Types 98LD and 98HD
D100259X012
Instruction Manual
Form 1571
September 2009
Types 98LD and 98HD Differential Pressure
Relief Valves
W6157
W6158
Figure 1. Types 98LD and 98HD Differential Pressure Relief Valves
TYPE 98LD
TYPE 98HD
www.emersonprocess.com/regulators
!
WARNING
Failure to follow these instructions or
to properly install and maintain this
equipment could result in an explosion,
causing property damage and personal
injury or death.
Fisher
®
relief valves must be installed,
operated, and maintained in accordance
with federal, state, and local codes,
rules, and regulations, and Emerson
Process Management Regulator
Technologies, Inc. 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.
service the unit.
Installation, operation, and maintenance
personnel may result in improper
adjustment and unsafe operation. Either
condition may result in equipment
personnel when installing, operating,
and maintaining the Types 98LD and
HD differential pressure relief valves.
.
Introduction
Scope of the Manual
This manual provides instructions for the installation,
maintenance, and parts ordering information of
Types 98LD and 98HD Differential Relief Valves.
Instructions and parts lists for other equipment
mentioned in this instruction manual are found in
separate manuals.
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