Title: Flow control valve assembly for exhaust gas recirculation system

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Abstract: Herein disclosed is a flow control valve assembly for use in an exhaust gas recirculation system in which engine exhaust gases are recirculated from the exhaust system to the intake system of an internal combustion engine so as to clean the engine exhaust gases. The flow control valve assembly comprises a first valve interposed between its inlet and outlet ports for regulating its effective area for the exhaust gases. The first valve includes an orifice, a valve seat, a constant-pressure chamber defined inbetween, and a valve member movable between a seated position and an open position. The control valve assembly further comprises diaphragm means for acutating the valve member and including a diaphragm connected to the valve member, a diaphragm chamber having fluid communication with an air source under pressure, and an air bleed hole formed in the diaphragm. The control valve assembly further comprises a second valve including a valve member, which is movable between a seated position and an open position in response to the pressure in the constant-pressure chamber for regulating the effective area of the air bleed hole, so that the amount of air bleed may be controlled by the second valve to maintain the pressure of the exhaust gases in the constant-pressure chamber substantially at the atmospheric level. Thus, the control valve assembly can provide such recirculation of the exhaust gases as is proportional to the amount of the intake mixture.


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