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.

The Specifications section gives some general specifications for the Type FL relief valve or backpressure regulator. The nameplates give detailed information for a particular regulator as it comes from the factory. Available Configuration Type FL: Pilot-operated relief or backpressure regulator for medium to high set pressures Body Sizes Main Valve End Connection Style and Pressure Ratings111 Maximum Inlet and Outlet (Casing) Pressure111 Set (Control) Pressure Ranges Pilot Regulator Flow Coefficients Pilot Connections Pressure Registration Approximate Weights (Including Pilot) Construction Materials...

A-SENSING PORT Figure 2. Type FL Relief Valve or Backpressure Regulator Operational Schematic Table 2. Pilot Set Pressure Build-Up

SOCKET HEAD Figure 3. Outlet Flange Spacer Installation Table 3. Flow and Sizing Coefficients A pressure relief valve is a throttling pressure control device that opens and closes to ensure the downstream pressure does not rise above a predetermined pressure. Tartatini™ relief valves cannot be used as ASME safety relief valves. A backpressure regulator is a device that controls and responds to changes in the upstream pressure. It functions the same as a relief valve in that it opens on increasing upstream pressure. Relief Valve As long as the inlet pressure is below the set pressure, the pilot...

Table 4. Relief Capacities pressure, pushes the diaphragm and plug assembly onto the knife-edged seat, producing tight shutoff. Type FL relief valve or backpressure regulator is installed in a horizontal or vertical pipeline as long as flow through the body matches the flow arrow on the main valve. An optional outlet flange spacer (Figure 3) is available to be installed downstream of the regulator. Once the spacer and outlet flange are removed, the disk holder and trim parts are easily accessed. Dimensions are given in Figure 4. Type FL may be installed in any position, but is normally installed...

Bulletin 71.4:FL Ordering Information Carefully review each specification in the Specifications section, then complete the Specification Worksheet on page 8. If a pilot setpoint is not requested, the regulator will be set at the approximate midrange. Ordering Guide Body Size (Select One) Set Pressure Range (Select One)   Type FL   Type PRX/182    (Same Inlet and Outlet Size)                        NPS 1 / DN 25**   NPS 2 / DN 50**   NPS 3 / DN 80**   NPS 4 / DN 100**   NPS 6 / DN 150**   NPS 8 / DN 200**   NPS 10 / DN 250** End Connection Style (Select One)       CL300 RF**   CL600 RF** O-Ring...

Specification Worksheet Line Size_ Fluid Type_ Specific Gravity_ Does the Application Require Overpressure Protection? Maximum Inlet Pressure_ Minimum Inlet Pressure_ Differential Pressure_ I Less Than or Equal To: I Construction Material Requirements (if known): Industrial Regulators Emerson Process Management Middle East and Africa Dubai, United Arab Emirates Emerson Process Management Emerson Process Management Tescom Corporation For further information visit www.emersonprocess.com/regulators The Emerson logo is a trademark and service mark of Emerson Electric Co. All other marks are the property...