Emerson Fisher LR125 Series User manual

Instruction Manual
D103576X012
January 2020
Type LR125
!
WARNING
Type LR125 Pressure Reducing Liquid Regulator
TYPE LR125 REGULATOR TYPE MR95H/MR95HP PILOT
Figure 1. Type LR125 Pressure Reducing Liquid Regulator and Type MR95H/MR95HP Pilot
Failure to follow these instructions or
to properly install and maintain this
equipment could result in bursting
of the equipment and/or chemical
contamination causing property damage
and personal injury or death.
Fisher™ regulators must be installed,
operated and maintained in accordance
with federal, state and local codes, rules
and regulations and Emerson Process
Management Regulator Technologies,
Inc. (Emerson) instructions.
If the regulator discharges process
uid or a leak develops in the system,
service to the unit may be required.
Failure to correct trouble could result in
a hazardous condition.
Call a qualied service person to service
the unit. Installation, operation and
maintenance procedures performed
by unqualied personnel may result
in improper adjustment and unsafe
operation. Either condition may result in
equipment damage or personal injury.
Only a qualied person must install or
service the regulator.
The Type LR125 is designed for liquid
service. Do not operate the regulator
in applications where temperatures are
below the process uid’s freezing point
or above its boiling point which are
dependent on the process uid and the
application pressures.

Type LR125
2
Specications
Specications for the Type LR125 regulator are shown below. Other information for the main valve appears on the
nameplate. The control spring range for the pilot is marked on the nameplate of Type MR95H/MR95HP pilot.
Main Valve Body Sizes, End Connection Styles
and Structural Design Ratings(1)
See Table 1
Maximum Inlet Pressures(1)
Type LR125 Main Valve: See Table 1
Type MR95H/MR95HP Pilot: See Table 2
Type 112 Restrictor: 1500 psig / 103 bar
Outlet (Control) Pressure Ranges
See Table 3
Main Valve Plug Travel
1 in. / DN 25: 0.37 in. / 9.4 mm
2 in. / DN 50: 0.68 in. / 17 mm
3 in. / DN 80: 0.98 in. / 25 mm
4 in. / DN 100: 1.19 in. / 30 mm
Main Valve Minimum Di󰀨erential Pressures(1)
See Table 6
Main Valve Internal Inlet Strainer Sizes
1 in. / DN 25:
12 Mesh (0.0661 in. / 1.68 mm)(2)
2, 3 and 4 in. / DN 50, 80 and 100:
10 Mesh (0.0787 in. / 2 mm)(2)
Temperature Capabilities(1)
See Table 4
Pressure Registration
1/2 NPT External
Spring Case Vent
Type Y602-12
Construction Materials
Type LR125 Main Valve
Body: WCC Steel, CF8M or CF3M Stainless steel
Bonnet: LF2 Steel or 316/316L Stainless steel
Type LR125 Main Valve (continued)
Bonnet Bushing: Stainless steel
Cage: Stainless steel
Spring: Stainless steel
Top Plug: Stainless steel
Bottom Plug: Stainless steel
Internal Inlet Strainer: Stainless steel
Diaphragm: Nitrile (NBR) or Fluorocarbon (FKM)
O-rings: Nitrile (NBR) or Fluorocarbon (FKM)
Flanged Locknut: Stainless steel
Backup Rings: Polytetrauoroethylene (PTFE)
Upper Spring Seat: Stainless steel
Indicator Protector and Cover: Plastic
Indicator Stem: Stainless steel
Indicator Fitting: Stainless steel
Travel Indicator Plug: Stainless steel
Type MR95H/MR95HP Pilot
Body: WCC Steel or CF8M Stainless steel
Spring Case: WCC Steel or CF8M Stainless steel
Orice: Stainless steel
Diaphragm: Neoprene (CR) or Fluorocarbon (FKM)
Disk: Nitrile (NBR) or Fluorocarbon (FKM)
Mounting Parts
Pilot Mounting Pipe Nipple: Plated steel or
Stainless steel
Pipe Fittings: Plated steel or Stainless steel
Tubing: Stainless steel
Type 112 Restrictor
Body: 15-5 Stainless steel
Groove Valve: Stainless steel
Retainer: Stainless steel
Pipe Plug: Stainless steel
O-rings: Nitrile (NBR) or Fluorocarbon (FKM)
Options
• Pre-piped Pilot Supply
• Travel Indicator
1. The pressure/temperature limits in this Instruction Manual and any applicable standard or code limitation should not be exceeded.
2. Nominal sieve opening
Introduction
Scope of the Manual
This instruction manual provides installation, startup,
adjustment, maintenance and parts ordering information
for Type LR125 pressure reducing regulator, 1/2 NPT
Type MR95H/MR95HP pilot and Type 112 restrictor.
Product Description
The Type LR125 pilot-operated, pressure reducing
regulator is used for liquid applications and include
a Type 112 restrictor and a 1/2 NPT Type MR95H/
MR95HP pilot.

Type LR125
3
!
WARNING
Pilot Type Description
Type MR95H — Pressure reducing pilot for 15 to
150 psig / 1.0 to 10.3 bar outlet pressures. Designed
to handle inlet pressures up to 300 psig / 20.7 bar.
Type MR95HP — Pressure reducing pilot for 15 to
400 psig / 1.0 to 27.6 bar outlet pressures. Designed
to handle inlet pressures up to 600 psig / 41.4 bar.
Principle of Operation
As long as the outlet (control) pressure is above
the outlet pressure setting, the pilot valve plug or
disk remains closed (Figure 2). Force from the main
spring, in addition to inlet pressure bleeding through
the restrictor, provide downward loading pressure to
keep the main valve diaphragm and plug assembly
tightly shuto󰀨.
When the outlet pressure decreases below the pilot
outlet pressure setting, the pilot plug or disk assembly
opens. Loading pressure bleeds downstream through
the pilot faster than it can be replaced through the
supply line. This reduces loading pressure on top of
the main valve diaphragm and plug assembly and
lets the unbalanced force between inlet and loading
pressure overcome the main spring force to open the
Type LR125 diaphragm and plug assembly.
As the outlet pressure rises toward the outlet pressure
setting, it compresses the pilot diaphragm against
the pilot control spring and lets the pilot valve plug
or disk close. Loading pressure begins building on
the Type LR125 diaphragm and plug assembly. The
loading pressure, along with force from the main
spring, pushes the diaphragm and plug assembly onto
the tapered-edge seat, producing tight shuto󰀨.
Type LR125 Installation
Personal injury, equipment damage or
leakage due to escaping process uid
or bursting of pressure-containing
parts may result if this regulator is
overpressured or is installed where
service conditions could exceed
the limits given in Specications
section or where conditions exceed
any ratings of the adjacent piping or
piping connections.
To avoid such injury or damage, provide
pressure-relieving or pressure-limiting
devices (as required by the appropriate
code, regulation or standard) to prevent
service conditions from exceeding limits.
Additionally, physical damage to the
regulator could break the pilot o󰀨 the
main valve, causing personal injury
and property damage due to escaping
process uid. To avoid such injury
and damage, install the regulator in a
safe location.
Table 1. Type LR125 Main Valve Body Sizes, End Connection Styles, Structural Design Ratings
and Maximum Operating Inlet Pressures(1)
MAIN VALVE BODY SIZES MAIN VALVE BODY
MATERIAL END CONNECTION STYLES(2)
STRUCTURAL DESIGN
RATING(3)
MAXIMUM OPERATING
INLET PRESSURE(3)
In. DN psig bar psig bar
1, 2, 3 and 4 25, 50, 80 and 100
WCC Steel
NPT or SWE
(1 and 2 in. only) 1500 103 600 41.4
CL150 RF 290 20.0 290 20.0
CL300 RF 750 51.7
600 41.4CL600 RF 1500 103
PN 16/25/40 RF(4) 580 40.0
CF8M Stainless Steel
NPT
(1 and 2 in. only) 1440 99.2 550 37.9
CL150 RF 275 19.0 275 19.0
CL300 RF 720 49.6
550 37.9CL600 RF 1440 99.2
PN 16/25/40 RF(4) 580 40.0
1. The pressure/temperature limits in this Instruction Manual and any applicable standard or code limitation should not be exceeded.
2. Ratings and end connections for other than ASME standard can usually be provided. Contact your local Sales O󰀩ce for assistance.
3. Maximum cold working pressure (CWP) per ASME B16.34 or product bulletin limit, whichever is lowest. Temperature may decrease these maximum pressures.
4. Not available for 4 in. / DN 100 body size.

Type LR125
4
M1215
INLET PRESSURE
OUTLET PRESSURE
ATMOSPHERIC PRESSURE
LOADING PRESSURE
Figure 2. Type LR125 Operational Schematic
CONTROL SPRING
TYPE MR95H/MR95HP PILOT
TYPE 112 RESTRICTOR
VALVE PLUG
MAIN SPRING
DIAPHRAGM AND
PLUG ASSEMBLY
INTERNAL STRAINER
SUPPLY
LINE
DIAPHRAGM

Type LR125
5
B2605_A
!
WARNING
CAUTION
Liquid pressure control systems should
be designed using engineering practices
to eliminate quick control starting or
stopping of the ow stream, which can
produce water hammer.
The robust design of the Type LR125 allows this
regulator to be installed indoors or outdoors. This
regulator is designed to withstand the elements. The
powder paint coating protects against minor impacts,
abrasions and corrosion. When installed outdoors,
the Type LR125 does not require protective housing.
However, the Type MR95H/MR95HP pilot should be
oriented so that the pilot spring case vent is pointed
down. Otherwise, make sure the vent is protected
so that rain, moisture, insects or any debris will not
accumulate inside or block the vent assembly.
When installed indoors, no remote venting is required
except on the pilot spring case. Refer to Step 5 of the
following procedure for the correct venting practices.
1. Only personnel qualied through training and
experience should install, operate and maintain a
regulator. Before installation, make sure that there
is no damage to or debris in the regulator. Also,
make sure that all tubing and piping are clean
and unobstructed.
Note
The Type LR125 internal inlet strainer
is intended to prevent occasional
large particles from entering the main
valve. If the owing media contains
continuous particles, upstream ltration
is recommended before the main
valve and in the pilot supply piping.
See the Specications section for the
corresponding mesh size of the internal
inlet strainer.
2. A Type LR125 regulator may be installed in any
orientation, as long as ow through the regulator
matches the direction of the arrow on the main
valve body and the pilot vent is pointed down.
However, for easier maintenance, install the
regulator with the bonnet up.
Provide adequate support to the bonnet
when disassembling Type LR125
pressure reducing regulator installed in
a vertical installation or other application
where the bonnet is not oriented upward.
Without adequate support, the bonnet
may fall and cause physical injury when
the cap screws are loosened.
TYPE MR95H/MR95HP PILOT INSTALLATION WITH PILOT EXHAUST INTO CONTROL LINE
Figure 3. Typical Type LR125 Installation Schematic
Table 2. Pilot Maximum Operating Pressures(2)
PILOT BODY SIZE BODY AND SPRING CASE MATERIAL MAXIMUM INLET PRESSURE MAXIMUM OUTLET PRESSURE
Type MR95H 1/2 NPT Steel
Stainless steel
300 psig / 20.7 bar
300 psig / 20.7 bar
300 psig / 20.7 bar
300 psig / 20.7 bar
Type MR95HP 1/2 NPT Steel
Stainless steel
600 psig / 41.4 bar
600 psig / 41.4 bar
600 psig / 41.4 bar
550 psig / 37.9 bar
1. The pressure/temperature limits in this Installation Manual, and any applicable standard or code limitation should not be exceeded.
2. Temperature and/or the body end connection may decrease these maximum pressures.
BLOCK VALVE
INLET
SUPPLY PRESSURE LINE
RESTRICTOR
CONTROL LINE
TYPE MR95H/MR95HP PILOT
ALTERNATE CONTROL LINE
HAND VALVE
OUTLET
BLOCK VALVE

Type LR125
6
Table 3. Outlet (Control) Pressure Ranges
PILOT
OUTLET PRESSURE RANGE SPRING WIRE DIAMETER SPRING FREE LENGTH SPRING PART NUMBER
AND COLOR
psig bar In. mm In. mm
Type MR95H
15 to 30
25 to 75
70 to 150
1.0 to 2.1
1.7 to 5.2
4.8 to 10.3
0.207
0.234
0.283
5.26
5.94
7.19
2.50
2.60
2.44
63.5
65.9
62.0
ERCA04288A0, Yellow
ERAA01910A0, Green
ERAA01911A0, Red
Type MR95HP 15 to 100
80 to 400
1.0 to 6.9
5.5 to 27.6
0.281
0.375
7.14
9.53
2.50
2.60
63.5
63.5
ERCA04294A0, Unpainted
ERCA04293A0, Unpainted
Table 4. Diaphragm Material Selection Information
CRITERIA
DIAPHRAGM MATERIAL
17E68 Nitrile (NBR) (Standard) 17E97 Nitrile (NBR) 17E88 Fluorocarbon (FKM)
Liquid Temperature -20 to 150°F / -29 to 66°C 0 to 150°F / -18 to 66°C 0 to 250°F / -18 to 121°C(1)(2)
General Applications Best for low pressure di󰀨erential service
or cold temperature applications
Best for abrasive or erosive service
applications Best for high temperature applications
Heavy Particle Erosion Fair Excellent Good
1. Fluorocarbon (FKM) is limited to 200°F / 93°C in hot water.
2. For di󰀨erential pressures above 400 psig / 28 bar diaphragm temperature is limited to 150°F / 66°C.
Table 5. Main Valve Maximum Pressure Ratings, Diaphragm Selection Information and Main Spring Selection(1)
BODY SIZE DIAPHRAGM MATERIAL
MAXIMUM OPERATING
INLET PRESSURE(4)
MAXIMUM OPERATING
DIFFERENTIAL PRESSURE(3)(4)
MAXIMUM EMERGENCY INLET
AND DIFFERENTIAL PRESSURE MAIN SPRING COLOR
In. DN psig bar psig bar psid bar d
1 25
17E68 Nitrile (NBR) 300 20.7 300 20.7 300 20.7 Black and Yellow
17E97 Nitrile (NBR) 300 20.7 300 20.7 300 20.7 Black and Yellow
600 41.4 600 41.4 600 41.4 Black and White(2)
17E88
Fluorocarbon (FKM)
300 20.7 300 20.7 300 20.7 Black and Yellow
600 41.4 500 34 600 41.4 Black and White(2)
2 50
17E68 Nitrile (NBR) 300 20.7 300 20.7 300 20.7 Green and White
17E97 Nitrile (NBR) 300 20.7 300 20.7 300 20.7 Green and White
600 41.4 600 41.4 600 41.4 Red(2)
17E88
Fluorocarbon (FKM)
300 20.7 300 20.7 300 20.7 Green and White
600 41.4 500 34 600 41.4 Red(2)
380
17E68 Nitrile (NBR) 300 20.7 300 20.7 300 20.7 Light Blue and White
17E97 Nitrile (NBR) 300 20.7 300 20.7 300 20.7 Light Blue and White
600 41.4 600 41.4 600 41.4 Black and White(2)
17E88
Fluorocarbon (FKM)
300 20.7 300 20.7 300 20.7 Light Blue and White
600 41.4 500 34 600 41.4 Black and White(2)
4100
17E68 Nitrile (NBR) 300 20.7 300 20.7 300 20.7 Green and White
17E97 Nitrile (NBR) 300 20.7 300 20.7 300 20.7 Green and White
600 41.4 600 41.4 600 41.4 Red and White(2)
17E88
Fluorocarbon (FKM)
300 20.7 300 20.7 300 20.7 Green and White
600 41.4 500 34 600 41.4 Red and White(2)
1. See Table 1 for main valve structural design ratings and Table 2 for pilot ratings.
2. The black and white, red and red and white springs are only recommended for applications where the maximum inlet pressure can exceed 300 psig / 20.7 bar.
3. Maximum di󰀨erential pressures may be lower for applications where cavitation may be present.
4. These are recommendations that provide the best regulator performance for a typical application. Please contact your local Sales O󰀩ce for further information if a deviation from the standard
recommendations are required.
Table 6. Main Valve Minimum Dierential Pressures(1)
MAIN VALVE
BODY SIZE MAIN SPRING PART NUMBER AND COLOR DIAPHRAGM
MATERIAL
MINIMUM DIFFERENTIAL, PERCENT OF CAPACITY
For 90% Capacity For 100% Capacity
In.. DN psid bar d psid bar d
125 GE12727X022, Black and Yellow 17E68 and 17E88 30 2.1 30 2.1
17E97 35 2.5 35 2.5
19B2401X022, Black and White 17E88 and 17E97 43 3.0 43 3.0
250 18B2126X022, Green and White 17E68 and 17E88 18 1.2 19 1.3
17E97 24 1.7 24 1.7
18B5955X012, Red 17E88 and 17E97 29 2.0 31 2.1
380 19B0781X022, Light Blue and White 17E68 and 17E88 21 1.5 28 1.9
17E97 23 1.6 23 1.6
19B0782X022, Black and White 17E88 and 17E97 32 2.2 38 2.6
4100 18B8501X022, Green and White 17E68 and 17E88 16 1.1 30 2.1
17E97 16 1.1 34 2.3
18B8502X022, Red and White 17E88 and 17E97 21 1.5 40 2.8
1. See Table 1 for structural design ratings and Table 2 for pilot rating.

Type LR125
7
CAUTION
3. The standard pilot mounting position is as
shown in Figure 1. Other mounting positions
are available.
4. Apply a good grade of pipe compound to the
external pipeline threads for a threaded body,
or use suitable line gaskets for a anged body.
Use approved piping procedures when installing
the regulator.
A regulator may leak toxic chemical to
the environment. In toxic or hazardous
liquid service, leaked chemical may
accumulate and cause personal injury,
death or property damage due to
escaping uid.
To prevent such injury or damage,
provide piping or tubing to vent the
hazardous liquid to a remote, safe
location away from air intakes or any
hazard-prone location. The exhaust
piping must be designed and installed to
guard against excessive ow restriction.
Protect the vent line or stack opening
against condensation or clogging.
5. If system operation during maintenance is
required, install isolating and vent valves
as needed.
6. A clogged pilot spring case vent may cause
the regulator to function improperly. To prevent
plugging (and to keep the spring case from
collecting moisture, corrosive chemicals or other
foreign material) point the vent down, orient it to
the lowest possible point on the spring case or
otherwise protect it. Protect the vent assembly
from icing, moisture or debris that may cause
blockage, as required. Inspect the vent regularly
to make sure it has not been plugged. To remotely
vent a spring case, remove the vent and install
obstruction-free tubing or piping into the 1/4 NPT
vent tapping. Provide protection on a remote vent
by installing a screened vent cap onto the remote
end of the vent pipe.
7. As shown in Figure 3, run a supply pressure line
from the upstream pipeline to the restrictor inlet
(use 3/8 NPT outer diameter tubing or larger).
Install a lter or strainer upstream of the restrictor,
if needed, to keep the supply source from clogging
the restrictor or pilot. Inspect and clean this lter
regularly to make sure it has not been plugged
which can prevent proper regulator operation.
8. Install a downstream pressure control line with
a minimum size of 1/2 in. / 13 mm (as shown
in Figure 3) to the pilot control line or outlet
connection. Connect the other end of the control
line at a minimum of 8 to 10 pipe diameters
downstream of the regulator in a straight run of
pipe. Do not place a control line connection in a
turbulent area, such as in or directly downstream
of a swage or elbow. Signicant restrictions in
the control line can prevent proper pressure
registration. When using a hand valve, it should be
a full ow valve, such as a full port ball valve.
9. Good piping practices usually require swaging up
to larger downstream piping to obtain reasonable
downstream uid velocity.
Startup and Adjustment
Note
Tables 1 and 2 show the maximum inlet
pressures for specic constructions.
Use pressure gauges to monitor inlet
pressure, outlet pressure and any
intermediate pressure during startup.
Startup
1. Make sure all block and vent valves are closed.
2. Back out the pilot adjusting screw.
3. Set the restrictor to the “4” position.
4. SLOWLY OPEN the valves in the following order:
a. Pilot supply and control line valve(s), if used
b. Inlet block valve
c. Outlet block valve
5. Set the pilot to the desired outlet (control) pressure
according to the pilot adjustment procedure.
Pilot Adjustment
The factory setting of the regulator can be varied
within the pressure range stamped on the nameplate.
To change the outlet pressure, loosen the jam nut
(key 17, Figure 15) and turn the adjusting screw
(key 15) clockwise to increase outlet pressure or
counterclockwise to decrease it. Monitor the outlet
pressure with a test gauge during the adjustment.
Tighten the locknut to maintain the desired setting.
All regulator springs can be backed o󰀨 to provide zero
outlet. Recommended outlet pressure ranges available
and color codes of the respective springs are shown in
Table 3.

Regulator Performance 2468
Accuracy
Hysteresis
Stability
Speed of Response (Demand Decrease)
Speed of Response (Demand Increase)
Increased Performance Decreased Performance
Regulator Performance
2468
Accuracy
Hysteresis
Stability
Speed of Response (Demand Decrease)
Speed of Response (Demand Increase)
Increased Performance Decreased Performance
Regulator Performance
2468
Accuracy
Hysteresis
Stability
Speed of Response (Demand Decrease)
Speed of Response (Demand Increase)
Increased Performance Decreased Performance
112 Restrictor Adjustment Guide
112 Restrictor Adjustment Guide
112 Restrictor Adjustment Guide
REGULATOR PERFORMANCE 2468
Accuracy
Hysteresis
Stability
Speed of Response (Demand Decrease)
Speed of Response (Demand Increase)
Increased Performance Decreased Performance
TYPE 112 RESTRICTOR SETTING
Type LR125
8
W4559_1
11B5004-A
PILOT SUPPLY CONNECTION: 1/4 NPT PIPE
CONNECTS TO UPSTREAM PILOT SUPPLY TAP
LOADING CONNECTION: 1/4 NPT PIPE CONNECTS TO
TYPE LR125 DIAPHRAGM LOADING PORT
OUTLET CONNECTION: 1/4 NPT PIPE
CONNECTS TO PILOT INLET CONNECTION
OPTIONAL LOADING CONNECTION:
1/4 NPT NORMALLY PLUGGED
Figure 4. Type 112 Restrictor
RESTRICTOR ADJUSTMENT
RESTRICTOR ADJUSTMENT GUIDE
Figure 5. Restrictor Adjustment

Type LR125
9
!
WARNING
!
WARNING
Type 112 Restrictor Adjustment (Figure 5)
The Type 112 restrictor controls the regulator’s
accuracy and speed of response. A restrictor setting
of 4 is recommended to optimize accuracy, speed
of response and stability. However, the restrictor
can be used to ne tune the regulator for maximum
performance by decreasing the restrictor setting for
tighter control (increased opening speed, decreased
closing speed); or increasing the restrictor setting
for maximum stability (decreased opening speed,
increased closing speed). A lower setting also provides
a narrower proportional band for better accuracy. The
“8” position has the largest ow, is most stable and
easiest for startup, however, using the “8” position
is not necessary. The “0” setting has the smallest
(minimum) ow passage; at no point of rotation will the
Type 112 restrictor be completely shut o󰀨. After initial
adjustment, the restrictor does not need to be adjusted
for maintenance or startup.
Note
Mineral, dirt and sediments may gradually
deposit and build up inside the spaces
of the restrictor. This may cause the
unit response to get slower and unit
performance to decrease. If clogging of the
restrictor is suspected, immediately check
and clean the restrictor. Regular inspection
of the restrictor is recommended to
ensure optimum performance. Refer to the
Type 112 Restrictor Maintenance section.
Likewise, debris in the process uid
may clog the restrictor. Install strainer
upstream of the regulator to prevent
debris from clogging the restrictor.
Regular inspection, maintenance and
cleaning of the strainer is recommended
to ensure optimum performance.
Recommended Type 112 Restrictor
Setting Guide (Figure 5)
This guide can be used to adjust performance
according to application conditions. The recommended
initial setting is 4.
Shutdown
If pilot supply pressure is shut down
rst, the downstream system may be
subjected to full inlet pressure.
1. If the pilot setting must be disturbed, be sure to
keep some tension on the spring. This will prevent
trapping inlet pressure during blow down.
2. Close the valves shown in Figure 3, in the
following order:
a. Inlet block valve
b. Outlet block valve
c. Control line valve(s), if used
3. Open the vent valves to depressurize the system.
Maintenance
Regulator parts are subject to normal wear and
must be inspected periodically and replaced as
necessary. Due to the care Emerson takes in meeting
all manufacturing requirements (heat treating,
dimensional tolerances, etc.), use only replacement
parts manufactured or furnished by Emerson. Also,
when lubrication is required, use a good quality
lubricant and lightly coat the recommended part.
The frequency of inspection and parts replacement
depends upon the severity of service conditions,
applicable codes and government regulations and
company inspection procedures. Table 8 lists possible
regulator issues and solutions for them.
Type LR125 Main Valve Trim Parts
Instructions are given for complete disassembly and
assembly. The main valve may remain in the pipeline
during maintenance procedures. Key numbers are
referenced in Figures 10 through 14.
Avoid personal injury or damage
to property from sudden release of
pressure or uncontrolled process uid.
Before starting to disassemble, carefully
release all pressures according to the
Shutdown procedure. Use gauges to
monitor inlet and outlet pressures while
releasing these pressures.
Disassembly
Disassembly of Type LR125:
1. Shutdown, isolate and depressurize the main valve
and pilot according to the shutdown procedure.
2. Remove the cap screws (key 3). Lift up and
remove the bonnet (key 2) from the body (key 1).

Type LR125
10
CAUTION
W7394
Provide adequate support to the bonnet
when disassembling Type LR125 regulator
installed in a vertical installation or
other application where the bonnet is
not oriented upward. Without adequate
support, the bonnet may fall and cause
physical injury when the cap screws
are loosened.
3. Remove the diaphragm (key 9) and plug (key 11)
assembly and bonnet O-ring (key 28).
4. Pull out the cage (key 7), O-ring (key 8) and
inlet strainer (key 23).
5. Clean parts and replace if necessary.
Assembly
1. Install the inlet strainer (key 23) into the body (key 1).
Note
When installing in a vertical orientation,
apply lubricant to the bottom of the inlet
strainer (key 23) to help hold parts in
place while installing cage.
2. Lightly lubricate and install the cage O-ring (key 8).
3. Apply lubricant lightly to all O-rings or the mating
part before installing them.
4. Install the cage (key 7) and lightly lubricate and
install the bonnet O-ring (key 28).
5. Lubricate the top and bottom of the outer edge
(bead area) of the diaphragm (key 9) and place
diaphragm and plug (key 11) assembly on the
cage (key 7).
6. Lubricate the top plug O-ring (key 14).
7. If travel indicator was removed, lightly lubricate
the travel indicator assembly threads (key 19)
and screw it into the bonnet (key 2). See Travel
Indicator Assembly Maintenance for maintenance.
8. Install the bonnet (key 2) in proper orientation.
9. Lubricate cap screws (key 3) and secure the
bonnet (key 2), using an even crisscross pattern. It
may be necessary to push down on bonnet to start
cap screws. Tighten cap screws to proper torque
(see Table 9).
Diaphragm and Plug Assembly
Maintenance
The diaphragm and plug assembly can be replaced
as a single unit (a diaphragm cartridge) or individual
components within the assembly can be replaced.
When replacing individual components, inspect each
component for damage and wear and replace parts as
needed. See Figure 9 and Table 7 for the Diaphragm
Markings and Diaphragm Imprint Codes. Key numbers
for the following assembly and disassembly procedure
are referenced in Figures 6 and 12.
1. Place a screwdriver or similar tool through the hole
in the top plug (key 5).
2. Remove the anged hex nut (key 13) from
the bottom plug (key 11). This loosens the
entire assembly.
Note
On 1 in. / DN 25 body remove the socket
head screw (key 129) and lock washer
(key 130) from the bottom plug.
3. Remove the bottom plug (key 11) and the bottom
plug O-ring (key 10).
FLANGED
HEX NUT
(KEY 13)
BOTTOM PLUG
(KEY 11)
DIAPHRAGM
(KEY 9)
TOP PLUG O-RING
(KEY 14)
TOP PLUG
(KEY 5)
O-RING
(KEY 70)
O-RING
(KEY 10)
Figure 6. Diaphragm and Plug Assembly Components

Type LR125
11
!
WARNING
W7400_1
4. Remove the diaphragm (key 9).
5. Remove the top plug O-rings (keys 14 and 70).
6. Check all components for damage or wear and
replace as necessary.
7. When reassembling, be sure to lubricate all
O-rings before installing and add a thread locking
compound to the threads of the top plug.
8. Reassemble in the reverse order. Hold the top
plug (key 5). Place the parts on the top plug in the
following order:
• O-ring (key 14)
• O-ring (key 70)
• Diaphragm (key 9)
• O-ring (key 10)
• Bottom Plug (key 11)
• Flanged Hex Nut (key 13) [On 1 in. / DN 25
body, lock washer (key 130) then socket head
screw (key 129)]
9. Tighten anged hex nut (key 13) to proper torque
(see Table 9).
10. Completely reassemble the unit according to the
assembly procedures provided on page 9.
Travel Indicator Assembly Maintenance
Travel indicator assembly key numbers are referenced
in Figures 7, 10 and 14. The indicator assembly
can be removed and installed without removing the
bonnet (key 2) from the body (key 1). Travel indicator
maintenance is performed for two reasons:
a. When damaged or worn parts need replacing.
b. When travel indicator is removed and replaced with
a travel indicator plug assembly.
Avoid personal injury or damage
to property from sudden release of
pressure or uncontrolled process
uid. Before starting to disassemble,
carefully release all pressures
according to the shutdown procedure.
Use gauges to monitor inlet, loading
and outlet pressures while releasing
these pressures.
1. Remove the indicator protector (key 22, Figure 10)
and indicator cover (key 21).
2. Remove the rst hex nut (key 4) and the indicator
washer (key 20).
3. Unscrew but do not completely remove the second
hex nut (key 4) on the top of the indicator stem
(key 15).
4. Use a wrench to remove indicator tting (key 19).
5. Lift out travel indicator assembly. If replacing travel
indicator with travel indicator plug, skip to step 9.
6. Compress the main spring (key 12). Remove the
second hex nut (key 4). Parts will separate easily
when the hex nut is removed.
7. Slide the indicator stem (key 15) out of the
indicator tting (key 19). The main spring (key 12)
and upper spring seat (key 17) will disengage.
8. If necessary, use the indicator stem (key 15) to pry
the back-up rings (key 16) and O-ring (key 18) out
of the indicator tting (key 19).
9. Check the indicator tting O-ring (key 6). Lubricate
and replace if necessary.
10. To replace travel indicator parts, lubricate all
O-rings, back-up rings and threads. To reassemble,
hold the indicator stem (key 15) and place the parts
on the stem in the following order (see Figure 7).
INDICATOR COVER
(KEY 21)
HEX NUTS
(KEY 4)
INDICATOR FITTING
(KEY 19)
O-RING
(KEY 18)
UPPER SPRING
SEAT (KEY 17)
MAIN SPRING
(KEY 12)
INDICATOR STEM
(KEY 15)
BACK-UP
RINGS
(KEY 16)
INDICATOR
O-RING (KEY 6)
INDICATOR
WASHER (KEY 20)
Figure 7. Travel Indicator Parts

Type LR125
12
!
WARNING
• Main Spring (key 12), small end rst
• Upper Spring Seat (key 17), make sure to place
the large end toward the spring
• First Back-up Ring (key 16)
• O-ring (key 18)
• Second Back-up Ring (key 16)
• Indicator Fitting (key 19), the back-up rings
(key 16) and O-ring (key 18) should slide into
the indicator tting and the small end of the
upper spring seat (key 17) should slide into the
indicator tting.
• First Hex Nut (key 4)
• Indicator Washer (key 20)
• Second Hex Nut (key 4)
11. Install the indicator tting (key 19) into the bonnet
(key 2, Figure 10), tighten to the proper torque
(see Table 9). To set the travel indicator, hold
the indicator cover (key 21) next to the indicator
tting (key 19). Screw the hex nuts (key 4) and the
indicator washer (key 20) down on the indicator
stem (key 15) until the washer is even with the
lowest marking on the indicator cover. Lightly
lubricate the indicator cover threads and install.
Replace the indicator protector (key 22). To replace
the travel indicator with the non-travel indicator
option, place the main spring (key 12) into the
bonnet. Install the indicator plug (key 19, Figure 14)
and tighten to proper torque (see Table 9).
Type MR95H/MR95HP Pilot Maintenance
To avoid personal injury, property
damage or equipment damage caused
by sudden release of pressure or
uncontrolled process uid, do not
attempt any maintenance or disassembly
without rst isolating the regulator
from system pressure and relieving all
internal pressure from the regulator.
Regulators that have been disassembled
for repair must be tested for proper
operation before being returned to
service. Only parts manufactured by
Emerson should be used for repairing
Fisher™ regulators.
Due to normal wear that may occur, parts must be
periodically inspected and replaced as necessary.
The frequency of inspection depends on the severity
of service conditions or the requirement of local,
state and federal rules and regulations. This section
includes instructions for disassembly and replacement
of parts. All key numbers refer to Figure 15.
1. Unscrew the valve plug guide (key 5) from the
body (key 1). The valve plug spring (key 26) and
the valve plug (key 4) will normally come out of the
body along with the valve plug guide.
2. Inspect the seating surface of the valve plug
(key 4), make sure that the elastomer or polished
metal surface of the valve plug is not damaged.
Replace if damage is noted.
3. Inspect the seating edge of the orice (key 3).
If damage is noted, unscrew the orice from the
body (key 1). Reference Table 10 for proper torque
values. If no further maintenance is required,
reassemble the regulator in the reverse of the
above steps. When installing the valve plug guide
(key 5) coat the threads and sealing surface with
sealant to ensure an adequate metal-to-metal
seal. Reference Table 10 for proper torque values.
4. If diaphragm damage is suspected, or to inspect
the diaphragm or other internal parts, loosen the
jam nut (key 17) and turn the adjusting screw
(key 15) to remove all spring compression.
5. Remove the diaphragm case cap screws (key 16)
and lift o󰀨 the spring case (key 2). Remove the
upper spring seat (key 9) and regulator spring
(key 11). Remove the lower spring seat (key 8).
6. Remove the diaphragm (key 12) and examine for
damage. Replace if damage is noted.
7. Unscrew and remove the stem guide bushing
(key 7).
8. With diaphragm (key 12) removed, check to be
sure the pressure registration hole is completely
open and free of obstructions.
9. Reassemble in the reverse of the above
procedures. Lubricate the upper spring seat
(key 9) and the exposed threads of the adjusting
screw (key 15) with anti-seize lubricant.
10. Before tightening cap screws (key 16) be sure to
install the adjusting screw, if completely removed,
and turn it clockwise to ensure proper slack in the
diaphragm (key 12). This allows proper positioning
of the diaphragm to permit full travel of the valve
plug (key 4). Torque diaphragm cap screws per
Table 10. Complete reassembly procedures and
turn the adjusting screw (key 15) to produce
the desired outlet pressure. Tighten the jam nut
(key 17) to maintain the desired setting.

1
1
1
1
1
1
11
Type LR125
13
W4573
Figure 8. Pushing Groove Valve Up With Retainer
ELASTOMER/FABRIC
MATERIAL
CODE
THICKNESS
CODE
YEAR OF MANUFACTURE
RADIAL LOCATION
TO LOCATE
IMPRINT CODE
DOME IDENTIFICATION
THICKNESS INK CODE
(USE ONE LOCATION ONLY)
MANUFACTURER
CODE
MATERIAL
INK CODE
LOCATE INK CODE
BETWEEN RADII
Figure 9. Diaphragm Markings
Table 7. Diaphragm Imprint Codes
THICKNESS MATERIAL
DIAPHRAGM MATERIAL
Imprint Ink Code Imprint Ink Code
2 130
217E68 17E68 - Nitrile (NBR) (Low minimum di󰀨erential)
4 17E88 17E88 - Fluorocarbon (FKM) (High temperature capability)
517E97 17E97 - Nitrile (NBR) (High erosion resistance)

Type LR125
14
Table 8. Troubleshooting Guide
ISSUE POSSIBLE SOLUTION
Outlet pressure suddenly rises above
setpoint and approaches inlet pressure
• If travel indicator is in UP position, check restrictor and pilot supply lter for plugging.
• If travel indicator is in DOWN position, check main valve for debris or diaphragm damage.
Outlet pressure normal at low ow but
falls below setpoint at high ow
• Check main valve inlet strainer for plugging.
• Check inlet pressure at high ow condition.
• Check sizing calculations to be sure main valve body is large enough for load.
• Check for undersized or restricted control line (use the minimum size given in step 6 of Type LR125
Installation section).
• Adjust restrictor to a lower setting.
Outlet pressure cycles
• Adjust restrictor to a higher setting.
• Check control line placement. Make sure it is not located in a turbulent area.
• Make sure there is not a restriction in the control line, such as a needle valve.
Fluid leaks from pilot spring case • Replace pilot diaphragm assembly.
Fluid leaks from travel indicator • Replace indicator stem O-ring, if indicator is not desired, convert to a non-travel indicator assembly.
Outlet pressure approaches inlet
pressure when no ow is desired
• Check main valve O-rings for damage or improper installation.
• Check cage and diaphragm surfaces for erosion or trapped debris.
• Check pilot valve plug and seat for seating surface damage or debris.
• Check pilot for trapped debris.
Regulator will not open
• Check for clogged control line.
• Make sure control line is installed and open.
• Check for damage to the main valve diaphragm.
• On new installations, make sure the control line and pilot supply are properly connected.
Regulator will not close
• Make sure the pilot supply is properly connected.
• Check restrictor for clogging.
• Check the main valve diaphragm for damage.
• Check for a broken control line.
High lock-up pressure with slow shutdown • Check for debris on main valve or pilot seat.
High lock-up pressure with fast shutdown • Adjust restrictor to a higher setting.
Note: If you were unable to solve your problem using this troubleshooting guide, contact your local Sales O󰀩ce.
Table 9. Type LR125 Torque Values
BODY SIZE,
In. / DN
CAP SCREWS (KEY 3) OR
HEX NUTS (KEY 47)
FLANGED HEX NUT (KEY 13) OR
SOCKET HEAD SCREW
(KEY 129, 1 IN. / DN 25 ONLY)
INDICATOR FITTING OR
INDICATOR PLUG (KEY 19)
Ft-lbs / N•m
1 / 25 75 to 95 / 102 to 129 4 to 6 / 5.5 to 8 90 to 160 / 122 to 217
2 / 50 55 to 70 / 75 to 95 10 to 14 / 14 to 19 90 to 160 / 122 to 217
3 / 80 100 to 130 / 136 to 176 32 to 40 / 44 to 54 200 to 300 / 271 to 407
4 / 100 160 to 210 / 217 to 285 32 to 40 / 44 to 54 200 to 300 / 271 to 407
Table 10. Type MR95H/MR95HP Pilot Torque Values
BODY SIZE,
In. / DN
SPRING CASE BOLTS (KEY 16) ORIFICE (KEY 3) VALVE PLUG GUIDE (KEY 5)
Ft-lbs / N•m
1/2 / 15 10 to 13 / 14 to 18 34 to 38 / 46 to 51 75 to 90 / 102 to 122

Type LR125
15
Table 11. Type LR125 Main Valve Body Part Numbers (Key 1, Figure 10)
BODY SIZES,
In. / DN BODY MATERIAL END CONNECTION STYLE PART NUMBER
1 / 25
WCC Steel
NPT GE11581X012
SWE GE11440X012
CL150 RF GE11583X012
CL300 RF GE11607X012
CL600 RF GE11608X012
PN 16/25/40 RF GE13625X012
CF8M Stainless Steel
NPT GE11581X022
CL150 RF GE11583X022
CL300 RF GE11607X022
CL600 RF GE11608X022
PN 16/25/40 RF GE13625X022
CF3M Stainless Steel CL150 RF GE11583X032
2 / 50
WCC Steel
NPT GE10588X012
SWE GE10682X012
CL150 RF GE10676X012
CL300 RF GE10678X012
CL600 RF GE10679X012
PN 16/25/40 RF GE12898X012
CF8M Stainless Steel
NPT GE10588X022
CL150 RF GE10676X022
CL300 RF GE10678X022
CL600 RF GE10679X022
PN 16/25/40 RF GE12898X022
CF3M Stainless Steel CL150 RF GE10676X042
3 / 80
WCC Steel
CL150 RF GE10699X012
CL300 RF GE10700X012
CL600 RF GE10701X012
PN 16/25/40 RF GE13594X012
CF8M Stainless Steel
CL150 RF GE10699X022
CL300 RF GE10700X022
CL600 RF GE10701X022
PN 16/25/40 RF GE13594X022
4 / 100
WCC Steel
CL150 RF GE10835X012
CL300 RF GE10839X012
CL600 RF GE10842X012
CF8M Stainless Steel
CL150 RF GE10835X022
CL300 RF GE10839X022
CL600 RF GE10842X022

Type LR125
16
Type 112 Restrictor Maintenance
Avoid personal injury or damage to
property from sudden release of pressure
or uncontrolled process uid. Before
starting to disassemble, carefully release
all pressures according to the shutdown
procedure. Use gauges to monitor inlet,
loading and outlet pressures while
releasing these pressures.
Note
Accumulated dirt, mineral deposit,
clogged debris or sediment buildup
inside the restrictor may cause the
unit response to get slower and unit
performance to decrease. If any of these
is suspected, immediately inspect and
clean the restrictor.
Perform the following procedure if O-rings are
leaking or if there is a need to inspect and remove
accumulated dirt, mineral deposit, clogged debris or
sediment buildup inside the restrictor. Key numbers
are referenced in Figure 16.
1. Unscrew the groove valve (key 22) and retainer
(key 23) just enough to loosen them, but do not
completely separate.
2. As shown in Figure 8, push on the retainer (key 23)
to push the groove valve (key 22) out of the body
(key 21), then complete disassembly.
3. Inspect the gaps and small spaces inside
the restrictor. Check and remove any debris,
accumulated dirt, mineral deposit or sediment
buildup that clogs the restrictor.
4. Replace the groove valve O-rings (key 24) if
necessary, being sure to lightly apply lubricant to
the replacement O-rings before installing them in
the groove valve and retainer.
5. Install the groove valve (key 22) into the same
side of the body where the scale appears. Install
the retainer into the opposite side of the body, and
tighten until both are secure.
6. When all maintenance is complete, refer to the
Startup and Adjustment section to put the regulator
back into operation.
Parts Ordering
When corresponding with your local Sales O󰀩ce about
this equipment, reference the equipment serial number
or FS number found on a nameplate attached to the
bonnet. When ordering replacement parts, reference
the key number of each needed part as found in
the following parts list. Separate kit containing all
recommended spare parts is available.
Parts List
Type LR125 Main Valve (Figures 10 to 14)
Key Description Part Number
Parts Kits
Diaphragm Cartridge and O-rings (Included are keys 5,
6, 8, 9, 10, 11, 13, 14, 16, 18, 28, 70, 129 and 130)
1 in. / DN 25
17E68 Nitrile (NBR) RLR1258N182
17E97 Nitrile (NBR) RLR1258N172
17E88 Fluorocarbon (FKM) RLR1258F182
2 in. / DN 50
17E68 Nitrile (NBR) RLR1258N282
17E97 Nitrile (NBR) RLR1258N272
17E88 Fluorocarbon (FKM) RLR1258F282
3 in. / DN 80
17E68 Nitrile (NBR) RLR1258N382
17E97 Nitrile (NBR) RLR1258N372
17E88 Fluorocarbon (FKM) RLR1258F382
4 in. / DN 100
17E68 Nitrile (NBR) RLR1258N482
17E97 Nitrile (NBR) RLR1258N472
17E88 Fluorocarbon (FKM) RLR1258F482
1 Valve Body See Table 11
2 Bonnet Assembly
1 in. / DN 25 body
Steel 39B2403X022
Stainless steel ERAA00892A1
2 in. / DN 50 body
Steel 38B2122X022
Stainless steel ERAA00893A1
3 in. / DN 80 body
Steel 38B5963X022
Stainless steel ERAA00894A1
4 in. / DN 100 body
Steel 38B2133X022
Stainless steel ERAA00895A1
3 Cap Screw (For Steel Bonnet)
1 in. / DN 25 body (4 required) 1R281124052
2 in. / DN 50 body (8 required) 1A453324052
3 in. / DN 80 body (8 required) 1A454124052
4 in. / DN 100 body (8 required) 1A440224052
4 Hex Nut (For bodies with travel indicator, 2 required)
1 and 2 in. / DN 25 and 50 bodies,
Zinc-plated Carbon steel 1H322228982
3 and 4 in. / DN 80 and 100 bodies,
Stainless steel 1L286338992
5 Top Plug, Stainless steel
1 in. / DN 25 body 29B2404X012
2 in. / DN 50 body 28B2130X012
3 in. / DN 80 body 28B8511X012
4 in. / DN 100 body 28B5964X012
*Recommended spare part.
- continued -
!
WARNING

Type LR125
17
6* O-ring
1 and 2 in. / DN 25 and 50 bodies
Nitrile (NBR) 18B3438X012
Fluorocarbon (FKM) 1N430306382
3 and 4 in. / DN 80 and 100 bodies
Nitrile (NBR) 10A8931X012
Fluorocarbon (FKM) 10A8931X052
7 Cage
1 in. / DN 25 body 39B2413X012
2 in. / DN 50 body 37B9748X012
3 in. / DN 80 body 48B5961X012
4 in. / DN 100 body 48B2135X012
8* Cage O-ring
1 in. / DN 25 body
Nitrile (NBR) 14A5713X012
Fluorocarbon (FKM) 13A2351X012
2 in. / DN 50 body
Nitrile (NBR) 10B4428X012
Fluorocarbon (FKM) 10B4428X022
3 in. / DN 80 body
Nitrile (NBR) 10B4366X012
Fluorocarbon (FKM) 10B4366X022
4 in. / DN 100 body
Nitrile (NBR) 10B4373X012
Fluorocarbon (FKM) 10B4373X022
9* Diaphragm
1 in. / DN 25 body
17E68 Nitrile (NBR), low differential 30C1009X012
17E97 Nitrile (NBR), high erosion GE11960X012
17E88 Fluorocarbon (FKM), high temperature 39B2397X022
2 in. / DN 50 body
17E68 Nitrile (NBR), low differential 29B1909X012
17E97 Nitrile (NBR), high erosion 28B2123X052
17E88 Fluorocarbon (FKM), high temperature 29B2715X012
3 in. / DN 80 body
17E68 Nitrile (NBR), low differential 38B9886X012
17E97 Nitrile (NBR), high erosion 39B2726X012
17E88 Fluorocarbon (FKM), high temperature 38B8512X022
4 in. / DN 100 body
17E68 Nitrile (NBR), low differential 38B8509X012
17E97 Nitrile (NBR), high erosion 39B3996X012
17E88 Fluorocarbon (FKM), high temperature 39B1154X012
10* O-ring
1 and 2 in. / DN 25 and 50 bodies
Nitrile (NBR) 1E216306992
Fluorocarbon (FKM) 1L949306382
3 and 4 in. / DN 80 and 100 bodies
Nitrile (NBR) 1J4888X0052
Fluorocarbon (FKM) 1J4888X0032
11 Bottom Plug, Stainless steel
1 in. / DN 25 body 19B2407X012
2 in. / DN 50 body 18B2127X012
3 in. / DN 80 body 18B8513X012
4 in. / DN 100 body 18B5966X012
12 Main Valve Spring, Stainless steel
1 in. / DN 25 body, Black and Yellow GE12727X022
2 in. / DN 50 body, Green and White 18B2126X022
3 in. / DN 80 body, Light Blue and White 19B0781X022
4 in. / DN 100 body, Green and White 18B8501X022
13 Flanged Hex Nut, Stainless steel
2 in. / DN 50 body ERAA00905A0
3 and 4 in. / DN 80 and 100 bodies GG01972X012
14* Top Plug O-ring
1 and 2 in. / DN 25 and 50 bodies
Nitrile (NBR) 13A1584X052
Fluorocarbon (FKM) 13A1584X022
3 and 4 in. / DN 80 and 100 bodies
Nitrile (NBR) 10A3803X062
Fluorocarbon (FKM) 10A3803X032
15 Stem, Stainless steel (For bodies with travel indicator)
1 and 2 in. / DN 25 and 50 bodies T14185T0012
3 and 4 in. / DN 80 and 100 bodies T21074T0012
16* Back-up Ring, PTFE
(For bodies with travel indicator, 2 required)
1 and 2 in. / DN 25 and 50 bodies 1N659106242
3 and 4 in. / DN 80 and 100 bodies 1J418806992
17 Upper Spring Seat, Stainless steel
(For bodies with travel indicator)
1 and 2 in. / DN 25 and 50 bodies 18B2129X012
3 and 4 in. / DN 80 and 100 bodies 18B5968X012
18* O-ring (For bodies with travel indicator)
1 and 2 in. / DN 25 and 50 bodies
Nitrile (NBR) 1H2926X0032
Fluorocarbon (FKM) 1H2926X0022
3 and 4 in. / DN 80 and 100 bodies
Nitrile (NBR) 1D191706992
Fluorocarbon (FKM) 1N423906382
19 Indicator Fitting, Stainless steel
(For bodies with travel indicator)
1 and 2 in. / DN 25 and 50 bodies 28B2128X012
3 and 4 in. / DN 80 and 100 bodies 28B5969X012
19 Travel Indicator Plug, Stainless steel
(For bodies without travel indicator)
1 in. / DN 25 body 19B2409X012
2 in. / DN 50 body GE17585X012
3 and 4 in. / DN 80 and 100 bodies 28B5970X012
20 Indicator Washer (For bodies with travel indicator)
1 and 2 in. / DN 25 and 50 bodies 18B2138X012
3 and 4 in. / DN 80 and 100 bodies 18B8503X012
21 Indicator Cover, Plastic
(For bodies with travel indicator)
1 and 2 in. / DN 25 and 50 bodies T14188T0012
3 and 4 in. / DN 80 and 100 bodies 19B2270X012
22 Indicator Protector, Plastic
(For bodies with travel indicator)
1 and 2 in. / DN 25 and 50 bodies 24B1301X012
3 and 4 in. / DN 80 and 100 bodies 29B2269X012
23 Inlet Strainer, Stainless steel
1 in. / DN 25 body 20B8004X012
2 in. / DN 50 body 10B4409X012
3 in. / DN 80 body 20B4367X012
4 in. / DN 100 body 20B4374X012
24 Nameplate - - - - - - - - - - -
25 Flow Arrow - - - - - - - - - - -
26 Drive Screw, Stainless steel
1 in. / DN 25 body (4 required) 1A368228982
2, 3 and 4 in. / DN 50, 80 and 100 (5 required) 1A368228982
28* O-ring
1 in. / DN 25 body
Nitrile (NBR) 19B2838X012
Fluorocarbon (FKM) 19B2838X022
2 in. / DN 50 body
Nitrile (NBR) 18B2124X012
Fluorocarbon (FKM) 18B2124X022
3 in. / DN 80 body
Nitrile (NBR) 18B8514X012
Fluorocarbon (FKM) 18B8514X022
4 in. / DN 100 body
Nitrile (NBR) 18B2140X012
Fluorocarbon (FKM) 18B2140X022
*Recommended spare part.
Key Description Part Number
Key Description Part Number
Type LR125 Main Valve
(Figures 10 to 14) (continued)
- continued -

Type LR125
18
29 Pipe Nipple
Steel - - - - - - - - - - -
Stainless steel - - - - - - - - - - -
44 Vent (Type Y602-12) 27A5516X012
45 Bushing
Steel - - - - - - - - - - -
Stainless steel - - - - - - - - - - -
47 Hex Nut (not shown)
For Stainless steel Bonnet, Stainless steel
1 in. / DN 25 body (4 required) 1C330635252
2 in. / DN 50 body (8 required) 1A377235252
3 in. / DN 80 body (8 required) 1A376035252
4 in. / DN 100 body (8 required) 1A352035252
For Steel Bonnet, Steel
1 in. / DN 25 body (4 required) 1C3306X0832
2 in. / DN 50 body (8 required) 1A3772X0892
3 in. / DN 80 body (8 required) 1A3760X0832
4 in. / DN 100 body (8 required) 1A3520X0922
63 Pipe Plug, Steel/Stainless steel
Standard Piping (3 required) - - - - - - - - - - -
Pre-piped Pilot Supply (2 required) - - - - - - - - - - -
70* O-ring
1 and 2 in. / DN 25 and 50 bodies
Nitrile (NBR) 13A1584X052
Fluorocarbon (FKM) 13A1584X022
3 and 4 in. / DN 80 and 100 bodies
Nitrile (NBR) 10A3803X062
Fluorocarbon (FKM) 10A3803X032
129 Socket Head Screw, Stainless steel
For 1 in. / DN 25 body only 1D6170X0012
130 Lock Washer, Stainless steel
For 1 in. / DN 25 body only 1A3291X0012
136 Stud (not shown)
For Stainless steel bonnet, Stainless steel
1 in. / DN 25 body (4 required) 1R284835222
2 in. / DN 50 body (8 required) 1K242935222
3 in. / DN 80 body (8 required) 1A378135222
4 in. / DN 100 body (8 required) 1R369035222
For Steel Bonnet, Steel
1 In. / DN 25 body (4 required) 1R2848X0752
2 In. / DN 50 body (8 required) 1K2429X0782
3 In. / DN 80 body (8 required) 1A3781X0562
4 In. / DN 100 body (8 required) 1R3690X0592
Type MR95H/MR95HP Pilot (Figure 15)
Key Description Part Number
Parts Kit (Included are keys 3, 4, 10 and 12)
Neoprene (CR) diaphragm and
Nitrile (NBR)/Brass Disk RMR95HX0052
Neoprene (CR) diaphragm and
Nitrile (NBR)/416 Stainless Steel Disk RMR95HX0062
1 Regulator Body, 1/2 NPT
WCC Steel GF04837X022
Stainless steel GF04837X052
2 Spring Case, 1/4 Tapped Vent
WCC Steel ERAA01886A0
Stainless steel ERAA01886A1
3* Orice, Stainless steel GF05327X022
4* Valve Plug Assembly
Nitrile (NBR) Seat
Type MR95H ERCA00635A4
Type MR95HP ERAA01905A0
Fluorocarbon (FKM) Seat
Type MR95H ERCA00635B0
Type MR95HP ERAA01905A3
5 Valve Plug Guide, Stainless steel GF05519X022
6 Stem Assembly, Stainless steel ERAA01904A0
7 Stem Guide Bushing, Stainless steel ERCA03694A0
8 Lower Spring Seat, Stainless steel
Type MR95H 1E3954X0042
Type MR95HP ERCA00436A1
9 Upper Spring Seat
Type MR95H
Zinc-plated carbon steel ERCA00823A0
Stainless steel ERCA00823A1
Type MR95HP
Steel ERCA00382A0
Stainless steel ERCA00382A1
11 Regulator Spring
15 to 30 psig / 1.0 to 2.1 bar, Yellow ERCA04288A0
25 to 75 psig / 1.7 to 5.2 bar, Green ERAA01910A0
70 to 150 psig / 4.8 to 10.3 bar, Red ERAA01911A0
15 to 100 psig / 1.0 to 6.9 bar, Unpainted ERCA04294A0
80 to 400 psig / 5.5 to 27.6 bar, Unpainted ERCA04293A0
12* Diaphragm
Neoprene (CR) ERCA00507A0
Fluorocarbon (FKM) (2 required) ERCA00507A1
13 Nameplate (not shown) - - - - - - - - - - -
15 Adjusting Screw
Zinc-plated Carbon steel (standard) GF05553X012
Stainless steel GF05553X022
16 Cap Screw (8 required)
Type MR95H
Zinc-plated steel (standard) ERCA00100A0
Stainless steel ERCA00100A1
Type MR95HP
Steel ERCA00100A2
Stainless steel ERCA00100A3
17 Jam Nut
Zinc-plated steel (standard) ERCA00380A0
Stainless steel ERCA00380A1
18 Nameplate Drive Screw (4 required)
Stainless steel (not shown) ERAA01884A0
26 Inner Valve Spring, Stainless steel ERCA04282A0
63 Bottom Plug Seal
Nitrile (NBR) ERCA03016A0
Fluorocarbon (FKM) ERCA03016A1
Type 112 Restrictor (Figure 16)
Key Description Part Number
14 Pipe Plug, Stainless steel 1A767535072
21 Restrictor Body, Stainless steel 20B4429X012
22 Groove Valve, Stainless steel 20B4403X012
23 Valve Retainer, Stainless steel 10B4402X012
24* Groove Valve O-ring (2 required),
Nitrile (NBR) 1C853806992
Fluorocarbon (FKM) 1C8538X0052
Pre-piped Pilot Supply (Figure 18)
Key Description Part Number
59 Nipple - - - - - - - - - - -
Steel - - - - - - - - - - -
Stainless steel - - - - - - - - - - -
60 Pipe Elbow
Steel - - - - - - - - - - -
Stainless steel - - - - - - - - - - -
61 Tube Connector (2 required)
Steel - - - - - - - - - - -
Stainless steel - - - - - - - - - - -
62 Tubing, Stainless steel - - - - - - - - - - -
*Recommended spare part.
Type MR95H/MR95HP Pilot
(Figure 15) (continued)
Key Description Part NumberKey Description Part Number
Type LR125 Main Valve
(Figures 10 to 14) (continued)

20
19
17
6
2
14
5
70
10
11
7
8
24
26
3
25
21
15
4
22
12
28
1
23
9
16
63
18
L1
L1
L1
L2
L2
L1
L1
130
129
Type LR125
19
49B6019_A MAIN VALVE ASSEMBLY FOR 1 IN. / DN 25 BODY SIZE
APPLY LUBRICANT(1):
L1 = LITHIUM POLYMER TYPE LUBRICANT (MULTI-PURPOSE GREASE)
L2 = ANTI-SEIZE LUBRICANT
1. Lubricants must be selected such that they meet the temperature requirements.
Figure 10. Type LR125 Main Valve

21
20
19
17
22
15
4
6
18
16
63
12
28
9
13
1
23
2
14
70
10
11
5
7
8
L1
L1
L1
L1
S
L2
S
L2
Type LR125
20
48B2142_C
MAIN VALVE ASSEMBLY FOR 2, 3 AND 4 IN. / DN 50, 80 AND 100 BODY SIZES
APPLY LUBRICANT / SEALANT(1):
L1 = LITHIUM POLYMER TYPE LUBRICANT (MULTI-PURPOSE GREASE)
L2 = ANTI-SEIZE LUBRICANT
S = MEDIUM STRENGTH THREADLOCKER
1. Lubricants and sealant must be selected such that they meet the temperature requirements.
Figure 10. Type LR125 Main Valve (continued)