Pressure Relief Device – Spring Orient F84L & F88

Flow Safe, Inc.

Balanced against the effects of backpres sure without bellows
High backpressure (99%) capability with no effect on setpoint
Spindle seal orientation prevents media back-flow to inle
Strong discharge coefficients provide for large flow capabilities
Certified for liquid service per ASME Sec tion XIII; ‘CE’ Mark available
F88 series also certified per ASME Section XIII for gas service
In the larger sizes, a spindle (disk) seal is proportionally loaded to system pressure or spring-energized to provide smooth open ing and reseat

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

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

Capabilities

Stable under all load conditions and fully open by 10% overpressure per ASME
Repeatable leak-tight seating
Fixed blowdown of approx. 20% at most pressure ranges, and modulating action at low-flow conditions
Standard 316/316L SS trim for superior cor rosion resistance
30 to 24,277 psig (2.1 to 1674 barg) pres sure range
-65 to 500 °F (-54 to 260 °C) service tem perature range

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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