Emerson 1808 Series Relief Valve or Backpressure Regulator Handbook

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Types 1808 and 1808A
D100347X012
Instruction Manual
Form 5116
July 2010
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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 lter. Instructions and parts lists
for other equipment used with these regulators are
found in separate manuals.
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Types 1808 globe-body and 1808A angle-body,
pilot-operated backpressure regulators or relief valves
W3716
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W3507
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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