAL EQUIPMENT IN POTENTIALLY HAZARDOUS ENVIRONMENTS. THEREFORE,
THESE INSTRUCTIONS SHOULD BE INTERPRETED AND APPLIED IN CONJUNCTION WITH
THE SAFETY RULES AND REGULATIONS APPLICABLE AT THE SITE AND THE PARTICULAR
REQUIREMENTS FOR OPERATION OF OTHER EQUIPMENT AT THE SITE.
THESE INSTRUCTIONS DO NOT PURPORT TO COVER ALL DETAILS OR VARIATIONS IN
EQUIPMENT NOR TO PROVIDE FOR EVERY POSSIBLE CONTINGENCY TO BE MET IN
CONNECTION WITH INSTALLATION, OPERATION OR MAINTENANCE. SHOULD FURTHER
INFORMATION BE DESIRED OR SHOULD PARTICULAR PROBLEMS ARISE WHICH ARE NOT
COVERED SUFFICIENTLY FOR THE CUSTOMER/OPERATOR'S PURPOSES THE MATTER
SHOULD BE REFERRED TO BAKER HUGHES.
THE RIGHTS, OBLIGATIONS AND LIABILITIES OF BAKER HUGHES AND THE CUSTOMER/
OPERATOR ARE STRICTLY LIMITED TO THOSE EXPRESSLY PROVIDED IN THE CONTRACT
RELATING TO THE SUPPLY OF THE EQUIPMENT. NO ADDITIONAL REPRESENTATIONS OR
WARRANTIES BY BAKER HUGHES REGARDING THE EQUIPMENT OR ITS USE ARE GIVEN
OR IMPLIED BY THE ISSUE OF THESE INSTRUCTIONS.
THESE INSTRUCTIONS ARE FURNISHED TO THE CUSTOMER/OPERATOR SOLELY TO
ASSIST IN THE INSTALLATION, TESTING, OPERATION, AND/OR MAINTENANCE OF THE
EQUIPMENT DESCRIBED. THIS DOCUMENT SHALL NOT BE REPRODUCED IN WHOLE OR IN
PART WITHOUT THE WRITTEN APPROVAL OF BAKER HUGHES.

Masoneilan 78400/18400 Series LincolnLog Valve Instruction Manual | cCopyright 2023 Baker Hughes Company. All rights reserved.
Table Of Contents
Safety Information.....................................................................................................................1
About this Manual ..................................................................................................................1
Warranty.................................................................................................................................1
Introduction................................................................................................................................2
Scope ....................................................................................................................................2
Serial Plate.............................................................................................................................2
After Sales Service.................................................................................................................2
Spare Parts ............................................................................................................................2
Actuator and Accessories.......................................................................................................2
Numbering System....................................................................................................................2
Unpacking ..................................................................................................................................3
Installation..................................................................................................................................3
Recommended Installation.....................................................................................................3
Piping Cleanliness .................................................................................................................3
Isolation Bypass Valve ...........................................................................................................3
Heat Insulation ......................................................................................................................3
Hydrostatic Testing and Line Cleaning...................................................................................3
Flow Direction ........................................................................................................................3
Welded Connections ..............................................................................................................3
Pre-Weld Preparation .......................................................................................................3
Welding Process...............................................................................................................3
Post Weld Cleaning & Assembly ......................................................................................3
Actuator Assembly .................................................................................................................4
Disassembly...............................................................................................................................4
Valve Actuation.......................................................................................................................4
Disconnect Instrumentation....................................................................................................4
Air-to-Retract Actuators .........................................................................................................4
Threaded Connection ......................................................................................................4
Stem Connector ...............................................................................................................4

d | Baker Hughes Copyright 2023 Baker Hughes Company. All rights reserved.
Air-to-Extend Actuators ..........................................................................................................4
Actuator Removal...................................................................................................................4
Valve Disassembly .................................................................................................................4
Maintenance & Repair...............................................................................................................5
Packing Box ...........................................................................................................................5
Packing Replacement ............................................................................................................5
Parts Repair ..........................................................................................................................6
Guiding Surfaces ..............................................................................................................6
Seating Surfaces ..............................................................................................................6
Seat Lapping.....................................................................................................................6
Soft Seat Repair ...............................................................................................................7
Gaskets.............................................................................................................................7
Metal Seal.........................................................................................................................7
Valve Plug and Stem ........................................................................................................7
Plug Removal ...................................................................................................................7
Valve Reassembly .....................................................................................................................7
Plug Stem Assembly .............................................................................................................7
Assembly Alignment .........................................................................................................8
Valve Reassembly .................................................................................................................8
Valve Sizes 1" and 1-1/2" Sizes........................................................................................8
Valve Sizes 2" to 8" Sizes.................................................................................................8
Body Bolting......................................................................................................................9
Packing Box Assembly .....................................................................................................9
Low Emissions LE™ Packing (Optional) ..........................................................................10
Preparation .......................................................................................................................10
Packing Box......................................................................................................................10
Packaging.........................................................................................................................11
Spring Loaded Follower....................................................................................................11
Packing Installation...........................................................................................................11
Valve Travel Requirements ....................................................................................................11

Masoneilan 78400/18400 Series LincolnLog Valve Instruction Manual | eCopyright 2023 Baker Hughes Company. All rights reserved.
Parts References .......................................................................................................................12
Actuation....................................................................................................................................16
Type 87/88 Multi-Spring Diaphragm Actuators.......................................................................17
Parts Reference Table 87/88 Actuators..................................................................................18
Type 51/52/53 Cylinder Actuators ..........................................................................................20
Connecting Double Acting (Model 51) ..............................................................................20
Connecting Air to Extend (Model 52)................................................................................20
Connecting Air to Retract (Model 53)................................................................................20
Parts Reference Table 51/52/53 Actuators.............................................................................26

1 | Baker Hughes Copyright 2023 Baker Hughes Company. All rights reserved.
Safety Information
Important - Please read before installation
These instructions contain DANGER, WARNING, and CAUTION
labels, where necessary, to alert you to safety related or other
important information. Read the instructions carefully before
installing and maintaining your control valve. DANGER and
WARNING hazards are related to personal injury. CAUTION
hazards involve equipment or property damage. Operation of
damaged equipment can, under certain operational conditions,
result in degraded process system performance that can
lead to injury or death. Total compliance with all DANGER,
WARNING, and CAUTION notices is required for safe operation.
This is the safety alert symbol. It alerts you to potential personal
injury hazards. Obey all safety messages that follow this symbol to
avoid possible injury or death.
Indicates a potentially hazardous situation which, if not avoided,
could result in death or serious injury.
Indicates a potentially hazardous situation which, if not avoided,
could result in serious injury.
Indicates a potentially hazardous situation which, if not avoided,
could result in minor or moderate injury.
When used without the safety alert symbol, indicates a potentially
hazardous situation which, if not avoided, could result in property
damage.
Note: Indicates important facts and conditions.
About this Manual
• The information in this manual is subject to change without
prior notice.
• The information contained in this manual, in whole or part,
shall not be transcribed or copied without Baker Hughes’s
written permission.
• Please report any errors or questions about the information in
this manual to your local supplier.
• These instructions are written specifically for the 78400/18400
LincolnLog control valves, and do not apply for other valves
outside of this product line.
Useful Life Period
The current estimated useful life period for the 78400/18400
LincolnLog control valves is 25+ years. To maximize the useful
life of the product, it is essential to conduct annual inspections,
routine maintenance and ensure proper installation to avoid
any unintended stresses on the product. The specific operating
conditions will also impact the useful life of the product. Consult
the factory for guidance on specific applications if required prior to
installation.
Warranty
Items sold by Baker Hughes are warranted to be free from defects
in materials and workmanship for a period of one year from the
date of shipment provided said items are used according to Baker
Hughes recommended usages. Baker Hughes reserves the right
to discontinue manufacture of any product or change product
materials, design or specifications without notice.
Note: Prior to installation:
• The valve must be installed, put into service and maintained by
qualified and competent professionals who have undergone
suitable training.
• All surrounding pipe lines must be thoroughly flushed to ensure
all entrained debris has been removed from the system.
• Under certain operating conditions, the use of damaged
equipment could cause a degradation of the performance of
the system which may lead to personal injury or death.
• Changes to specifications, structure, and components used
may not lead to the revision of this manual unless such
changes affect the function and performance of the product

Masoneilan 78400/18400 Series LincolnLog Valve Instruction Manual | 2Copyright 2023 Baker Hughes Company. All rights reserved.
Introduction
Scope
The following instructions are designed to guide the user through
the installation and maintenance of the Masoneilan™78400/18400
Series control valves.
The Masoneilan 78400/18400 Series control valve is part of
Masoneilan’s Engineered Product portfolio, and is custom designed
to fit our customer’s most difficult applications. This document
provides detailed installation and maintenance instructions for all
sizes, ratings and trim types used in the LincolnLog product line.
Serial Plate
The serial plate is usually fixed to the side of the actuator yoke.
It indicates information about the valve including size and type,
pressure class rating, body/bonnet material, and serial number.
After Sales Service
Baker Hughes offers After Sales Service comprised of highly
qualified technicians to support the installation operation,
maintenance and repair of its Masoneilan equipment. For support
contact the local Baker Hughes representative or Masoneilan
factory located closest to you.
Spare Parts
Only Masoneilan replacement parts should be used when
carrying out maintenance operations. Obtain replacement parts
through local Baker Hughes representatives or Masoneilan Parts
Department.
When ordering spare parts, the model and serial numbers indicated
on the manufacturer’s serial plate must be given.
Actuator and Accessories
Actuators and other valve accessories have their own instruction
manuals, that provide information and details on the assembly and
installation. Refer to the appropriate instruction manual for each
unique accessory.
* Additional stages are available to meet specific operating conditions.
Please consult Baker Hughes.
2nd
8
5th4th3rd
4
2nd
1st 1st 6th
4 Axial Flow High
Resistance
(Downseating)
Trim Type
Body Series
1 Globe
7 Angle
Optional
Configuration
F Forged Body
Design
EB Extension
Bonnet
0 Optional Trim
1 Trim A, Balanced
Hard Seat
2 Trim B, Balanced
Hard Seat
3 Trim C, Balanced
Hard Seat
4 Trim A, Balanced
Soft Seat
5 Trim B, Balanced
Soft Seat
6 Trim C, Balanced
Soft Seat
7 Trim A, Unbalanced
Hard Seat
8 Trim B, Unbalanced
Hard Seat
9 Trim C, Unbalanced
Hard Seat
Trim Size
3 Three
4 Four
6 Six
No. of
Stages*
Actuator Type
87 Spring-Diaphragm
Air to Close
88 Spring-Diaphragm
Air to Open
51 CylinderDouble
Acting
52 Cylinder Spring
Return (Air To
Extend)
53 Cylinder Spring
Return (Air To
Retract)
20 Top Mounted
Manual Handwheel
Numbering System

3 | Baker Hughes Copyright 2023 Baker Hughes Company. All rights reserved.
Unpacking
Care must be exercised when unpacking the valve to prevent
damage to the accessories and component parts. Contact the local
Baker Hughes Sales Office or Service Center with any issues or
problems. Be sure to note the Masoneilan valve model number and
serial number in all correspondences.
Installation
The 78400/18400 Series valve must always be installed
with the ow tending to open the valve plug. For appli-
cations where insulation of the valve body is required,
do not insulate the valve bonnet.
Recommended Installation
It is recommended to install the 78400/18400 Series valves in the
vertical position with the actuator extended up whenever possible.
This orientation eliminates the need for additional pipe support,
reduces the side load friction on the actuator, and provides ease of
removal of the trim during maintenance for weld-end construction
designs.
Piping Cleanliness
Before installing the valve in the line, clean piping and valve of all
foreign material such as welding chips, scale, oil, grease or dirt.
Gasket mating surfaces must be thoroughly cleaned to ensure
leak-free joints. Sacrificial start-up fixtures can be purchased from
Baker Hughes to protect the operational trim during the installation
and line flushing phases.
If major system or piping modications (or repairs) are
performed, thorough ushing and blowdown of the sys-
tem will be required prior to reinstalling the LincolnLog
trim. Sacricial ushing trim should be installed in the
valve to protect the integrity of the ow passages. Failure
to follow this warning will violate the valve warranty
agreement and could result in control instability, exces-
sive noise levels, and valve leakage.
Isolation Bypass Valve
To allow for in-line inspection, maintenance and removal of the
valve without service interruption, provide a manually operated
shutoff valve on each side of the control valve and a manually
operated throttling valve in the bypass line.
Heat Insulation
In case of a heat-insulated installation, do not insulate the valve
bonnet and take protective measures relative to personal safety.
Hydrostatic Testing and Line Cleaning
During this operation, the control valve must not be used as an
isolating valve. This means that the valve must always be opened
before carrying out pressure tests in the process line, cleaning
of pipes, etc. Otherwise equipment damage or failure of the seal
rings could result. If the value is to remain installed during line
cleaning, flushing trim MUST be installed to prevent damage to
trim components..
Flow Direction
The valve must be installed so that the process fluid will flow through
the valve in the direction indicated by the flow arrow located on the
body.
Welded Connections
Carefully review the information in this section prior to
welding any valves inline. Refer any additional ques-
tions to the local Baker Hughes Sales O󰀩ce or Service
Center.
Pre-Weld Preparation
Carefully follow the installation steps defined in the sections noted
above prior to performing weld procedures.
Welding Process
Perform welding process in accordance with the standard
requirements for the materials and weld construction of the specific
valve. Apply post weld heat treatment if required.
Internal valve components should be removed prior
to performing welding or pre/post weld heat treatment
in order to prevent damaging any soft goods (such
as PTFE seals). If unable to remove the elastomeric
components, then other methods must be employed
to prevent the local temperature around the seals from
exceeding the maximum material limits (typically 450°F /
232°C for PTFE-based materials).
Post Weld Cleaning & Assembly
Inspect the body, bonnet, and trim components for cleanliness and
surface condition. Remove any foreign materials, such as weld
chips, slag or scale. Make sure there are no nicks, scratches, burrs
or sharp corners on sealing and sliding surfaces. Clean all gasket
interface surfaces and reassemble using new gaskets to ensure
sealing integrity.
Actuator Assembly
Assemble the actuator onto the control valve using the appropriate
instructions for the specific actuator model and type. Connect air
pressure lines to the actuator ports to meet intended operating
mode (i.e., air-to-extend, air-to-retract, or double-acting).

Masoneilan 78400/18400 Series LincolnLog Valve Instruction Manual | 4Copyright 2023 Baker Hughes Company. All rights reserved.
Disassembly
Prior to performing any maintenance on the valve, iso-
late the valve and vent the process pressure.
Valve Actuation
Access to the internal components of the valve should be
accomplished with the actuator removed. Follow the detailed
instructions below and refer to the appropriate actuator instruction
manuals.
Actuator may be pre-loaded with tension from air pres-
sure or springs. Prior to disconnecting instrumentation
read all instructions for the specic actuator.
Disconnect Instrumentation
Disconnect all mechanical connections between the positioner and
the other instruments. Disassemble the valve stem and actuator
stem coupling as described in the following sections.
Air-to-Retract Actuators
Apply sufficient air pressure to the actuator to retract the stem
completely. Disconnect the plug stem from the actuator stem
depending on the connection type as described below.
Threaded Connection
Unscrew the plug stem from the actuator stem, making sure the
plug never contacts the seating area (liner or seat ring) at any time
during disassembly.
Contact between the plug and seating area during this
disassembly process may cause damage to the seating
surfaces. It may be necessary to disassemble the actua-
tor yoke from the valve bonnet and lifting the actuator
o󰀨 the valve to avoid plug to seating surface contact.
Stem Connector
Remove the screws and disassemble the stem connector from the
valve and actuator stems.
Air-to-Extend Actuators
For this actuator configuration, the valve plug is already in the fully
retracted position without any air pressure applied. Disconnect
the plug stem and actuator stem as described in the threaded
connection and stem connector sections above depending on the
connection type.
Actuator Removal
Disconnect all electrical and air connections to and from the actuator.
Disassemble yoke nut or yoke attachment screws, and lift the actuator
off of the valve being careful not to damage the bonnet threads.
Valve Disassembly
The valve must always be reassembled with new packing set and
gaskets. Before disassembly, make sure the recommended spare
parts are available for reassembly.
1. Disconnect the piping to the leak detector connection on the
bonnet (if applicable).
2. Remove the body stud nuts (7).
Note: For valve sizes 1" through 2", the bonnet (23) is a
one-piece construction. Valve sizes 3" and larger have
a bonnet (23) with a separate bonnet flange (24). These
larger sizes also use a metal seal (10) and multiple seat
ring gaskets (11) at various locations.
For valve sizes 1" through 2" follow disassembly instructions 3-10:
3. Disassemble the bonnet (23) and plug (20) / stem (21)
subassembly from the valve body as a single unit.
4. Remove the packing flange nuts (2), packing flange (3), and
the packing follower (4).
5. Remove the plug (20) and stem (21) subassembly from the
valve bonnet (23).
Be careful not to damage the plug (20) or liner (18) while
removing the plug/stem subassembly.
6. Remove the old packing set (22) and lantern ring (17).
Note: Applicable only for units with the optional leak
detector bonnet option.
7. Remove the body gasket (10), liner (18), and seat ring (19)
from the body.
Note: Valve sizes 1" and 1.5" have integral seat rings in
the liners.
8. Remove the retainer (8), seal ring, and back-up rings (9) from
the liner.
Note: The retainer, seal ring and back-up rings are only
used in the balanced valve assemblies.
9. Remove the seat ring gasket (11).
Note: 2" size valves have multiple seat ring gaskets.
10. Inspect the bonnet (23), plug (20) and stem (21) assembly,
liner (18), seat ring (19), and body (25) for any visual defects
or damage. Carefully inspect the dynamic sliding surfaces and
the seal interface areas.
For valve sizes 3" and larger follow disassembly instructions
11-19:
11. Disassemble the bonnet flange (24) and metal seal (10) from
the valve.
Note: The metal seal (10) will require some force to
remove from the valve. Using a common tool, such as an
open-end wrench, lever the seal up at various points to lift
out evenly.
12. Remove the bonnet (23) and plug (20) / stem (21) subassembly
from the valve body as a single unit.
13. Remove the packing flange nuts (2), packing flange (3), and
the packing follower (4).

5 | Baker Hughes Copyright 2023 Baker Hughes Company. All rights reserved.
Packing Replacement
Disassembly of the valve bonnet from the body is recommended
before replacing the standard PTFE V-Ring packing. Other packing
types can be replaced without removal of the bonnet. Use the
following procedures to replace existing packing:
1. Loosen and remove the packing flange nuts (2).
2. Remove the packing flange (3) and packing follower (4).
3. Remove the old packing set (22) and lantern ring (17).
Note: Applicable only for units with the optional leak
detector bonnet option.
4. Replace packing (22) referring to Figures 8, 9, or 10 for correct
number of packing rings.
Note: For PTFE packing, assemble new packing with the
cuts in the rings located 120° apart from the adjacent ring.
Press rings into the packing box one at a time.
5. Reassemble the packing follower (4) and the packing flange
(3).
6. Tighten the packing flange nuts (2) without over compressing
the packing rings.
7. For graphite packing, open and close the valve several times
then retighten the packing as required.
8. Place the valve back into service and check for leakage.
Tighten packing flange nuts (2) as required.
14. Remove the plug (20) and stem (21) subassembly from the
valve bonnet (23).
Be careful not to damage the plug (20) or liner (18) while
removing the plug/stem subassembly.
15. Remove the old packing set (22) and lantern ring (17).
Note: Applicable only for units with the optional leak
detector bonnet option.
16. Remove the liner (18) and seat ring (19) from the body.
17. Remove the retainer (8), seal ring, and back-up rings (9) from
the liner.
Note: The retainer, seal ring and back-up rings are only
used in the balanced valve assemblies.
18. Remove the seat ring (19) and seat ring gaskets (11).
Note: There is also a seat ring gasket between the liner
and bonnet.
19. Inspect the bonnet (23), plug (20) and stem (21) assembly,
liner (18), seat ring (19), and body (25) for any visual defects
or damage. Carefully inspect the dynamic sliding surfaces and
the seal interface areas.
Maintenance & Repair
The purpose of this section is to provide recommended maintenance
and repair procedures. These procedures assume the availability
of standard shop tools and equipment.
Packing Box
Packing box maintenance is one of the principal tasks during routine
servicing. Tightness of the packing (22) is maintained by proper
compression. Compression is achieved by evenly tightening the
packing flange nuts (2) against the packing flange (3). Periodic re-
tightening of the packing flange nuts may be required to maintain
proper sealing.
Care must be taken not to over tighten, as this could cre-
ate unnecessary friction preventing smooth valve opera-
tion. If packing leakage persists after applying maximum
compression, then the packing needs to be replaced.
The valve must be isolated and the process pressure
vented prior to performing any packing box mainte-
nance.

Masoneilan 78400/18400 Series LincolnLog Valve Instruction Manual | 6Copyright 2023 Baker Hughes Company. All rights reserved.
Parts Repair
Carefully examine parts for any scratches, unusual wear, or other
visual damage prior to re-assembly.
Guiding Surfaces
Guiding surfaces shown in Figure 1, including the liner (18), valve
plug (20), and plug stem (21) must be checked.If there is only
slight wear indications, then use a light abrasive to smooth out the
specific guiding surface areas. Parts with greater damage or wear
on the guide surfaces must be replaced.
21
20
18
Figure 1: Plug, Liner, and Stem Guiding Surface
Seating Surfaces
The seat ring (19) (or liner (18) with integral seat), and valve plug
(20) seating surfaces must be completely free of dents, scratches,
wear, or other visual damage. Any seating surfaces showing signs
of minor deterioration may be refurbished in accordance with the
following guidelines.
Seat Lapping
Seating surfaces may need to be lapped in order to restore the
necessary surface integrity to meet valve leakage requirements. A
maximum of .015" (0.4mm) metal removal from both the plug and
seat surfaces is allowable for any valve size. Make sure the seating
angles on the reworked parts are within the specified tolerances as
shown in the Figure 2 below. Parts requiring more metal removal to
restore shall be discarded and replaced.
PLUG SEAT RING
19
20
Figure 2: Plug and Seat Ring Seating Surfaces
1. Clean body gasket surface areas.
2. Place seat ring (19) onto a flat surface, noting the seating
angle is up.
3. If lapping procedure is done outside of the valve body, proceed
to step 4. Otherwise if lapping procedure is done inside of
valve body, install a new seat ring gasket (11).
Note: Seat ring gasket (11) is temporarily placed to hold
the seat ring during lapping.
It is imperative to use a new gasket or a test part having the
same geometrical characteristics in order to insure the correct
position of the seat ring during lapping.
This gasket (or similar part) can be kept after lapping for future
lapping use.
The gasket used for lapping must not be reused for the body
reassembly.
4. Spread a fine layer of high quality lapping compound (600 grit)
on the seating surface.
Do not allow the lapping compound to get onto the liner
(18) and upper sections of the plug (20).
5. Assemble the liner (18) on top of the seat ring.
6. Place an appropriate tool on the valve stem (21) thread to allow
for manual rotation. Options for creating a manual resurfacing
tool include using a T-handle secured with a locknut, or using
a flat piece of steel with a drilled hole and several locknuts to
fasten to the valve stem (21).
7. Insert the plug (20) and stem (21) assembly into the liner (18)
until the plug contacts the seat ring.
8. Lap the seat ring (19) by rotating the plug (20) in short
oscillating strokes. After 8 to 10 strokes, lift the plug (20) and
repeat the operation three more times at increments of 90°,
180°, and 270° from the original position.
Note: Performing the operation at various increments is
critical in maintaining concentricity between the parts during
lapping.

7 | Baker Hughes Copyright 2023 Baker Hughes Company. All rights reserved.
9. Lapping can be repeated, but should be limited as much
as possible so that the seat remains sufficiently narrow to
guarantee tightness.
10. After lapping, disassemble the parts to clean them and then
reassemble, making sure the seating angles are within
tolerance. See Figure 2.
Soft Seat Repair
The soft seat assemblies include swaged retainers and can not
be repaired in the field. These should be returned to the local
Masoneilan service center for replacement or maintenance of the
PTFE “reservoir”.
Filled PTFE “Reservoir”
Seat
Ring
Metal Sliding Collar
Figure 3: Soft Seat Option
Gaskets
Gasket seating surfaces must be free of dents, scratches, corrosion,
or other types of damage. Clean mating surfaces as required and
replace any non-conforming parts. Spiral wound gaskets (Items 10
& 11) must always be replaced after disassembly.
Metal Seal
For valves 3" and larger:
Prior to reassembly, the metal seal (10) should be inspected for
cracks or signs of wear on the coating. The metal seal can be
reused if it is free from scratches, erosion, corrosion, or any other
type of damage.
If the coating is not intact or slight wear exists, a new layer of coating
should be re-applied to the original condition by a Masoneilan
Authorized Repair Center (MARC*).
Prior to reassembly of the valve, inspect the inside of the valve
body around the area where the metal seal seats. It is common to
find slight ridges or depressions from where the seal was originally
seated. During initial assembly these depressions aid in the sealing
of the valve, however these areas can become leak paths during
reassembly if the surface is not restored to its original finish.
To prevent this potential leakage, machine the seating angle of the
bonnet at 40 degrees by approximately 0.1 inches (2.5 mm) deep,
thus causing the seal ring to seat further inside the valve body (on
a new undeformed surface). Refer to Figure 4 for details.
Edge must be free
from nicks and burrs
ø 0.13[.005]
Ra 0.8
40°30’
39°30’
A
Figure 4: Bonnet Seating Angle Details(see page 16)
Valve Plug and Stem
If the valve stem needs to be replaced, then the plug must also
be changed in order to guarantee correct pinning of the assembly.
However, an undamaged valve stem can be reused even if the
valve plug needs to be replaced.
Be careful not to damage the plug guiding or seating
surfaces while performing the following operations.
Plug Removal
Drive out the plug pin (12) using a punch or by drilling it out. If
drilling is required, use a drill bit that is smaller than the plug pin
size. Unscrew the plug (20) from the stem (21) following complete
removal of the plug pin.
In case of 440C stainless steel or other hardened materi-
als, plug and stem assembly can not be machined or
drilled. If either the plug or stem is damaged, the parts
must be purchased as a complete assembly.
Valve Reassembly
After completing the recommended maintenance and repair actions
noted above, reassemble the valve using the following procedures.
Plug Stem Assembly
Reassemble the plug and stem subassembly using new
replacement parts as required. Thread the valve plug (20) into the
stem (21), making sure that the assembly is tight and secure. Apply
torque to stem per Tables 1A and 1B.
Stem Size Torque Dimension A
inches mm ft-lbs daNm inches mm
0.500 12.70 50 7.190/.187 4.8/4.7
0.750 19.05 125 17 .190/.187 4.8/4.7
1.000 25.40 250 34 .219/.218 5.6/5.5
1.125 28.58 250 34 .380/.375 9.6/9.5
Table 1A: Stem Assembly All Materials (Except 440C)
Stem Size Torque Dimension A
inches mm ft-lbs daNm inches mm
0.500 12.70 44 6.200/.197 5
0.750 19.05 118 16 .200/.197 5
1.000 25.40 184 25 .319/.315 8
1.125 28.58 184 25 .400/.394 10
Table 1B: Stem Assembly
440C Material (Only) Pin Installation

Masoneilan 78400/18400 Series LincolnLog Valve Instruction Manual | 8Copyright 2023 Baker Hughes Company. All rights reserved.
Drill a hole for the groove pin per dimension ‘A’ in Table 1. Place
the plug and stem assembly on a V-block and drill into the plug and
stem. Apply a small amount of grease on the replacement pin and
press fit into the hole. See Figure 5 for details.
Note: Make sure the pin is recessed by approximately .06"
(1.5mm) below the stem surface on both ends.
ø “A” for groove pin
60°
1.00[.039]
Pinning Detail
Figure 5: Groove Pin Details
Assembly Alignment
Check the run out of the plug and stem to ensure they are within
.005" (0.13mm) TIR. Use a plastic or rubber mallet to tap the parts
into alignment if the assembly is out of tolerance.
Valve Reassembly
Make sure the valve body and all gasket surfaces are clean and
free of any damage.
Make sure any recommended lubricants or sealing
compounds are compatible with the process uid. Use
acceptable substitutes as required.
Valve Sizes 1" and 1-1/2"
1. Assemble the seat ring gasket (11) into the valve body (25).
2. Assemble the liner (18) into the valve body (25) making sure
that it aligns correctly on top of the seat ring gasket (11).
3. Assemble the plug (20) and stem (21) subassembly into the
liner (18).
4. For the balanced trim design configuration (available in 1.5"
size only), lubricate the seal ring and both back-up rings (9)
and carefully assemble it over the plug (20). Make sure the
lower back-up ring right angle corner is facing the extrusion
gap between the liner and plug (see Figures 6A and 6B) and
the open end of the seal faces upward or away from the seat.
Use the seal retainer (Step 5) to push the balance seal and
back-up rings fully into the liner.
5. Install the seal retainer (8) into the liner (18). For the balanced
configuration, use the seal retainer to push the seal ring and
back-up rings (9) fully into the liner.
6. Install the body gasket (10) and assemble the bonnet (23) onto
the body (25). Be careful not to damage the stem (21) while
installing the bonnet.
Valve Sizes 2" to 8"
1. Assemble one seat ring gasket (11) into the valve body (25).
2. Assemble the other seat ring gasket (11) onto the seat ring
(19).
Note: Make sure the seat ring gasket (11) is assembled
onto the side of the seat ring (19), which mates with the
liner (18). The correct side of the seat ring has the seating
surface and a longer boss for alignment with the liner.
3. Assemble the seat ring (19) into the valve body (25) making
sure that it aligns correctly on top of the seat ring gasket (11)
located in the body.
4. Assemble the liner (18) into the valve body (25) making sure
it aligns correctly on top of the seat ring (19) and seat ring
gasket (11).
5. Assemble the plug (20) and stem (21) subassembly into the
liner (18).
6. For the balanced trim design configuration, lubricate the seal
ring and both back-up rings (9) and carefully assemble it over
the plug (20). Make sure the lower back-up ring right angle
corner is facing the extrusion gap between the liner and plug
(see Figures 6A and 6B) and the open end of the seal faces
upward or away from the seat. Use the seal retainer (step 7) to
push the balance seal and back-up rings fully into the liner.
7. Install the seal retainer (8) into the liner (18). For the balanced
configuration, use the seal retainer to push the seal ring and
back-up rings (9) fully into the liner (18).
Figure 6A: Incorrect Seal Ring Installationshowing lower
back-up ring 90° angle facing away from extrusion gap
9
20
8
10
18
Figure 6B: Correct Seal Ring Installationshowing lower back-
up ring 90° angle facing the extrusion gap
For 2" valve sizes, follow assembly instruction #8:
8. Install the body gasket (10) and assemble the bonnet (23)
over the valve stem (21). Push it down carefully and align the
bonnet bolt holes with the body studs (6). Be careful not to
damage the stem during the assembly process.

9 | Baker Hughes Copyright 2023 Baker Hughes Company. All rights reserved.
For 3" size valves and larger follow assembly instructions 9-11:
9. Install the seat gasket (11) onto the liner and assemble the
bonnet (23) over the valve stem (21). Push it down carefully
and align the bonnet with the seal retainer (8). Be careful not
to damage the stem during the assembly process.
10. Assemble the metal seal (10) over the bonnet (23) and slide
down into the groove formed between the body and bonnet.
11. Assemble the bonnet flange (24) over the bonnet (23) and
align the bolt holes with the body studs (6). Make sure the
bonnet flange is also aligned with the metal seal (10).
Body Bolting
1. Grease the threads of the valve body studs (6) and the bearing
surfaces of the body nuts (7).
2. Assemble the body nuts (7) onto the body studs (6) manually,
and hand tighten evenly so that the internal parts are held
in place. The face of the bonnet or bonnet flange should be
parallel to the top surface of the valve body.
3. Tighten the body nuts (7) evenly by applying the torque in
the increments and the sequences as defined in Table 2 and
Figure 7.
Note: For gasketed bonnet joint designs, torque bonnet
down until metal to metal contact exists between body
and bonnet.
4. Check plug and stem assembly in between various tightening
steps to make sure they are not binding due to misalignment.
Valve Size Bolting
Requirements
Torque
Requirements
inches DN Size Qty ft-lbs daNm
1 & 1.5 25 & 40 .750- 10UNC 8 120-145 16-20
2 50 1.125- 8UN 8 320-430 43-58
3 80 1.000- 8UNC 8 225-310 31-42
4 100 1.250- 8UN 8 440-580 60-79
6 150 1.375- 8UN 12 610-760 83-103
8 200 1.875- 8UN 12 1700-2000 230-271
Table 2: Body Bolting Torque Requirements
Note: Tighten the body nuts (7) in the following increments
(units of ft-lbs [daNm]): 10 [1.3], 20 [2.6], 40 [5], 75 [10], 140
[19], 225 [30], 400 [54], 650 [88], plus increments of 250 [34]
until the required torque is reached. Between each pass check
to make sure plug assembly strokes freely to ensure proper
alignment.
Visually inspect the assembly for proper stud and nut installation
by checking the number of exposed threads. If less than one stud
thread or more than 2-1/2 threads are extended above the body
nut after final tightening, then double check the assembly for proper
installation and alignment.
Figure 7: Torque Sequence
Packing Box Assembly
Visually inspect the stem and packing box for cleanliness and
proper surface finish. Lubricate the I.D. of the packing box with
Never-Seez or equivalent. Assemble the packing box components
per the maintenance instructions on page 5.
Figure 8 : Standard Packing1 V-Ring Packing Adapter7
pieces V-Ring Packing
Fig-
ure 9 : 285C or Latty 326.1M Packing6 pieces 285C6 pieces
Latty 326.1

Masoneilan 78400/18400 Series LincolnLog Valve Instruction Manual | 10Copyright 2023 Baker Hughes Company. All rights reserved.
Figure 10 : Graphite Packing
F : 3 pieces Filament Graphite
G : 3 pieces Graphite Ring
Z : 3 pieces Zinc Washer
Low Emissions LE Packing (Optional)
The Masoneilan LE™(Low Emissions) Packing is a high performance
packing system capable of containing fugitive emissions well below
the specifications of the most severe recommendations. It is also
available in a firesafe configuration.
Alignment
Groove
Packing Flange
Upper Follower
Disc Spring Set
Lower Follower
V-Ring
Packing Set
Female
Adapter
KALREZ
VESPEL
Kalrez
Male Adapter
Packing Set Follower Assembly
Part Qty Part Qty
VESPEL Female
Adapter 1 Upper Follower 1
KALREZ V-Ring 2Disc Spring 8
VESPEL V-Ring 1 Lower Follower 1
VESPEL Male Adapter 1
Figure 11: LE Packing Configuration
(Shown in Loaded Position)
The packing is provided as a set of five pieces. It consists of
two adapter rings and three V-rings. An alternating pattern of
Perfluoroelastomer (PFE) and long carbon fiber filled PTFE V-rings
are used.
Applied properly, this packing exhibits very little cold flow (or creep).
Consequently, it can effectively prevent fugitive emissions leaks
from a control valve. The LE Packing system can directly replace
conventional packing, requiring no modification to the control valve
or actuator.
A spring loaded, two-piece follower assembly is used to maintain a
constant load on the packing, and is necessary for thermal cycling
applications. As the definition of thermal cycling can vary, and
processes are potentially subject to unpredicted thermal gradients,
LE Packing is only available with the spring loaded follower.
Installation should be performed as detailed in the following
paragraphs.
Preparation
Stem
Inspect stem for any nicks or scratches on the surface finish. Reject
the stem for any of these reasons as they may damage packing.
Note: A properly etched part number on the stem in the
packing area will have no adverse effect on the performance
of the packing.
Stem finish should be 3-7 AARH (Ra 0,1/0,2).
Packing Box
Note: Bonnets that have a lube hole require installation of a
lantern ring within the packing arrangement shown in Figure
12.
Packing box should be clean and free of burrs, rust, and
any foreign matter. Parts can be cleaned with denatured
alcohol.
Note: Packing box finish should be 125 AARH (Ra 0.8) or
better.
The packing box may be bored or honed oversize by up to 0.015"
(0.38 mm) above the nominal diameter to improve the finish. For
instance, a nominal 0.875" (22.22 mm) packing box may be bored
or honed up to 0.890" (22.60 mm) and the LE Packing will still seal
properly.
Packing box must be finished to the bottom of the bore.
VIEW SHOWN WITH GRAPHITE PACKING
OPTION AND LANTERN RING WITH LUBE HOLE
Figure 12
Packaging
Inspect packing rings. DO NOT use packing if any nicks or
scratches on packing are observed. Check packing and ensure
that it is in the proper arrangement (see Figure 13). PFE material
can be identified by the gloss black molded finish. PTFE material
has a dull black machined finish.
Figure 13

11 | Baker Hughes Copyright 2023 Baker Hughes Company. All rights reserved.
Valve Travel Requirements
See table below for rated travel by specific valve size.
Valve Size Travel
inches DN inches mm
1 25 .25 6.35
1.5 40 .25 6.35
2 50 .38 9.65
3 80 .62 15.7
4 100 .75 19.1
6 150 1.00 25.4
8 200 1.25 31.8
Table 3: Valve Travel
Note: Actuator over travel of 0.12" (3 mm) past the rated travel
noted above is necessary to achieve required seat loading.
Spring Loaded Follower
The spring loaded follower (available for applications rated ANSI
300 and below) consists of an upper and lower follower and eight
(8) disc springs (see Figure 14). The springs are installed inside
the lower follower and positioned alternately. The assembly is held
together by tape, which must be removed before installation.
Figure 14
Packing Installation
1. The packing must be lubricated with Krytox® fluorinated
grease prior to installation (Krytox GPL206 or equivalent).
2. Packing should be lubricated as a set (not individually) to
minimize getting lubricant between the rings.
3. Packing should be lubricated with a generous application to
the O.D. and I.D. of the packing set.
Note: All exposed surfaces of the packing set must be
covered with the lubricant.
4. PFE/PTFE is to be installed as a set. Carefully slide the
packing set down the stem. Do not cock or force the packing
on the threads.
If the packing set separates while on the stem, do not remove.
Continue installing the remaining pieces to put the set back
together.
5. Gently press the packing into the packing box. Do not tap the
packing down into the box.
6. The spring loaded follower is installed on top of the packing.
This follower is installed as an assembly held together by tape.
This tape should be removed after assembly. Proper assembly
of the packing box will leave the top of the Lower Follower 0.25
- 0.50 inches (6 to 13 mm) above the bonnet.
A groove is scribed into the O.D. of the upper follower. The
packing flange is tightened evenly until the top of the Lower
Follower aligns with the scribe mark (groove) in the Upper
Follower.
Note: This is the optimum loading for this packing. Further
tightening will shorten life of the packing. Thread locking
compound can be used on packing nuts.
7. The packing should be checked for leakage.
8. Packing load should be checked after the valve has cycled
approximately 500 times. Adjust if necessary. No further
adjustment should be required for the life of the packing.

Masoneilan 78400/18400 Series LincolnLog Valve Instruction Manual | 12Copyright 2023 Baker Hughes Company. All rights reserved.
Parts References
Valve Sizes 2 Inch and Smaller
Item No. Description
1Packing Stud
2Packing Flange Nut
3Packing Flange
4 Packing Follower
5Yoke Nut
6Body Stud
7Body Nut
8Retainer
• 9 Seal Ring and Back-up Rings
•10 Body Gasket
•11 Seat Ring Gasket
•17 Lantern Ring if Applicable
18 Liner
19 Seat Ring
20 Plug
21 Stem
•22 Packing S/A
23 Bonnet
24 Bonnet Flange
25 Body
Valve Sizes 3 Inch and Larger
Item No. Description
1Packing Stud
2Packing Flange Nut
3Packing Flange
4 Packing Follower
5Yoke Nut
6Body Stud
7Body Nut
8Retainer
• 9 Seal Ring and Back-up Rings
•10 Metal Seal
•11 Seat Ring Gasket
•17 Lantern Ring if Applicable
18 Liner
19 Seat Ring
20 Plug
21 Stem
•22 Packing S/A
23 Bonnet
24 Bonnet Flange
25 Body
•Recommended Spare Parts
Table 4: Valve Parts List

13 | Baker Hughes Copyright 2023 Baker Hughes Company. All rights reserved.
Figure 15 - 1" Size Unbalanced Assembly

Masoneilan 78400/18400 Series LincolnLog Valve Instruction Manual | 14Copyright 2023 Baker Hughes Company. All rights reserved.
Figure 16 - 1.5" Size Balanced Assembly
1.5" Size Unbalanced Trim Detail
Correct Seal Ring Installationshow-
ing lower back-up ring 90° angle
facing the extrusion gap
9
20
8
10
18

15 | Baker Hughes Copyright 2023 Baker Hughes Company. All rights reserved.
Figure 17 - 2" Size Balanced Assembly
2" Size Unbalanced Trim Detail
Soft Seat Option
Filled PTFE “Reservoir”
Seat Ring
Metal Sliding Collar
Correct Seal Ring Installationshow-
ing lower back-up ring 90° angle
facing the extrusion gap
9
20
8
10
18