Type FL Pressure Reducing Regulators0 pages

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Bulletin 71.2:FL

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April 2012

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Type FL Pressure Reducing Regulators

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Features

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• No Atmospheric Bleed—Type FL eliminates nuisance

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and wasteful bleed gas to atmosphere by utilizing a

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two-path pilot-operated control system, which bleeds

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100% of the gas to the downstream system while the

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regulator is operating.

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• Quiet Operation—Optional noise abatement

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systems are available.

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• Control Accuracy—Keeps constant inlet

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pressures to downstream equipment by accurately

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controlling system pressures at widely varying flow

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rates and supply pressures for maximum efficiency and

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best operation.

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• Versatility—A wide variety of applications such

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as natural gas transmission and distribution systems,

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power plants, monitors, and sour gas with inlet

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pressures up to 1480 psig /102 bar.

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• Easy In-Line Maintenance—With the optional

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outlet flange spacer, trim parts such as the disk holder

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can be inspected, cleaned, and replaced without

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removing the body from the pipeline.

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• Tight Shutoff—A combination of soft seat and

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metal plug with a knife edge creates the seal.

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• Easy Startup—Equal inlet and outlet pressure

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ratings allow easier startup and shutdown.

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• High Capacity—Up to NPS 10 / DN 250 body

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size, the body design and flow passage allows

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exceptionally high capacities with a maximum

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Cg of 51,500 - 2:1 line size.

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• In-Service Travel Indicator—The travel indicator

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with protective cover, responds to the precise movement

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of the diaphragm and plug assembly and shows the

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actual valve position.

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Introduction

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Type FL regulator is accurate, pilot-operated, pressure

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balanced, soft-seated regulator designed for high-pressure

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transmission/city gate, large capacity distribution systems,

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and power plant feeds. Type FL provides smooth and quiet

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operation, tight shutoff, and long service life. The regulator

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utilizes a main valve actuator, a Type PRX pressure reducing

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pilot, and a Type SA/2 pilot supply pressure regulator.

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Figure 1. Type FL Regulator with Type PRX Pilot

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Type PRX pilot uses inlet pressure reduced by a Type SA/2

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supply pressure regulator, as loading pressure to operate the

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main valve actuator. The outlet pressure is sensed through

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a control line on the main valve actuator and also on the

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Type PRX pilot diaphragm.

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The regulator's superior performance is due to the amplifying

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effect of the pilot and two-path control system. Changes

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in outlet pressure act quickly on the actuator diaphragm

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to provide fast response to system change. Then the pilot

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amplifies any small system changes to position the main valve

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for precise pressure control.

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Type PRX Pilot Descriptions

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A pressure reducing pilot that has the ability to handle a wide

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range of setpoints from 14.5 to 1160 psig /1.00 to 80.0 bar

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in two versions:

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Type PRX/120: A pressure reducing pilot with an outlet

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pressure range of 14.5 to 435 psig /1.00 to 30.0 bar.

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Type PRX/120 can be used as the pilot on single stage

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pressure-reducing regulators or as the monitor pilot or as the

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working pilot in wide-open monitor systems.

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C

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O

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cn

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CD

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TARTAR/A/P

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www.tartarini-naturalgas.com

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EMERSON.

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Process Management

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