Emerson MR98 Series User manual

P1757_1
P1753_1
D-A-CH Region Only
MR98 Series Backpressure Regulators and
Relief Valves – AD2000 Compliant
Figure 1. Typical MR98 Series Backpressure Regulators and Relief Valves
TYPE MR98H WITH FLANGE END CONNECTION
TYPE MR98H
April 2022
MR98 Series AD2000 Compliant
Instruction Manual
D104615X012

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MR98 Series AD2000 Compliant
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Specications
This section lists the specications for the MR98 Series Regulators. Factory specication such as type, maximum
inlet pressure, maximum temperature, maximum outlet pressure, spring range, orice size and seat material are
stamped on the nameplate fastened on the regulator at the factory.
1. The pressure/temperature limits in this Instruction Manual and any applicable standard limitation should not be exceeded.
2. Pressure and/or the body end connection may decrease the maximum temperatures.
Available Constructions
Type MR98H: Backpressure regulator/relief valve
for spring settings range from 5 to 200 psig /
0.34 to 13.8 bar.
Type MR98HH: Backpressure regulator/relief
valve for spring settings range from 150 to
375 psig / 10.3 to 25.9 bar.
Body and Orice Sizes
1/2 in. / DN 15: 0.416 in. / 10.56 mm
3/4 and 1 in. / DN 20 and 25:
0.631 in. / 16.02 mm
1-1/2 and 2 in. / DN 40 and 50:
1.142 in. / 29 mm
Body End Connections
See Tables 1
Set Pressure Ranges(1)
See Table 2
Maximum Cold Working Pressures of Body Size
and Materials(1)
See Table 3
Maximum Inlet, Outlet and Spring Case
Pressure Ratings(1)
See Table 3
Maximum Temperature Ranges of Diaphragm, Seat,
Trim and Body Materials(1)(2)
See Table 4
Flow Coe󰀩cients
IEC Sizing Coe󰀩cients
Pressure Registration
Internal or External
Shuto󰀨 Classication Per ANSI/FCI 70-3-2004
Metal Seats: Class IV
Polytetrauoroethylene (PTFE): Class IV
Elastomer Seats: Class VI or better
Sour Gas Service Capability
Optional materials are available for applications
handling sour gases. These constructions comply
with the recommendations of NACE International
Standards MR0175-2002, NACE MR0103 and/or
NACE MR0175/ISO 15156.
API 614 Compliant
Steel or Stainless steel constructions with
Stainless steel trim meet API 614 Requirements.
Approximate Weights
MR98H Series:
1/2 in. / DN 15: 10 lbs / 4.5 kg
3/4 and 1 in. / DN 20 and 25: 22 lbs / 10 kg
1-1/2 and 2 in. / DN 40 and 50: 55 lbs / 25 kg
BODY SIZE CvCgC1
NPS DN
1/2 15 3.4 120 35.3
3/4 and 1 20 and 25 6.5 250 38.5
1-1/2 and 2 40 and 50 20.0 780 39.0
BODY SIZE XTFdFLKm
NPS DN
1/2 15 0.787 0.78 0.94 0.88
3/4 and 1 20 and 25 0.935 0.70 0.91 0.83
1-1/2 and 2 40 and 50 0.961 0.69 0.94 0.88

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Table 1. Types MR98H and MR98HH Regulators Body Constructions
BODY SIZE BODY CONSTRUCTION END CONNECTION STYLE BODY MATERIAL
1.4408 Stainless Steel(1)
1/2 in. / DN 15
Without Control Line and Gauge Port
G Thread
SWE
Welded CL150 RF
Welded CL300 RF
Welded PN 16/25/40 RF
Integral CL150 RF
Integral CL300 RF
Integral PN 16/25/40 RF
With Control Line but Without Gauge Port
G Thread
Welded CL150RF
Welded CL300RF
3/4 in. / DN 20
Without Control Line and Gauge Port
G Thread
SWE
Welded CL150 RF
Welded CL300 RF
Welded PN 16/25/40 RF
With Control Line but Without Gauge Port
G Thread
Welded CL150 RF
Welded CL300 RF
With Gauge Port but Without Control Line
G Thread
Welded CL150 RF
Welded CL300 RF
Welded PN 16/25/40 RF
1 in. / DN 25
Without Control Line and Gauge Port
G Thread
SWE
Welded CL150 RF
Welded CL300 RF
Welded PN 16/25/40 RF
Integral CL150 RF
Integral CL300 RF
Integral PN 16/25/40 RF
With Control Line but Without Gauge Port
G Thread
Welded CL150 RF
Welded CL300 RF
With Gauge Port but Without Control Line
G Thread
Welded CL150 RF
Welded CL300 RF
Welded PN 16/25/40 RF
- Shaded areas indicate that the construction is available.
- Blank areas indicate that you need to contact your local Sales O󰀩ce for the availability of the constructions.
1. Meets the chemical and physical requirements of NACE MR0175-2002, NACE MR0103 and NACE MR0175/ISO 15156.
- continued -

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Table 1. Types MR98H and MR98HH Regulators Body Constructions (continued)
BODY SIZE BODY CONSTRUCTION END CONNECTION STYLE BODY MATERIAL
1.4408 Stainless Steel(1)
1-1/2 in. / DN 40
Type MR98H only
Without control line and gauge port
G Thread
SWE
Welded CL150 RF
Welded CL300 RF
Welded PN 16/25/40 RF
With control line but without gauge port
G Thread
Welded CL150 RF
Welded CL300 RF
With gauge port but without control line
G Thread
Welded CL150 RF
Welded CL300 RF
Welded PN 16/25/40 RF
2 in. / DN 50
Type MR98H only
Without control line and gauge port
G Thread
SWE
Welded CL150RF
Welded CL300RF
Welded PN 16/25/40 RF
Integral CL150 RF
Integral CL300 RF
Integral PN 16/25/40 RF
With control line but without gauge port
G Thread
Welded CL150 RF
Welded CL300 RF
With gauge port but without control line
G Thread
Welded CL150 RF
Welded CL300 RF
Welded PN 16/25/40 RF
- Shaded areas indicate that the construction is available.
- Blank areas indicate that you need to contact your local Sales O󰀩ce for the availability of the constructions.
1. Meets the chemical and physical requirements of NACE MR0175-2002, NACE MR0103 and NACE MR0175/ISO 15156.

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Table 2.MR98 Series Body Sizes, Pressure Ranges and Spring Information
TYPE
BODY SIZE CONTROL
PRESSURE RANGE(1)
SPRING WIRE
DIAMETER
SPRING FREE
LENGTH SPRING MATERIAL(2) SPRING PART
NUMBER SPRING COLOR
NPS DN psig bar In. mm In. mm
MR98H
1/2 15
15 to 35 1.0 to 2.4 0.207 5.26 2.50 63.5 Powder-coated steel(3) ERCA04288A0 Yellow
25 to 75 1.7 to 5.2 0.234 5.94 2.595 65.9 Powder-coated steel(3) ERAA01910A0 Green
70 to 140 4.8 to 9.7 0.283 7.19 2.44 62.0 Powder-coated steel(3) ERAA01911A0 Red
130 to 200 9.0 to 13.8 0.331 8.41 2.250 57.2 Powder-coated steel(3) ERAA02889A0 Blue
3/4
and 1
20
and 25
15 to 35 1.0 to 2.4 0.306 7.77 4.00 102 Powder-coated steel(3) 1E398927022 Yellow
25 to 75 1.7 to 5.2 0.343 8.71 4.00 102 Powder-coated steel(3) 1E399027142 Green
70 to 140 4.8 to 9.7 0.406 10.3 4.00 102 Powder-coated steel(3) 1E399127162 Red
130 to 200 9.0 to 13.8 0.468 11.9 3.75 95.3 Powder-coated steel 1L380127082 Blue
3/4
and 1
20
and 25
15 to 35 1.0 to 2.4 0.306 7.77 4.00 102 Powder-coated Stainless steel 1E3989X0052 Yellow
25 to 75 1.7 to 5.2 0.375 9.53 3.88 98.6 Stainless steel 1K762537022 Unpainted
70 to 140 4.8 to 9.7 0.437 11.1 4.00 102 Stainless steel 11A8269X012 Unpainted
1-1/2
and 2
40
and 50
5 to 35 0.34 to 2.4 0.468 11.9 6.562 167 Powder-coated steel(4) 1E792327092 Dark gray
20 to 65 1.4 to 4.5 0.500 12.7 6.50 165 Powder-coated steel(4) ERCA04290A0 Black with light blue stripe
50 to 100 3.4 to 6.9 0.562 14.3 6.562 167 Powder-coated steel(5) ERAA01893A0 Light gray
75 to 170 5.2 to 11.7 0.625 15.9 6.565 167 Powder-coated steel(5) 1P7888X0022 Black
MR98HH
1/2 15 150 to 375 10.3 to 25.9 0.394 10.0 5.063 129 Powder-coated steel 1N943427142 Unpainted
3/4
and 1
20
and 25 150 to 340 10.3 to 23.4 0.593 15.1 6.380 162 Chromium-silicon steel 1N9441X0022 Light gray
1. All springs may be backed o󰀨 to 0 psig / 0 bar. However, highest capacities and best performances are obtained by using these springs in their recommended ranges.
2. Springs meet NACE MR0175-2002, NACE MR0103 and NACE MR0175/ISO 15156 requirements only for applications in which the spring is not exposed to the sour gas.
3. Available in Inconel®.
4. Spring range changes to 5 to 60 psig / 0.34 to 4.1 bar for the Inconel® option.
5. Spring range changes to 50 to 120 psig / 3.4 to 8.3 bar for the Inconel® option.
Inconel® is a mark owned by Special Metals Corporation.
Table 3. Maximum Cold Working Pressures of Body Size and Materials(1)(2)
REGULATOR
TYPE
BODY SIZE BODY AND SPRING
CASE MATERIALS
MAXIMUM INLET PRESSURE(3) MAXIMUM OUTLET PRESSURE MAXIMUM SPRING
CASE PRESSURE
NPS DN psig bar psig bar psig bar
MR98H 1/2, 3/4, 1,
1-1/2, 2
15, 20, 25,
40, 50 Stainless steel 300 20.7 300 20.7 300 20.7
MR98HH
1/2 15
Stainless steel
400 27.6 400 27.6 400 27.6
3/4, 1 20, 25 340 23.4 340 23.4 340 23.4
1. The pressure/temperature limits in this Installation Manual and any applicable standard limitation should not be exceeded.
2. Temperature, trim material and/or the body end connection may decrease these maximum pressures.
3. Maximum inlet pressure equals set pressure plus build-up.
Table 4. Temperature Capabilities(1)(2)(5)
MATERIAL SEAT DIAPHRAGM O-RING DIAPHRAGM
PROTECTOR
TEMPERATURE
°F °C
Nitrile (NBR)   -40 to 180 -40 to 82
Neoprene (CR) -40 to 180 -40 to 82
Fluorocarbon (FKM)(3)    0 to 300,
Limited to 200°F for hot water
-18 to 149,
Limited to 93°C for hot water
Ethylenepropylene (EPDM)    20 to 275 -7 to 135
Peruoroelastomer (FFKM)   0 to 425 -18 to 218
PTFE -40 to 400 -40 to 204
Metal   -40 to 450 -40 to 232
BODY MATERIAL
TEMPERATURE
°F °C
1.4408 Stainless steel(4) -40 to 450 -40 to 232
1. The pressure/temperature limits in this Instruction Manual and any applicable standard limitation should not be exceeded.
2. Pressure and/or the body end connection may decrease these maximum temperatures.
3. Not for use on steam service.
4. Meets API 614 requirements (with Stainless steel trim).

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MR98 Series AD2000 Compliant
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▲ WARNING
Failure to follow these instructions or
to properly install and maintain this
equipment could result in an explosion,
re and/or chemical contamination
causing property damage and personal
injury or death.
Fisher™ backpressure regulators,
relief and relief valves must be
installed, operated and maintained
in accordance with federal, state and
local codes, rules and regulations and
Emerson instructions.
If a leak develops or if the outlet
continually vents gas, service to the
unit may be required. Failure to correct
trouble could result in a hazardous
condition. Only a qualied person shall
install or service the unit.
Installation, operation and maintenance
procedures performed by unqualied
person may result in improper adjustment
and unsafe operation. Either condition
may result in equipment damage or
personal injury. Call a qualied person
when installing, operating and maintaining
the MR98 Series Backpressure Regulators,
Relief and Relief Valves.
Introduction
Scope of the Manual
This manual provides instructions for the installation,
adjustment, maintenance and parts ordering
information of MR98 Series Backpressure Regulators
and Relief Valves. Instructions and parts lists for other
equipment mentioned in this Instruction Manual are
found in separate manuals.
Product Description
The MR98 Series Backpressure Regulator and Relief
Valves are suitable for multiple uid mediums including
liquid, gas, air and steam services. Typical applications
include use in but not limited to wash tanks, small
heaters, fuel and oil lines, air supply system, test
xtures and sterilizers.
Backpressure Regulator / Pressure Relief Valve—
Types MR98H and MR98HH Regulators are
direct-operated backpressure regulator/relief valve for
pressure control requiring constant outlet pressures
between 2 to 375 psig / 0.14 to 25.9 bar.
See Tables 1 through 4 for detailed breakdown of the
various construction o󰀨erings.
Principle of Operation
Relief or backpressure valves respond to changes in
upstream pressure. Pressure changes register under
the diaphragm (see Figure 2) through a registration hole
in the valve body or through an external control line.
When the pressure increases above the spring setting,
the pressure underneath the diaphragm overcomes the
spring compression. This causes the valve plug to move
away from the orice. The ow path through the valve
is open and excess pressure is vented. When upstream
pressure drops below setpoint, the valve closes.
Installation
▲ WARNING
Personal injury or system damage may
result if this backpressure regulator or
relief valve is installed where service
conditions could exceed the limits given
on the Specications section and/or
regulator nameplate.
Additionally, physical damage to the
backpressure regulator or relief valve
may result in personal injury or property
damage due to escaping of accumulated
gas. To avoid such injury and damage,
install the backpressure regulator or
relief valve in a safe location.
Under enclosed conditions or indoors,
escaping gas may accumulate and be an
explosion hazard. In this case, the vent
should be piped outdoors.
For regulator constructions with a
spring case vent, the vent should be
kept open to permit free ow of gas
to the atmosphere. Protect openings
against entrance of rain, snow, insects
or any other foreign material that may
plug the spring case vent or vent line.

INLET PRESSURE
OUTLET PRESSURE
ATMOSPHERIC PRESSURE
M1240_12/2019 M1239_12/2019
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MR98 Series AD2000 Compliant
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ADJUSTING SCREW
CONTROL SPRING
VENT
DIAPHRAGM
VALVE PLUG
ORIFICE
CONTROL LINE TAP
1/2 in. / DN 15 TYPE MR98H
WITH EXTERNAL
PRESSURE REGISTRATION
TYPE MR98H WITH INTERNAL
PRESSURE REGISTRATION
SIDE AND INTERNAL VIEW OF
3/4 TO 2 in./ DN 20 TO 50
TYPE MR98H WITH EXTERNAL
PRESSURE REGISTRATION
METAL DIAPHRAGMS
SPRING
GASKET
FOR TYPE MR98H WITH TWO METAL DIAPHRAGMS
(ALSO TYPICAL OF TYPE MR98HH)
ATMOSPHERIC PRESSURE
OUTLET PRESSURE
INLET PRESSURE
Figure 2. MR98 Series Operational Schematics

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MR98 Series AD2000 Compliant
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Overpressure Protection
▲ WARNING
Overpressuring any portion of
this equipment may result in
equipment damage, leaks in the
relief valve/backpressure regulator
or personal injury due to bursting of
pressure-containing parts.
Relief or backpressure ranges are from 2 to 375 psig /
0.14 to 25.9 bar. The individual spring range of your
valve is stamped on the nameplate.
Maximum inlet pressure depends upon body
materials and temperatures. See Specications
section or the maximum inlet pressure of the valve.
The valve should be inspected for damage after any
overpressure condition.
Vents and Relief Valve Outlet
▲ WARNING
If using an MR98 Series Backpressure
Regulator or Relief Valve on hazardous
or ammable gas service, personal
injury and property damage could occur
due to re or explosion of vented gas
that may have accumulated.
To prevent such injury or damage,
provide piping or tubing to vent the
gas to a safe, well-ventilated area. All
vents should be kept open to permit free
ow of gas to the atmosphere. Protect
openings against entrance of rain, snow,
insects or any other foreign material that
may plug the vent or vent line.
If remote venting is necessary, a tapped vent in the
spring case is available. Install remote vent lines in the
spring case and outlet openings. The vent lines must
have the largest practical diameter and be as short as
possible with a minimum number of bends or elbows.
Install the vent line according to applicable federal, state
and local codes and regulations.
Startup
Note
The Specications section and
Table 3 show the maximum inlet and
di󰀨erential pressures for specic
constructions. Use pressure gauges
to monitor inlet pressure, outlet
pressure and any loading pressure
during startup.
Key numbers are shown in Figures 3 through 5.
1. Check that proper installation is completed and
downstream equipment has been properly adjusted.
2. Make sure all block and vent valves are closed.
3. Decompress the control spring by turning
the adjusting screw (for Types MR98H and
MR98HH) counterclockwise.
4. Slowly open the valves in the following order:
a. Loading supply and control line valve(s), if used
b. Inlet block valve
c. Outlet block valve
5. Set the regulator to the desired set pressure
according to the Adjustment procedure.
Adjustment
Each unit is factory set for the pressure setting
specied on the order or at the mid-point of the spring
range. The allowable spring range is stamped on the
nameplate. If a pressure setting beyond the indicated
range is required, replace with the appropriate spring.
Be sure to label the regulator/valve to indicate the new
pressure range.
Before installing the regulator:
• Unpack the backpressure regulator or relief valve
and remove the protective shipping plugs from
the end connections of the body and the pressure
connection in the spring case.
• Check the backpressure regulator or relief valve
and make sure it has not been damaged or
collected foreign material during shipping.
• Remove any debris or dirt in the tubing and
the pipeline.
• Apply pipe compound to the external pipe thread
for NPT bodies or use appropriate gaskets for
anged bodies.
• Make sure gas ow through the backpressure
regulator or relief valve is in the same direction as
the arrow on the body.

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MR98 Series AD2000 Compliant
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Always use a pressure gauge to monitor pressure
when making adjustments.
All MR98 Series Regulator springs can be backed o󰀨
to zero pressure. Recommended set pressure ranges
available, maximum inlet pressures and temperatures
and color codes of the respective springs are shown in
the Specications section and Table 2.
Types MR98H and MR98HH
1. Loosen the jam nut (key 17, Figures 3, 4 and 5).
2. To increase the set pressure or pressure setting,
turn the adjusting screw (key 15) clockwise. Turn
the adjusting screw counterclockwise to decrease
the set pressure or pressure setting.
3. Tighten the jam nut (key 17).
Shutdown
Relief Valve
1. Close the upstream shuto󰀨 valve to the
regulator inlet.
2. Close the downstream shuto󰀨 valve to the
regulator outlet.
3. Slowly open the downstream vent valve to vent
downstream pressure.
4. Leave the downstream vent valve open to vent
inlet pressure and to release all remaining
pressure in the regulator by opening the upstream
vent valve or by turning the adjusting screw
fully counterclockwise.
Backpressure Regulator
1. Close the upstream shuto󰀨 valve to the
regulator inlet.
2. Close the downstream shuto󰀨 valve to the
regulator outlet.
3. To avoid internal damage due to reverse
pressurization of main valve components, bleed
backpressure regulator inlet pressure rst before
bleeding outlet pressure.
Maintenance
▲ WARNING
To avoid personal injury, property
damage or equipment damage caused
by sudden release of pressure or
explosion of accumulated gas, do not
attempt any maintenance or disassembly
without rst isolating the relief valve
or regulator from system pressure and
relieving all internal pressure from the
relief valve or regulator.
To avoid possible personal injury from
spring or pressure-loaded actuator,
make sure that the adjusting screw is
completely backed o󰀨 or the spring case
pressure is vented prior to disassembly.
Otherwise, the spring load or loading
pressure could forcefully eject the
spring case.
Relief valves or 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™ relief valves
and regulators.
Due to normal wear or damage that
may occur from external sources, this
relief valve or backpressure regulator
should be inspected and maintained
periodically. The frequency of inspection
and replacement of parts depends upon
the severity of service conditions or the
requirement of local, state and federal
rules and regulations.
Due to normal wear and damage that may occur from
external sources, relief valve parts such as the O-rings,
gaskets, diaphragm, orice and valve plug should be
inspected periodically and replaced as necessary. The
frequency of inspection and replacement depends upon
the severity of service conditions or the requirements of
state and federal laws.
Instructions are given below for disassembly of
the MR98 Series. These valves do not have to be
removed from the pipeline to inspect internal parts.
Suitable lubricants are indicated on the assembly
drawings. Apply the recommended lubricants as
the relief valve is being reassembled. Refer to
Figures 3 to 5 while servicing the relief valve.

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MR98 Series AD2000 Compliant
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Table 5. Torque Specifications
BODY SIZE SPRING CASE BOLTS(1) ORIFICE VALVE PLUG GUIDE BOTTOM PLUG
NPS DN Ft-lbs N•m Ft-lbs N•m Ft-lbs N•m Ft-lbs N•m
1/2
3/4 and 1
1-1/2 and 2
15
20 and 25
40 and 50
10 to 13
24 to 30
40 to 50
13 to 18
33 to 41
54 to 68
34 to 38
50 to 60
180 to 200
46 to 51
68 to 81
244 to 271
70 to 90
85 to 100
125 to 150
94 to 122
115 to 136
169 to 203
75 to 90
100 to 125
170 to 200
102 to 122
136 to 169
230 to 271
1. Reduce spring case bolt’s torque by 30% when using Ethylenepropylene (EPDM) diaphragms.
Note: Pusher post lock nut (key 31) should be installed with an additional 1/8 to 1/4 turn when washer is at. See step 10 in the “Disassembly to Replace Diaphragm and Seats” section or
detailed instruction.
Flange Cap Screw Torque Inspection
Retorquing of spring case cap screws may be
necessary for some MR98 Series Regulators after a
period of use. Retorque the cap screws as follows:
1. Shut down the relief valve or backpressure
regulator. Refer to Shutdown section for the
proper procedure.
2. Retighten the cap screws (key 16) in a crisscross
pattern. See Table 5 for proper torque values.
3. Follow the Startup section to repressurize the relief
valve or backpressure regulator.
4. Refer to the Disassembly to Replace Diaphragm
and Seats section as needed.
Disassembly to Replace Diaphragm
and Seats
△ CAUTION
Metal diaphragms have thin sharp
edges. To avoid hand cuts, be careful
when handling the diaphragm,
particularly the diaphragm edge.
If the relief valve is leaking, the diaphragm may be
ruptured or the seating surfaces nicked or scratched.
Proceed as follows to inspect or replace the
diaphragm, orice and valve plug.
1. Shut down the backpressure regulator or
relief valve. Refer to Shutdown section for the
proper procedure.
2. For Types MR98H and MR98HH: Relieve
the spring tension by loosening the jam
nut (key 17) and turning the adjusting
screw (key 15) counterclockwise.
3. Remove cap screws (key 16) and lift o󰀨 the
spring case (key 2), upper spring seat (key 9)
and relief valve spring (key 11). Lift out the
diaphragm unit which includes the lock nut
(key 31), lock washer (key 28), pusher post
(key 10), gasket (key 29), lower spring seat (key 8),
diaphragm (key 12), diaphragm head (key 21 for
Type MR98H, 1-1/2 and 2 in. / DN 40 and 50 body
sizes) and valve plug (key 4).
4. Check the orice (key 3) for wear or damage. If it
needs to be replaced, unscrew the valve plug guide
(key 7) and then the orice. The valve plug (key 4)
can be removed by sliding it o󰀨 of the pusher
post (key 10).
5. Place a small amount of sealant on the threads
of the orice (key 3) and valve plug guide (key 7)
and reinstall these to the body (key 1). See
Table 5 for torque specications.
6. To replace the valve plug O-ring (key 53), remove
the machine screw (key 24) and O-ring retainer
(key 25) from the plug. Remove and replace
the O-ring.
7. Separate the remainder of the diaphragm unit
parts. Take the lock nut (key 31) o󰀨 of the pusher
post (key 10). Slide o󰀨 the lock washer (key 28),
lower spring seat (key 8), diaphragm head (key 21
for Type MR98H, 1-1/2 and 2 in. / DN 40 and 50
body sizes), diaphragm (key 12), washer (key 58)
and gasket (key 29).
8. Slip the valve plug (key 4) onto the pusher post
(key 10). Place a gasket (key 29) on the shaft
of the pusher post over the threaded portion
until it rests on the base of the post. If elastomer
diaphragm (key 12) is used, place a metal washer
(key 58) on top of the gasket. For Type MR98H,
1-1/2 to 2 in. / DN 40 to 50 with metal diaphragm,
place another gasket on the shaft of the pusher
post until it rests on the bottom diaphragm head
(key 21), see Figure 4.

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MR98 Series AD2000 Compliant
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Table 6. Number of Diaphragms Required
BODY SIZE TYPE SPRING RANGE DIAPHRAGM MATERIAL NUMBER OF DIAPHRAGM
NPS 1/2 to 2 /
DN 15 to 50 All All
Neoprene (CR) 1
Fluorocarbon (FKM) 2
Ethylenepropylene (EPDM) 1
Metal 2
Note
If a metal diaphragm is to be replaced by
an elastomer diaphragm or an elastomer
diaphragm by a metal diaphragm, a new
pusher post is required. Each diaphragm
material requires a di󰀨erent pusher post
length and make sure the proper number
of metal or elastomer diaphragm that will
be used is followed. Refer to the Parts
List section or Table 6 for the correct
number of diaphragm to be used.
9. See Figures 3 to 5. For the metal diaphragms
(key 12), replace the large diaphragm gasket (key 19)
on the surface of the body (key 1) that will support
the diaphragms. There will be two diaphragms
used per regulator. The raised surfaces of the metal
diaphragms should be placed in the unit so that they
are facing toward the assembler (toward the spring)
except only when one diaphragm is being used then
the raised surface should be facing down (towards
the body) (see Figure 2). For elastomer diaphragms,
the printed side should be facing upwards
when installed.
10. Slip the lower spring seat (key 8) and lock washer
(key 28) back onto the pusher post (key 10).
Lubricate the threads of the pusher post and
tighten the pusher post lock nut (key 31) until
the lock washer is at and then turn the nut an
additional 1/8 to 1/4 turn. Return the diaphragm
(key 12), spring seat and pusher post assembly to
the body (key 1).
Replacement or Maintenance of Bottom
Plug O-ring
If there is any external leakage from the bottom plug,
the bottom plug O-ring could be worn out or damaged.
Proceed as follows to check and/or replace it.
1. Shut down the regulator. Refer to Shutdown
section for the proper procedure.
2. Unscrew the bottom plug (key 5) from the body
(key 1). Inspect the bottom plug seal (key 63)
for damage. Replace the bottom plug seal if
damage is noted. Lightly lubricate the bottom plug
O-ring or graphite ring before installing it onto the
bottom plug.
3. Reassemble the regulator in the reverse order
of the above steps. When installing the bottom
plug (key 5), coat the threads and sealing surface
with anti-seize compound to ensure an adequate
metal-to-metal seal. Reference Table 5 for proper
torque values.
11. Set the relief valve spring (key 11) in the lower
spring seat and place the upper spring seat
(key 9) on the spring.
12. Put the spring case (key 2) over the spring
(key 11) and onto the body (key 1). Tighten the
cap screws (key 16) nger tight only.
13. To ensure proper slack in the diaphragm (key 12),
apply some spring compression by turning the
adjusting screw (key 15) or handwheel (key 38)
clockwise. Finish tightening the cap screws.
See Table 5 for recommended torque values.

12
MR98 Series AD2000 Compliant
D-A-CH Region Only
Parts List
Key Description Part Number
Parts Kit (included are keys 3, 4, 12, 29, 59 and 63)
Types MR98H and MR98HH
With Stainless steel diaphragm and trim
1/2 in. / DN 15 Body Size RMR98HX0052
3/4 and 1 in. / DN 20 and 25 Body Sizes RMR98HX0062
1-1/2 and 2 in. / DN 40 and 50 Body Sizes RMR98HX0082
With Neoprene (CR) diaphragm and
Nitrile (NBR)/416 Stainless steel trim
1/2 in. / DN 15 Body Size RMR98HX0022
3/4 and 1 in. / DN 20 and 25 Body Sizes RMR98HX0032
1-1/2 and 2 in. / DN 40 and 50 Body Sizes RMR98HX0072
1 Body See following tables
2 Spring Case See following tables
3* Orifice
Metal-to-metal seat
1/2 in. / DN 15 Body Size
416 Stainless steel GF04841X022
316 Stainless steel, NACE GF04841X032
Alloy 6, NACE GF04841X062
3/4 and 1 in. / DN 20 and 25 Body Sizes
416 Stainless steel GF04821X022
316 Stainless steel, NACE GF04821X032
Alloy 6, NACE GF04821X062)
1-1/2 and 2 in. / DN 40 and 50 Body Sizes
416 Stainless steel GF04896X022
316 Stainless steel, NACE GF04896X032
Alloy 6, NACE
Composition seat
1/2 in. / DN 15 Body Size
416 Stainless steel GF05552X022
316 Stainless steel, NACE, Oxygen Service GF05552X032
3/4 and 1 in. / DN 20 and 25 Body Sizes
416 Stainless steel GF04824X022
316 Stainless steel, NACE, Oxygen Service GF04824X032
1-1/2 and 2 in. / DN 40 and 50 Body Sizes
416 Stainless steel GF05513X022
316 Stainless steel, NACE, Oxygen Service GF05513X032
4* Valve Plug See following tables
*Recommended Spare Part
1. Part meets NACE requirements only for applications in which the part is not exposed to sour gas.
5 Bottom Plug
1/2 in. / DN 15 Body Size
1.4401/1.4404 Stainless steel, NACE(1) GF05532X222
3/4 and 1 in. / DN 20 and 25 Body Sizes
1.4401/1.4404 Stainless steel, NACE(1) GF05496X212
1-1/2 and 2 in. / DN 40 and 50 Body Sizes
1.4401/1.4404 Stainless steel, NACE(1) GF05511X142
7 Valve Plug Guide
1/2 in. / DN 15 Body Size
416 Stainless steel GF05534X022
316 Stainless steel, NACE, Oxygen Service GF05534X032
3/4 and 1 in. / DN 20 and 25 Body Sizes
416 Stainless steel GF05529X022
316 Stainless steel, NACE, Oxygen Service GF05529X032
1-1/2 and 2 in. / DN 40 and 50 Body Sizes
416 Stainless steel GF05539X022
316 Stainless steel, NACE, Oxygen Service GF05539X032
8 Lower Spring Seat, NACE
Type MR98H
1/2 in. / DN 15 Body Size
Stainless steel 1L3397X0012
3/4 and 1 in. / DN 20 and 25 Body Sizes
Stainless steel 1L3427X0012
1-1/2 and 2 in. / DN 40 and 50 Body Sizes
Stainless steel 1P7877X0012
Type MR98HH
1/2 in. / DN 15 Body Size
Stainless steel 1N9430X0012
3/4 and 1 in. / DN 20 and 25 Body Sizes
Stainless steel 1N9438X0012
9 Upper Spring Seat, NACE
Type MR98H
1/2 in. / DN 15 Body Size
Stainless steel ERCA00823A1
3/4 and 1 in. / DN 20 and 25 Body Sizes
Stainless steel 1E3987X0012
1-1/2 and 2 in. / DN 40 and 50 Body Sizes
Stainless steel 1P7876X0012
Type MR98HH
1/2 in. / DN 15 Body Size
Stainless steel ERCA00430A1
3/4 and 1 in. / DN 20 and 25 Body Sizes
Stainless steel 1N9439X0012
10 Pusher Post
Composition Diaphragm
1/2 in. / DN 15 Body Size
416 Stainless steel ERCA01344A0
316 Stainless steel, NACE, Oxygen Service ERCA01344A1
3/4 and 1 in. / DN 20 and 25 Body Sizes
416 Stainless steel 1L343835132
316 Stainless steel, NACE, Oxygen Service 1L343835072
1-1/2 and 2 in. / DN 40 and 50 Body Sizes
416 Stainless steel 1P788435132
316 Stainless steel, NACE, Oxygen Service 1P788435072
Metal Diaphragm
1/2 in. / DN 15 Body Size
416 Stainless steel ERCA01343A0
316 Stainless steel, NACE, Oxygen Service ERCA01343A1
3/4 and 1 in. / DN 20 and 25 Body Sizes
416 Stainless steel 1L343935132
316 Stainless steel, NACE, Oxygen Service 1L343935072
1-1/2 and 2 in. / DN 40 and 50 Body Sizes
416 Stainless steel 1P788335132
316 Stainless steel, NACE, Oxygen Service 1P788335072
11 Control Spring, NACE(1) See Table 2
12* Diaphragm See following tables
Key Description Part Number
Parts Ordering
When corresponding with your local Sales O󰀩ce about
this equipment, always reference the equipment serial
number stamped on the nameplate.
When ordering replacement parts, specify the
complete 11-character part number of each required
part as found in the following parts list. Separate kits
containing all recommended spare parts are available.
Note
In this parts list, parts marked NACE are
intended for corrosion-resistant service
as detailed in the NACE International
Standard MR0175, NACE MR0103 and/or
NACE MR0175/ISO 15156.

13
MR98 Series AD2000 Compliant
D-A-CH Region Only
*Recommended Spare Part
Monel® is a mark owned by Special Metals Corporation.
Hastelloy® C is a mark owned by Haynes International, Inc.
1. Part meets NACE requirements only for applications in which the part is not exposed to sour gas.
13 Nameplate - - - - - - - - - - -
14 Diaphragm Protector, PTFE, NACE
Types MR98H and MR98HH
1/2 in. / DN 15 Body Size 11A5136X012
3/4 and 1 in. / DN 20 and 25 Body Sizes 11A5137X012
1-1/2 and 2 in. / DN 40 and 50 Body Sizes 11A5527X012
15 Adjusting Screw, NACE(1)
Sealed Stainless steel Square Head Adjustment
1/2 in. / DN 15 Body Size
Type MR98H GF05553X022
Type MR98HH ERAA02340A1
3/4 and 1 in. / DN 20 and 25 Body Sizes
Types MR98H GF05543X022
Type MR98HH ERCA01483A1
1-1/2 and 2 in. / DN 40 and 50 Body Sizes GF05522X012
16 Cap Screws, NACE(1)
Types MR98H and MR98HH
1/2 in. / DN 15 Body Size
Stainless steel (8 required) ERAA50460A0
3/4 and 1 in. / DN 20 and 25 Body Sizes
Stainless steel (8 required) ERAA50461A0
1-1/2 and 2 in. / DN 40 and 50 Body Sizes
Stainless steel (8 required) ERAA50462A0
17 Jam Nut, NACE(1)
Sealed Stainless steel Square Head Adjustment
1/2 in. / DN 15 Body Size ERCA00380A1
3/4 and 1 in. / DN 20 and 25 Body Sizes GF05453X022
1-1/2 and 2 in. / DN 40 and 50 Body Sizes ERCA00633A1
18 Drive Screw (4 required), NACE ERAA01884A0
19* Diaphragm Gasket
302 Stainless steel diaphragm
Types MR98H and MR98HH
1/2 in. / DN 15 Body Size ERCA00380A1
3/4 and 1 in. / DN 20 and 25 Body Sizes GF05453X022
1-1/2 and 2 in. / DN 40 and 50 Body Sizes ERCA00633A1
302 Stainless steel - Oxygen Service diaphragm
Types MR98H and MR98HH
1/2 in. / DN 15 Body Size ERCA00485A2
3/4 and 1 in. / DN 20 and 25 Body Sizes ERCA00510A2
1-1/2 and 2 in. / DN 40 and 50 Body Sizes ERCA00526A2
302 Stainless steel - Steam Service, Monel®
and Hastelloy® C Diaphragms
Types MR98H and MR98HH
1/2 in. / DN 15 Body Size ERCA00485A1
3/4 and 1 in. / DN 20 and 25 Body Sizes ERCA00510A1
1-1/2 and 2 in. / DN 40 and 50 Body Sizes ERCA00526A1
21 Diaphragm Head
1/2 in. / DN 15 Body Size
Steel, NACE(1) 1L339625072
Stainless steel, NACE 1L3396X0012
3/4 and 1 in. / DN 20 and 25 Body Sizes
Steel, NACE(1) 1L342125072
Stainless steel, NACE 1L3421X0012
1-1/2 and 2 in. / DN 40 and 50 Body Sizes
(2 required)
416 Stainless steel ERCA00578A0
316 Stainless steel, NACE, Oxygen Service ERCA00578A1
24 Machine Screw
1/2 in. / DN 15 Body Size
416 Stainless steel 1J4159X0012
316 Stainless steel, NACE, Oxygen Service 1J4159X0012
Hastelloy® C, NACE 1J4159X0062
3/4 and 1 in. / DN 20 and 25 Body Sizes
416 Stainless steel 1L343538992
316 Stainless steel, NACE, Oxygen service 1L3435X0012
Hastelloy® C, NACE 1L3435X0052
24 Machine Screw (continued)
1-1/2 and 2 in. / DN 40 and 50 Body Sizes
416 Stainless steel 1P788638992
316 Stainless steel, NACE, Oxygen Service 1P788638992
Hastelloy® C, NACE 1P7886X0022
25 O-ring Retainer
1/2 in. / DN 15 Body Size
416 Stainless steel GF05078X022
316 Stainless steel, NACE, Oxygen Service GF05078X032
Hastelloy® C, NACE GF05078X052
3/4 and 1 in. / DN 20 and 25 Body Sizes
416 Stainless steel 1L343035132
316 Stainless steel, NACE, Oxygen Service 1L343035072
Hastelloy® C, NACE 1L3430X0022
25 Seat Retainer
1-1/2 and 2 in. / DN 40 and 50 Body Sizes
416 Stainless steel ERCA00377A0
316 Stainless steel, NACE, Oxygen Service ERCA00377A1
Hastelloy® C, NACE ERCA00377A3
28 Lockwasher, NACE(1)
1/2 in. / DN 15 Body Size
Stainless steel ERAA01919A1
3/4 and 1 in. / DN 20 and 25 Body Sizes
Stainless steel 1H6243X0012
1-1/2 and 2 in. / DN 40 and 50 Body Sizes
Stainless steel ERCA00379A1
29* Gasket, NACE
Composition Diaphragm
1/2 in. / DN 15 Body Size ERAA02651A0
3/4 and 1 in. / DN 20 and 25 Body Sizes ERCA00502A0
Metal Diaphragm
1/2 in. / DN 15 Body Size
302 Stainless steel ERAA02651A0
302 Stainless steel - Oxygen Service ERAA02651A2
302 Stainless steel - Steam Service, Monel®
and Hastelloy® C ERAA02651A1
3/4 and 1 in. / DN 20 and 25 Body Sizes
302 Stainless steel ERCA00502A0
302 Stainless steel - Oxygen Service ERCA00502A2
302 Stainless steel - Steam Service, Monel®
and Hastelloy® C ERCA00502A1
1-1/2 and 2 in. / DN 40 and 50 Body Sizes
(2 required)
302 Stainless steel ERCA00579A0
302 Stainless steel - Oxygen Service ERCA00579A2
302 Stainless steel - Steam Service, Monel®
and Hastelloy® C ERCA00579A1
31 Locknut, NACE(1)
1/2 in. / DN 15 Body Sizes ERCA00663A0
3/4 and 1 in. / DN 20 and 25 Body Sizes 1L872224122
1-1/2 and 2 in. / DN 40 and 50 Body Sizes 1P788724122
45* O-ring
1/2 in. / DN 15 Body Size
Nitrile (NBR) ERAA01672A0
Fluorocarbon (FKM) ERAA01672A1
Ethylenepropylene (EPDM) ERAA01672A2
3/4 and 1 in. / DN 20 and 25 Body Sizes
Nitrile (NBR) ERAA02070A0
1-1/2 and 2 in. / DN 40 and 50 Body Sizes
Nitrile (NBR) ERCA00664A0
Fluorocarbon (FKM) ERCA00664A1
Ethylenepropylene (EPDM) ERCA00664A2
47 NACE Tag - - - - - - - - - - -
48 Tag Wire - - - - - - - - - - -
50* Sealing Washer
1/2 in. / DN 15 Body Size 1V205699012
3/4 and 1 in. / DN 20 and 25 Body Sizes 11A9681X012
1-1/2 and 2 in. / DN 40 and 50 Body Sizes 1V424699012
Key Description Part Number Key Description Part Number

14
MR98 Series AD2000 Compliant
D-A-CH Region Only
51 Vent
Type MR98HH
1/2 to 1 in. / DN 15 to 25 Body Sizes ERAA02123A0
Type MR98H
1-1/2 and 2 in. / DN 40 and 50 Body Sizes ERAA02123A0
52 Plug, 1/2 to 2 in. / DN 15 to 50 Body Sizes ERAA01942A0
53* Valve Plug O-ring
1/2 in. / DN 15 Body Size
Ethylenepropylene (EPDM) ERCA02968A2
Fluorocarbon (FKM) ERCA02968A1
Perfluoroelastomer (FFKM) ERCA02968A3
Nitrile (NBR) ERCA02968A0
3/4 and 1 in. / DN 20 and 25 Body Sizes
Ethylenepropylene (EPDM) ERCA00973A2
Fluorocarbon (FKM) ERCA00973A1
Perfluoroelastomer (FFKM) ERCA00973A3
Nitrile (NBR) ERCA00973A0
1-1/2 and 2 in. / DN 40 and 50 Body Sizes
Ethylenepropylene (EPDM) ERCA01406A2
Fluorocarbon (FKM) ERCA01406A1
Perfluoroelastomer (FFKM) ERCA01406A3
Nitrile (NBR) ERCA01406A0
58 Washer
1/2 in. / DN 15 Body Size
416 Stainless steel GF05050X012
316 Stainless steel, NACE, Oxygen Service GF05050X022
Hastelloy® C, NACE GF05050X042
Monel®, NACE GF05050X032
3/4 and 1 in. / DN 20 and 25 Body Sizes
416 Stainless steel GF05525X012
316 Stainless steel, NACE, Oxygen Service GF05525X022
Hastelloy® C, NACE GF05525X042
Monel®, NACE GF05525X032
59* O-ring
1/2 in. / DN 15 Body Size
Nitrile (NBR) seat ERCA02974A0
Fluorocarbon (FKM) seat ERCA02974A1
Ethylenepropylene (EPDM) seat ERCA02974A2
Perfluoroelastomer (FFKM) seat ERCA02974A3
3/4 and 1 in. / DN 20 and 25 Body Sizes
Nitrile (NBR) seat ERCA00974A0
Fluorocarbon (FKM) seat ERCA00974A1
Ethylenepropylene (EPDM) seat ERCA00974A2
Perfluoroelastomer (FFKM) seat ERCA00974A3
Key Description Part Number Key Description Part Number
59* L-ring
1-1/2 and 2 in. / DN 40 and 50 Body Sizes
Nitrile (NBR) seat ERCA00668A1
Fluorocarbon (FKM) seat ERCA00668A2
Ethylenepropylene (EPDM) seat ERCA00668A3
Perfluoroelastomer (FFKM) seat ERCA00668A5
63* Bottom Plug Seal
1/2 in. / DN 15 Body Size
Nitrile (NBR) ERCA03016A0
Fluorocarbon (FKM) ERCA03016A1
Ethylenepropylene (EPDM) ERCA03016A2
Graphite ERCA02978A0
3/4 and 1 in. / DN 20 and 25 Body Sizes
Nitrile (NBR) ERCA00628A0
Perfluoroelastomer (FFKM) ERCA00628A3
Fluorocarbon (FKM) ERCA00628A1
Ethylenepropylene (EPDM) ERCA00628A2
Graphite ERCA00517A0
1-1/2 and 2 in. / DN 40 and 50 Body Sizes
Nitrile (NBR) ERCA00630A0
Fluorocarbon (FKM) ERCA00630A1
Ethylenepropylene (EPDM) ERCA00630A2
Graphite ERCA01407A0
64 Flow Arrow - - - - - - - - - - -
65 Pipe Plug
3/4 to 2 in. / DN 20 to 50 Body Sizes
Stainless steel ERAA03131A0
66 Pressure Gauge
3/4 to 2 in. / DN 20 to 50 Body Sizes
0 to 15 psig / 0 to 1.0 bar, Stainless steel ERAA03132A0
0 to 30 psig / 0 to 2.1 bar, Stainless steel ERAA03132A1
0 to 60 psig / 0 to 4.1 bar, Stainless steel ERAA03132A2
0 to 160 psig / 0 to 11.0 bar, Stainless steel ERAA03132A3
0 to 300 psig / 0 to 20.7 bar, Stainless steel ERAA03132A4
0 to 1000 psig / 0 to 68.9 bar, Stainless steel ERAA03132A5
68 Restriction, NACE
Types MR98HH
3/4 and 1 in. / DN 20 and 25 Body Sizes ERAA03257A0
69 ATEX Tag - - - - - - - - - - -
70 PED Tag - - - - - - - - - - -
*Recommended Spare Part
Monel® is a mark owned by Special Metals Corporation.
Hastelloy® C is a mark owned by Haynes International, Inc.
1. Part meets NACE requirements only for applications in which the part is not exposed to sour gas.

15
MR98 Series AD2000 Compliant
D-A-CH Region Only
Key 1, Types MR98H and MR98HH Body Part Numbers
BODY SIZE BODY CONSTRUCTION END CONNECTION STYLE
BODY MATERIAL
1.4408 Stainless steel(1)
1/2 in. / DN 15
Without control line
G Thread ERAA51929A0
Integral PN 16/25/40 RF ERAA51928A0
With control line G Thread ERAA51931A0
3/4 in. / DN 20
Without gauge port and control line G Thread ERAA51930A0
With control line but without gauge port G Thread ERAA51932A0
With gauge port but without control line G Thread ERAA51933A0
1 in. / DN 25
Without gauge port and control line
G Thread ERAA51935A0
Integral PN 16/25/40 RF ERAA51934A0
With control line but without gauge port G Thread ERAA51936A0
With gauge port but without control line G Thread ERAA51937A0
1-1/2 in. / DN 40
Without gauge port and control line G Thread ERAA51938A0
With control line but without gauge port G Thread ERAA51939A0
With gauge port but without control line G Thread ERAA51940A0
2 in. / DN 50
Without gauge port and control line
G Thread ERAA51942A0
Integral PN 16/25/40 RF ERAA51941A0
With control line but without gauge port G Thread ERAA51943A0
With gauge port but without control line G Thread ERAA51944A0
1. Meets the chemical and physical requirements of NACE MR0175-2002, NACE MR0103 and NACE MR0175/ISO 15156.
Note: Contact your local Sales O󰀩ce if additional gauge and control line options are needed.
Monel® is a mark owned by Special Metals Corporation.
Hastelloy® C is a mark owned by Haynes International, Inc.
Key 2, Spring Case Part Numbers
TYPE
BODY SIZE
STYLE
SPRING CASE MATERIAL
In. DN 1.4408 Stainless steel(1)
MR98H
1/2 15 1/4 NPT Vent ERAA50448A0
3/4 and 1 20 and 25 1/4 NPT Vent ERAA50449A0
1-1/2 and 2 40 and 50 1/4 NPT Vent ERAA50450A0
MR98HH
1/2 15 1/4 NPT Vent ERAA51945A0
3/4 and 1 20 and 25 1/4 NPT Vent ERAA51946A0
1. Meets the chemical and physical requirements of NACE MR0175-2002, NACE MR0103 and NACE MR0175/ISO 15156.
Key 4*, Valve Plug, Metal Seat
BODY SIZE
BODY STYLE
VALVE PLUG MATERIAL
In. DN 416 Stainless Steel 316 Stainless Steel(1) Alloy 6(1) Hastelloy® C(1) Monel® (1)
1/2 15
Without control line ERCA01337A0 ERCA01337A1 ERCA01337A4 ERCA01337A3 ERCA01337A2
With control line ERCA01305A0 ERCA01305A1 - - - - - - - - - - - ERCA01305A3 ERCA01305A2
3/4 and 1 20 and 25
Without control line GF04828X022 GF04828X032 GF04828X062 GF04828X052 GF04828X042
With control line GF05479X022 GF05479X032 - - - - - - - - - - - GF05479X052 GF05479X042
1-1/2 and 2 40 and 50
Without control line GF04899X022 GF04899X032 GF04899X062 GF04899X052 GF04899X042
With control line and
with composition diaphragm GF05514X022 GF05514X032 - - - - - - - - - - - GF05514X052 GF05514X042
With control line and
with metal diaphragm GF05514X022 GF05514X032 - - - - - - - - - - - GF05518X052 GF05518X042
*Recommended Spare Part
1. NACE MR0175-2002, NACE MR0103 and NACE MR0175/ISO 15156.

16
MR98 Series AD2000 Compliant
D-A-CH Region Only
Monel® is a mark owned by Special Metals Corporation.
Hastelloy® C is a mark owned by Haynes International, Inc.
Key 4*, Valve Plug, Composition Seat
BODY SIZE
BODY STYLE
VALVE PLUG MATERIAL
In. DN 416 Stainless Steel 316 Stainless Steel(1)(2) Hastelloy® C(1)
1/2 15
Without control line ERCA01338A0 ERCA01338A1 - - - - - - - - - - -
With control line ERCA01333A0 ERCA01333A1 ERCA01333A3
3/4 and 1 20 and 25
Without control line GF04829X022 GF04829X032 - - - - - - - - - - -
With control line GF05547X022 GF05547X032 GF05547X052
1-1/2 and 2 40 and 50
Without control line GF05520X022 GF05520X032 - - - - - - - - - - -
With control line GF05518X022 GF05518X032 GF05518X052
*Recommended Spare Part
1. NACE MR0175-2002, NACE MR0103 and NACE MR0175/ISO 15156.
2. Oxygen Service
Key 12*, Composition Diaphragm, NACE
TYPE
BODY SIZE DIAPHRAGM MATERIAL
In. DN Neoprene (CR) Fluorocarbon (FKM)
(2 required) EPDM
MR98H and MR98HH
1/2 15 ERCA00512A0 ERCA00512A1 ERCA00512A2
3/4 and 1 20 and 25 ERCA00518A0 ERCA00518A1 ERCA00518A2
1-1/2 and 2 40 and 50 ERCA00661A0 ERCA00661A1 ERCA00661A2
*Recommended Spare Part
Key 12*, Metal Diaphragm
TYPE
BODY SIZE BODY MATERIAL (2 REQUIRED)
In. DN 302 Stainless Steel 302 Stainless Steel
(Oxygen Service) Monel®Hastelloy® C
MR98H
1/2 15 ERCA00496A0 ERCA00496A1 ERCA00496A2 ERCA00496A3
3/4 and 1 20 and 25 GF05737X022 GF05737X032 GF05737X042 GF05737X052
1-1/2 and 2 40 and 50 ERCA00527A0 ERCA00527A1 ERCA00527A2 ERCA00527A3
MR98HH
1/2 15 ERCA00496A0 ERCA00496A1 ERCA00496A2 ERCA00496A3
3/4 and 1 20 and 25 GF05737X022 GF05737X032 GF05737X042 GF05737X052
*Recommended Spare Part

50
19
12
59
25
24T
52
4
53 L1
64
13
69
71
18
18
17
11
31
8
1
29
9 L2
7 L2
3 L2
5 L2
2
28
12
58
4
15L2
63
L1
L4
10L2
16
L2(2)
GF04916
17
MR98 Series AD2000 Compliant
D-A-CH Region Only
SEALED ADJUSTING
SCREW OPTION
CONTROL LINE OPTION
COMPOSITE SEAT OPTION
METAL DIAPHRAGM OPTION
APPLY(1):
T = THREAD LOCKER
L1 = GENERAL PURPOSE PTFE OR LITHIUM GREASE FOR O-RINGS
L2 = ANTI - SEIZE COMPOUND
L4 = GRAPHITE SEALANT FOR GRAPHITE RING
1. Lubricants and sealants must be selected such that they meet the temperature requirements.
2. Apply L2 (anti-seize compound) on key 16 for Stainless steel bolts.
3. Apply L4 (graphite sealant) instead of L1 (general purpose PTFE or lithium grease) on key 63 for graphite ring.
Note: Use key 69 or 71 only when specied.
Figure 3. Type MR98H Assembly with 1/2 to 1 in. / DN 15 to 25 Body Sizes
OR(3)
NAMEPLATE AND FLOW ARROW

50
52
4
53 L1
24
59
25
T
29
19
12
64
13
69
71
18
18
5L2
3L2
51
15L2
2
11
31
45L1
28
21
10
17
9 L2
L2
12
16
8
L2(2)
4
1
63
L1
L4
ERAA03248
18
MR98 Series AD2000 Compliant
D-A-CH Region Only
OR(3)
SEALED ADJUSTING
SCREW OPTION
CONTROL LINE OPTION
COMPOSITE SEAT OPTION
METAL DIAPHRAGM OPTION
APPLY(1):
T = THREAD LOCKER
L1 = GENERAL PURPOSE PTFE OR LITHIUM GREASE FOR O-RINGS
L2 = ANTI - SEIZE COMPOUND
L4 = GRAPHITE SEALANT FOR GRAPHITE RING
1. Lubricants and sealants must be selected such that they meet the temperature requirements.
2. Apply L2 (anti-seize compound) on key 16 for Stainless steel bolts.
3. Apply L4 (graphite sealant) instead of L1 (general purpose PTFE or lithium grease) on key 63 for graphite ring.
Note: Use key 69 or 71 only when specied.
Figure 4. Type MR98H Assembly with 1-1/2 to 2 in. / DN 40 to 50 Body Sizes
NAMEPLATE AND FLOW ARROW

24
59
25 52
4
12 19
T53 L1
28
51
17
11
9 L2
31
8
1
29
7
3 L2
5 L2
2
10
15L2
L2
16
12
58
68
L2(2)
4
63
L1
L4
13
69
71
18
18 64
ERCA00605
19
MR98 Series AD2000 Compliant
D-A-CH Region Only
COMPOSITE SEAT OPTION CONTROL LINE OPTION
METAL DIAPHRAGM OPTION
OR(3)
SEE NOTE 4
APPLY(1):
T = THREAD LOCKER
L1 = GENERAL PURPOSE PTFE OR LITHIUM GREASE FOR O-RINGS
L2 = ANTI - SEIZE COMPOUND
L4 = GRAPHITE SEALANT FOR GRAPHITE RING
1. Lubricants and sealants must be selected such that they meet the temperature requirements.
2. Apply L2 (anti-seize compound) on key 16 only for Stainless steel bolts.
3. Apply L4 (graphite sealant) instead of L1 (general purpose PTFE or lithium grease) on key 63 for graphite ring.
4. Key 68 is available for Type MR98HH with 3/4 and 1 in. / DN 20 and 25 bodies only.
Note: Use key 69 or 71 only when specied.
Figure 5. Type MR98HH Assembly with 1/2 to 1 in. / DN 15 to 25 Body Sizes
NAMEPLATE AND FLOW ARROW

MR98 Series AD2000 Compliant
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