Emerson MR98 Series User manual

Installation Guide
D104615X014
April 2022
MR98 Series AD2000 Compliant
D-A-CH Region Only
Introduction
This Installation Guide provides instructions for
installation, startup and adjustment. To receive a
copy of the Instruction Manual, contact your local
Sales Office or view a copy at www.emerson.
com. For further information, refer to MR98 Series
Backpressure Regulators and Relief valves Instruction
Manual, D104615X012 (D.A.CH. Region Only).
PED Category
This product may be used as a safety accessory
with pressure equipment in the following Pressure
Equipment Directive. It may also be used outside
of the Pressure Equipment Directive using Sound
Engineering Practice (SEP) per table below. For
information on the current PED revision, see Bulletin:
D103053X012 (D.A.CH. Region Only).
Specifications
Available Constructions
Type MR98H: Backpressure regulator/relief valve
for spring settings range from 0.34 to 13.8 bar /
5 to 200 psig.
Type MR98HH: Backpressure regulator/relief
valve for spring settings range from 10.3 to
25.9 bar / 150 to 375 psig.
Body and Orifice Sizes
DN 15 / 1/2 in. body: 10.56 mm / 0.416 in. orifice
DN 20 and 25 / 3/4 and 1 in. bodies:
16.02 mm / 0.631 in. orifice
DN 40 and 50 / 1-1/2 and 2 in. bodies:
29 mm / 1.142 in. orifice
End Connection Styles
G Thread and Integral PN 16/25/40 RF; all
flanged sizes are fabricated with a 356 mm / 14 in.
face-to-face dimension.
Set Pressure Ranges(1)
See Table 1
Maximum Cold Working Pressures of Body Size
and Materials(1)(6)
See Table 2
Maximum Inlet, Outlet and Spring Case
Pressure Ratings(1)
See Table 2
Temperature Capabilities of Body Materials(1)(2)
Temperature Capabilities of Trim Materials(1)(2)
Flow Coefficients
IEC Sizing Coefficients
Pressure Registration
Internal or External
Shutoff Classification Per ANSI/FCI 70-3-2004
Metal Seats: Class IV
PTFE: Class IV
Elastomer Seats: Class IV or better
TYPE PRODUCT SIZE BODY
MATERIAL CATEGORY
MR98H/
MR98HH
DN 15 to 25 /
1/2 to 1 in. Stainless steel SEP
MR98H DN 40 and 50 /
1-1/2 and 2 in. Stainless steel II
BODY MATERIAL TEMPERATURE RANGE
Stainless steel(4) -40 to 232°C / -40 to 450°F
TRIM MATERIAL
PART TEMPERATURE RANGE
Seat
Diaphragm
O-ring
Diaphragm
Protector
°C °F
Nitrile (NBR)   -40 to 82 -40 to 180
Neoprene (CR) -40 to 82 -40 to 180
Fluorocarbon (FKM)(3)  -18 to 149(5) 0 to 300(5)
Ethylenepropylene
(EPDM)  -7 to 135 20 to 275
Peruoroelastomer
(FFKM)   -18 to 218 0 to 425
Polytetrauoroethylene
(PTFE) -40 to 204 -40 to 400
Metal   -40 to 450 -40 to 232
BODY SIZE CVCgC1
DN In.
15 1/2 3.4 120 35.3
20 and 25 3/4 and 1 6.5 250 38.5
40 and 50 1-1/2 and 2 20.0 780 39.0
BODY SIZE XTFdFLKm
DN In.
15 1/2 0.787 0.78 0.94 0.88
20 and 25 3/4 and 1 0.935 0.70 0.91 0.83
40 and 50 1-1/2 and 2 0.961 0.69 0.94 0.88
1. The pressure/temperature limits in this Installation Guide and any applicable standard or code 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).
5. Limited to 93°C / 200°F for hot water.
6. Temperature, trim material and/or the body end connection may decrease these maximum pressures.

2
MR98 Series AD2000 Compliant
D-A-CH Region Only
Table 1. MR98 Series Body Sizes and Pressure Ranges
TYPE BODY SIZE CONTROL PRESSURE RANGE(1)
DN In. bar psig
MR98H
15, 20 and 25 1/2, 3/4 and 1
1.0 to 2.4 15 to 35
1.7 to 5.2 25 to 75
4.8 to 9.7 70 to 140
9.0 to 13.8 130 to 200
40 and 50 1-1/2 and 2
0.34 to 2.4 5 to 35
1.4 to 4.5 20 to 65
3.4 to 6.9 50 to 100
5.2 to 11.7 75 to 170
MR98HH 15 1/2 10.3 to 25.9 150 to 375
20 and 25 3/4 and 1 10.3 to 23.1 150 to 335
1. All springs may be backed o󰀨 to 0 bar / 0 psig. However, highest capacities and best performances are obtained by using these springs in their recommended ranges.
Table 2. Maximum Cold Working Pressures of Body Size and Materials(1)(2)
REGULATOR
TYPE
BODY SIZE BODY AND SPRING
CASE MATERIAL
MAXIMUM INLET
PRESSURE(3)
MAXIMUM
OUTLET PRESSURE
MAXIMUM SPRING
CASE PRESSURE
DN In. bar psig bar psig bar psig
MR98H 15, 20, 25,
40, 50
1/2, 3/4, 1,
1-1/2, 2 Stainless Steel(4) 20.7 300 20.7 300 20.7 300
MR98HH 15 1/2 Stainless Steel(4) 27.6 400 27.6 400 27.6 400
20, 25 3/4, 1 23.4 340 23.4 340 23.4 340
1. The pressure/temperature limits in this Installation Guide and any applicable standard or code 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.
4. Meets API 614 Requirements (with stainless steel trim).

3
MR98 Series AD2000 Compliant
D-A-CH Region Only
Installation
▲ WARNING
Only qualified personnel shall install or
service a relief valve or backpressure
regulator. Relief valve or backpressure
regulator should be installed, operated
and maintained in accordance with
international and applicable codes
and regulations and Emerson Process
Management Regulator Technologies,
Inc. instructions.
If using a relief valve or backpressure
regulator on a hazardous or flammable
fluid service, personal injury and
property damage could occur due to
fire or explosion of vented fluid that
may have accumulated. To prevent
such injury or damage, provide
piping or tubing to vent the fluid
to a safe, well- ventilated area or
containment vessel.
Also, when venting a hazardous fluid,
the piping or tubing should be located
far enough away from any buildings
or windows so to not create a further
hazard and the vent opening should be
protected against anything that could
clog it.
Personal injury, equipment damage
or leakage due to escaping fluid
or bursting of pressure-containing
parts may result if this relief valve or
backpressure regulator is overpressured
or is installed where service conditions
could exceed the limits given in
the Specifications 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
relief valve or backpressure regulator
could result in personal injury and
property damage due to escaping fluid.
To avoid such injury and damage,
install the relief valve or backpressure
regulator in a safe location.
Clean out all pipelines before installation of the relief
valve or backpressure regulator and check to be
sure the relief valve or backpressure has not been
damaged or has collected foreign material during
shipping. For G bodies, apply pipe compound to
the external pipe threads. For flanged bodies, use
suitable line gaskets and approved piping and bolting
practices. Install the relief valve or backpressure
regulator in any position desired, unless otherwise
specified, but be sure flow through the body is in the
direction indicated by the arrow on the body.
Note
It is important that the relief valve or
backpressure regulator be installed
so that the vent hole in the spring
case is unobstructed at all times. For
outdoor installations, the relief valve
or backpressure regulator should be
located away from vehicular traffic and
positioned so that water, ice and other
foreign materials cannot enter the spring
case through the vent. Avoid placing the
relief valve or backpressure regulator
beneath eaves or downspouts and be
sure it is above the probable snow level.
Overpressure Protection
Maximum inlet pressure depends upon body material
and temperatures. See Specifications section or the
maximum inlet pressure of the valve. The valve should
be inspected for damage after any overpressure
condition. Fisher™ relief valve or backpressure
regulators are NOT ASME safety relief valves.

4
MR98 Series AD2000 Compliant
D-A-CH Region Only
Startup
The relief valve or backpressure regulator is factory
set at approximately the midpoint of the spring range
or the pressure requested, so an initial adjustment
may be required to give the desired results. With
proper installation completed and relief valves properly
adjusted, slowly open the upstream and downstream
shutoff valves (if applicable).
Adjustment
To change the control pressure, remove closing
cap or loosen the jam nut and turn the adjusting
screw clockwise to increase control pressure or
counterclockwise to decrease pressure. Monitor
the control pressure with a test gauge during the
adjustment. Replace closing cap or tighten the jam nut
to maintain the desired setting.
Taking Out of Service (Shutdown)
▲ WARNING
To avoid personal injury resulting from
sudden release of pressure, isolate
the regulator from all pressure before
attempting disassembly.
Parts List
Key Description
1 Body
2 Spring Case
3* Orice
4* Valve Plug
5 Bottom Plug
7 Valve Plug Guide
8 Lower Spring Seat
9 Upper Spring Seat
10 Pusher Post
11 Control Spring
12* Diaphragm (2 required for metal, Fluorocarbon (FKM) and
Ethylenepropylene (EPDM) diaphragms)
13 Nameplate
14 Diaphragm Protector (not shown)
15 Adjusting Screw
16 Cap Screws
Types MR98H, MR98HH:
DN 15 to 50 / 1/2 to 2 in. bodies - 8 required
17 Jam Nut
18 Drive Screw (4 required)
19* Diaphragm Gasket (2 required for pressure loaded spring case)
24 Machine Screw
25 O-ring Retainer
25 Seat Retainer
28 Lockwasher
29* Gasket
31 Locknut
45* O-ring
47 NACE Tag (not shown)
48 Tag Wire (not shown)
52 Plug
53* Valve Plug O-ring
57 Jam Nut (not shown)
58 Washer
59* O-ring
59* L-ring
62 Adaptor (not shown)
63* Bottom Plug Seal
64 Flow Arrow
65 Pipe Plug (not shown)
66 Pressure Gauge (not shown)
68 Restriction (not shown)
69 ATEX Tag (not shown)
70 PED Tag (not shown)
*Recommended spare part

5
MR98 Series AD2000 Compliant
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
D-A-CH Region Only
Figure 1. Type MR95H Assembly
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.
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
NAMEPLATE AND FLOW ARROW
METAL DIAPHRAGM OPTION
COMPOSITE SEAT OPTION
CONTROL LINE OPTION
SEALED ADJUSTING
SCREW OPTION
OR(3)

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Emerson Automation Solutions
MR98 Series AD2000 Compliant
For further information on the current
PED revision see Bulletin: D103053X012
or scan the QR code.
The distinctive diamond shape cast into every spring
case uniquely identifies the regulator as part of the
Fisher™ brand and assures you of the highest-quality
engineering, durability, performance, and support.
Fisher.com
Americas
McKinney, Texas 75070 USA
T [phone]
[phone]
Europe
Bologna 40013, Italy
T [phone]
Katzbergstr. 1
D-40764 Langenfeld
Deutschland
T [phone]
Asia Pacic
Singapore 128461, Singapore
T [phone]
Middle East and Africa
Dubai, United Arab Emirates
T [phone]
D-A-CH Region Only
D104615X014 © 2022 Emerson Process Management Regulator
Technologies, Inc. All rights reserved. 04/22.
The Emerson logo is a trademark and service mark of Emerson
Electric Co. All other marks are the property of their prospective owners.
Fisher™ is a mark owned by Fisher Controls International LLC, a
business of Emerson Automation Solutions.
The contents of this publication are presented for informational purposes
only, and while every e󰀨ort has been made to ensure their accuracy,
they are not to be construed as warranties or guarantees, express or
implied, regarding the products or services described herein or their
use or applicability. All sales are governed by our terms and conditions,
which are available upon request. We reserve the right to modify or
improve the designs or specications of such products at any time
without notice.
Emerson Process Management Regulator Technologies, Inc does not
assume responsibility for the selection, use or maintenance of any
product. Responsibility for proper selection, use and maintenance of any
Emerson Process Management Regulator Technologies, Inc. product
remains solely with the purchaser.