Emerson FL Instruction Manual
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Emerson FL Instruction Manual

Emerson FL Instruction Manual

Fl series pressure reducing regulators
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Instruction Manual
Form 5733
July 2004
FL Series Pressure Reducing Regulators
E0820
Type FL
Introduction
Scope of Manual
This manual provides instructions for installation,
adjustment, maintenance, and parts ordering for the FL
Series regulators.
Description
The FL Series regulators are accurate pilot-operated,
pressure balanced, soft seated regulators designed for
high pressure transmission/city gate, large capacity
distribution systems and power plant feeds. The FL
Series provides smooth, quiet operation, tight shutoff and
long life. The regulator utilizes a main valve actuator, a
Type PRX pressure reducing pilot, and a Type SA/2 pilot
Figure 1. Type FL and Type MFL with Type SRS Silencer
www.FISHERregulators.com
E0821
Type MFL with Type SRS Silencer
supply pressure regulator. The Type PRX pilot uses inlet
pressure reduced by a Type SA/2 supply pressure
regulator, as loading pressure to operate the main valve
actuator. The outlet pressure is sensed through a
control line on the main valve actuator and also on the
Type PRX pilot diaphragm.
Specifications
The Specifications section gives some general specifi-
cations for the FL Series regulators. The nameplates
give detailed information for a particular regulator as it
comes from the factory.
FL Series

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Summary of Contents for Emerson FL

  • Page 1 E0821 E0820 Type MFL with Type SRS Silencer Type FL Figure 1. Type FL and Type MFL with Type SRS Silencer Introduction Scope of Manual supply pressure regulator. The Type PRX pilot uses inlet This manual provides instructions for installation,...

  • Page 2: Specifications

    80, 100, and 150) (6-inch for FL only) FL and MFL with SRS Silencer (inlet x outlet): 1 x 4, 1-1/2 x 6, 2 x 6, 2-1/2 x 8, 3 x 10, 4 x 10, and v l i...
  • Page 3 OUTLET PRESSURE LOADING PRESSURE PILOT SUPPLY PRESSURE ATMOSPHERIC PRESSURE Figure 2. Type FL Operational Schematic keeps the customer on line. Also, testing is relatively Working Monitoring Regulators (figure 3) easy and safe. To perform a periodic test on a monitor-...

  • Page 4: Installation And Startup

    Type PRX/125 or PRX/125-AP monitoring pilot for the main valve matches the flow direction of process the upstream regulator and a Type FL with the appropri- fluid through the regulator. ate Type PRX/120 or PRX/120-AP pilot for the down- stream regulator.
  • Page 5 FL Series TYPE PRX/120 OR PRX/120-AP TYPE SA/2 4 x A 6 x A Single Pilot System Installation TYPE PRX/120 OR TYPE PRX/120 OR PRX/120-AP PRX/120-AP TYPE SA/2 4 x A 6 x A Upsteam or Downstream Wide-Open Monitoring System Installation...
  • Page 6 Type FL-PRX regulator is the pressure setting of the conditions are in effect: pilot control spring. Turning the adjusting screw •...
  • Page 7 Installation may occur due to reverse pressurization of the pilot and main valve components. All Type FL working monitor regulators are bench set at the factory according to the service conditions specified Always use pressure gauges to monitor on the customer’s order. Examine the unit on arrival to downstream pressure during startup.
  • Page 8 FL Series Startup 3. Adjust the second-stage working regulator to the desired distribution pressure by following instructions 1. Before introducing any pressure to the unit, close for that particular regulator. hand valve A in the distribution pressure control line and 4.

  • Page 9: Maintenance

    FL Series If the downstream control line taps into the pipe- 4. Reinstall the pad. line below the downstream isolating valve, close hand valve B. Then open vent valve C and vent valve D, Main Valve Diaphragm Maintenance permitting all pressure to bleed out of the regulator.
  • Page 10 FL Series Inspect the parts for damage or wear, and replace if 9. Set the upper diaphragm plate (key 13) on top of necessary. the diaphragm (key 14). 5. Remove orifice (key 19) and O-ring (key 17). 10. Place washer (key 11) and stem nut (key 26) on...

  • Page 11: Parts Ordering

    11-character part kit number. O-Ring O-Ring Washer * Indicates Recommended Spare. FL Series Parts Kit Part Numbers S IZ E , IN C H E S (D N ) M A T E R IA L 1 (DN 25) 1-1/2 (DN 40)
  • Page 12 FL Series Figure 4. FL Assembly...
  • Page 13 FL Series Figure 5. SRS Assembly SRS Main Valve (figure 5) Description Gasket Flange Spacer Body Retainer Stud Atenuator Plate Spring Pin Flange Atenuator Plate Atenuator Plate Spacer Spring Cage Spring...
  • Page 14 FL Series TYPE PRX/120-AP OR PRX/125-AP TYPE PRX/120 OR PRX/125 TYPE PRX/120 OR PRX/125 TYPE PRX/120-AP OR PRX/125-AP Figure 6. PRX Series Pilot Assembly...
  • Page 15 FL Series PRX Series Pilots (figure 6) Description Part Number Elastomer Parts Kits (includes keys: 4, 5, 14, 17, 18, 25, and 28) Types PRX/120 and PRX/125 Nitrile GD89982X012 Fluoroelastomer GD89982X022 Types PRX/120-AP and PRX/125-AP Nitrile GD89982X012 Fluoroelastomer GD89982X022 Description...
  • Page 16 FL Series Fisher is a mark owned by Fisher Controls International, Inc., a business of Emerson Process Management. The Emerson logo is a trade mark and service mark of Emerson Electric Co. All other marks are the property of their respective owners.

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