Abstract: A valve comprising an inlet and an outlet, the valve having a valve element moveable between a first equilibrium position and a second open position, wherein when the valve element is in the first position, the inlet and the outlet are not in flow communication and when the valve element is in the second position the inlet and the outlet are in flow communication, and wherein the valve element is moveable between the first position and the second position in response to the pressure at the inlet and the outlet.

Abstract: A liquid dispenser for dispensing liquid from a container, includes an intake pipe to receive liquid from the container, an outlet to dispense liquid, a pressure supply mechanism to supply pressurized fluid to the container at a first pressure, and a dispensing mechanism. The dispensing mechanism is operable to dispense liquid from the container by reducing the pressure in the container to a second pressure, connecting the intake pipe to the outlet to dispense fluid from the container, and subsequently increasing the pressure in the container to the first pressure.

Abstract: A valve comprising an inlet and an outlet, the valve having a valve element moveable between a first equilibrium position and a second open position, wherein when the valve element is in the first position, the inlet and the outlet are not in flow communication and when the valve element is in the second position the inlet and the outlet are in flow communication, and wherein the valve element is moveable between the first position and the second position in response to the pressure at the inlet and the outlet.