Abstract: An improved carburetor uses a butterfly air valve having a controlled air pressure difference across it and positions a tilt valve, proportionally to feed the liquid fuel with a predetermined pressure difference across the fuel valve and the metered fuel is picked up by air and fed into the main air stream below the throttle place through a small air passage.

Abstract: A system for controlling the flow of agricultural ammonia from a tank to applicator apparatus transported by a land vehicle over the ground includes a ground speed sensor that generates a speed signal representing the speed of the land vehicle over the ground, an ammonia flow reader that generates a flow rate signal representing the flow of ammonia through the system, a throttling device having means for varying the flow of ammonia through the system, and i)computing means for sending a throttling signal to the throttling device, the computing means being responsive to the speed signal and flow rate signal to cause the throttling device to throttle the flow of ammonia through the system.

Abstract: This invention has an inlet for either gaseous or liquified gases (LP gas requiring a vaporizer within the system) with the proper passages from the inlet to a back seated fuel valve which is opened by a pressure differential (vacuum from the idle system) across a diaphragm engaging a lever which moves a sealed actuating pin inward to open the fuel valve allowing gaseous fuels to move to the outlet through a proper confining passage. Placed between the outlet and the vacuum chamber of the fuel valve diaphragm is a chamber divided by a free floating diaphragm providing two chambers, one chamber is either balanced for air cleaner resistance or vented to the atmosphere, the other chamber having a free passage to the outlet and a passage in the center of the chamber, having communication with the vacuum side of the fuel valve diaphragm, which is throttled by the floating diaphragm diluting the idle vacuum signal to position the fuel valve.