FL series
20Pages

PRESSURE REGULATORS Process Management

FL Regulators Pressure Regulators This series of axial flow appliances was designed to meet a wide range of applications. Worldwide customer appreciation is based on the reliability and versatility of this product. The main features are as follows: • Greater flow rates than “top entry” regulators Counterbalanced shutter Fabric reinforced diaphragm Modularity design

ID-ABREVIATIONS Configurations Low Pressure PN 16/25 - ANSI 150 Standard High Pressure ANSI 300/600 Standard MFL-BP-SR MFL-BP-SRS MFL-SRS MFL-SRSII BFL-SRS BFL-SRSII Note : Types SRII and SRSII silencers are not available for DN 40 and DN 65 sizes. Size DN 200 is available only with SRII or SRSII silencers, size DN 250 is available only with SRII silencer. SRS/SRSII silenced solutions have a widened output flange. Also available: SRS-R reinforced version; version with widened output but without a built-in silencer.

FL Regulators Operation Travel Indicator Monitor seal pad Travel Indicator Monitor spring Regulator spring Monitor shutter Regulator shutter Regulated pressure chamber (Pd) Regulated pressure chamber (Pd) Diaphragm unit Diaphragm unit Loading chamber (Pm) Monitor Loading chamber (Pm) Regulator HOW THE REGULATOR WORKS The diaphragm unit (assembled to the shutter) divides the regulator control head into two chambers. One of the chambers is connected to regulated outlet pressure (Pd), and the other to loading pressure (Pm) produced by the pilot according to pressure downstream. Due to reduced...

Shut-off spring Shut-off shutter Shut-off reset shaft HOW THE SHUT-OFF DEVICE WORKS The slam-shut device has a shutter and individual seat. It functions independently of the regulator/monitor. The shutter can only be hand-opened, by rotating the slam-shut reset shaft counter clockwise. To keep the shutter open, the actuator-pilot series OS/80X or OS/80X-PN is used. Both series are designed to operate on maximum and minimum, maximum only, or minimum only pressure. When the system’s downstream pressure is at normal operating value, the actuator-pilot remains set and prevents the slam-shut...

FL Regulators Features Applications FL series regulators are used in reduction, distribution and conveying stations of suitably filtered natural gas. They can also be used for air, propane, butane, LPG, city gas, nitrogen, carbon dioxide and hydrogen. Technical Features Flange rating PN 16/25 - ANSI 150 Allowable pressure Inlet pressure range Set range Min. operating differential pres. Flange rating ANSI 300/600 Allowable pressure Inlet pressure range Set range Min. operating differential pres. Functional Features Accuracy class Lock-up pressure class Class of lock-up pressure zone Shut-off...

FL Regulators Calculation Procedures Q P1 P2 Cg C1 d Natural gas flow rate in Stm3/h Absolute inlet pressure in bar Absolute outlet pressure in bar Flow rate coefficient Body shape factor Relative density of the gas FL-BP* FL-BP-SR* FL* FL-SR* FL-BP-SRS FL-/SRS MFL-BP* MFL-BP-SR* MFL-BP-SRS BFL-BP* BFL-BP-SR* BFL-BP-SRS MFL* MFL-SR* MFL-SRS BFL* BFL-SR* BFL-SRS (*) Values also apply to widened outlet versions Note: For other configurations, please contact our Technical Department. Sub-critical state with: Q = 0.525 ⋅ Cg⋅ P1⋅ sin 3417 ⋅ C1 Critical state with: P2 ≤ Carbon dioxide For other...

Calculate the required Cg with the following formula: Sub-critical with: P2 > Critical state with: P2 ≤ P1 Cg = N.B. The above formulas apply to natural gas flow rate only. If the flow rate value (Q) refers to other gasses, divide it by the correction factor F (see table). Select the diameter of the regulator with Cg higher than calculated value (see table). After finding the DN of the regulator, check that gas speed on the seat does not exceed 120 m/sec, using the following formula: V = 345.92 ⋅ V = Velocity (m/s) 345.92 = Numerical constant Q = rate under standard conditions (Stm3/h) Flow...

FL Regulators Pilot The following pilots are used with BFL series regulator with built-in shut-off device: • OS/80X series: Spring loaded pneumatic device • OS/80X-PN series: Pneumatic device controlled by PRX series pilots The OS/80X series pilot is supplied in different models according to set ranges required. Technical Features Model Servomotor Body Resistance (bar) OS/80X Servomotor body Diaphragm O-ring OS/80X-BP, OS/80X-BPA-D OS/80X-MPA-D, OS/80X-APA-D Nitrile NBR with PVC coating Nitrile NBR, fluorocarbon FKM OS/84X, OS/88X Servomotor body Lip seal O-ring Aluminum Steel Brass Teflon...

FL Regulators Pilots PS/ Series FL series regulators are equipped with the PS/ or PRX/ series pilots. Application Body and Covers Material 1/4” NPT female threaded connections Application Regulator or Monitor Operating Monitor Regulator Body and Covers Material Steel 1/4” NPT female threaded connections All PS/ series pilots are supplied with a filter (5µ filtering degree) and built-in pressure stabilizer, with the exception of pilots PSO/79 and PSO/80. Application Regulator or Monitor Operating Monitor Regulator Body and Covers Material Steel 1/4” NPT female threaded connections The SA/2...

FL Regulators Operating Monitor and Booster Valve OPERATING MONITOR The “operating monitor” has two functions: under normal duty, it reduces pressure in the intermediate section between the two regulators, but, if the main regulator fails, it comes into operation as an emergency regulator. Operating Monitor BOOSTER VALVE The booster valve is fitted on the monitor-regulator system which branches off from the monitor drive pressure circuit, so that the monitor operates more quickly. For size DN 250 the booster valve is always installed also on the regulator. Inlet pressure Intermediate...

Built-in multi-path or split-flow silencer Beyond 80 m/s, it could be necessary to reduce the noise generated by the expansion cone usually installed downstream of the regulator. This silencer is fitted near the regulator shutter and is highly efficient up to a theoretical gas velocity of 80 m/s calculated at the outlet flange. Noise of non silenced regulator dB (A) Sound Performance Level Noise characteristics are very similar to the standard SR. The SRII silencer is the next generation of Type SR and is used in case of extreme service conditions (dirty gas, high pressure drops, and high...