Respiratory device

A respiratory device 20 for providing a positive end expiratory pressure (PEEP) for a user, comprising a conduit 24 connecting an inlet 21, for receiving respiratory gases, and an outlet 22, through which respiratory gases can exit the device. A blocking member 24 is arranged within the conduit, with a biasing means 27 arranged to bias the blocking member into a blocking position, preventing gases flowing through the conduit. Wherein the blocking member is arranged to translate away from the blocking position when an air pressure force acting on the blocking member overcomes the biasing force, thereby permitting respiratory gases to flow through and exit the device. Stabilisation means serve to fix the rotation and/or tilt angle of the blocking member. The stabilisation means may comprise a protrusion 25 on the blocking member, the protrusion extending into a groove 26 in a wall of the conduit. Alternatively, or in addition, the stabilisation means may comprise a spigot 27 protruding from the blocking member, the spigot being received within a spigot tube 28. The respiratory device is particularly suited for use as a PEEP valve or lung trainer.