Pietro Fiorentini Aperflux 851 Regulator
The Aperflux 851 is a high-performance downstream gas pressure regulator designed for medium- and high-pressure applications. Self-actuated and pilot-operated, this robust regulator is ideal for use in natural gas distribution networks, as well as civil and industrial installations requiring precision, responsiveness, and safety. Its top-entry design allows for full maintenance without removing it from the pipeline, minimizing downtime and simplifying service.
This model is particularly well-suited for applications with rapid flow changes, such as ON-OFF burners or industrial processes. With a fail-to-open configuration, the Aperflux 851 provides reliable gas flow even in the event of pilot diaphragm failure or loss of sensing pressure.
Key Benefits
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Pilot-operated, self-actuated regulator for accurate downstream pressure control
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Top-entry design allows for easy in-line maintenance
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Fail-open functionality ensures gas flow during pilot circuit failure
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Fast response to operating condition changes, including sudden load variation
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High turn-down ratio with precise pressure regulation
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Compatible with various pilot systems and optional accessories
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ANSI/UNI/DIN flanged connections in sizes 1” to 10”
Technical Highlights
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Max Inlet Pressure: Up to 1,450 PSIG (depending on configuration)
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Outlet Pressure Range: 11.6 – 1,073 PSIG, depending on pilot model
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Min Differential Pressure: Recommended 7.25 PSIG (30 PSIG ideal)
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Temperature Range: -40°F to +140°F with appropriate installation conditions
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Accuracy Class (AC): Up to 1%
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Lock-up Pressure (SG): 2.5%–5% depending on outlet pressure
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Noise Reduction: Optional DB/851 silencer reduces sound at the point of throttling
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Slam-Shut Devices: Available models SB/82 and HB/97 for over/under-pressure protection
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Integrated Monitor: Optional PM/819 safety monitor ensures continuity if the main regulator fails
Common Applications
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Natural gas gate stations
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Industrial gas delivery systems
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Civil gas distribution networks
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Burner systems requiring fast pressure response
Optional Accessories
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Slam shut valves (OPSO/UPSO)
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In-line safety monitor
Related Resources
Description |
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Aperflux 851 Brochure.pdf |
PF Aperflux 851 Diagram.pdf |