Walbro Corporation

Randall P Izydorek

Charles H Tuckey

Kevin L Williams

A control device for bypassing intake air around a closed throttle valve of an operating engine while it is idling. The device has a main flow control valve controlling bypass air flow in the bypass air passageway of the device and movable to closed and open positions by a diaphragm actuated by engine intake vacuum controlled by a pilot valve actuated by a solenoid. The main valve, pilot valve and plunger of the solenoid are all movably received on and supported by a stationary slide rod which preferably extends into the coil of the solenoid and is supported adjacent only one end in a cantilever fashion. The main valve includes a main valve body with piston head movable with a flow clearance in and out of an air passage bore of the air outlet side of the bypass air passageway. An annular main valve seat is located at the open upstream end of the bore through which the piston head moves in its axial travel between fully open and closed positions of the main valve. The main valve also includes a flexible valve disc upstream of the valve body which is engageable with the main valve seat to fully close the same. The valve disc is controllably peeled off the main valve seat by a wedge shaped face of the piston head during initial opening travel of the main valve. The piston is also peripherally shaped to cooperate with the air passage bore and main valve seat to controllable vary the flow controlling cross sectional area of the bypass passageway and hence the bypass air flow rate as a function of incremental axial travel of the main valve along the slide rod.

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Snover, MI, United States of America

Randall P Izydorek