A check valve assembly comprising a valve body having a first end and a second end, the valve body extending along an axis from the first end to the second end; a check valve outlet (30) is located between the first and the second end; an actuator port (32) provided in the check valve body at a location axially between the outlet (30) and the second end, for fluid connection, in use, to a pump actuator (22), the valve body further comprising a fluid inlet (25) via which the check valve is, in use, connected to a fluid tank (10), the fluid inlet (25) being provided in the valve body towards the second end, axially between the actuator port (32) and the second end; the assembly further comprising check valve components located in the check valve body configured to control the flow of fluid entering the check valve from the tank via the fluid inlet (25), and leaving the check valve via the outlet, according to the first and second stages of operation, the check valve components comprising a first ball (202) located in the valve body adjacent the first end, and a second ball (204) located in the valve body adjacent the second end, and a check valve spring (206) provided in spring force engagement with the second ball (204), the check valve spring being sized and positioned to bias the second ball towards the second end; wherein a first stage pressure differential between the actuator port (32) and the fluid inlet (25) creates a fluid flow path from the inlet to the actuator port by causing the second ball to press against the bias of the check valve spring to create a flow passage between the second ball and the second end, and causing the first ball to block the flow of fluid to the outlet (30), and wherein removal of the first stage pressure differential causes the check valve spring to return the second ball to its biased position to close the passage from the fluid inlet to the actuator port and to cause the first ball to move to open a fluid passage between the actuator port and the outlet.
CHECK VALVE FOR RAM AIR TURBINE RE-STOW PUMP
RÜCKSCHLAGVENTIL FÜR EINE PUMPE ZUM VERSTAUEN EINER STAUDRUCKTURBINE
CLAPET DE NON-RETOUR POUR POMPE DE RÉTRACTION D'UNE ÉOLIENNE DE SECOURS
16.04.2025
Patent
Elektronische Ressource
Englisch
MODE SELECTION VALVE FOR A RAM AIR TURBINE (RAT) RE-STOW PUMP
Europäisches Patentamt | 2024
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