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A valve assembly (20) for an aircraft water supply system. The valve assembly (20) comprises a valve member (40), an electrical motor (64), and a mechanical returning mechanism (80). When electrical power is provided, the motor (64) can be controlled to move the valve member (40) from a first positi

A valve assembly (20) for an aircraft water supply system. The valve assembly (20) comprises a valve member (40), an electrical motor (64), and a mechanical returning mechanism (80). When electrical power is provided, the motor (64) can be controlled to move the valve member (40) from a first position and to a second position. The mechanism (80) is operably connected to the valve member (40) and mechanically biases it towards the first position. If a power loss occurs when the valve member (40) is in the second position, the returning mechanism (80) non-electrically (e.g., mechanically) returns the valve member (40) to the first position.

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1. A valve assembly comprising: a valve member;an electrical motor which, when electrical power is provided, can be controlled to move the valve member from a first position and to a second position; anda returning mechanism operably connected to the valve member and rotating therewith when the elec

1. A valve assembly comprising: a valve member;an electrical motor which, when electrical power is provided, can be controlled to move the valve member from a first position and to a second position; anda returning mechanism operably connected to the valve member and rotating therewith when the electric motor is controlled to move the valve member from the first position to the second position, the mechanism mechanically biasing the valve member towards the first position when it is the second position;wherein, when the valve member is in the second position and the motor loses electrical power, the returning mechanism non-electrically returns the valve member to the first position; andwherein the valve member may be manually moved between the first position and the second position, and wherein the electrical operation overrides manual operation when electrical power being supplied. 2. A valve assembly as set forth in claim 1, further comprising an electrical brake which, when electrical power is provided, locks the valve member in the second position. 3. A valve assembly as set forth in claim 1, wherein the valve member includes a ball portion. 4. A valve assembly as set forth in claim 3, wherein the electrical motor drives the valve member approximately 90° to move it from the first position to the second position. 5. A valve assembly as set forth in claim 1, wherein the returning mechanism comprises a spring. 6. A valve assembly as set forth in claim 5, wherein the returning mechanism comprises a torque member which winds the spring when the electrical motor moves the valve member from the first position to the second position. 7. A valve assembly as set forth in claim 1, wherein the first position is an OPENED position and the second position is a CLOSED position. 8. A valve assembly as set forth in claim 1, wherein the first position is a CLOSED position and the second position is an OPENED position. 9. A valve assembly comprising: a valve member;an electrical motor which, when electrical power is provided, can be controlled to move the valve member from a first position and to a second position; anda returning mechanism operably connected to the valve member and rotating therewith when the electric motor is controlled to move the valve member from the first position to the second position, the mechanism mechanically biasing the valve member towards the first position when it is the second position;wherein, when the valve member is in the second position and the motor loses electrical power, the returning mechanism non-electrically returns the valve member to the first position;wherein the returning mechanism comprises a spring, and a torque member which winds the spring when the electrical motor moves the valve member from the first position to the second position; andwherein the valve member may be manually moved between the first position and the second position, but electrical operation overrides manual operation when electrical power is being supplied. 10. A valve assembly as set forth in claim 9, further comprising an electrical brake which, when electrical power is provided, locks the valve member in the second position. 11. A valve assembly as set forth in claim 10, wherein the first position is one of an OPENED position and a CLOSED position, and the second position is the other of the OPENED position and the CLOSED position. 12. A valve assembly as set forth in claim 9, wherein the first position is one of an OPENED position and a CLOSED position, and the second position is the other of the OPENED position and the CLOSED position. 13. A valve assembly as set forth in claim 12, wherein the valve member includes a ball portion and wherein the electrical motor drives the valve member approximately 90° to move it from the first position to the second position. 14. A valve assembly as set forth in claim 11, wherein the valve member includes a ball portion and wherein the electrical motor drives the valve member approximately 90° to move it from the first position to the second position. 15. A valve assembly as set forth in claim 10, wherein the valve member includes a ball portion and wherein the electrical motor drives the valve member approximately 90° to move it from the first position to the second position. 16. A valve assembly as set forth in claim 9, wherein the valve member includes a ball portion and wherein the electrical motor drives the valve member approximately 90° to move it from the first position to the second position. 17. An aircraft water supply system comprising on-board water-using devices, a water tank, plumbing lines, and the valve assembly set forth in claim 1, and wherein the plumbing lines supply water from the water tank to the water-using devices. 18. A valve assembly comprising: a valve member;an electrical motor which, when electrical power is provided, can be controlled to move the valve member from a first position and to a second position; anda returning mechanism operably connected to the valve member and rotating therewith when the electric motor is controlled to move the valve member from the first position to the second position, the mechanism mechanically biasing the valve member towards the first position when it is the second position;wherein, when the valve member is in the second position and the motor loses electrical power, the returning mechanism non-electrically returns the valve member to the first position;wherein the valve member comprises:a ball portion that moves approximately 90° from the first position to the second position;a crown portion extending upwardly from the ball portion and operatively connected to gears of the electric motor; anda stem extending downwardly from the ball portion and interacting with the returning mechanism.