Fisher 6492HTM Instruction Manual

Instruction Manual
Form 5135
November 2009
Type 92C Steam Regulator
WaRning
!
Fisher regulators 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.
installation, operation, and maintenance
procedures performed by unqualified
personnel may result in improper
adjustment and unsafe operation. Either
condition may result in equipment
damage or personal injury. Use qualified
personnel when installing, operating, and
maintaining the Type 92C regulator.
introduction
Scope of the Manual
This instruction manual provides installation,
maintenance, and parts ordering information for the
Type 92C steam self-powered control valve and the
Type 6392 pilot. Both the pilot-operated and the
pressure-loaded constructions are covered. The
Type 92C is also available with a Type 6492HM or
6492HTM safety override pilot. The pressure-loading
device and accessories used with this valve are
covered in other manuals.
Description
The Type 92C steam regulator is a cast iron, steel, or
stainless steel pressure-reducing regulator for steam or
hot air service. This regulator is available with a Type 6392
pilot for use as a pilot-operated regulator (Figure 1) or
without a pilot for use as a pressure-loaded regulator. The
pilot-operated version uses inlet pressure as the operating
medium; no separate air supply is required. The pressure-
loaded version is used where remote adjustment of the
regulator pressure setting is required; a 67 or 1301 Series
regulator or 670 Series panel-mounted regulator may be
used as the loading regulator.
Figure 1. Type 92C Pilot-Operated Regulator
A Type 6492HM (or 6492HTM) safety override pilot
is also available for the Type 92C. The Type 6392 pilot
is used in a series installation with the Type 6492HM
(or 6492HTM) safety override pilot installed on the
upstream valve. The Type 6492HM (or 6492HTM)
safety override pilot senses pressure downstream
of the second valve, and prevents pressure from
rising above safe operating pressure in the event the
downstream valve fails. This system is approved by
ASME B31.1-1989, 122.14.2.A, and can replace an
ASME safety valve when vent piping is not practical
and upstream pressure does not exceed 400 psig
(27,6 bar). Local codes and standards may
require approval by an appropriate authority prior
to installation.
The Type 92C safety override system
does not provide positive shutoff in
dead end service. it is intended for
large distribution systems where steam
leakage will condense before steam
pressure builds up. Downstream piping
and components must be rated for
maximum upstream steam pressure for
dead end service. Failure to do so could
cause personal injury or death.
www.fisherregulators.com
Type 92C
WaRning
!