Fluidic level control systems

This invention relates to a method and system to control the level of a liquid in a pressurised vessel or at least in a reservoir in which a pressure difference exists between the fluid above the liquid whose level is being controlled and an outflow of the liquid from the reservoir. This invention finds particular application in a fluid separation system to separate immiscible fluids of different density. The invention also relates to an improved fluidic valve. A system for separating a liquid and a gas including a separation vessel () with an inlet () for a gas/liquid mixture. Outlets () for the fluids are disposed at different heights in the vessel. The outlets are controlled by turn-up vortex amplifiers (fluidic valves TuVAs) that include a supply port (), a control port () and an outlet port (). The control port is supplied from the vessel at an intermediate level between the outlets, so that a change of flow in the control port alters resistence to flow through the valve.