Turbine including seal air valve system

It is described a turbine (1), comprising: a rotor (2); a fluid bearing (31) for rotatably supporting the rotor; an air supply conduit system (45, 47) for supplying air towards the fluid bearing; a discharge conduit system (57, 59, 61, 63) for discharging a portion of the supplied air; a control system (67, 71) arranged to change an amount of air discharging through the discharge conduit system based on a running condition of the turbine.