Carburetor with an altitude compensator

Claim 1

An internal combustion engine carburetor comprising, in combination, means defining an induction passage; means defining a main fuel delivery passage with a main air bleed; means defining a slow fuel delivery passage with a slow air bleed; and means defining an auxiliary air delivery circuit including an altitude compensating apparatus having an aneroid bellows deformable in dependence on the ambient atmospheric pressure, conduit means for passing air to the main and slow fuel delivery passage having two conduits one for each fuel passage, valve means for controlling the volume of air through said conduit means in accordance with the deformation of said aneroid bellows, said valve means having two valve housings and two valve members, one for each of said conduits, respectively accommodated in the two valve housings, and means bypassing said valve means to deliver a predetermined amount of air into said conduit means, said bypassing means including restricted passage means for constant fluid connection of said conduit means to the atmosphere across said valve means.