W4793
627B Series Pressure Reducing Regulators
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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™ 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.
If the regulator vents gas or a leak develops in
the system, service to the unit may be required.
Failure to correct trouble could result in a
hazardous condition.
Call a gas service person to service the unit.
Only a qualified person must install or service
the regulator.
Figure 1.
Typical 627B Direct-Operated
Pressure Reducing Regulator
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WARNING
Personal injury, property damage, equipment
damage or leakage due to escaping gas or
bursting of pressure-containing parts may
result if this regulator is overpressured or
is installed where service conditions could
exceed the limits given in the Specifications
section, Tables 1 and 2 or where conditions
exceed any ratings of the adjacent piping or
piping connections.
To avoid such injury or damage, provide
pressure-relieving or pressure-limiting devices
(as required by the appropriate code, regulation
or standard) to prevent service conditions from
exceeding those limits.
Additionally, physical damage to the regulator
could cause personal injury or property
damage due to escaping gas. To avoid such
injury or damage, install the regulator in a
safe location.
Introduction
Scope of the Manual
This manual provides instructions for the installation, adjustment,
maintenance and parts ordering information for the 627B Series
Regulators. These regulators are usually shipped separately for
line installation, although sometimes they are shipped installed
on other equipment. Refer to the Instruction Manual of the other
equipment for installation and operating instructions.
Description
The 627B Series Direct-Operated Pressure Reducing
Regulators (Figure 1) are for high and low pressure systems.
These regulators can be used with natural gas, air or a variety
of other gases. Performance characteristics vary according
to construction.
Instruction Manual
D104602X012
December 2021
627B Series
