Pressure Relief Device – Pilot Operated-F70PR

Flow Safe, Inc.

Precision-machined components for high-quality performance
Overpressure protection for gas/vapor service compliant with ASME Section XIII
Plastic seat design that provides zero leakage
Available in various material configurations
Adjustable blowdown capabilities for precise control of reseat characteristics

The FLOW SAFE F70PR Series pilot-operated relief valve provides overpressure protection with the ability to relieve large volumes and provide consistent, leak-tight seating. This valve series is intended for installations where ASME Code construction is not required. Standard construction of the main valve assembly includes threaded (in the 1-1/2 x 2 size) or ANSI/ASME Class 150 flanged connections rated to 285 psig. The F70PR uses a modulating, flowing pilot valve (Model F100) to control the main valve. System pressure is routed from below the main valve seat through the pilot valve and to the dome cavity of the main valve. At the designated set pressure, the pilot valve vents dome pressure proportionally to demand at set pressure, and allows the piston to lift. Once system pressure is relieved, the pilot valve closes, which allows the dome to repressurize and main valve piston to close. When closed, dome pressure acts on a net positive differential area between the top and bottom of the piston assembly, creating a downward force to seat the piston. The pilot valve is leak-tight to approximately 95% of set pressure.

Use Cases

Overpressure protection in industrial applications
Cryogenic applications
Applications requiring compliance with ASME Section XIII for gas/vapor service

Capabilities

Reliable overpressure protection
Zero leakage due to plastic seat design
Adjustable blowdown capabilities
Capacity-certified by the National Board
Suitable for various material configurations

Flow Safe, Inc. Flow Safe is a manufacturer of high-quality pressure relief valves and accessories, crucial for safe hydrogen handling in the energy transition. It operates in New York and Texas. Flow Safe supports the hydrogen economy by ensuring safe, efficient hydrogen transport and storage.

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