Air bleeding device

An air bleeding device for use in a liquid supply system, especially but not exclusively the fuel supply system of a fuel injection engine, said device comprising a closed tank having a liquid inlet opening for connection to a liquid inlet pipe, an upper air bleed valve, and a lower liquid outlet valve, each said valve comprising a valve opening and a valve member movable to open and close the valve opening, a float controlling movement of both said valve members, and a follower lever member which is pivotably mounted at one end on the tank and bears adjacent its free end on an upper portion of the float;

• in which there is provided intermediate upper and lower ends of the float a pivot member which extends transversely of the tank and pivotally anchors the float therein;
• and the free end portion of said follower lever member bears freely and slideably on the upper end of the float to permit a differential movement therebetween upon pivotting of the float;
• and in which, in use, if the liquid in the tank falls below a first predetermined level due to the entry of air into the tank, the air bleed valve opens due to downward movement of the float and of the follower member, and, if the liquid falls below a second and lower predetermined level, the float, under the weight of the follower member, effects closure of the liquid outlet valve to prevent further lowering of the liquid level and the passage of air through the liquid outlet valve opening.