FUEL TANK EMISSION CONTROL SYSTEM COMPRISING AN MECHANICALLY ACTUATED ISOLATION VALVE

摘要

A mechanically actuated isolation valve (20) is disclosed. Such valves (20) and associated methods include a first port (44) in fluid communication with a first component (24); a second port (46) in fluid communication with a second component (22); a third port (48) in fluid communication with a third component (38); a diaphragm (52) disposed within the valve (20) for closing a normally open internal pathway to occlude fluid communication between the first port (44) and the second port (46) in response to a pressure differential across the diaphragm (52); and a flow sensitive pressure device (65) for controlling the pressure differential across the diaphragm (52). Fluid flows from the second component (22) to the third component (38) upon closing of the normally open internal pathway. In an exemplary embodiment, isolation valves (20) and methods of the invention are adapted for use in fuel tank emission control systems.