Pietro Fiorentini Mod FEX Regulator

The Pietro Fiorentini Mod FEX Regulator is a two-stage, spring-loaded, self-operated regulator designed for use with natural gas, LPG, and other non-corrosive gases in commercial and industrial settings. Engineered for both meter-mounted and pipeline installations, the FEX regulator offers high performance and reliability across a wide range of inlet pressures.

With its balanced valve design and built-in safety mechanisms—including overpressure and underpressure shut-off—the FEX ensures precise regulation and enhanced protection, even under varying load conditions. The unit can be installed in any orientation, provided the vent is properly protected from weather or piped outdoors in enclosed installations.

Key Benefits

• Two-stage regulation for accurate and stable outlet pressure

• Reliable operation across a wide inlet pressure range

• Built-in safety devices protect against over/under pressure events

• Top-tier reliability and performance from Pietro Fiorentini

• Approved to UNI 8827, ANSI B109.4, and CSA B149 standards
   

Features

• Balanced double-stage design for consistent delivery pressure

• Built-in 100 μm inlet filter to prevent debris from entering system

• Optional overpressure and underpressure shut-off devices (OPSO/UPSO)

• Manual reset safety shut-off feature for added security

• Compact design with weather-resistant finish
   

Benefits

• Reduces maintenance and improves regulator lifespan

• Delivers stable pressure, even with inlet pressure fluctuations

• Suitable for meter and inline pipeline mounting

• Ideal for both indoor and outdoor environments

• Easy integration into new or existing systems
   

Capability

• Inlet pressure range: 7.25–125 PSIG

• Outlet pressure range:

  • BP: 5.2–40.1” WC

  • MP: 40.1” WC–5 PSIG

• OPSO Setting Range:

  • BP: 12.8–64.3” WC

  • MP: 62.2–180.8” WC

• UPSO Setting Range:

  • BP: 2.4–32.1” WC

  • MP: 32.1–80.3” WC

• Flow capacity: 3,500 SCFH

• Accuracy Class: AC 5/10%

• Lock-up Pressure Class: SG 30%
   

Construction

• Body & Cover: Aluminum Al GD-AlSi12

• Surface Treatments: Sandblasted, phosphated, and powder coated

• Temperature Range:

  • Ambient: -40°F to +140°F

  • Flowing Gas: -4°F to +140°F

• Weight: 6.4 lbs

• Mounting: G1” and G1-1/2” ISO 7/1 threaded connections