Patent ID: 7086636

Claim:
A vehicle gaseous fluid metering device comprising: a housing, adapted for routing of gas from an input passage to an output passage; a valve assembly positioned inside said housing for selectively moving gas from said input passage to said output passage, said valve assembly including at least one valve seat acting as an opening between said input passage and said output passage, and at least one valve member operative with said valve seat and acting as a moveable barrier between said input passage and said output passage, wherein said valve member moves between a closed position and an open position; a valve shaft connected to said at least one valve member, said valve shaft is operable for moving said at least one valve member in response to rotation of said valve shaft; an engagement member extending from said valve shaft, wherein said engagement member is a pin extending from the valve shaft and said ramp portion is a first slot formed in a wall of the valve housing, said first slot is progressively angled from a first angle at a valve seat breaking end of said first slot to a second angle at a valve open end of said first slot, and said first angle is from about 0 to about 10 degrees and a second angle is from about 20 to about 30 degrees; a first ramped surface formed inside of said housing, wherein said member engages said first ramped surface during rotation of said valve shaft for moving said shaft in an axial direction in response to rotation of said valve shaft; and an actuator operable for rotating said valve shaft causing corresponding axial movement of said at least one valve member.