Pietro Fiorentini Aperval Regulator

The Pietro Fiorentini Aperval is a pilot-operated gas pressure regulator designed for medium- and low-pressure applications. Its fail-open design makes it a reliable solution for maintaining flow even under adverse conditions such as diaphragm failure or loss of sensing line pressure. With a modular, top-entry construction, the Aperval allows for easy field maintenance and retrofitting of optional features like emergency monitors, slam shut valves, or silencers—without modifying the main piping.

This regulator is ideal for natural gas and other filtered, non-corrosive gases, particularly in industrial, commercial, and utility environments that demand high regulation accuracy and stability.

Key Benefits

• Fail-open safety design for continuous gas flow under failure conditions

• Modular structure enables retrofitting of monitors, silencers, or slam shut valves

• Top-entry design allows easy in-line maintenance

• Balanced valve for stable outlet pressure across varying inlet conditions

• Compact, cost-effective regulator with high turndown ratio and low operating ΔP

Features

• Designed for medium/low-pressure natural gas systems

• Available with silencer, slam shut, or incorporated emergency monitor

• Manual or remote pilot adjustment options

• Range of sizes: 1” to 4”, ANSI 150 RF or RTJ flanging

• Class-leading accuracy and flow stability
   

Benefits

• Enhances safety with fail-open and slam shut options

• Lowers installation and maintenance costs via modular design

• Minimizes gas emissions with built-in silencer option

• Reduces downtime due to simple in-line serviceability

• Meets global performance and safety standards (ANSI B16.5, ISO 7005, EN 334)
   

Capability

• Operates from 7.25 to 362 PSIG inlet pressure

• Outlet pressure ranges: 2" WC to 137.5 PSIG depending on pilot type

• Supports emergency pressure shut-off, over/under pressure protection

• Suitable for ON-OFF burner applications and variable load conditions

• Compatible with Pietro Fiorentini monitoring and automation accessories
   

Construction

• Body materials: Cast steel or ductile iron

• Valve seat: Technopolymer

• Diaphragm: Vulcanized rubber

• Seals: Nitrile rubber

• Flange options: ANSI 150, PN25/40

• Ambient operating range: -40°F to 140°F (with carbon steel body)