Pressure Relief Device – F70U Unloaded valve

Flow Safe, Inc.

Engineered for continuous, repeated cycling at full pressure and across a wide temperature range (-65 to 400°F)
Uses an elastomeric O-ring main seat to ensure "bubble-tight" seating and re-seating.
Features dynamic piston seals and wear rings that provide smooth operation and prevent leakage from the dome cavity to the discharge..
Can be operated locally or remotely using electric or pneumatic controls, often integrated with 2-way or 3-way solenoid valves.
Typically constructed with a carbon steel body and corrosion-resistant trim for longevity in harsh environments

The FLOW SAFE F70U Series unloader valve provides a means to control flow for a variety of process flow applications, such as compressor and blower unloading. It is designed to be repeatedly cycled at full pressure throughout its range of rated temperatures. System pressure is routed from below the valve through the pickup tube to the dome cavity above the main piston. This dome pressure, acting on a differential area between the top and bottom of the piston, creates a downward force on the seat to keep it closed. Control valves in the dome tubing usually include an automatic (electric or pneumatic) valve to exhaust dome pressure and thus open the main valve, and a manual valve to adjust the rate of dome loading (pressurization) desired for the closing cycle. The F70U uses an elastomeric O-ring as the main valve seat to achieve leak-tight seating. A dynamic piston seal guards against leakage from the dome cavity to the discharge. Wear rings on the piston help to provide smooth and consistent operation, particularly for high-cycle conditions. 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.

Use Cases

Compressor & Blower Unloading:
Batch Processing:
Emergency Shutdown (ESD)
Load Reduction

Capabilities

Connection Sizes 1.5” x 2” up to 12” x 16”
Set Pressure Range 5 to 285 psig (0.35 to 19.6 barg)
Temperature Range -65°F to 400°F (-54°C to 204°C)
Orifice Area 1.77 to 111.87 in²

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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