Abstract: For ensuring a quick cut-off of a float controlled valve, there is provided a float having a buoyant body and a receptacle for liquid on the body, a single first tube providing an inlet to and an outlet from the receptacle, and a second tube connected to the first tube at an angle directed towards the interior of the receptacle to permit a portion of the liquid from the valve to flow through the second tube into the receptacle to bias the float downwardly and therefore the valve to its maximum open position, the direction of flow of liquid from the second into the first tube acting to dam any liquid in the receptacle. When the valve approaches its closed position, the flow through the second tube decreases and liquid flows out of the receptacle so removing the bias on the float and allowing the float rapidly to rise and close the valve.

Abstract: A liquid level control valve including a cylinder member formed with a passage between an inlet and an outlet; a piston member slidable within the cylinder member, the piston and cylinder members being movable with respect to each other between a position in which the piston obturates the passage through the cylinder and a position in which the passage is open; a lever arm pivoted about an axis on one of the members and connectable to a float so that it is movable in response to the movement of the float on a body of liquid the level of which is to be controlled; and a linkage pivotally connected between the other member and the lever arm at a position on the lever arm spaced from the first mentioned pivot axis.