Types 1808 and 1808A
D100347X012
Instruction Manual
Form 5116
July 2010
www.fisherregulators.com
Types 1808 and 1808A Pilot-Operated Relief
Valves or Backpressure Regulators
!
WARning
Failure to follow these instructions or
to properly install and maintain this
equipment could result in an explosion
and/or fire causing property damage and
personal injury or death.
Fisher
®
backpressure regulators or
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. Only a qualified person must
install or service the unit.
Call a gas service person to service
the unit. Only a qualified person must
install or service the regulator.
introduction
Scope of the Manual
This manual provides installation, adjustment,
maintenance, and parts ordering information for
Types 1808 and 1808A pilot-operated relief valves or
backpressure regulators. The manual also includes
coverage of the Types 6358 and 6358B pilots and, if
used, a P590 Series filter. Instructions and parts lists
for other equipment used with these regulators are
found in separate manuals.
Description
Types 1808 globe-body and 1808A angle-body,
pilot-operated backpressure regulators or relief valves
W3716
TyPE 1808 glOBE-BODy
W3507
TyPE 1808A AnglE-BODy
Figure 1. Types 1808 and 1808A Pilot-Operated
Relief Valves or Backpressure Regulators
are economical, compact devices used in either
gas or liquid service to maintain pressure on oil and
gas separators and in pressure relief applications
in gas distribution systems. The Type 6358 pilot is
used in backpressure regulation and pressure relief
applications throughout the oil and gas production
industry, and is used in either gas or liquid service.
Pressure relief and liquid service applications in
