Exhaust gas control valve

Claim 1

An exhaust gas controlling system for an internal combustion engine comprising: a valve housing having an inlet port provided therein adapted to be connected to an exhaust pipe of said engine and an outlet port therein adapted to be connected to a suction pipe of said engine; valve means including a valve body and a valve seat mounted in said valve housing for communicating said inlet port with said outlet port therethrough when opened; a diaphragm dividing said housing into first and second chambers, said first chamber being adapted for connection to the atmosphere and said second chamber being adapted for connection to said suction pipe of said engine; a first shaft fixed at one end thereof to said valve body and at the other end to said diaphragm for axial movement with said diaphragm whereby a force is applied to said valve means to cause said valve means to open when negative pressure is applied to said second chamber from said suction pipe of said engine; and said diaphragm and shaft are axially displaced in response thereto, the axial displacement of said shaft determining the amount of exhaust gases passing through said housing; and means responsive to changes in ambient temperature for decreasing the axial range of movement of said diaphragm and said first shaft as the ambient temperature decreases in order to decrease the amount of exhausted gas flowing through said valve means.