Pressure Relief Device – Spring Orient-F88

Flow Safe, Inc.

Uses a spindle seal with the same diameter as the seat, ensuring the valve's set pressure remains unaffected by backpressure up to the body's pressure rating.
ASME Section VIII certified for both gas and liquid service, making it ideal for systems where fluid phases vary or are unpredictable.
Exhibits "pop" action for rapid relief in gas service and initial modulating action for smooth, stable relief in liquid service.
Features plastic seats and a spring-energized Teflon V-seal to ensure zero leakage up to 96% of the set pressure.
standard construction includes a 316/316L stainless steel trim for superior durability in harsh environments

The Flow Safe F84L and F88 Series liquid relief valves are designed to provide customers with a stable, smooth-flowing relief valve with substantial capacity. Below the set point, pressure acting upon the valve spindle/seat surface generates a lifting force, F = P x A. This opening force is opposed by the spring closing force. At set point, as the seat starts to lift off the nozzle, an additional force is created in the ‘huddling chamber’ to boost the effective force due to pressure. At approximately 7.5% above set pressure, the combined upward forces cause the spindle to pop open to full lift. The larger F84L sizes achieve stability through the use of a process-pressurized drag seal on the spin dle. This O-ring helps dampen the movement of the spindle to prevent flutter or chatter. F88’s use a spring-energized Teflon seal. In all sizes, the spindle seal diameter is the same as the seat diameter, which makes the valves balanced against backpressure without the use of bellows. After the valve fully opens, blowdown is typically a fixed 20% on the larger sizes, and 30% for the F84L-2. At very low flow rates, the F84L can modulate open to relieve the upset and softly reclose at up to the nominal blowdown value. Strong coefficients of discharge Kd allow for smaller valves to be used, lending additional value by reducing the user’s capital costs. For water service over 140 °F, a lift lever can be provided except on the F84L-2.

Use Cases

Mixed-Phase Applications:
Closed-Loop Systems
Rotating Equipment
Extreme Temperatures
Hydrogen production electrolyzer manifolds
High-pressure hydrogen gas storage banks
Hydrogen refueling station dispensers
Liquid hydrogen thermal expansion relief
Compressor suction and discharge protection
Hydrogen fuel cell assembly safeguarding
Pressure vessel overpressure protection (Gas and Liquid)
Skid-mounted hydrogen purification systems
Cryogenic liquid hydrogen storage tanks
High-pressure nitrogen or helium purging systems

Capabilities

Set Pressure Range 50 to 8,382 psig (3.45 to 578 barg)
Temperature Range -423°F to 400°F (-252°C to 204°C)
Connection Sizes 1/2” to 2” inlet; threaded or flanged
Orifice Sizes -2, -3, -4, -8, -G, and -J (0.015 to 1.69 in²)
Blowdown Fixed at 10%–30% (non-adjustable)

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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