| 摘要 |
<p>PROBLEM TO BE SOLVED: To provide a piloted fuel tank vapor isolation valve.SOLUTION: A vapor isolation valve 10 includes a first chamber 16 in fluid communication with a fuel tank 12, and a second chamber 18 disposed with respect to the first chamber 16. A diaphragm 24 is disposed between the first chamber 16 and the second chamber 18, has an orifice allowing fluid communication between the two chambers, and is moveable between a diaphragm open position and a diaphragm closed position. A third chamber 20 is disposed adjacently to the first chamber 16 relative to the diaphragm 24, and is in fluid communication with an exit passage 14. The diaphragm open position allows fluid communication between the first chamber 16 and the third chamber 20, and the diaphragm closed position substantially restricts fluid communication between the first and third chambers. A pilot valve 30 is disposed between the second chamber 18 and the third chamber 20, and is selectively moveable between a pilot open position configured to allow fluid communication between the second and third chambers and a pilot closed position configured to block fluid communication between the second and third chambers.</p> |
