Type FL Relief or Backpressure Regulator0 pages

Bulletin 71.4:FL
May 2012
Type FL Relief or Backpressure Regulator
P1667
Figure 1. Type FL Relief Valve or Backpressure Regulator
Features
Introduction
• Versatility—A wide variety of applications such as
medium to high-pressure natural gas transmission and
distribution systems, power plants, monitors, and sour gas.
• Tight Shutoff—A combination of soft seat and metal plug
with a knife edge provides a long lasting reliable shutoff.
• Easy Startup—Equal inlet and outlet pressure ratings
allow easier startup and shutdown.
• high Capacity—Up to NPS 10 / DN 250 body size, the
body design and flow passage allows exceptionally high
capacities with a maximum Cg of 30,600 - 2:1 line size.
• In-Service Travel Indicator—The travel indicator with
protective cover, responds to the precise movement of
the diaphragm and plug assembly and shows the actual
valve position.
TM
Type FL relief valve or backpressure regulator is accurate,
pilot-operated, and designed for high-pressure transmission/
city gate, large capacity distribution systems, and power
plant feeds. Type FL provides smooth, tight shutoff, and
long service life. The relief valve or backpressure regulator
utilizes a main valve actuator, a Type PRX/182 pressure
reducing pilot.
The regulator’s superior performance is due to the amplifying
effect of the pilot and two-path control system. Changes
in inlet pressure act quickly on the actuator diaphragm to
provide fast response to system change.
Type PRX/182 Pilot Description
A Type PRX/182 pressure reducing pilot has the ability to
handle a wide range of setpoints from 29 to 1160 psig /
2.00 to 80.0 bar.
www.tartarini-naturalgas.com
D103581X012
• Control Accuracy—Keeps constant inlet pressures
to downstream equipment by accurately controlling
system pressures at widely varying flow rates and supply
pressures for maximum efficiency and best operation.