Patent ID: 11932411
Assignee: PRATT & WHITNEY CANADA CORP.
Field: Engines, pumps, turbines (Mechanical engineering)
Classification: CPC B  F | IPC B

Claim 7:
8. An oil tank of an aircraft engine, comprising:
a filler tube received through a wall of the oil tank such that an upper end of the filler tube is accessible from outside of the oil tank and a bottom portion of the filler tube is disposed inside the oil tank, the filler tube defining apertures in the bottom portion;
a valve received at least in part in the bottom portion of the filler tube, the valve being operable between an open position in which the valve hydraulically connects a portion of the filler tube above the apertures to the inside of the oil tank, and a closed position in which the valve blocks the filler tube above the apertures and thereby hydraulically disconnects the portion of the filler tube above the apertures from the inside of the oil tank; and
a float disposed inside the oil tank above the valve and operatively connected to the valve to move the valve from the open position to the closed position when oil inside the oil tank rises to a threshold oil level defined by the closed position of the valve, the valve including a piston translationally received in the filer tube and being movable independently from the float for moving the valve from the open position to the closed position when pressure in the oil tank is greater than pressure in the filler tube and when oil inside the oil tanks is lower than the threshold oil level.