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A large commercial aircraft engine manufacturer needed a fire safety relief valve to automatically drain hydraulic fluid from their gearbox should the temperature in the gearbox approach the flash point of the hydraulic fluid. Of course, the valve needs to remain leak-tight during normal use.
The biggest hurdle facing our customer was that there were no commercially available mechanical thermal valves able to operate in the extreme temperature range required by the engine back-up generator ( -65°F to 450°F.)
Despite multiple safety checks and sensors, there have historically been occurrences when oil-filled gearboxes have overheated and caused fires.