627 Series Pressure Reducing Regulators0 pages

Bulletin 71.1:627
March 2013

627 Series Pressure Reducing Regulators
Introduction
The 627 Series direct-operated pressure reducing
regulators (Figure 1) are for low and high-pressure
systems. These regulators can be used with natural
gas, air, or a variety of other gases. Performance
characteristics vary according to construction (see the
Specifications section).

Features
•t Internal Relief Valve—Types 627R, 627LR, and
627MR regulators have an internal relief valve, which
in many cases eliminates the usual requirement for
an external relief valve, thereby reducing equipment
and maintenance costs. Refer to the Specifications
section for performance data.
•t Types 627R, 627LR, and 627MR Travel Stop— The
internal relief valve still works if the disk or linkage fails.
The pusher post (Figure 6) contacts the travel stop of
the lever retainer and, as the diaphragm continues to
rise, it opens the relief valve.
•t Relief Operation Indicator—A rubber cap (Figure 7)
slipped on the vent assembly pops off when the relief
valve opens, indicating the relief valve has opened
since the last inspection.
•t Easy to Maintain—Trim parts can be replaced without
removing the regulator body from the pipeline. A
two-bolt connection between the body and diaphragm
casing simplifies disassembly for maintenance.
•t Installation Adaptability—The diaphragm case and/
or regulator body can be rotated in any of four positions
to allow regulator installation in locations with limited
space (Figure 8). The regulator may be installed in
any position without affecting operation as long as the
spring case vent is protected from the elements.

Figure 1.  Typical 627 Direct-Operated Pressure
Reducing Regulator

•t Extended Body Option—The Type 627 Long Body
is available with same face-to-face dimensions as the
Type 630 with threaded NPT end connections.
•t Tamper-Resistant—An adjusting screw locknut and
protective cap (Figure 2) is standard on all
627 Series regulators to discourage tampering with
the pressure setting.
•t Wide Range of Flow Capabilities—A selection of
body sizes and orifice sizes is available to satisfy
various flow requirements.
•t Tight Shutoff Capability—A flat-faced disk of
Nitrile (NBR), Nylon (PA), or Fluorocarbon (FKM)
provides excellent shut-off capability.

D101331X012

•t Application Versatility—The different 627 Series
constructions can be used as farm tap regulators,
regulator-relief valves, monitoring regulators, or
high-pressure industrial regulators.

W4793

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