Patent ID: 11959542
Assignee: GE INFRASTRUCTURE TECHNOLOGY LLC
Field: Mechanical elements (Mechanical engineering)
Classification: CPC F | IPC F

Claim 14:
15. The drive system according to claim 14, wherein:
in an atmospheric operation mode, the vacuum pump, the gas check valve and the oil check valve are inoperative, and the oil regulating valve is open, allowing oil and gas to flow freely between the first oil receptacle and the second oil receptacle; and
in a vacuum operation mode, the vacuum pump is operative to apply the pressure differential, the oil check valve is operative to prevent oil from flowing from the second oil receptacle to the first oil receptacle, the gas check valve is operative to prevent gas from flowing from the second oil receptacle to the first oil receptacle, and the oil regulating valve is operative to maintain a level of oil in the first oil receptacle below a threshold level,
wherein the pressure differential generates a positive pressure in the second oil receptacle and the negative pressure in the first oil receptacle and the transmission casing indirectly through the first oil receptacle and the first oil return line.