Emerson MR98LD Installation Guide

Installation Guide
D103588X014
MR98 Series
English – October 2022
Introduction
This Installation Guide provides instructions for
installation, startup and adjustment. To receive a
copy of the instruction manual, contact your local
Sales O󰀩ce or view a copy at www.fisher.com. For
further information refer to MR98 Series Backpressure
Regulators, Relief and Di󰀨erential 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. 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. For information on the current PED
revision see Bulletin: D103053X012.
Specications
Available Constructions
Type MR98L: Backpressure regulator/relief valve
for spring settings range from 0.14 to 2.6 bar /
2 to 38 psig, available for 1/4 NPT to DN 25 / 1 in.
body sizes only
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
Type MR98LD: Di󰀨erential pressure relief valve
for di󰀨erential set pressures range from 0.14 to
2.6 bar / 2 to 38 psi with maximum inlet/outlet
pressure up to 10.3 bar / 150 psi, available for
1/4 NPT to DN 25 /1 in. body sizes only
Available Constructions (continued)
Type MR98HD: Di󰀨erential pressure relief valve
for di󰀨erential set pressures from 0.34 to
13.8 bar / 5 to 200 psi with maximum inlet/outlet
pressure up to 20.7 bar / 300 psi
Type MR98HDP: Di󰀨erential pressure relief valve
for di󰀨erential set pressures range from 0.34 to
13.8 bar / 5 to 200 psi with maximum inlet/outlet
pressure up to 41.4 bar / 600 psi
Type MR98HHD: Di󰀨erential pressure relief valve
for di󰀨erential set pressures range from 10.3 to
25.9 bar / 150 to 375 psi with maximum inlet/outlet
pressure up to 27.6 bar / 400 psi
Body and Orice Sizes
1/4 NPT body: 7.22 mm / 0.284 in. orice
DN 15 / 1/2 in. body:
10.56 mm / 0.416 in. orice
DN 20 and 25 / 3/4 and 1 in. bodies:
16.02 mm / 0.631 in. orice
DN 40 and 50 / 1-1/2 and 2 in. bodies:
29 mm / 1.142 in. orice
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 anges (for welded end
connections) and are EN anged 356 mm /
14 in. face-to-face
Set Pressure Ranges
(1)
See Table 1
Maximum Cold Working Pressures of Body Size
and Materials
(1)
See Table 2
Maximum Inlet, Outlet and Spring Case
Pressure Ratings
(1)
See Table 2
1. The pressure/temperature limits in this Installation Guide and any applicable standard or code limitation should not be exceeded.
TYPE PRODUCT SIZE BODY MATERIAL CATEGORY
All
1/4 NPT, DN 15 to
25 / 1/2 to 1 in.
All available
materials
SEP
MR98H/MR98HD/
MR98HDP
DN 40 and 50 /
1-1/2 and 2 in.
Steel and
Stainless Steel
II

Emerson MR98LD Specifications

General

Brand	Emerson
Model	MR98LD
Category	Control Unit
Language	English