FUEL TANK EMISSION CONTROL SYSTEM COMPRISING AN MECHANICALLY ACTUATED ISOLATION VALVE

摘要

This invention discloses a mechanical operating shut-off valve (20). Such a valve 20, and an associated method, is, in the first part (24) in fluid communication with the first port (44); The second part (22) in fluid communication with the second port 46 with; The third part (38) and fluid and the third port (48) communicating, as a diaphragm (52) disposed in the valve 20, the diaphragm 52, the first port (44) in response to a pressure differential across the a second port 46, the diaphragm 52 and for closing the normally open internal path to occlude fluid communication between; And a flow sensitive pressure diaphragm device for controlling the pressure difference across the 52 (65). When the normally open internal path is closed, and the third part 38, the fluid flows up from the second component 22. In the exemplary embodiment, the shut-off valve 20 and the method of the present invention is suitable for use in a fuel tank emission control system.