A pressure-operated check valve assembly for a fuel tank inerting system includes a valve body having a fluid flow path between an inlet and an outlet, a plurality of poppets arranged in series in the fluid flow path, and an actuator in the valve body that is movable in response to fluid pressure in the valve body to actuate open the poppets or enable the poppets to close. Each poppet may be movable in the flow path independent of the other poppets to thereby provide independent and redundant functionality. The poppets may be normally biased toward closed, and activation of the actuator in response to fluid pressure being greater than a predefined threshold level may cause the actuator to overcome the biasing force of the poppets to urge the poppets to open. A flow restrictor downstream of the poppets may facilitate buildup of upstream pressure to enable low cracking pressure.
PRESSURE-OPERATED CHECK VALVE
2020-10-01
Patent
Electronic Resource
English
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