627F Pressure Reducing Regulator0 pages

Bulletin 71.2:627F
February 2013

Type 627F Pilot-Operated Pressure
Reducing Regulator

W5607-1

W5641-1

Figure 1. Type 627F Pressure Reducing Regulators

The Type 627F pilot-operated (Type 6351F pilot)
pressure reducing regulator (Figure 1) provides
superior performance when used in pressure-factor
measurementt(fixed-factortbilling)tapplications.ttThet
t
Type 627F includes a factory-installed Type 6351F
pilottandthastexternaltregistrationtthattrequirestat
downstream control line.

Features
• Accurate for Pressure-Factor Measurement
Applications—Pilot action controls pressure to
within ±1 percent of the absolute outlet pressure
(psia) setting at full valve disk travel, resulting in
higher capacity than could be obtained without
a pilot. This capability results in low-pressure
variationstovertbroadtflowtrangestandtinlett
t
pressure ranges.

pipeline. A two-bolt connection between the body
andtdiaphragmtcasingtsimplifiestdisassemblyt
t
for maintenance.
• 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. The regulator may be
installed in any position without affecting operation
as long as the spring case vent is protected from
the elements.
• Tamper-Resistant—An adjusting screw locknut
and protective cap (Figure 2) is standard on all
Type 6351F pilots to discourage tampering with
the pressure setting.
• Wide Range of Flow Capabilities—A selection of
bodytandtorificetsizestistavailablettotsatisfyt
t
varioustflowtrequirements.
t
• Tight Shutoff Capability—Atflat-facedtdisktoft
t
Nitrilet(NBR)tprovidestexcellenttshutofftcapability.t

• Easy to Maintain—Trim parts can be replaced
without removing the regulator body from the

www.fisherregulators.com

D101544X012

Introduction