D103588X014
Installation Guide
English – April 2014
MR98 Series
www.fisherregulators.com
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.fisherregulators.com. For further information refer to
MR98 Series Backpressure Regulators, Relief and Differential
Relief valves Instruction Manual, D103588X012.
P.E.D. Category
This product may be used as a safety accessory with pressure
equipment in the following Pressure Equipment Directive 97/23/EC
categories. It may also be used outside of the Pressure Equipment
Directive using Sound Engineering Practice (SEP) per table below.
Monel
®
is a mark owned by Special Metals Corporation.
Hastelloy
®
C is a mark owned by Haynes International, Inc.
1. The pressure/temperature limits in this Installation Guide and any applicable standard or code limitation should not be exceeded.
2. The pressure limits given are based on the body size and body materials only. Actual pressure limits of the assembled regulator may decrease and vary depending on the
temperature, body end connection, diaphragm, seat and/or trim material of the regulator.
3. Fluorocarbon (FKM) is limited to 93°C / 200°F hot water.
Maximum Spring Case Loading Pressure for
Types MR98LD, MR98HD and MR98HHD (Spring Setting
Plus Loading Pressure)
(1)(2)
Type MR98LD Spring Case
Gray Cast Iron:
3.4 bar / 50 psig
Steel or Stainless Steel:
8.6 bar / 125 psig
Type MR98HD Spring Case
Gray Cast Iron:
17.2 bar / 250 psig
Steel or Stainless Steel:
20.7 bar / 300 psig
Type MR98HHD Spring Case
Steel or Stainless Steel:
20.7 bar / 300 psig
Temperature Capabilities
(1)
Elastomer Parts:
Nitrile (NBR) and Neoprene (CR):
-40 to 82°C / -40 to 180°F
Fluorocarbon (FKM)
(3)
:
-18 to 149°C / 0 to 300°F
Ethylenepropylene (EPDM):
-7 to 135°C / 20 to 275°F
Perfluoroelastomer (FFKM):
-18 to 218°C / 0 to 425°F
Polytetrafluoroethylene (PTFE) Diaphragm protector:
-40 to 204°C / -40 to 400°F
Body Materials:
Gray Cast Iron:
-29 to 208°C / -20 to 406°F
WCC Steel:
-29 to 232°C / -20 to 450°F
LCC Steel:
-40 to 232°C / -40 to 450°F
Stainless Steel, Monel
®
and Hastelloy
®
C:
-40 to 232°C / -40 to 450°F
Pressure Registration
Internal or External
Shutoff Classification Per ANSI/FCI 70-3-2004
Metal Seats:
Class IV
PTFE:
Class IV
Elastomer Seats:
Class VI or better
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
TYPE
PRODUCT SIZE
BODY MATErIAL
CATEgOrY
All
1/4 NPT, DN 15 to 25 /
1/2 to 1-inch
All available
materials
SEP
MR98H/
MR98HD
DN 40 and 50 /
1-1/2 and 2-inch
Steel and
Stainless Steel
II
Specifications
Available Constructions
Type MR98L:
Direct-operated low pressure backpressure
regulator/relief valve with 0.14 to 2.6 bar / 2 to 38 psig set
pressure range
Type MR98H:
Direct-operated high pressure backpressure
regulator/relief valve with 0.34 to 13.8 bar / 5 to 200 psig set
pressure range
Type MR98HH:
Direct-operated high pressure backpressure/
relief valve with 10.3 to 25.9 bar / 150 to 375 psig set
pressure range
Type MR98LD:
Pressure-loaded low pressure differential
pressure relief valve with 0.14 to 2.6 bar / 2 to 38 psi set
pressure range
Type MR98HD:
Pressure-loaded high pressure differential
pressure relief valve with 0.34 to 13.8 bar / 5 to 200 psi set
pressure range
Type MR98HHD:
Pressure-operated high pressure
backpressure/relief valve with 10.3 to 25.9 bar /
150 to 375 psi differential set pressure range
Body and Orifice Sizes
1/4 NPT body:
7.22 mm / 0.284-inch orifice
DN 15 / 1/2-inch body:
10.56 mm / 0.416-inch orifice
DN 20 and 25 / 3/4 and 1-inch bodies:
16.02 mm / 0.631-inch orifice
DN 40 and 50 / 1-1/2 and 2-inch bodies:
29 mm / 1.142-inch orifice
End Connection Styles
NPT, SWE and Welded and Integral CL150 RF, CL300 RF
and PN 16/25/40 RF; all sizes are fabricated with slip-on
flanges (for welded end connections) and are EN flanged
356-mm face-to-face (14-inch face-to-face)
Maximum Inlet and Outlet Pressure Rating
See Table 2
Maximum Cold Working Pressures of Body Size and Materials
(1)(2)
See Table 2
Set Pressure Ranges
(1)
See Table 1
