Upgrader variable pressure regulator

Claim 1

An air-fuel metering regulator for adjusting the flow of fuel to, for example, an internal combustion engine operating under idling, cruising and accelerating power conditions, comprising: a. a housing; b. a fuel diaphragm within said housing, said fuel diaphragm and said housing providing a fuel chamber within said housing, and said fuel chamber is provided with a fuel supply inlet and a fuel supply outlet; c. a vacuum diaphragm within said housing, said vacuum diaphragm and said housing providing a vacuum chamber within said housing, said vacuum chamber provided with an opening to which a supply of engine vacuum pressure is connectable; and d. valve means associated with said fuel chamber for controlling the rate of flow of fuel into said fuel supply inlet into said fuel chamber to said fuel supply outlet, said valve means being actuated by reciprocations of said fuel diaphragm, and said fuel diaphragm is reciprocated by motion of said vacuum diaphragm, said motion of said vacuum diaphragm produced by the supply of engine vacuum pressure connected to said fuel vacuum chamber, said valve means comprising in part maximum flow adjustment means in cooperation with said valve means and externally mounted on said housing for adjusting the maximum flow rate of fuel through said valve means, said valve means further comprising in part minimum flow adjustment means in cooperation with said valve means and externally mounted on said housing for adjusting the minimum flow rate of fuel through said valve means, said valve means being a needle valve having an inner valving needle, said valving needle being urged into contact at its end portion with said fuel diaphragm, and reciprocations of said fuel diaphragm within said fuel chamber producing a corresponding reciprocation in said valving needle and a variation of fuel flow from said inlet through said needle valve into said fuel chamber.