A shut-off valve for controlling flow of a pressurized gas including a restrictor, which at its second axial end extends in a radial direction of a passage to essentially cover a mouth of the passage. Further the restrictor includes a longitudinally extending guiding member for guiding a gas flow between a gas inlet and a gas outlet when a sealing member is in a second position. The guiding member is arranged to allow gas to leave the passage in a radial direction of the restrictor.